ffmpeg.c

                    f = fopen(logfilename, "r");
                    if (!f) {
                        perror(logfilename);
                        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");
                        exit(1);
                    }
                    fread(logbuffer, 1, size, f);
                    fclose(f);
                    logbuffer[size] = '\0';
                    codec->stats_in = logbuffer;
                }
            }
        }
    }

    /* dump the file output parameters - cannot be done before in case
       of stream copy */
    for(i=0;i<nb_output_files;i++) {
        dump_format(output_files[i], i, output_files[i]->filename, 1);
    }

    /* dump the stream mapping */
    fprintf(stderr, "Stream mapping:\n");
    for(i=0;i<nb_ostreams;i++) {
        ost = ost_table[i];
        fprintf(stderr, "  Stream #%d.%d -> #%d.%d\n",
                ist_table[ost->source_index]->file_index,
                ist_table[ost->source_index]->index,
                ost->file_index, 
                ost->index);
    }

    /* open each encoder */
    for(i=0;i<nb_ostreams;i++) {
        ost = ost_table[i];
        if (ost->encoding_needed) {
            AVCodec *codec;
            codec = avcodec_find_encoder(ost->st->codec.codec_id);
            if (!codec) {
                fprintf(stderr, "Unsupported codec for output stream #%d.%d\n", 
                        ost->file_index, ost->index);
                exit(1);
            }
            if (avcodec_open(&ost->st->codec, codec) < 0) {
                fprintf(stderr, "Error while opening codec for stream #%d.%d - maybe incorrect parameters such as bit_rate, rate, width or height\n", 
                        ost->file_index, ost->index);
                exit(1);
            }
        }
    }

    /* open each decoder */
    for(i=0;i<nb_istreams;i++) {
        ist = ist_table[i];
        if (ist->decoding_needed) {
            AVCodec *codec;
            codec = avcodec_find_decoder(ist->st->codec.codec_id);
            if (!codec) {
                fprintf(stderr, "Unsupported codec (id=%d) for input stream #%d.%d\n", 
                        ist->st->codec.codec_id, ist->file_index, ist->index);
                exit(1);
            }
            if (avcodec_open(&ist->st->codec, codec) < 0) {
                fprintf(stderr, "Error while opening codec for input stream #%d.%d\n", 
                        ist->file_index, ist->index);
                exit(1);
            }
            //if (ist->st->codec.codec_type == CODEC_TYPE_VIDEO)
            //    ist->st->codec.flags |= CODEC_FLAG_REPEAT_FIELD;
            ist->frame_decoded = 1;
        }
    }

    /* init pts */
    for(i=0;i<nb_istreams;i++) {
        ist = ist_table[i];
    }
    
    /* compute buffer size max (should use a complete heuristic) */
    for(i=0;i<nb_input_files;i++) {
        file_table[i].buffer_size_max = 2048;
    }

    /* open files and write file headers */
    for(i=0;i<nb_output_files;i++) {
        os = output_files[i];
        if (av_write_header(os) < 0) {
            fprintf(stderr, "Could not write header for output file #%d (incorrect codec paramters ?)\n", i);
            ret = -EINVAL;
            goto fail;
        }
    }

#ifndef CONFIG_WIN32
    if (!do_play) {
        fprintf(stderr, "Press [q] to stop encoding\n");
    } else {
        fprintf(stderr, "Press [q] to stop playing\n");
    }
#endif
    term_init();

    stream_no_data = 0;
    key = -1;

    for(;;) {
        int file_index, ist_index;
        AVPacket pkt;
        UINT8 *ptr;
        int len;
        UINT8 *data_buf;
        int data_size, got_picture;
        AVPicture picture;
        short samples[AVCODEC_MAX_AUDIO_FRAME_SIZE / 2];
        void *buffer_to_free;
        double pts_min;
        
    redo:
        /* if 'q' pressed, exits */
        if (key) {
            /* read_key() returns 0 on EOF */
            key = read_key();
            if (key == 'q')
                break;
        }

