ffmpeg.c

                cont:
                frame_available = (ist->st->codec->codec_type == AVMEDIA_TYPE_VIDEO) &&
                                   ost->output_video_filter && avfilter_poll_frame(ost->output_video_filter->inputs[0]);
                avfilter_unref_buffer(ost->picref);
            }
            av_freep(&filtered_frame);
#endif
        }

fail:
        av_free(buffer_to_free);
        /* XXX: allocate the subtitles in the codec ? */
        if (subtitle_to_free) {
            avsubtitle_free(subtitle_to_free);
            subtitle_to_free = NULL;
        }
        av_freep(&decoded_frame);
        if (ret < 0)
            return ret;
    }
 discard_packet:

    return 0;
}

static void print_sdp(OutputFile *output_files, int n)
{
    char sdp[2048];
    int i;
    AVFormatContext **avc = av_malloc(sizeof(*avc)*n);

    if (!avc)
        exit_program(1);
    for (i = 0; i < n; i++)
        avc[i] = output_files[i].ctx;

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

static int init_input_stream(int ist_index, OutputStream *output_streams, int nb_output_streams,
                             char *error, int error_len)
{
    InputStream *ist = &input_streams[ist_index];
    if (ist->decoding_needed) {
        AVCodec *codec = ist->dec;
        if (!codec) {
            snprintf(error, error_len, "Decoder (codec %s) not found for input stream #%d:%d",
                    avcodec_get_name(ist->st->codec->codec_id), ist->file_index, ist->st->index);
            return AVERROR(EINVAL);
        }
        if (avcodec_open2(ist->st->codec, codec, &ist->opts) < 0) {
            snprintf(error, error_len, "Error while opening decoder for input stream #%d:%d",
                    ist->file_index, ist->st->index);
            return AVERROR(EINVAL);
        }
        assert_codec_experimental(ist->st->codec, 0);
        assert_avoptions(ist->opts);
    }

    ist->pts = ist->st->avg_frame_rate.num ? - ist->st->codec->has_b_frames*AV_TIME_BASE / av_q2d(ist->st->avg_frame_rate) : 0;
    ist->next_pts = AV_NOPTS_VALUE;
    ist->is_start = 1;

    return 0;
}

static int transcode_init(OutputFile *output_files, int nb_output_files,
                          InputFile  *input_files,  int nb_input_files)
{
    int ret = 0, i, j, k;
    AVFormatContext *oc;
    AVCodecContext *codec, *icodec;
    OutputStream *ost;
    InputStream *ist;
    char error[1024];
    int want_sdp = 1;

    /* init framerate emulation */
    for (i = 0; i < nb_input_files; i++) {
        InputFile *ifile = &input_files[i];
        if (ifile->rate_emu)
            for (j = 0; j < ifile->nb_streams; j++)
                input_streams[j + ifile->ist_index].start = av_gettime();
    }

    /* output stream init */
    for (i = 0; i < nb_output_files; i++) {
        oc = output_files[i].ctx;
        if (!oc->nb_streams && !(oc->oformat->flags & AVFMT_NOSTREAMS)) {
            av_dump_format(oc, i, oc->filename, 1);
            av_log(NULL, AV_LOG_ERROR, "Output file #%d does not contain any stream\n", i);
            return AVERROR(EINVAL);
        }
    }

    /* for each output stream, we compute the right encoding parameters */
    for (i = 0; i < nb_output_streams; i++) {
        ost = &output_streams[i];
        oc  = output_files[ost->file_index].ctx;
        ist = &input_streams[ost->source_index];

        if (ost->attachment_filename)
            continue;

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

        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->stream_copy) {
            uint64_t extra_size = (uint64_t)icodec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE;

            if (extra_size > INT_MAX) {
                return AVERROR(EINVAL);
            }

            /* 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 (!oc->oformat->codec_tag ||
                     av_codec_get_id (oc->oformat->codec_tag, icodec->codec_tag) == codec->codec_id ||
                     av_codec_get_tag(oc->oformat->codec_tag, icodec->codec_id) <= 0)
                    codec->codec_tag = icodec->codec_tag;
            }

            codec->bit_rate       = icodec->bit_rate;
            codec->rc_max_rate    = icodec->rc_max_rate;
            codec->rc_buffer_size = icodec->rc_buffer_size;
            codec->extradata      = av_mallocz(extra_size);
            if (!codec->extradata) {
                return AVERROR(ENOMEM);
            }
            memcpy(codec->extradata, icodec->extradata, icodec->extradata_size);
            codec->extradata_size= icodec->extradata_size;

