ffmpeg.c

        if (s->oformat->flags & AVFMT_RAWPICTURE) {
            /* raw pictures are written as AVPicture structure to
               avoid any copies. We support temorarily the older
               method. */
            AVFrame* old_frame = enc->coded_frame;
            enc->coded_frame = dec->coded_frame; //FIXME/XXX remove this hack
            pkt.data= (uint8_t *)final_picture;
            pkt.size=  sizeof(AVPicture);
            pkt.pts= av_rescale_q(ost->sync_opts, enc->time_base, ost->st->time_base);
            pkt.flags |= PKT_FLAG_KEY;

            write_frame(s, &pkt, ost->st->codec, bitstream_filters[ost->file_index][pkt.stream_index]);
            enc->coded_frame = old_frame;
        } else {
            AVFrame big_picture;

            big_picture= *final_picture;
            /* better than nothing: use input picture interlaced
               settings */
            big_picture.interlaced_frame = in_picture->interlaced_frame;
            if(avcodec_opts[CODEC_TYPE_VIDEO]->flags & (CODEC_FLAG_INTERLACED_DCT|CODEC_FLAG_INTERLACED_ME)){
                if(top_field_first == -1)
                    big_picture.top_field_first = in_picture->top_field_first;
                else
                    big_picture.top_field_first = top_field_first;
            }

            /* handles sameq here. This is not correct because it may
               not be a global option */
            if (same_quality) {
                big_picture.quality = ist->st->quality;
            }else
                big_picture.quality = ost->st->quality;
            if(!me_threshold)
                big_picture.pict_type = 0;
//            big_picture.pts = AV_NOPTS_VALUE;
            big_picture.pts= ost->sync_opts;
//            big_picture.pts= av_rescale(ost->sync_opts, AV_TIME_BASE*(int64_t)enc->time_base.num, enc->time_base.den);
//av_log(NULL, AV_LOG_DEBUG, "%"PRId64" -> encoder\n", ost->sync_opts);
            ret = avcodec_encode_video(enc,
                                       bit_buffer, bit_buffer_size,
                                       &big_picture);
            if (ret < 0) {
                fprintf(stderr, "Video encoding failed\n");
                av_exit(1);
            }

            if(ret>0){
                pkt.data= bit_buffer;
                pkt.size= ret;
                if(enc->coded_frame->pts != AV_NOPTS_VALUE)
                    pkt.pts= av_rescale_q(enc->coded_frame->pts, enc->time_base, ost->st->time_base);
/*av_log(NULL, AV_LOG_DEBUG, "encoder -> %"PRId64"/%"PRId64"\n",
   pkt.pts != AV_NOPTS_VALUE ? av_rescale(pkt.pts, enc->time_base.den, AV_TIME_BASE*(int64_t)enc->time_base.num) : -1,
   pkt.dts != AV_NOPTS_VALUE ? av_rescale(pkt.dts, enc->time_base.den, AV_TIME_BASE*(int64_t)enc->time_base.num) : -1);*/

                if(enc->coded_frame->key_frame)
                    pkt.flags |= PKT_FLAG_KEY;
                write_frame(s, &pkt, ost->st->codec, bitstream_filters[ost->file_index][pkt.stream_index]);
                *frame_size = ret;
                video_size += ret;
                //fprintf(stderr,"\nFrame: %3d size: %5d type: %d",
                //        enc->frame_number-1, ret, enc->pict_type);
                /* if two pass, output log */
                if (ost->logfile && enc->stats_out) {
                    fprintf(ost->logfile, "%s", enc->stats_out);
                }
            }
        }
        ost->sync_opts++;
        ost->frame_number++;
    }
}

static double psnr(double d){
    return -10.0*log(d)/log(10.0);
}

static void do_video_stats(AVFormatContext *os, AVOutputStream *ost,
                           int frame_size)
{
    AVCodecContext *enc;
    int frame_number;
    double ti1, bitrate, avg_bitrate;

    /* this is executed just the first time do_video_stats is called */
    if (!vstats_file) {
        vstats_file = fopen(vstats_filename, "w");
        if (!vstats_file) {
            perror("fopen");
            av_exit(1);
        }
    }

    enc = ost->st->codec;
    if (enc->codec_type == CODEC_TYPE_VIDEO) {
        frame_number = ost->frame_number;
        fprintf(vstats_file, "frame= %5d q= %2.1f ", frame_number, enc->coded_frame->quality/(float)FF_QP2LAMBDA);
        if (enc->flags&CODEC_FLAG_PSNR)
            fprintf(vstats_file, "PSNR= %6.2f ", psnr(enc->coded_frame->error[0]/(enc->width*enc->height*255.0*255.0)));

        fprintf(vstats_file,"f_size= %6d ", frame_size);
        /* compute pts value */
        ti1 = ost->sync_opts * av_q2d(enc->time_base);
        if (ti1 < 0.01)
            ti1 = 0.01;