        /* select the stream that we must read now by looking at the
           smallest output pts */
        file_index = -1;
        pts_min = 1e10;
        for(i=0;i<nb_ostreams;i++) {
            double pts;
            ost = ost_table[i];
            os = output_files[ost->file_index];
            ist = ist_table[ost->source_index];
            pts = (double)ost->st->pts.val * os->pts_num / os->pts_den;
            if (!file_table[ist->file_index].eof_reached && 
                pts < pts_min) {
                pts_min = pts;
                file_index = ist->file_index;
            }
        }
        /* if none, if is finished */
        if (file_index < 0) {
            break;
        }

        /* finish if recording time exhausted */
        if (recording_time > 0 && pts_min >= (recording_time / 1000000.0))
            break;

        /* read a packet from it and output it in the fifo */
        is = input_files[file_index];
        if (av_read_packet(is, &pkt) < 0) {
            file_table[file_index].eof_reached = 1;
            continue;
        }
        if (!pkt.size) {
            stream_no_data = is;
        } else {
            stream_no_data = 0;
        }
        /* the following test is needed in case new streams appear
           dynamically in stream : we ignore them */
        if (pkt.stream_index >= file_table[file_index].nb_streams)
            goto discard_packet;
        ist_index = file_table[file_index].ist_index + pkt.stream_index;
        ist = ist_table[ist_index];
        if (ist->discard)
            goto discard_packet;

        if (do_hex_dump) {
            printf("stream #%d, size=%d:\n", pkt.stream_index, pkt.size);
            av_hex_dump(pkt.data, pkt.size);
        }

        //        printf("read #%d.%d size=%d\n", ist->file_index, ist->index, pkt.size);

        len = pkt.size;
        ptr = pkt.data;
        pts_set = 0;
        while (len > 0) {
            INT64 ipts;

            ipts = AV_NOPTS_VALUE;

            /* decode the packet if needed */
            data_buf = NULL; /* fail safe */
            data_size = 0;
            if (ist->decoding_needed) {
                /* NOTE1: we only take into account the PTS if a new
                   frame has begun (MPEG semantics) */
                /* NOTE2: even if the fraction is not initialized,
                   av_frac_set can be used to set the integer part */
                if (ist->frame_decoded && 
                    pkt.pts != AV_NOPTS_VALUE && 
                    !pts_set) {
                    ipts = pkt.pts;
                    ist->frame_decoded = 0;
                    pts_set = 1;
                }

                switch(ist->st->codec.codec_type) {
                case CODEC_TYPE_AUDIO:
                    /* XXX: could avoid copy if PCM 16 bits with same
                       endianness as CPU */
                    ret = avcodec_decode_audio(&ist->st->codec, samples, &data_size,
                                               ptr, len);
                    if (ret < 0)
                        goto fail_decode;
                    /* Some bug in mpeg audio decoder gives */
                    /* data_size < 0, it seems they are overflows */
                    if (data_size <= 0) {
                        /* no audio frame */
                        ptr += ret;
                        len -= ret;
                        continue;
                    }
                    data_buf = (UINT8 *)samples;
                    break;
                case CODEC_TYPE_VIDEO:
                    if (ist->st->codec.codec_id == CODEC_ID_RAWVIDEO) {
                        int size;

                        size = (ist->st->codec.width * ist->st->codec.height);
                        avpicture_fill(&picture, ptr, 
                                     ist->st->codec.pix_fmt,
                                     ist->st->codec.width,
                                     ist->st->codec.height);
                        ret = len;
                    } else {
                        data_size = (ist->st->codec.width * ist->st->codec.height * 3) / 2;
                        ret = avcodec_decode_video(&ist->st->codec, 
                                                   &picture, &got_picture, ptr, len);
                        if (ret < 0) {
                        fail_decode:
                            fprintf(stderr, "Error while decoding stream #%d.%d\n",
                                    ist->file_index, ist->index);
                            av_free_packet(&pkt);
                            goto redo;
                        }
                        if (!got_picture) {
                            /* no picture yet */
                            ptr += ret;
                            len -= ret;
                            continue;
                        }
                                  