            codec->time_base = ist->st->time_base;
            if(!strcmp(oc->oformat->name, "avi")) {
                if (!copy_tb &&
                    av_q2d(icodec->time_base)*icodec->ticks_per_frame > 2*av_q2d(ist->st->time_base) &&
                    av_q2d(ist->st->time_base) < 1.0/500){
                    codec->time_base = icodec->time_base;
                    codec->time_base.num *= icodec->ticks_per_frame;
                    codec->time_base.den *= 2;
                }
            } else if(!(oc->oformat->flags & AVFMT_VARIABLE_FPS)) {
                if(!copy_tb && av_q2d(icodec->time_base)*icodec->ticks_per_frame > av_q2d(ist->st->time_base) && av_q2d(ist->st->time_base) < 1.0/500){
                    codec->time_base = icodec->time_base;
                    codec->time_base.num *= icodec->ticks_per_frame;
                }
            }
            av_reduce(&codec->time_base.num, &codec->time_base.den,
                        codec->time_base.num, codec->time_base.den, INT_MAX);

            switch(codec->codec_type) {
            case AVMEDIA_TYPE_AUDIO:
                if(audio_volume != 256) {
                    av_log(NULL, AV_LOG_FATAL, "-acodec copy and -vol are incompatible (frames are not decoded)\n");
                    exit_program(1);
                }
                codec->channel_layout     = icodec->channel_layout;
                codec->sample_rate        = icodec->sample_rate;
                codec->channels           = icodec->channels;
                codec->frame_size         = icodec->frame_size;
                codec->audio_service_type = icodec->audio_service_type;
                codec->block_align        = icodec->block_align;
                break;
            case AVMEDIA_TYPE_VIDEO:
                codec->pix_fmt            = icodec->pix_fmt;
                codec->width              = icodec->width;
                codec->height             = icodec->height;
                codec->has_b_frames       = icodec->has_b_frames;
                if (!codec->sample_aspect_ratio.num) {
                    codec->sample_aspect_ratio   =
                    ost->st->sample_aspect_ratio =
                        ist->st->sample_aspect_ratio.num ? ist->st->sample_aspect_ratio :
                        ist->st->codec->sample_aspect_ratio.num ?
                        ist->st->codec->sample_aspect_ratio : (AVRational){0, 1};
                }
                ost->st->avg_frame_rate = ist->st->avg_frame_rate;
                break;
            case AVMEDIA_TYPE_SUBTITLE:
                codec->width  = icodec->width;
                codec->height = icodec->height;
                break;
            case AVMEDIA_TYPE_DATA:
            case AVMEDIA_TYPE_ATTACHMENT:
                break;
            default:
                abort();
            }
        } else {
            if (!ost->enc)
                ost->enc = avcodec_find_encoder(ost->st->codec->codec_id);

            ist->decoding_needed = 1;
            ost->encoding_needed = 1;

            switch(codec->codec_type) {
            case AVMEDIA_TYPE_AUDIO:
                ost->fifo = av_fifo_alloc(1024);
                if (!ost->fifo) {
                    return AVERROR(ENOMEM);
                }
                if (!codec->sample_rate)
                    codec->sample_rate = icodec->sample_rate;
                choose_sample_rate(ost->st, ost->enc);
                codec->time_base = (AVRational){1, codec->sample_rate};

                if (codec->sample_fmt == AV_SAMPLE_FMT_NONE)
                    codec->sample_fmt = icodec->sample_fmt;
                choose_sample_fmt(ost->st, ost->enc);

                if (ost->audio_channels_mapped) {
                    /* the requested output channel is set to the number of
                     * -map_channel only if no -ac are specified */
                    if (!codec->channels) {
                        codec->channels       = ost->audio_channels_mapped;
                        codec->channel_layout = av_get_default_channel_layout(codec->channels);
                        if (!codec->channel_layout) {
                            av_log(NULL, AV_LOG_FATAL, "Unable to find an appropriate channel layout for requested number of channel\n");
                            exit_program(1);
                        }
                    }
                    /* fill unused channel mapping with -1 (which means a muted
                     * channel in case the number of output channels is bigger
                     * than the number of mapped channel) */
                    for (j = ost->audio_channels_mapped; j < FF_ARRAY_ELEMS(ost->audio_channels_map); j++)
                        ost->audio_channels_map[j] = -1;
                } else if (!codec->channels) {
                    codec->channels = icodec->channels;
                    codec->channel_layout = icodec->channel_layout;
                }
                if (av_get_channel_layout_nb_channels(codec->channel_layout) != codec->channels)
                    codec->channel_layout = 0;

                ost->audio_resample       = codec->sample_rate != icodec->sample_rate || audio_sync_method > 1;
                ost->audio_resample      |=    codec->sample_fmt     != icodec->sample_fmt
                                            || codec->channel_layout != icodec->channel_layout;
                icodec->request_channels  = codec->channels;
                ost->resample_sample_fmt  = icodec->sample_fmt;
                ost->resample_sample_rate = icodec->sample_rate;
                ost->resample_channels    = icodec->channels;
                break;
            case AVMEDIA_TYPE_VIDEO:
                if (codec->pix_fmt == PIX_FMT_NONE)
                    codec->pix_fmt = icodec->pix_fmt;
                choose_pixel_fmt(ost->st, ost->enc);