        bitrate = (frame_size * 8) / av_q2d(enc->time_base) / 1000.0;
        avg_bitrate = (double)(video_size * 8) / ti1 / 1000.0;
        fprintf(vstats_file, "s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s ",
            (double)video_size / 1024, ti1, bitrate, avg_bitrate);
        fprintf(vstats_file,"type= %c\n", av_get_pict_type_char(enc->coded_frame->pict_type));
    }
}

static void print_report(AVFormatContext **output_files,
                         AVOutputStream **ost_table, int nb_ostreams,
                         int is_last_report)
{
    char buf[1024];
    AVOutputStream *ost;
    AVFormatContext *oc;
    int64_t total_size;
    AVCodecContext *enc;
    int frame_number, vid, i;
    double bitrate, ti1, pts;
    static int64_t last_time = -1;
    static int qp_histogram[52];

    if (!is_last_report) {
        int64_t cur_time;
        /* display the report every 0.5 seconds */
        cur_time = av_gettime();
        if (last_time == -1) {
            last_time = cur_time;
            return;
        }
        if ((cur_time - last_time) < 500000)
            return;
        last_time = cur_time;
    }


    oc = output_files[0];

    total_size = url_fsize(oc->pb);
    if(total_size<0) // FIXME improve url_fsize() so it works with non seekable output too
        total_size= url_ftell(oc->pb);

    buf[0] = '\0';
    ti1 = 1e10;
    vid = 0;
    for(i=0;i<nb_ostreams;i++) {
        ost = ost_table[i];
        enc = ost->st->codec;
        if (vid && enc->codec_type == CODEC_TYPE_VIDEO) {
            snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "q=%2.1f ",
                     !ost->st->stream_copy ?
                     enc->coded_frame->quality/(float)FF_QP2LAMBDA : -1);
        }
        if (!vid && enc->codec_type == CODEC_TYPE_VIDEO) {
            float t = (av_gettime()-timer_start) / 1000000.0;

            frame_number = ost->frame_number;
            snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "frame=%5d fps=%3d q=%3.1f ",
                     frame_number, (t>1)?(int)(frame_number/t+0.5) : 0,
                     !ost->st->stream_copy ?
                     enc->coded_frame->quality/(float)FF_QP2LAMBDA : -1);
            if(is_last_report)
                snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "L");
            if(qp_hist){
                int j;
                int qp= lrintf(enc->coded_frame->quality/(float)FF_QP2LAMBDA);
                if(qp>=0 && qp<FF_ARRAY_ELEMS(qp_histogram))
                    qp_histogram[qp]++;
                for(j=0; j<32; j++)
                    snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%X", (int)lrintf(log(qp_histogram[j]+1)/log(2)));
            }
            if (enc->flags&CODEC_FLAG_PSNR){
                int j;
                double error, error_sum=0;
                double scale, scale_sum=0;
                char type[3]= {'Y','U','V'};
                snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "PSNR=");
                for(j=0; j<3; j++){
                    if(is_last_report){
                        error= enc->error[j];
                        scale= enc->width*enc->height*255.0*255.0*frame_number;
                    }else{
                        error= enc->coded_frame->error[j];
                        scale= enc->width*enc->height*255.0*255.0;
                    }
                    if(j) scale/=4;
                    error_sum += error;
                    scale_sum += scale;
                    snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%c:%2.2f ", type[j], psnr(error/scale));
                }
                snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "*:%2.2f ", psnr(error_sum/scale_sum));
            }
            vid = 1;
        }
        /* compute min output value */
        pts = (double)ost->st->pts.val * av_q2d(ost->st->time_base);
        if ((pts < ti1) && (pts > 0))
            ti1 = pts;
    }
    if (ti1 < 0.01)
        ti1 = 0.01;

    if (verbose || is_last_report) {
        bitrate = (double)(total_size * 8) / ti1 / 1000.0;

        snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
            "size=%8.0fkB time=%0.2f bitrate=%6.1fkbits/s",
            (double)total_size / 1024, ti1, bitrate);

        if (verbose > 1)
          snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " dup=%d drop=%d",
                  nb_frames_dup, nb_frames_drop);

        if (verbose >= 0)
            fprintf(stderr, "%s    \r", buf);

        fflush(stderr);
    }

    if (is_last_report && verbose >= 0){
        int64_t raw= audio_size + video_size + extra_size;
        fprintf(stderr, "\n");
        fprintf(stderr, "video:%1.0fkB audio:%1.0fkB global headers:%1.0fkB muxing overhead %f%%\n",
                video_size/1024.0,
                audio_size/1024.0,
                extra_size/1024.0,
                100.0*(total_size - raw)/raw
        );
    }
}