                    }
                    break;
                default:
                    goto fail_decode;
                }
            } else {
                data_buf = ptr;
                data_size = len;
                ret = len;
            }
            ptr += ret;
            len -= ret;

            buffer_to_free = 0;
            if (ist->st->codec.codec_type == CODEC_TYPE_VIDEO) {
                pre_process_video_frame(ist, &picture, &buffer_to_free);
            }

            ist->frame_decoded = 1;

#if 0
            /* mpeg PTS deordering : if it is a P or I frame, the PTS
               is the one of the next displayed one */
            /* XXX: add mpeg4 too ? */
            if (ist->st->codec.codec_id == CODEC_ID_MPEG1VIDEO) {
                if (ist->st->codec.pict_type != B_TYPE) {
                    INT64 tmp;
                    tmp = ist->last_ip_pts;
                    ist->last_ip_pts  = ist->frac_pts.val;
                    ist->frac_pts.val = tmp;
                }
            }
#endif
            /* transcode raw format, encode packets and output them */

            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];

                    if (ipts != AV_NOPTS_VALUE) {
#if 0
                        printf("%d: got pts=%f %f\n", 
                               i, pkt.pts / 90000.0, 
                               (ipts - ost->st->pts.val) / 90000.0);
#endif
                        /* set the input output pts pairs */
                        ost->sync_ipts = (double)ipts * is->pts_num / 
                            is->pts_den;
                        /* XXX: take into account the various fifos,
                           in particular for audio */
                        ost->sync_opts = ost->st->pts.val;
                        //printf("ipts=%lld sync_ipts=%f sync_opts=%lld pts.val=%lld pkt.pts=%lld\n", ipts, ost->sync_ipts, ost->sync_opts, ost->st->pts.val, pkt.pts); 
                    } else {
                        //printf("pts.val=%lld\n", ost->st->pts.val); 
                    }

                    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:
                            /* find an audio stream for synchro */
                            {
                                int i;
                                AVOutputStream *audio_sync, *ost1;
                                audio_sync = NULL;
                                for(i=0;i<nb_ostreams;i++) {
                                    ost1 = ost_table[i];
                                    if (ost1->file_index == ost->file_index &&
                                        ost1->st->codec.codec_type == CODEC_TYPE_AUDIO) {
                                        audio_sync = ost1;
                                        break;
                                    }
                                }

                                do_video_out(os, ost, ist, &picture, &frame_size, audio_sync);
                                if (do_vstats)
                                    do_video_stats(os, ost, frame_size);
                            }
                            break;
                        default:
                            av_abort();
                        }
                    } else {
                        /* no reencoding needed : output the packet directly */
                        /* force the input stream PTS */
                        av_write_frame(os, ost->index, data_buf, data_size);
			ost->st->codec.frame_number++;
			ost->frame_number++;
                    }
                }
            }
            av_free(buffer_to_free);
            ipts = AV_NOPTS_VALUE;
        }
    discard_packet:
        av_free_packet(&pkt);
        
        /* dump report by using the output first video and audio streams */
        print_report(output_files, ost_table, nb_ostreams, 0);
    }
    term_exit();

    /* dump report by using the first video and audio streams */
    print_report(output_files, ost_table, nb_ostreams, 1);

    /* close each encoder */
    for(i=0;i<nb_ostreams;i++) {
        ost = ost_table[i];
        if (ost->encoding_needed) {
            av_freep(&ost->st->codec.stats_in);
            avcodec_close(&ost->st->codec);
        }
    }
    
    /* close each decoder */
    for(i=0;i<nb_istreams;i++) {
        ist = ist_table[i];
        if (ist->decoding_needed) {
            avcodec_close(&ist->st->codec);
        }
    }
    

    /* write the trailer if needed and close file */
    for(i=0;i<nb_output_files;i++) {
        os = output_files[i];
        av_write_trailer(os);
    }
    /* finished ! */
    
    ret = 0;
 fail1:
    av_free(file_table);

    if (ist_table) {
        for(i=0;i<nb_istreams;i++) {
            ist = ist_table[i];
            av_free(ist);
        }
        av_free(ist_table);
    }
    if (ost_table) {
        for(i=0;i<nb_ostreams;i++) {
            ost = ost_table[i];
            if (ost) {
                if (ost->logfile) {
                    fclose(ost->logfile);
                    ost->logfile = NULL;
                }
                fifo_free(&ost->fifo); /* works even if fifo is not
                                          initialized but set to zero */
                av_free(ost->pict_tmp.data[0]);
                if (ost->video_resample)
                    img_resample_close(ost->img_resample_ctx);
                if (ost->audio_resample)
                    audio_resample_close(ost->resample);
                av_free(ost);
            }
        }
        av_free(ost_table);
    }
    return ret;
 fail:
    ret = -ENOMEM;
    goto fail1;
}