                if (ost->st->codec->pix_fmt == PIX_FMT_NONE) {
                    av_log(NULL, AV_LOG_FATAL, "Video pixel format is unknown, stream cannot be encoded\n");
                    exit_program(1);
                }

                if (!codec->width || !codec->height) {
                    codec->width  = icodec->width;
                    codec->height = icodec->height;
                }

                ost->video_resample = codec->width   != icodec->width  ||
                                      codec->height  != icodec->height ||
                                      codec->pix_fmt != icodec->pix_fmt;
                if (ost->video_resample) {
                    codec->bits_per_raw_sample= frame_bits_per_raw_sample;
                }

                ost->resample_height  = icodec->height;
                ost->resample_width   = icodec->width;
                ost->resample_pix_fmt = icodec->pix_fmt;

                if (!ost->frame_rate.num)
                    ost->frame_rate = ist->st->r_frame_rate.num ? ist->st->r_frame_rate : (AVRational){25,1};
                if (ost->enc && ost->enc->supported_framerates && !ost->force_fps) {
                    int idx = av_find_nearest_q_idx(ost->frame_rate, ost->enc->supported_framerates);
                    ost->frame_rate = ost->enc->supported_framerates[idx];
                }
                codec->time_base = (AVRational){ost->frame_rate.den, ost->frame_rate.num};
                if(   av_q2d(codec->time_base) < 0.001 && video_sync_method
                   && (video_sync_method==1 || (video_sync_method<0 && !(oc->oformat->flags & AVFMT_VARIABLE_FPS)))){
                    av_log(oc, AV_LOG_WARNING, "Frame rate very high for a muxer not effciciently supporting it.\n"
                                               "Please consider specifiying a lower framerate, a different muxer or -vsync 2\n");
                }
                for (j = 0; j < ost->forced_kf_count; j++)
                    ost->forced_kf_pts[j] = av_rescale_q(ost->forced_kf_pts[j],
                                                         AV_TIME_BASE_Q,
                                                         codec->time_base);

#if CONFIG_AVFILTER
                if (configure_video_filters(ist, ost)) {
                    av_log(NULL, AV_LOG_FATAL, "Error opening filters!\n");
                    exit(1);
                }
#endif
                break;
            case AVMEDIA_TYPE_SUBTITLE:
                break;
            default:
                abort();
                break;
            }
            /* two pass mode */
            if (codec->codec_id != CODEC_ID_H264 &&
                (codec->flags & (CODEC_FLAG_PASS1 | CODEC_FLAG_PASS2))) {
                char logfilename[1024];
                FILE *f;

                snprintf(logfilename, sizeof(logfilename), "%s-%d.log",
                         pass_logfilename_prefix ? pass_logfilename_prefix : DEFAULT_PASS_LOGFILENAME_PREFIX,
                         i);
                if (codec->flags & CODEC_FLAG_PASS2) {
                    char  *logbuffer;
                    size_t logbuffer_size;
                    if (cmdutils_read_file(logfilename, &logbuffer, &logbuffer_size) < 0) {
                        av_log(NULL, AV_LOG_FATAL, "Error reading log file '%s' for pass-2 encoding\n",
                               logfilename);
                        exit_program(1);
                    }
                    codec->stats_in = logbuffer;
                }
                if (codec->flags & CODEC_FLAG_PASS1) {
                    f = fopen(logfilename, "wb");
                    if (!f) {
                        av_log(NULL, AV_LOG_FATAL, "Cannot write log file '%s' for pass-1 encoding: %s\n",
                               logfilename, strerror(errno));
                        exit_program(1);
                    }
                    ost->logfile = f;
                }
            }
        }
        if(codec->codec_type == AVMEDIA_TYPE_VIDEO){
            /* maximum video buffer size is 6-bytes per pixel, plus DPX header size (1664)*/
            int size        = codec->width * codec->height;
            bit_buffer_size = FFMAX(bit_buffer_size, 7*size + 10000);
        }
    }

    if (!bit_buffer)
        bit_buffer = av_malloc(bit_buffer_size);
    if (!bit_buffer) {
        av_log(NULL, AV_LOG_ERROR, "Cannot allocate %d bytes output buffer\n",
               bit_buffer_size);
        return AVERROR(ENOMEM);
    }