/* pkt = NULL means EOF (needed to flush decoder buffers) */
static int output_packet(AVInputStream *ist, int ist_index,
                         AVOutputStream **ost_table, int nb_ostreams,
                         const AVPacket *pkt)
{
    AVFormatContext *os;
    AVOutputStream *ost;
    int ret, i;
    uint8_t *data_buf;
    int data_size, got_picture;
    AVFrame picture;
    void *buffer_to_free;
    static unsigned int samples_size= 0;
    AVSubtitle subtitle, *subtitle_to_free;
    int got_subtitle;
    AVPacket avpkt;

    if(ist->next_pts == AV_NOPTS_VALUE)
        ist->next_pts= ist->pts;

    if (pkt == NULL) {
        /* EOF handling */
        av_init_packet(&avpkt);
        avpkt.data = NULL;
        avpkt.size = 0;
        goto handle_eof;
    } else {
        avpkt = *pkt;
    }

    if(pkt->dts != AV_NOPTS_VALUE)
        ist->next_pts = ist->pts = av_rescale_q(pkt->dts, ist->st->time_base, AV_TIME_BASE_Q);

    //while we have more to decode or while the decoder did output something on EOF
    while (avpkt.size > 0 || (!pkt && ist->next_pts != ist->pts)) {
    handle_eof:
        ist->pts= ist->next_pts;

        if(avpkt.size && avpkt.size != pkt->size && verbose>0)
            fprintf(stderr, "Multiple frames in a packet from stream %d\n", pkt->stream_index);

        /* decode the packet if needed */
        data_buf = NULL; /* fail safe */
        data_size = 0;
        subtitle_to_free = NULL;
        if (ist->decoding_needed) {
            switch(ist->st->codec->codec_type) {
            case CODEC_TYPE_AUDIO:{
                if(pkt && samples_size < FFMAX(pkt->size*sizeof(*samples), AVCODEC_MAX_AUDIO_FRAME_SIZE)) {
                    samples_size = FFMAX(pkt->size*sizeof(*samples), AVCODEC_MAX_AUDIO_FRAME_SIZE);
                    av_free(samples);
                    samples= av_malloc(samples_size);
                }
                data_size= samples_size;
                    /* XXX: could avoid copy if PCM 16 bits with same
                       endianness as CPU */
                ret = avcodec_decode_audio3(ist->st->codec, samples, &data_size,
                                            &avpkt);
                if (ret < 0)
                    goto fail_decode;
                avpkt.data += ret;
                avpkt.size -= ret;
                /* Some bug in mpeg audio decoder gives */
                /* data_size < 0, it seems they are overflows */
                if (data_size <= 0) {
                    /* no audio frame */
                    continue;
                }
                data_buf = (uint8_t *)samples;
                ist->next_pts += ((int64_t)AV_TIME_BASE/2 * data_size) /
                    (ist->st->codec->sample_rate * ist->st->codec->channels);
                break;}
            case CODEC_TYPE_VIDEO:
                    data_size = (ist->st->codec->width * ist->st->codec->height * 3) / 2;
                    /* XXX: allocate picture correctly */
                    avcodec_get_frame_defaults(&picture);

                    ret = avcodec_decode_video2(ist->st->codec,
                                                &picture, &got_picture, &avpkt);
                    ist->st->quality= picture.quality;
                    if (ret < 0)
                        goto fail_decode;
                    if (!got_picture) {
                        /* no picture yet */
                        goto discard_packet;
                    }
                    if (ist->st->codec->time_base.num != 0) {
                        int ticks= ist->st->parser ? ist->st->parser->repeat_pict+1 : ist->st->codec->ticks_per_frame;
                        ist->next_pts += ((int64_t)AV_TIME_BASE *
                                          ist->st->codec->time_base.num * ticks) /
                            ist->st->codec->time_base.den;
                    }
                    avpkt.size = 0;
                    break;
            case CODEC_TYPE_SUBTITLE:
                ret = avcodec_decode_subtitle2(ist->st->codec,
                                               &subtitle, &got_subtitle, &avpkt);
                if (ret < 0)
                    goto fail_decode;
                if (!got_subtitle) {
                    goto discard_packet;
                }
                subtitle_to_free = &subtitle;
                avpkt.size = 0;
                break;
            default:
                goto fail_decode;
            }
        } else {
            switch(ist->st->codec->codec_type) {
            case CODEC_TYPE_AUDIO:
                ist->next_pts += ((int64_t)AV_TIME_BASE * ist->st->codec->frame_size) /
                    ist->st->codec->sample_rate;
                break;
            case CODEC_TYPE_VIDEO:
                if (ist->st->codec->time_base.num != 0) {
                    int ticks= ist->st->parser ? ist->st->parser->repeat_pict+1 : ist->st->codec->ticks_per_frame;
                    ist->next_pts += ((int64_t)AV_TIME_BASE *
                                      ist->st->codec->time_base.num * ticks) /
                        ist->st->codec->time_base.den;
                }
                break;
            }
            data_buf = avpkt.data;
            data_size = avpkt.size;
            ret = avpkt.size;
            avpkt.size = 0;
        }

        buffer_to_free = NULL;
        if (ist->st->codec->codec_type == CODEC_TYPE_VIDEO) {
            pre_process_video_frame(ist, (AVPicture *)&picture,
                                    &buffer_to_free);
        }