#if 0
int file_read(const char *filename)
{
    URLContext *h;
    unsigned char buffer[1024];
    int len, i;

    if (url_open(&h, filename, O_RDONLY) < 0) {
        printf("could not open '%s'\n", filename);
        return -1;
    }
    for(;;) {
        len = url_read(h, buffer, sizeof(buffer));
        if (len <= 0)
            break;
        for(i=0;i<len;i++) putchar(buffer[i]);
    }
    url_close(h);
    return 0;
}
#endif

void show_licence(void)
{
    printf(
    "ffmpeg version " FFMPEG_VERSION "\n"
    "Copyright (c) 2000, 2001, 2002 Fabrice Bellard\n"
    "This library is free software; you can redistribute it and/or\n"
    "modify it under the terms of the GNU Lesser General Public\n"
    "License as published by the Free Software Foundation; either\n"
    "version 2 of the License, or (at your option) any later version.\n"
    "\n"
    "This library is distributed in the hope that it will be useful,\n"
    "but WITHOUT ANY WARRANTY; without even the implied warranty of\n"
    "MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU\n"
    "Lesser General Public License for more details.\n"
    "\n"
    "You should have received a copy of the GNU Lesser General Public\n"
    "License along with this library; if not, write to the Free Software\n"
    "Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\n"
    );
    exit(1);
}

void opt_format(const char *arg)
{
    file_iformat = av_find_input_format(arg);
    file_oformat = guess_format(arg, NULL, NULL);
    if (!file_iformat && !file_oformat) {
        fprintf(stderr, "Unknown input or output format: %s\n", arg);
        exit(1);
    }
}

void opt_video_bitrate(const char *arg)
{
    video_bit_rate = atoi(arg) * 1000;
}

void opt_video_bitrate_tolerance(const char *arg)
{
    video_bit_rate_tolerance = atoi(arg) * 1000;
}

void opt_video_bitrate_max(const char *arg)
{
    video_rc_max_rate = atoi(arg) * 1000;
}

void opt_video_bitrate_min(const char *arg)
{
    video_rc_min_rate = atoi(arg) * 1000;
}

void opt_video_buffer_size(const char *arg)
{
    video_rc_buffer_size = atoi(arg) * 1000;
}

void opt_video_rc_eq(char *arg)
{
    video_rc_eq = arg;
}

void opt_video_rc_override_string(char *arg)
{
    video_rc_override_string = arg;
}


void opt_workaround_bugs(const char *arg)
{
    workaround_bugs = atoi(arg);
}

void opt_dct_algo(const char *arg)
{
    dct_algo = atoi(arg);
}

void opt_idct_algo(const char *arg)
{
    idct_algo = atoi(arg);
}


void opt_error_resilience(const char *arg)
{
    error_resilience = atoi(arg);
}

void opt_error_concealment(const char *arg)
{
    error_concealment = atoi(arg);
}


void opt_frame_rate(const char *arg)
{
    frame_rate = (int)(strtod(arg, 0) * FRAME_RATE_BASE);
}


void opt_frame_crop_top(const char *arg)
{
    frame_topBand = atoi(arg); 
    if (frame_topBand < 0) {
        fprintf(stderr, "Incorrect top crop size\n");
        exit(1);
    }
    if ((frame_topBand % 2) != 0) {
        fprintf(stderr, "Top crop size must be a multiple of 2\n");
        exit(1);
    }
    if ((frame_topBand) >= frame_height){
    	fprintf(stderr, "Vertical crop dimensions are outside the range of the original image.\nRemember to crop first and scale second.\n");
        exit(1);
    }
    frame_height -= frame_topBand;
}