    /* open each encoder */
    for (i = 0; i < nb_output_streams; i++) {
        ost = &output_streams[i];
        if (ost->encoding_needed) {
            AVCodec      *codec = ost->enc;
            AVCodecContext *dec = input_streams[ost->source_index].st->codec;
            if (!codec) {
                snprintf(error, sizeof(error), "Encoder (codec %s) not found for output stream #%d:%d",
                         avcodec_get_name(ost->st->codec->codec_id), ost->file_index, ost->index);
                ret = AVERROR(EINVAL);
                goto dump_format;
            }
            if (dec->subtitle_header) {
                ost->st->codec->subtitle_header = av_malloc(dec->subtitle_header_size);
                if (!ost->st->codec->subtitle_header) {
                    ret = AVERROR(ENOMEM);
                    goto dump_format;
                }
                memcpy(ost->st->codec->subtitle_header, dec->subtitle_header, dec->subtitle_header_size);
                ost->st->codec->subtitle_header_size = dec->subtitle_header_size;
            }
            if (avcodec_open2(ost->st->codec, codec, &ost->opts) < 0) {
                snprintf(error, sizeof(error), "Error while opening encoder for output stream #%d:%d - maybe incorrect parameters such as bit_rate, rate, width or height",
                        ost->file_index, ost->index);
                ret = AVERROR(EINVAL);
                goto dump_format;
            }
            assert_codec_experimental(ost->st->codec, 1);
            assert_avoptions(ost->opts);
            if (ost->st->codec->bit_rate && ost->st->codec->bit_rate < 1000)
                av_log(NULL, AV_LOG_WARNING, "The bitrate parameter is set too low."
                                             " It takes bits/s as argument, not kbits/s\n");
            extra_size += ost->st->codec->extradata_size;

            if (ost->st->codec->me_threshold)
                input_streams[ost->source_index].st->codec->debug |= FF_DEBUG_MV;
        }
    }

    /* init input streams */
    for (i = 0; i < nb_input_streams; i++)
        if ((ret = init_input_stream(i, output_streams, nb_output_streams, error, sizeof(error))) < 0)
            goto dump_format;

    /* discard unused programs */
    for (i = 0; i < nb_input_files; i++) {
        InputFile *ifile = &input_files[i];
        for (j = 0; j < ifile->ctx->nb_programs; j++) {
            AVProgram *p = ifile->ctx->programs[j];
            int discard  = AVDISCARD_ALL;

            for (k = 0; k < p->nb_stream_indexes; k++)
                if (!input_streams[ifile->ist_index + p->stream_index[k]].discard) {
                    discard = AVDISCARD_DEFAULT;
                    break;
                }
            p->discard = discard;
        }
    }

    /* open files and write file headers */
    for (i = 0; i < nb_output_files; i++) {
        oc = output_files[i].ctx;
        oc->interrupt_callback = int_cb;
        if (avformat_write_header(oc, &output_files[i].opts) < 0) {
            snprintf(error, sizeof(error), "Could not write header for output file #%d (incorrect codec parameters ?)", i);
            ret = AVERROR(EINVAL);
            goto dump_format;
        }
//        assert_avoptions(output_files[i].opts);
        if (strcmp(oc->oformat->name, "rtp")) {
            want_sdp = 0;
        }
    }

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

    /* dump the stream mapping */
    av_log(NULL, AV_LOG_INFO, "Stream mapping:\n");
    for (i = 0; i < nb_output_streams; i++) {
        ost = &output_streams[i];

        if (ost->attachment_filename) {
            /* an attached file */
            av_log(NULL, AV_LOG_INFO, "  File %s -> Stream #%d:%d\n",
                   ost->attachment_filename, ost->file_index, ost->index);
            continue;
        }
        av_log(NULL, AV_LOG_INFO, "  Stream #%d:%d -> #%d:%d",
               input_streams[ost->source_index].file_index,
               input_streams[ost->source_index].st->index,
               ost->file_index,
               ost->index);
        if (ost->audio_channels_mapped) {
            av_log(NULL, AV_LOG_INFO, " [ch:");
            for (j = 0; j < ost->audio_channels_mapped; j++)
                if (ost->audio_channels_map[j] == -1)
                    av_log(NULL, AV_LOG_INFO, " M");
                else
                    av_log(NULL, AV_LOG_INFO, " %d", ost->audio_channels_map[j]);
            av_log(NULL, AV_LOG_INFO, "]");
        }
        if (ost->sync_ist != &input_streams[ost->source_index])
            av_log(NULL, AV_LOG_INFO, " [sync #%d:%d]",
                   ost->sync_ist->file_index,
                   ost->sync_ist->st->index);
        if (ost->stream_copy)
            av_log(NULL, AV_LOG_INFO, " (copy)");
        else
            av_log(NULL, AV_LOG_INFO, " (%s -> %s)", input_streams[ost->source_index].dec ?
                   input_streams[ost->source_index].dec->name : "?",
                   ost->enc ? ost->enc->name : "?");
        av_log(NULL, AV_LOG_INFO, "\n");
    }