        // preprocess audio (volume)
        if (ist->st->codec->codec_type == CODEC_TYPE_AUDIO) {
            if (audio_volume != 256) {
                short *volp;
                volp = samples;
                for(i=0;i<(data_size / sizeof(short));i++) {
                    int v = ((*volp) * audio_volume + 128) >> 8;
                    if (v < -32768) v = -32768;
                    if (v >  32767) v = 32767;
                    *volp++ = v;
                }
            }
        }

        /* frame rate emulation */
        if (rate_emu) {
            int64_t pts = av_rescale(ist->pts, 1000000, AV_TIME_BASE);
            int64_t now = av_gettime() - ist->start;
            if (pts > now)
                usleep(pts - now);
        }

        /* if output time reached then transcode raw format,
           encode packets and output them */
        if (start_time == 0 || ist->pts >= start_time)
            for(i=0;i<nb_ostreams;i++) {
                int frame_size;

                ost = ost_table[i];
                if (ost->source_index == ist_index) {
                    os = output_files[ost->file_index];

                    /* set the input output pts pairs */
                    //ost->sync_ipts = (double)(ist->pts + input_files_ts_offset[ist->file_index] - start_time)/ AV_TIME_BASE;

                    if (ost->encoding_needed) {
                        switch(ost->st->codec->codec_type) {
                        case CODEC_TYPE_AUDIO:
                            do_audio_out(os, ost, ist, data_buf, data_size);
                            break;
                        case CODEC_TYPE_VIDEO:
                            do_video_out(os, ost, ist, &picture, &frame_size);
                            if (vstats_filename && frame_size)
                                do_video_stats(os, ost, frame_size);
                            break;
                        case CODEC_TYPE_SUBTITLE:
                            do_subtitle_out(os, ost, ist, &subtitle,
                                            pkt->pts);
                            break;
                        default:
                            abort();
                        }
                    } else {
                        AVFrame avframe; //FIXME/XXX remove this
                        AVPacket opkt;
                        int64_t ost_tb_start_time= av_rescale_q(start_time, AV_TIME_BASE_Q, ost->st->time_base);

                        av_init_packet(&opkt);

                        if ((!ost->frame_number && !(pkt->flags & PKT_FLAG_KEY)) && !copy_initial_nonkeyframes)
                            continue;

                        /* no reencoding needed : output the packet directly */
                        /* force the input stream PTS */

                        avcodec_get_frame_defaults(&avframe);
                        ost->st->codec->coded_frame= &avframe;
                        avframe.key_frame = pkt->flags & PKT_FLAG_KEY;

                        if(ost->st->codec->codec_type == CODEC_TYPE_AUDIO)
                            audio_size += data_size;
                        else if (ost->st->codec->codec_type == CODEC_TYPE_VIDEO) {
                            video_size += data_size;
                            ost->sync_opts++;
                        }

                        opkt.stream_index= ost->index;
                        if(pkt->pts != AV_NOPTS_VALUE)
                            opkt.pts= av_rescale_q(pkt->pts, ist->st->time_base, ost->st->time_base) - ost_tb_start_time;
                        else
                            opkt.pts= AV_NOPTS_VALUE;

                        if (pkt->dts == AV_NOPTS_VALUE)
                            opkt.dts = av_rescale_q(ist->pts, AV_TIME_BASE_Q, ost->st->time_base);
                        else
                            opkt.dts = av_rescale_q(pkt->dts, ist->st->time_base, ost->st->time_base);
                        opkt.dts -= ost_tb_start_time;

                        opkt.duration = av_rescale_q(pkt->duration, ist->st->time_base, ost->st->time_base);
                        opkt.flags= pkt->flags;

                        //FIXME remove the following 2 lines they shall be replaced by the bitstream filters
                        if(ost->st->codec->codec_id != CODEC_ID_H264) {
                        if(av_parser_change(ist->st->parser, ost->st->codec, &opkt.data, &opkt.size, data_buf, data_size, pkt->flags & PKT_FLAG_KEY))
                            opkt.destruct= av_destruct_packet;
                        } else {
                            opkt.data = data_buf;
                            opkt.size = data_size;
                        }