void opt_frame_crop_bottom(const char *arg)
{
    frame_bottomBand = atoi(arg);
    if (frame_bottomBand < 0) {
        fprintf(stderr, "Incorrect bottom crop size\n");
        exit(1);
    }
    if ((frame_bottomBand % 2) != 0) {
        fprintf(stderr, "Bottom crop size must be a multiple of 2\n");
        exit(1);        
    }
    if ((frame_bottomBand) >= frame_height){
    	fprintf(stderr, "Vertical crop dimensions are outside the range of the original image.\nRemember to crop first and scale second.\n");
        exit(1);
    }
    frame_height -= frame_bottomBand;
}

void opt_frame_crop_left(const char *arg)
{
    frame_leftBand = atoi(arg);
    if (frame_leftBand < 0) {
        fprintf(stderr, "Incorrect left crop size\n");
        exit(1);
    }
    if ((frame_leftBand % 2) != 0) {
        fprintf(stderr, "Left crop size must be a multiple of 2\n");
        exit(1);
    }
    if ((frame_leftBand) >= frame_width){
    	fprintf(stderr, "Horizontal crop dimensions are outside the range of the original image.\nRemember to crop first and scale second.\n");
        exit(1);
    }
    frame_width -= frame_leftBand;
}

void opt_frame_crop_right(const char *arg)
{
    frame_rightBand = atoi(arg);
    if (frame_rightBand < 0) {
        fprintf(stderr, "Incorrect right crop size\n");
        exit(1);
    }
    if ((frame_rightBand % 2) != 0) {
        fprintf(stderr, "Right crop size must be a multiple of 2\n");
        exit(1);        
    }
    if ((frame_rightBand) >= frame_width){
    	fprintf(stderr, "Horizontal crop dimensions are outside the range of the original image.\nRemember to crop first and scale second.\n");
        exit(1);
    }
    frame_width -= frame_rightBand;
}

void opt_frame_size(const char *arg)
{
    parse_image_size(&frame_width, &frame_height, arg);
    if (frame_width <= 0 || frame_height <= 0) {
        fprintf(stderr, "Incorrect frame size\n");
        exit(1);
    }
    if ((frame_width % 2) != 0 || (frame_height % 2) != 0) {
        fprintf(stderr, "Frame size must be a multiple of 2\n");
        exit(1);
    }
}

void opt_gop_size(const char *arg)
{
    gop_size = atoi(arg);
}

void opt_b_frames(const char *arg)
{
    b_frames = atoi(arg);
    if (b_frames > FF_MAX_B_FRAMES) {
        fprintf(stderr, "\nCannot have more than %d B frames, increase FF_MAX_B_FRAMES.\n", FF_MAX_B_FRAMES);
        exit(1);
    } else if (b_frames < 1) {
        fprintf(stderr, "\nNumber of B frames must be higher than 0\n");
        exit(1);
    }
}

void opt_qscale(const char *arg)
{
    video_qscale = atoi(arg);
    if (video_qscale < 0 ||
        video_qscale > 31) {
        fprintf(stderr, "qscale must be >= 1 and <= 31\n");
        exit(1);
    }
}

void opt_qmin(const char *arg)
{
    video_qmin = atoi(arg);
    if (video_qmin < 0 ||
        video_qmin > 31) {
        fprintf(stderr, "qmin must be >= 1 and <= 31\n");
        exit(1);
    }
}

void opt_qmax(const char *arg)
{
    video_qmax = atoi(arg);
    if (video_qmax < 0 ||
        video_qmax > 31) {
        fprintf(stderr, "qmax must be >= 1 and <= 31\n");
        exit(1);
    }
}

void opt_qdiff(const char *arg)
{
    video_qdiff = atoi(arg);
    if (video_qdiff < 0 ||
        video_qdiff > 31) {
        fprintf(stderr, "qdiff must be >= 1 and <= 31\n");
        exit(1);
    }
}