    if (ret) {
        av_log(NULL, AV_LOG_ERROR, "%s\n", error);
        return ret;
    }

    if (want_sdp) {
        print_sdp(output_files, nb_output_files);
    }

    return 0;
}

/*
 * The following code is the main loop of the file converter
 */
static int transcode(OutputFile *output_files, int nb_output_files,
                     InputFile  *input_files,  int nb_input_files)
{
    int ret, i;
    AVFormatContext *is, *os;
    OutputStream *ost;
    InputStream *ist;
    uint8_t *no_packet;
    int no_packet_count=0;
    int64_t timer_start;
    int key;

    if (!(no_packet = av_mallocz(nb_input_files)))
        exit_program(1);

    ret = transcode_init(output_files, nb_output_files, input_files, nb_input_files);
    if (ret < 0)
        goto fail;

    if (!using_stdin) {
        av_log(NULL, AV_LOG_INFO, "Press [q] to stop, [?] for help\n");
    }

    timer_start = av_gettime();

    for(; received_sigterm == 0;) {
        int file_index, ist_index;
        AVPacket pkt;
        int64_t ipts_min;
        double opts_min;
        int64_t cur_time= av_gettime();

        ipts_min= INT64_MAX;
        opts_min= 1e100;
        /* if 'q' pressed, exits */
        if (!using_stdin) {
            static int64_t last_time;
            if (received_nb_signals)
                break;
            /* read_key() returns 0 on EOF */
            if(cur_time - last_time >= 100000 && !run_as_daemon){
                key =  read_key();
                last_time = cur_time;
            }else
                key = -1;
            if (key == 'q')
                break;
            if (key == '+') av_log_set_level(av_log_get_level()+10);
            if (key == '-') av_log_set_level(av_log_get_level()-10);
            if (key == 's') qp_hist     ^= 1;
            if (key == 'h'){
                if (do_hex_dump){
                    do_hex_dump = do_pkt_dump = 0;
                } else if(do_pkt_dump){
                    do_hex_dump = 1;
                } else
                    do_pkt_dump = 1;
                av_log_set_level(AV_LOG_DEBUG);
            }
#if CONFIG_AVFILTER
            if (key == 'c' || key == 'C'){
                char buf[4096], target[64], command[256], arg[256] = {0};
                double time;
                int k, n = 0;
                fprintf(stderr, "\nEnter command: <target> <time> <command>[ <argument>]\n");
                i = 0;
                while ((k = read_key()) != '\n' && k != '\r' && i < sizeof(buf)-1)
                    if (k > 0)
                        buf[i++] = k;
                buf[i] = 0;
                if (k > 0 &&
                    (n = sscanf(buf, "%63[^ ] %lf %255[^ ] %255[^\n]", target, &time, command, arg)) >= 3) {
                    av_log(NULL, AV_LOG_DEBUG, "Processing command target:%s time:%f command:%s arg:%s",
                           target, time, command, arg);
                    for (i = 0; i < nb_output_streams; i++) {
                        ost = &output_streams[i];
                        if (ost->graph) {
                            if (time < 0) {
                                ret = avfilter_graph_send_command(ost->graph, target, command, arg, buf, sizeof(buf),
                                                                  key == 'c' ? AVFILTER_CMD_FLAG_ONE : 0);
                                fprintf(stderr, "Command reply for stream %d: ret:%d res:%s\n", i, ret, buf);
                            } else {
                                ret = avfilter_graph_queue_command(ost->graph, target, command, arg, 0, time);
                            }
                        }
                    }
                } else {
                    av_log(NULL, AV_LOG_ERROR,
                           "Parse error, at least 3 arguments were expected, "
                           "only %d given in string '%s'\n", n, buf);
                }
            }
#endif
            if (key == 'd' || key == 'D'){
                int debug=0;
                if(key == 'D') {
                    debug = input_streams[0].st->codec->debug<<1;
                    if(!debug) debug = 1;
                    while(debug & (FF_DEBUG_DCT_COEFF|FF_DEBUG_VIS_QP|FF_DEBUG_VIS_MB_TYPE)) //unsupported, would just crash
                        debug += debug;
                }else
                    if(scanf("%d", &debug)!=1)
                        fprintf(stderr,"error parsing debug value\n");
                for(i=0;i<nb_input_streams;i++) {
                    input_streams[i].st->codec->debug = debug;
                }
                for(i=0;i<nb_output_streams;i++) {
                    ost = &output_streams[i];
                    ost->st->codec->debug = debug;
                }
                if(debug) av_log_set_level(AV_LOG_DEBUG);
                fprintf(stderr,"debug=%d\n", debug);
            }
            if (key == '?'){
                fprintf(stderr, "key    function\n"
                                "?      show this help\n"
                                "+      increase verbosity\n"
                                "-      decrease verbosity\n"
                                "c      Send command to filtergraph\n"
                                "D      cycle through available debug modes\n"
                                "h      dump packets/hex press to cycle through the 3 states\n"
                                "q      quit\n"
                                "s      Show QP histogram\n"
                );
            }
        }