                        write_frame(os, &opkt, ost->st->codec, bitstream_filters[ost->file_index][opkt.stream_index]);
                        ost->st->codec->frame_number++;
                        ost->frame_number++;
                        av_free_packet(&opkt);
                    }
                }
            }
        av_free(buffer_to_free);
        /* XXX: allocate the subtitles in the codec ? */
        if (subtitle_to_free) {
            if (subtitle_to_free->rects != NULL) {
                for (i = 0; i < subtitle_to_free->num_rects; i++) {
                    av_freep(&subtitle_to_free->rects[i]->pict.data[0]);
                    av_freep(&subtitle_to_free->rects[i]->pict.data[1]);
                    av_freep(&subtitle_to_free->rects[i]);
                }
                av_freep(&subtitle_to_free->rects);
            }
            subtitle_to_free->num_rects = 0;
            subtitle_to_free = NULL;
        }
    }
 discard_packet:
    if (pkt == NULL) {
        /* EOF handling */

        for(i=0;i<nb_ostreams;i++) {
            ost = ost_table[i];
            if (ost->source_index == ist_index) {
                AVCodecContext *enc= ost->st->codec;
                os = output_files[ost->file_index];

                if(ost->st->codec->codec_type == CODEC_TYPE_AUDIO && enc->frame_size <=1)
                    continue;
                if(ost->st->codec->codec_type == CODEC_TYPE_VIDEO && (os->oformat->flags & AVFMT_RAWPICTURE))
                    continue;

                if (ost->encoding_needed) {
                    for(;;) {
                        AVPacket pkt;
                        int fifo_bytes;
                        av_init_packet(&pkt);
                        pkt.stream_index= ost->index;

                        switch(ost->st->codec->codec_type) {
                        case CODEC_TYPE_AUDIO:
                            fifo_bytes = av_fifo_size(ost->fifo);
                            ret = 0;
                            /* encode any samples remaining in fifo */
                            if (fifo_bytes > 0) {
                                int osize = av_get_bits_per_sample_format(enc->sample_fmt) >> 3;
                                int fs_tmp = enc->frame_size;

                                av_fifo_generic_read(ost->fifo, samples, fifo_bytes, NULL);
                                if (enc->codec->capabilities & CODEC_CAP_SMALL_LAST_FRAME) {
                                    enc->frame_size = fifo_bytes / (osize * enc->channels);
                                } else { /* pad */
                                    int frame_bytes = enc->frame_size*osize*enc->channels;
                                    if (samples_size < frame_bytes)
                                        av_exit(1);
                                    memset((uint8_t*)samples+fifo_bytes, 0, frame_bytes - fifo_bytes);
                                }

                                ret = avcodec_encode_audio(enc, bit_buffer, bit_buffer_size, samples);
                                pkt.duration = av_rescale((int64_t)enc->frame_size*ost->st->time_base.den,
                                                          ost->st->time_base.num, enc->sample_rate);
                                enc->frame_size = fs_tmp;
                            }
                            if(ret <= 0) {
                                ret = avcodec_encode_audio(enc, bit_buffer, bit_buffer_size, NULL);
                            }
                            if (ret < 0) {
                                fprintf(stderr, "Audio encoding failed\n");
                                av_exit(1);
                            }
                            audio_size += ret;
                            pkt.flags |= PKT_FLAG_KEY;
                            break;
                        case CODEC_TYPE_VIDEO:
                            ret = avcodec_encode_video(enc, bit_buffer, bit_buffer_size, NULL);
                            if (ret < 0) {
                                fprintf(stderr, "Video encoding failed\n");
                                av_exit(1);
                            }
                            video_size += ret;
                            if(enc->coded_frame && enc->coded_frame->key_frame)
                                pkt.flags |= PKT_FLAG_KEY;
                            if (ost->logfile && enc->stats_out) {
                                fprintf(ost->logfile, "%s", enc->stats_out);
                            }
                            break;
                        default:
                            ret=-1;
                        }

                        if(ret<=0)
                            break;
                        pkt.data= bit_buffer;
                        pkt.size= ret;
                        if(enc->coded_frame && enc->coded_frame->pts != AV_NOPTS_VALUE)
                            pkt.pts= av_rescale_q(enc->coded_frame->pts, enc->time_base, ost->st->time_base);
                        write_frame(os, &pkt, ost->st->codec, bitstream_filters[ost->file_index][pkt.stream_index]);
                    }
                }
            }
        }
    }

    return 0;
 fail_decode:
    return -1;
}

static void print_sdp(AVFormatContext **avc, int n)
{
    char sdp[2048];

    avf_sdp_create(avc, n, sdp, sizeof(sdp));
    printf("SDP:\n%s\n", sdp);
    fflush(stdout);
}

static int stream_index_from_inputs(AVFormatContext **input_files,
                                    int nb_input_files,
                                    AVInputFile *file_table,
                                    AVInputStream **ist_table,
                                    enum CodecType type,
                                    int programid)
{
    int p, q, z;
    for(z=0; z<nb_input_files; z++) {
        AVFormatContext *ic = input_files[z];
        for(p=0; p<ic->nb_programs; p++) {
            AVProgram *program = ic->programs[p];
            if(program->id != programid)
                continue;
            for(q=0; q<program->nb_stream_indexes; q++) {
                int sidx = program->stream_index[q];
                int ris = file_table[z].ist_index + sidx;
                if(ist_table[ris]->discard && ic->streams[sidx]->codec->codec_type == type)
                    return ris;
            }
        }
    }