void opt_qblur(const char *arg)
{
    video_qblur = atof(arg);
}

void opt_qcomp(const char *arg)
{
    video_qcomp = atof(arg);
}

void opt_rc_initial_cplx(const char *arg)
{
    video_rc_initial_cplx = atof(arg);
}
void opt_b_qfactor(const char *arg)
{
    video_b_qfactor = atof(arg);
}
void opt_i_qfactor(const char *arg)
{
    video_i_qfactor = atof(arg);
}
void opt_b_qoffset(const char *arg)
{
    video_b_qoffset = atof(arg);
}
void opt_i_qoffset(const char *arg)
{
    video_i_qoffset = atof(arg);
}

void opt_packet_size(const char *arg)
{
    packet_size= atoi(arg);
}

void opt_audio_bitrate(const char *arg)
{
    audio_bit_rate = atoi(arg) * 1000;
}

void opt_audio_rate(const char *arg)
{
    audio_sample_rate = atoi(arg);
}

void opt_audio_channels(const char *arg)
{
    audio_channels = atoi(arg);
}

void opt_video_device(const char *arg)
{
    v4l_device = strdup(arg);
}

void opt_audio_device(const char *arg)
{
    audio_device = strdup(arg);
}

void opt_audio_codec(const char *arg)
{
    AVCodec *p;

    if (!strcmp(arg, "copy")) {
        audio_stream_copy = 1;
    } else {
        p = first_avcodec;
        while (p) {
            if (!strcmp(p->name, arg) && p->type == CODEC_TYPE_AUDIO)
                break;
            p = p->next;
        }
        if (p == NULL) {
            fprintf(stderr, "Unknown audio codec '%s'\n", arg);
            exit(1);
        } else {
            audio_codec_id = p->id;
        }
    }
}

void add_frame_hooker(const char *arg)
{
    int argc = 0;
    char *argv[64];
    int i;
    char *args = strdup(arg);

    argv[0] = strtok(args, " ");
    while (argc < 62 && (argv[++argc] = strtok(NULL, " "))) {
    }

    i = frame_hook_add(argc, argv);

    if (i != 0) {
        fprintf(stderr, "Failed to add video hook function: %s\n", arg);
        exit(1);
    }
}

const char *motion_str[] = {
    "zero",
    "full",
    "log",
    "phods",
    "epzs",
    "x1",
    NULL,
};

void opt_motion_estimation(const char *arg)
{
    const char **p;
    p = motion_str;
    for(;;) {
        if (!*p) {
            fprintf(stderr, "Unknown motion estimation method '%s'\n", arg);
            exit(1);
        }
        if (!strcmp(*p, arg))
            break;
        p++;
    }
    me_method = (p - motion_str) + 1;
}

void opt_video_codec(const char *arg)
{
    AVCodec *p;

    if (!strcmp(arg, "copy")) {
        video_stream_copy = 1;
    } else {
        p = first_avcodec;
        while (p) {
            if (!strcmp(p->name, arg) && p->type == CODEC_TYPE_VIDEO)
                break;
            p = p->next;
        }
        if (p == NULL) {
            fprintf(stderr, "Unknown video codec '%s'\n", arg);
            exit(1);
        } else {
            video_codec_id = p->id;
        }
    }
}

void opt_map(const char *arg)
{
    AVStreamMap *m;
    const char *p;

    p = arg;
    m = &stream_maps[nb_stream_maps++];

    m->file_index = strtol(arg, (char **)&p, 0);
    if (*p)
        p++;

    m->stream_index = strtol(p, (char **)&p, 0);
}

void opt_recording_time(const char *arg)
{
    recording_time = parse_date(arg, 1);
}

void print_error(const char *filename, int err)
{
    switch(err) {
    case AVERROR_NUMEXPECTED:
        fprintf(stderr, "%s: Incorrect image filename syntax.\n"
                "Use '%%d' to specify the image number:\n"
                "  for img1.jpg, img2.jpg, ..., use 'img%%d.jpg';\n"
                "  for img001.jpg, img002.jpg, ..., use 'img%%03d.jpg'.\n", 
                filename);
        break;
    case AVERROR_INVALIDDATA:
        fprintf(stderr, "%s: Error while parsing header\n", filename);
        break;
    case AVERROR_NOFMT:
        fprintf(stderr, "%s: Unknown format\n", filename);
        break;
    default:
        fprintf(stderr, "%s: Error while opening file\n", filename);
        break;
    }
}

void opt_input_file(const char *filename)
{
    AVFormatContext *ic;
    AVFormatParameters params, *ap = &params;
    int err, i, ret, rfps;

    if (!strcmp(filename, "-"))
        filename = "pipe:";