        /* select the stream that we must read now by looking at the
           smallest output pts */
        file_index = -1;
        for (i = 0; i < nb_output_streams; i++) {
            OutputFile *of;
            int64_t ipts;
            double  opts;
            ost = &output_streams[i];
            of = &output_files[ost->file_index];
            os = output_files[ost->file_index].ctx;
            ist = &input_streams[ost->source_index];
            if (ost->is_past_recording_time || no_packet[ist->file_index] ||
                (os->pb && avio_tell(os->pb) >= of->limit_filesize))
                continue;
            opts = ost->st->pts.val * av_q2d(ost->st->time_base);
            ipts = ist->pts;
            if (!input_files[ist->file_index].eof_reached){
                if(ipts < ipts_min) {
                    ipts_min = ipts;
                    if(input_sync ) file_index = ist->file_index;
                }
                if(opts < opts_min) {
                    opts_min = opts;
                    if(!input_sync) file_index = ist->file_index;
                }
            }
            if (ost->frame_number >= ost->max_frames) {
                int j;
                for (j = 0; j < of->ctx->nb_streams; j++)
                    output_streams[of->ost_index + j].is_past_recording_time = 1;
                continue;
            }
        }
        /* if none, if is finished */
        if (file_index < 0) {
            if(no_packet_count){
                no_packet_count=0;
                memset(no_packet, 0, nb_input_files);
                usleep(10000);
                continue;
            }
            break;
        }

        /* read a frame from it and output it in the fifo */
        is = input_files[file_index].ctx;
        ret= av_read_frame(is, &pkt);
        if(ret == AVERROR(EAGAIN)){
            no_packet[file_index]=1;
            no_packet_count++;
            continue;
        }
        if (ret < 0) {
            input_files[file_index].eof_reached = 1;
            if (opt_shortest)
                break;
            else
                continue;
        }

        no_packet_count=0;
        memset(no_packet, 0, nb_input_files);

        if (do_pkt_dump) {
            av_pkt_dump_log2(NULL, AV_LOG_DEBUG, &pkt, do_hex_dump,
                             is->streams[pkt.stream_index]);
        }
        /* the following test is needed in case new streams appear
           dynamically in stream : we ignore them */
        if (pkt.stream_index >= input_files[file_index].nb_streams)
            goto discard_packet;
        ist_index = input_files[file_index].ist_index + pkt.stream_index;
        ist = &input_streams[ist_index];
        if (ist->discard)
            goto discard_packet;

        if (pkt.dts != AV_NOPTS_VALUE)
            pkt.dts += av_rescale_q(input_files[ist->file_index].ts_offset, AV_TIME_BASE_Q, ist->st->time_base);
        if (pkt.pts != AV_NOPTS_VALUE)
            pkt.pts += av_rescale_q(input_files[ist->file_index].ts_offset, AV_TIME_BASE_Q, ist->st->time_base);

        if(pkt.pts != AV_NOPTS_VALUE)
            pkt.pts *= ist->ts_scale;
        if(pkt.dts != AV_NOPTS_VALUE)
            pkt.dts *= ist->ts_scale;

//        fprintf(stderr, "next:%"PRId64" dts:%"PRId64" off:%"PRId64" %d\n", ist->next_pts, pkt.dts, input_files[ist->file_index].ts_offset, ist->st->codec->codec_type);
        if (pkt.dts != AV_NOPTS_VALUE && ist->next_pts != AV_NOPTS_VALUE
            && (is->iformat->flags & AVFMT_TS_DISCONT)) {
            int64_t pkt_dts= av_rescale_q(pkt.dts, ist->st->time_base, AV_TIME_BASE_Q);
            int64_t delta= pkt_dts - ist->next_pts;
            if((delta < -1LL*dts_delta_threshold*AV_TIME_BASE ||
                (delta > 1LL*dts_delta_threshold*AV_TIME_BASE &&
                 ist->st->codec->codec_type != AVMEDIA_TYPE_SUBTITLE) ||
                pkt_dts+1<ist->pts)&& !copy_ts){
                input_files[ist->file_index].ts_offset -= delta;
                av_log(NULL, AV_LOG_DEBUG, "timestamp discontinuity %"PRId64", new offset= %"PRId64"\n",
                       delta, input_files[ist->file_index].ts_offset);
                pkt.dts-= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
                if(pkt.pts != AV_NOPTS_VALUE)
                    pkt.pts-= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
            }
        }