    return -1;
}

/*
 * The following code is the main loop of the file converter
 */
static int av_encode(AVFormatContext **output_files,
                     int nb_output_files,
                     AVFormatContext **input_files,
                     int nb_input_files,
                     AVStreamMap *stream_maps, int nb_stream_maps)
{
    int ret = 0, i, j, k, n, nb_istreams = 0, nb_ostreams = 0;
    AVFormatContext *is, *os;
    AVCodecContext *codec, *icodec;
    AVOutputStream *ost, **ost_table = NULL;
    AVInputStream *ist, **ist_table = NULL;
    AVInputFile *file_table;
    char error[1024];
    int key;
    int want_sdp = 1;
    uint8_t no_packet[MAX_FILES]={0};
    int no_packet_count=0;

    file_table= av_mallocz(nb_input_files * sizeof(AVInputFile));
    if (!file_table)
        goto fail;

    /* input stream init */
    j = 0;
    for(i=0;i<nb_input_files;i++) {
        is = input_files[i];
        file_table[i].ist_index = j;
        file_table[i].nb_streams = is->nb_streams;
        j += is->nb_streams;
    }
    nb_istreams = j;

    ist_table = av_mallocz(nb_istreams * sizeof(AVInputStream *));
    if (!ist_table)
        goto fail;

    for(i=0;i<nb_istreams;i++) {
        ist = av_mallocz(sizeof(AVInputStream));
        if (!ist)
            goto fail;
        ist_table[i] = ist;
    }
    j = 0;
    for(i=0;i<nb_input_files;i++) {
        is = input_files[i];
        for(k=0;k<is->nb_streams;k++) {
            ist = ist_table[j++];
            ist->st = is->streams[k];
            ist->file_index = i;
            ist->index = k;
            ist->discard = 1; /* the stream is discarded by default
                                 (changed later) */

            if (rate_emu) {
                ist->start = av_gettime();
            }
        }
    }

    /* output stream init */
    nb_ostreams = 0;
    for(i=0;i<nb_output_files;i++) {
        os = output_files[i];
        if (!os->nb_streams) {
            dump_format(output_files[i], i, output_files[i]->filename, 1);
            fprintf(stderr, "Output file #%d does not contain any stream\n", i);
            av_exit(1);
        }
        nb_ostreams += os->nb_streams;
    }
    if (nb_stream_maps > 0 && nb_stream_maps != nb_ostreams) {
        fprintf(stderr, "Number of stream maps must match number of output streams\n");
        av_exit(1);
    }

    /* Sanity check the mapping args -- do the input files & streams exist? */
    for(i=0;i<nb_stream_maps;i++) {
        int fi = stream_maps[i].file_index;
        int si = stream_maps[i].stream_index;

        if (fi < 0 || fi > nb_input_files - 1 ||
            si < 0 || si > file_table[fi].nb_streams - 1) {
            fprintf(stderr,"Could not find input stream #%d.%d\n", fi, si);
            av_exit(1);
        }
        fi = stream_maps[i].sync_file_index;
        si = stream_maps[i].sync_stream_index;
        if (fi < 0 || fi > nb_input_files - 1 ||
            si < 0 || si > file_table[fi].nb_streams - 1) {
            fprintf(stderr,"Could not find sync stream #%d.%d\n", fi, si);
            av_exit(1);
        }
    }

    ost_table = av_mallocz(sizeof(AVOutputStream *) * nb_ostreams);
    if (!ost_table)
        goto fail;
    for(i=0;i<nb_ostreams;i++) {
        ost = av_mallocz(sizeof(AVOutputStream));
        if (!ost)
            goto fail;
        ost_table[i] = ost;
    }

    n = 0;
    for(k=0;k<nb_output_files;k++) {
        os = output_files[k];
        for(i=0;i<os->nb_streams;i++,n++) {
            int found;
            ost = ost_table[n];
            ost->file_index = k;
            ost->index = i;
            ost->st = os->streams[i];
            if (nb_stream_maps > 0) {
                ost->source_index = file_table[stream_maps[n].file_index].ist_index +
                    stream_maps[n].stream_index;

                /* Sanity check that the stream types match */
                if (ist_table[ost->source_index]->st->codec->codec_type != ost->st->codec->codec_type) {
                    int i= ost->file_index;
                    dump_format(output_files[i], i, output_files[i]->filename, 1);
                    fprintf(stderr, "Codec type mismatch for mapping #%d.%d -> #%d.%d\n",
                        stream_maps[n].file_index, stream_maps[n].stream_index,
                        ost->file_index, ost->index);
                    av_exit(1);
                }