    /* get default parameters from command line */
    memset(ap, 0, sizeof(*ap));
    ap->sample_rate = audio_sample_rate;
    ap->channels = audio_channels;
    ap->frame_rate = frame_rate;
    ap->width = frame_width;
    ap->height = frame_height;

    /* open the input file with generic libav function */
    err = av_open_input_file(&ic, filename, file_iformat, 0, ap);
    if (err < 0) {
        print_error(filename, err);
        exit(1);
    }
    
    /* If not enough info to get the stream parameters, we decode the
       first frames to get it. (used in mpeg case for example) */
    ret = av_find_stream_info(ic);
    if (ret < 0) {
        fprintf(stderr, "%s: could not find codec parameters\n", filename);
        exit(1);
    }

    /* update the current parameters so that they match the one of the input stream */
    for(i=0;i<ic->nb_streams;i++) {
        AVCodecContext *enc = &ic->streams[i]->codec;
        switch(enc->codec_type) {
        case CODEC_TYPE_AUDIO:
            //fprintf(stderr, "\nInput Audio channels: %d", enc->channels);
            audio_channels = enc->channels;
            audio_sample_rate = enc->sample_rate;
            break;
        case CODEC_TYPE_VIDEO:
            frame_height = enc->height;
            frame_width = enc->width;
            rfps = ic->streams[i]->r_frame_rate;
            enc->workaround_bugs = workaround_bugs;
            enc->error_resilience = error_resilience; 
            enc->error_concealment = error_concealment; 
            enc->idct_algo= idct_algo;
/*            if(enc->codec->capabilities & CODEC_CAP_TRUNCATED)
                enc->flags|= CODEC_FLAG_TRUNCATED; */
            if(/*enc->codec_id==CODEC_ID_MPEG4 || */enc->codec_id==CODEC_ID_MPEG1VIDEO)
                enc->flags|= CODEC_FLAG_TRUNCATED;

            if (enc->frame_rate != rfps) {
                fprintf(stderr,"\nSeems that stream %d comes from film source: %2.2f->%2.2f\n",
                    i, (float)enc->frame_rate / FRAME_RATE_BASE,
                    (float)rfps / FRAME_RATE_BASE);
            }
            /* update the current frame rate to match the stream frame rate */
            frame_rate = rfps;
            break;
        default:
            av_abort();
        }
    }
    
    input_files[nb_input_files] = ic;
    /* dump the file content */
    dump_format(ic, nb_input_files, filename, 0);
    nb_input_files++;
    file_iformat = NULL;
    file_oformat = NULL;
}

void check_audio_video_inputs(int *has_video_ptr, int *has_audio_ptr)
{
    int has_video, has_audio, i, j;
    AVFormatContext *ic;

    has_video = 0;
    has_audio = 0;
    for(j=0;j<nb_input_files;j++) {
        ic = input_files[j];
        for(i=0;i<ic->nb_streams;i++) {
            AVCodecContext *enc = &ic->streams[i]->codec;
            switch(enc->codec_type) {
            case CODEC_TYPE_AUDIO:
                has_audio = 1;
                break;
            case CODEC_TYPE_VIDEO:
                has_video = 1;
                break;
            default:
                av_abort();
            }
        }
    }
    *has_video_ptr = has_video;
    *has_audio_ptr = has_audio;
}

void opt_output_file(const char *filename)
{
    AVStream *st;
    AVFormatContext *oc;
    int use_video, use_audio, nb_streams, input_has_video, input_has_audio;
    int codec_id;

    if (!strcmp(filename, "-"))
        filename = "pipe:";

    oc = av_mallocz(sizeof(AVFormatContext));

    if (!file_oformat) {
        file_oformat = guess_format(NULL, filename, NULL);