        //fprintf(stderr,"read #%d.%d size=%d\n", ist->file_index, ist->st->index, pkt.size);
        if (output_packet(ist, ist_index, output_streams, nb_output_streams, &pkt) < 0) {

            av_log(NULL, AV_LOG_ERROR, "Error while decoding stream #%d:%d\n",
                   ist->file_index, ist->st->index);
            if (exit_on_error)
                exit_program(1);
            av_free_packet(&pkt);
            continue;
        }

    discard_packet:
        av_free_packet(&pkt);

        /* dump report by using the output first video and audio streams */
        print_report(output_files, output_streams, nb_output_streams, 0, timer_start, cur_time);
    }

    /* at the end of stream, we must flush the decoder buffers */
    for (i = 0; i < nb_input_streams; i++) {
        ist = &input_streams[i];
        if (ist->decoding_needed) {
            output_packet(ist, i, output_streams, nb_output_streams, NULL);
        }
    }
    flush_encoders(output_streams, nb_output_streams);

    term_exit();

    /* write the trailer if needed and close file */
    for(i=0;i<nb_output_files;i++) {
        os = output_files[i].ctx;
        av_write_trailer(os);
    }

    /* dump report by using the first video and audio streams */
    print_report(output_files, output_streams, nb_output_streams, 1, timer_start, av_gettime());

    /* close each encoder */
    for (i = 0; i < nb_output_streams; i++) {
        ost = &output_streams[i];
        if (ost->encoding_needed) {
            av_freep(&ost->st->codec->stats_in);
            avcodec_close(ost->st->codec);
        }
#if CONFIG_AVFILTER
        avfilter_graph_free(&ost->graph);
#endif
    }

    /* close each decoder */
    for (i = 0; i < nb_input_streams; i++) {
        ist = &input_streams[i];
        if (ist->decoding_needed) {
            avcodec_close(ist->st->codec);
        }
    }

    /* finished ! */
    ret = 0;

 fail:
    av_freep(&bit_buffer);
    av_freep(&no_packet);

    if (output_streams) {
        for (i = 0; i < nb_output_streams; i++) {
            ost = &output_streams[i];
            if (ost) {
                if (ost->stream_copy)
                    av_freep(&ost->st->codec->extradata);
                if (ost->logfile) {
                    fclose(ost->logfile);
                    ost->logfile = NULL;
                }
                av_fifo_free(ost->fifo); /* works even if fifo is not
                                             initialized but set to zero */
                av_freep(&ost->st->codec->subtitle_header);
                av_free(ost->resample_frame.data[0]);
                av_free(ost->forced_kf_pts);
                if (ost->video_resample)
                    sws_freeContext(ost->img_resample_ctx);
                swr_free(&ost->swr);
                av_dict_free(&ost->opts);
            }
        }
    }
    return ret;
}

static int opt_frame_crop(const char *opt, const char *arg)
{
    av_log(NULL, AV_LOG_FATAL, "Option '%s' has been removed, use the crop filter instead\n", opt);
    return AVERROR(EINVAL);
}

static int opt_pad(const char *opt, const char *arg)
{
    av_log(NULL, AV_LOG_FATAL, "Option '%s' has been removed, use the pad filter instead\n", opt);
    return -1;
}

static double parse_frame_aspect_ratio(const char *arg)
{
    int x = 0, y = 0;
    double ar = 0;
    const char *p;
    char *end;

    p = strchr(arg, ':');
    if (p) {
        x = strtol(arg, &end, 10);
        if (end == p)
            y = strtol(end+1, &end, 10);
        if (x > 0 && y > 0)
            ar = (double)x / (double)y;
    } else
        ar = strtod(arg, NULL);

    if (!ar) {
        av_log(NULL, AV_LOG_FATAL, "Incorrect aspect ratio specification.\n");
        exit_program(1);
    }
    return ar;
}

static int opt_video_channel(const char *opt, const char *arg)
{
    av_log(NULL, AV_LOG_WARNING, "This option is deprecated, use -channel.\n");
    return opt_default("channel", arg);
}

static int opt_video_standard(const char *opt, const char *arg)
{
    av_log(NULL, AV_LOG_WARNING, "This option is deprecated, use -standard.\n");
    return opt_default("standard", arg);
}

static int opt_audio_codec(OptionsContext *o, const char *opt, const char *arg)
{
    audio_codec_name = arg;
    return parse_option(o, "codec:a", arg, options);
}

static int opt_video_codec(OptionsContext *o, const char *opt, const char *arg)
{
    video_codec_name = arg;
    return parse_option(o, "codec:v", arg, options);
}

static int opt_subtitle_codec(OptionsContext *o, const char *opt, const char *arg)
{
    subtitle_codec_name = arg;
    return parse_option(o, "codec:s", arg, options);
}

static int opt_data_codec(OptionsContext *o, const char *opt, const char *arg)
{
    return parse_option(o, "codec:d", arg, options);
}

static int opt_map(OptionsContext *o, const char *opt, const char *arg)
{
    StreamMap *m = NULL;
    int i, negative = 0, file_idx;
    int sync_file_idx = -1, sync_stream_idx;
    char *p, *sync;
    char *map;

    if (*arg == '-') {
        negative = 1;
        arg++;
    }
    map = av_strdup(arg);