            } else {
                if(opt_programid) {
                    found = 0;
                    j = stream_index_from_inputs(input_files, nb_input_files, file_table, ist_table, ost->st->codec->codec_type, opt_programid);
                    if(j != -1) {
                        ost->source_index = j;
                        found = 1;
                    }
                } else {
                    /* get corresponding input stream index : we select the first one with the right type */
                    found = 0;
                    for(j=0;j<nb_istreams;j++) {
                        ist = ist_table[j];
                        if (ist->discard &&
                            ist->st->codec->codec_type == ost->st->codec->codec_type) {
                            ost->source_index = j;
                            found = 1;
                            break;
                        }
                    }
                }

                if (!found) {
                    if(! opt_programid) {
                        /* try again and reuse existing stream */
                        for(j=0;j<nb_istreams;j++) {
                            ist = ist_table[j];
                            if (ist->st->codec->codec_type == ost->st->codec->codec_type) {
                                ost->source_index = j;
                                found = 1;
                            }
                        }
                    }
                    if (!found) {
                        int i= ost->file_index;
                        dump_format(output_files[i], i, output_files[i]->filename, 1);
                        fprintf(stderr, "Could not find input stream matching output stream #%d.%d\n",
                                ost->file_index, ost->index);
                        av_exit(1);
                    }
                }
            }
            ist = ist_table[ost->source_index];
            ist->discard = 0;
            ost->sync_ist = (nb_stream_maps > 0) ?
                ist_table[file_table[stream_maps[n].sync_file_index].ist_index +
                         stream_maps[n].sync_stream_index] : ist;
        }
    }

    /* for each output stream, we compute the right encoding parameters */
    for(i=0;i<nb_ostreams;i++) {
        AVMetadataTag *lang;
        ost = ost_table[i];
        os = output_files[ost->file_index];
        ist = ist_table[ost->source_index];

        codec = ost->st->codec;
        icodec = ist->st->codec;

        if ((lang=av_metadata_get(ist->st->metadata, "language", NULL, 0))
            &&   !av_metadata_get(ost->st->metadata, "language", NULL, 0))
            av_metadata_set(&ost->st->metadata, "language", lang->value);

        ost->st->disposition = ist->st->disposition;
        codec->bits_per_raw_sample= icodec->bits_per_raw_sample;
        codec->chroma_sample_location = icodec->chroma_sample_location;

        if (ost->st->stream_copy) {
            /* if stream_copy is selected, no need to decode or encode */
            codec->codec_id = icodec->codec_id;
            codec->codec_type = icodec->codec_type;

            if(!codec->codec_tag){
                if(   !os->oformat->codec_tag
                   || av_codec_get_id (os->oformat->codec_tag, icodec->codec_tag) > 0
                   || av_codec_get_tag(os->oformat->codec_tag, icodec->codec_id) <= 0)
                    codec->codec_tag = icodec->codec_tag;
            }

            codec->bit_rate = icodec->bit_rate;
            codec->extradata= icodec->extradata;
            codec->extradata_size= icodec->extradata_size;
            if(av_q2d(icodec->time_base)*icodec->ticks_per_frame > av_q2d(ist->st->time_base) && av_q2d(ist->st->time_base) < 1.0/1000){
                codec->time_base = icodec->time_base;
                codec->time_base.num *= icodec->ticks_per_frame;
            }else
                codec->time_base = ist->st->time_base;
            switch(codec->codec_type) {
            case CODEC_TYPE_AUDIO:
                if(audio_volume != 256) {
                    fprintf(stderr,"-acodec copy and -vol are incompatible (frames are not decoded)\n");
                    av_exit(1);
                }
                codec->channel_layout = icodec->channel_layout;
                codec->sample_rate = icodec->sample_rate;
                codec->channels = icodec->channels;
                codec->frame_size = icodec->frame_size;
                codec->block_align= icodec->block_align;
                if(codec->block_align == 1 && codec->codec_id == CODEC_ID_MP3)
                    codec->block_align= 0;
                if(codec->codec_id == CODEC_ID_AC3)
                    codec->block_align= 0;
                break;
            case CODEC_TYPE_VIDEO:
                codec->pix_fmt = icodec->pix_fmt;
                codec->width = icodec->width;
                codec->height = icodec->height;
                codec->has_b_frames = icodec->has_b_frames;
                break;
            case CODEC_TYPE_SUBTITLE:
                codec->width = icodec->width;
                codec->height = icodec->height;
                break;
            default:
                abort();
            }
        } else {
            switch(codec->codec_type) {
            case CODEC_TYPE_AUDIO:
                ost->fifo= av_fifo_alloc(1024);
                if(!ost->fifo)
                    goto fail;
                ost->reformat_pair = MAKE_SFMT_PAIR(SAMPLE_FMT_NONE,SAMPLE_FMT_NONE);
                ost->audio_resample = codec->sample_rate != icodec->sample_rate || audio_sync_method > 1;
                icodec->request_channels = codec->channels;
                ist->decoding_needed = 1;
                ost->encoding_needed = 1;
                break;
            case CODEC_TYPE_VIDEO:
                if (ost->st->codec->pix_fmt == PIX_FMT_NONE) {
                    fprintf(stderr, "Video pixel format is unknown, stream cannot be decoded\n");
                    av_exit(1);
                }
                ost->video_crop = ((frame_leftBand + frame_rightBand + frame_topBand + frame_bottomBand) != 0);
                ost->video_pad = ((frame_padleft + frame_padright + frame_padtop + frame_padbottom) != 0);
                ost->video_resample = ((codec->width != icodec->width -
                                (frame_leftBand + frame_rightBand) +
                                (frame_padleft + frame_padright)) ||
                        (codec->height != icodec->height -
                                (frame_topBand  + frame_bottomBand) +
                                (frame_padtop + frame_padbottom)) ||
                        (codec->pix_fmt != icodec->pix_fmt));
                if (ost->video_crop) {
                    ost->topBand    = ost->original_topBand    = frame_topBand;
                    ost->bottomBand = ost->original_bottomBand = frame_bottomBand;
                    ost->leftBand   = ost->original_leftBand   = frame_leftBand;
                    ost->rightBand  = ost->original_rightBand  = frame_rightBand;
                }
                if (ost->video_pad) {
                    ost->padtop = frame_padtop;
                    ost->padleft = frame_padleft;
                    ost->padbottom = frame_padbottom;
                    ost->padright = frame_padright;
                    if (!ost->video_resample) {
                        avcodec_get_frame_defaults(&ost->pict_tmp);
                        if(avpicture_alloc((AVPicture*)&ost->pict_tmp, codec->pix_fmt,
                                         codec->width, codec->height))
                            goto fail;
                    }
                }
                if (ost->video_resample) {
                    avcodec_get_frame_defaults(&ost->pict_tmp);
                    if(avpicture_alloc((AVPicture*)&ost->pict_tmp, codec->pix_fmt,
                                         codec->width, codec->height)) {
                        fprintf(stderr, "Cannot allocate temp picture, check pix fmt\n");
                        av_exit(1);
                    }
                    sws_flags = av_get_int(sws_opts, "sws_flags", NULL);
                    ost->img_resample_ctx = sws_getContext(
                            icodec->width - (frame_leftBand + frame_rightBand),
                            icodec->height - (frame_topBand + frame_bottomBand),
                            icodec->pix_fmt,
                            codec->width - (frame_padleft + frame_padright),
                            codec->height - (frame_padtop + frame_padbottom),
                            codec->pix_fmt,
                            sws_flags, NULL, NULL, NULL);
                    if (ost->img_resample_ctx == NULL) {
                        fprintf(stderr, "Cannot get resampling context\n");
                        av_exit(1);
                    }

                    ost->original_height = icodec->height;
                    ost->original_width  = icodec->width;

                    ost->resample_height = icodec->height - (frame_topBand  + frame_bottomBand);
                    ost->resample_width  = icodec->width  - (frame_leftBand + frame_rightBand);
                    ost->resample_pix_fmt= icodec->pix_fmt;
                    codec->bits_per_raw_sample= 0;
                }
                ost->encoding_needed = 1;
                ist->decoding_needed = 1;
                break;
            case CODEC_TYPE_SUBTITLE:
                ost->encoding_needed = 1;
                ist->decoding_needed = 1;
                break;
            default:
                abort();
                break;
            }
            /* two pass mode */
            if (ost->encoding_needed &&
                (codec->flags & (CODEC_FLAG_PASS1 | CODEC_FLAG_PASS2))) {
                char logfilename[1024];
                FILE *f;
                int size;
                char *logbuffer;

                snprintf(logfilename, sizeof(logfilename), "%s-%d.log",
                         pass_logfilename_prefix ? pass_logfilename_prefix : DEFAULT_PASS_LOGFILENAME_PREFIX,
                         i);
                if (codec->flags & CODEC_FLAG_PASS1) {
                    f = fopen(logfilename, "w");
                    if (!f) {
                        fprintf(stderr, "Cannot write log file '%s' for pass-1 encoding: %s\n", logfilename, strerror(errno));
                        av_exit(1);
                    }
                    ost->logfile = f;
                } else {
                    /* read the log file */
                    f = fopen(logfilename, "r");
                    if (!f) {
                        fprintf(stderr, "Cannot read log file '%s' for pass-2 encoding: %s\n", logfilename, strerror(errno));
                        av_exit(1);
                    }
                    fseek(f, 0, SEEK_END);
                    size = ftell(f);
                    fseek(f, 0, SEEK_SET);
                    logbuffer = av_malloc(size + 1);
                    if (!logbuffer) {
                        fprintf(stderr, "Could not allocate log buffer\n");
                        av_exit(1);
                    }
                    size = fread(logbuffer, 1, size, f);
                    fclose(f);
                    logbuffer[size] = '\0';
                    codec->stats_in = logbuffer;
                }
            }
        }
        if(codec->codec_type == CODEC_TYPE_VIDEO){
            int size= codec->width * codec->height;
            bit_buffer_size= FFMAX(bit_buffer_size, 6*size + 200);
        }
    }

    if (!bit_buffer)