    /* parse sync stream first, just pick first matching stream */
    if (sync = strchr(map, ',')) {
        *sync = 0;
        sync_file_idx = strtol(sync + 1, &sync, 0);
        if (sync_file_idx >= nb_input_files || sync_file_idx < 0) {
            av_log(NULL, AV_LOG_FATAL, "Invalid sync file index: %d.\n", sync_file_idx);
            exit_program(1);
        }
        if (*sync)
            sync++;
        for (i = 0; i < input_files[sync_file_idx].nb_streams; i++)
            if (check_stream_specifier(input_files[sync_file_idx].ctx,
                                       input_files[sync_file_idx].ctx->streams[i], sync) == 1) {
                sync_stream_idx = i;
                break;
            }
        if (i == input_files[sync_file_idx].nb_streams) {
            av_log(NULL, AV_LOG_FATAL, "Sync stream specification in map %s does not "
                                       "match any streams.\n", arg);
            exit_program(1);
        }
    }


    file_idx = strtol(map, &p, 0);
    if (file_idx >= nb_input_files || file_idx < 0) {
        av_log(NULL, AV_LOG_FATAL, "Invalid input file index: %d.\n", file_idx);
        exit_program(1);
    }
    if (negative)
        /* disable some already defined maps */
        for (i = 0; i < o->nb_stream_maps; i++) {
            m = &o->stream_maps[i];
            if (file_idx == m->file_index &&
                check_stream_specifier(input_files[m->file_index].ctx,
                                       input_files[m->file_index].ctx->streams[m->stream_index],
                                       *p == ':' ? p + 1 : p) > 0)
                m->disabled = 1;
        }
    else
        for (i = 0; i < input_files[file_idx].nb_streams; i++) {
            if (check_stream_specifier(input_files[file_idx].ctx, input_files[file_idx].ctx->streams[i],
                        *p == ':' ? p + 1 : p) <= 0)
                continue;
            o->stream_maps = grow_array(o->stream_maps, sizeof(*o->stream_maps),
                                        &o->nb_stream_maps, o->nb_stream_maps + 1);
            m = &o->stream_maps[o->nb_stream_maps - 1];

            m->file_index   = file_idx;
            m->stream_index = i;

            if (sync_file_idx >= 0) {
                m->sync_file_index   = sync_file_idx;
                m->sync_stream_index = sync_stream_idx;
            } else {
                m->sync_file_index   = file_idx;
                m->sync_stream_index = i;
            }
        }

    if (!m) {
        av_log(NULL, AV_LOG_FATAL, "Stream map '%s' matches no streams.\n", arg);
        exit_program(1);
    }

    av_freep(&map);
    return 0;
}

static int opt_attach(OptionsContext *o, const char *opt, const char *arg)
{
    o->attachments = grow_array(o->attachments, sizeof(*o->attachments),
                                &o->nb_attachments, o->nb_attachments + 1);
    o->attachments[o->nb_attachments - 1] = arg;
    return 0;
}

static int opt_map_channel(OptionsContext *o, const char *opt, const char *arg)
{
    int n;
    AVStream *st;
    AudioChannelMap *m;

    o->audio_channel_maps =
        grow_array(o->audio_channel_maps, sizeof(*o->audio_channel_maps),
                   &o->nb_audio_channel_maps, o->nb_audio_channel_maps + 1);
    m = &o->audio_channel_maps[o->nb_audio_channel_maps - 1];

    /* muted channel syntax */
    n = sscanf(arg, "%d:%d.%d", &m->channel_idx, &m->ofile_idx, &m->ostream_idx);
    if ((n == 1 || n == 3) && m->channel_idx == -1) {
        m->file_idx = m->stream_idx = -1;
        if (n == 1)
            m->ofile_idx = m->ostream_idx = -1;
        return 0;
    }

    /* normal syntax */
    n = sscanf(arg, "%d.%d.%d:%d.%d",
               &m->file_idx,  &m->stream_idx, &m->channel_idx,
               &m->ofile_idx, &m->ostream_idx);

    if (n != 3 && n != 5) {
        av_log(NULL, AV_LOG_FATAL, "Syntax error, mapchan usage: "
               "[file.stream.channel|-1][:syncfile:syncstream]\n");
        exit_program(1);
    }