ffmpeg.c

    return -10.0 * log(d) / log(10.0);
}

static void do_video_stats(OutputStream *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");
            exit(1);
        }
    }

    enc = ost->st->codec;
    if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
        frame_number = ost->st->nb_frames;
        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->st->pts.val * 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_picture_type_char(enc->coded_frame->pict_type));
    }
}

/**
 * Get and encode new output from any of the filtergraphs, without causing
 * activity.
 *
 * @return  0 for success, <0 for severe errors
 */
static int reap_filters(void)
{
    AVFrame *filtered_frame = NULL;
    int i;
    int64_t frame_pts;

    /* Reap all buffers present in the buffer sinks */
    for (i = 0; i < nb_output_streams; i++) {
        OutputStream *ost = output_streams[i];
        OutputFile    *of = output_files[ost->file_index];
        int ret = 0;

        if (!ost->filter)
            continue;

        if (!ost->filtered_frame && !(ost->filtered_frame = avcodec_alloc_frame())) {
            return AVERROR(ENOMEM);
        } else
            avcodec_get_frame_defaults(ost->filtered_frame);
        filtered_frame = ost->filtered_frame;

        while (1) {
            ret = av_buffersink_get_frame_flags(ost->filter->filter, filtered_frame,
                                               AV_BUFFERSINK_FLAG_NO_REQUEST);
            if (ret < 0) {
                if (ret != AVERROR(EAGAIN) && ret != AVERROR_EOF) {
                    av_log(NULL, AV_LOG_WARNING,
                           "Error in av_buffersink_get_frame_flags(): %s\n", av_err2str(ret));
                }
                break;
            }
            frame_pts = AV_NOPTS_VALUE;
            if (filtered_frame->pts != AV_NOPTS_VALUE) {
                filtered_frame->pts = frame_pts = av_rescale_q(filtered_frame->pts,
                                                ost->filter->filter->inputs[0]->time_base,
                                                ost->st->codec->time_base) -
                                    av_rescale_q(of->start_time,
                                                AV_TIME_BASE_Q,
                                                ost->st->codec->time_base);
            }
            //if (ost->source_index >= 0)
            //    *filtered_frame= *input_streams[ost->source_index]->decoded_frame; //for me_threshold


            switch (ost->filter->filter->inputs[0]->type) {
            case AVMEDIA_TYPE_VIDEO:
                filtered_frame->pts = frame_pts;
                if (!ost->frame_aspect_ratio.num)
                    ost->st->codec->sample_aspect_ratio = filtered_frame->sample_aspect_ratio;

                do_video_out(of->ctx, ost, filtered_frame);
                break;
            case AVMEDIA_TYPE_AUDIO:
                filtered_frame->pts = frame_pts;
                if (!(ost->st->codec->codec->capabilities & CODEC_CAP_PARAM_CHANGE) &&
                    ost->st->codec->channels != av_frame_get_channels(filtered_frame)) {
                    av_log(NULL, AV_LOG_ERROR,
                           "Audio filter graph output is not normalized and encoder does not support parameter changes\n");
                    break;
                }
                do_audio_out(of->ctx, ost, filtered_frame);
                break;
            default:
                // TODO support subtitle filters
                av_assert0(0);
            }

            av_frame_unref(filtered_frame);
        }
    }

    return 0;
}

static void print_report(int is_last_report, int64_t timer_start, int64_t cur_time)
{
    char buf[1024];
    AVBPrint buf_script;
    OutputStream *ost;
    AVFormatContext *oc;
    int64_t total_size;
    AVCodecContext *enc;
    int frame_number, vid, i;
    double bitrate;
    int64_t pts = INT64_MIN;
    static int64_t last_time = -1;
    static int qp_histogram[52];
    int hours, mins, secs, us;

    if (!print_stats && !is_last_report && !progress_avio)
        return;

    if (!is_last_report) {
        if (last_time == -1) {
            last_time = cur_time;
            return;
        }
        if ((cur_time - last_time) < 500000)
            return;
        last_time = cur_time;
    }


    oc = output_files[0]->ctx;

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

    buf[0] = '\0';
    vid = 0;
    av_bprint_init(&buf_script, 0, 1);
    for (i = 0; i < nb_output_streams; i++) {
        float q = -1;
        ost = output_streams[i];
        enc = ost->st->codec;
        if (!ost->stream_copy && enc->coded_frame)
            q = enc->coded_frame->quality / (float)FF_QP2LAMBDA;
        if (vid && enc->codec_type == AVMEDIA_TYPE_VIDEO) {
            snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "q=%2.1f ", q);
            av_bprintf(&buf_script, "stream_%d_%d_q=%.1f\n",
                       ost->file_index, ost->index, q);
        }
        if (!vid && enc->codec_type == AVMEDIA_TYPE_VIDEO) {
            float fps, t = (cur_time-timer_start) / 1000000.0;

            frame_number = ost->frame_number;
            fps = t > 1 ? frame_number / t : 0;
            snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "frame=%5d fps=%3.*f q=%3.1f ",
                     frame_number, fps < 9.95, fps, q);
            av_bprintf(&buf_script, "frame=%d\n", frame_number);
            av_bprintf(&buf_script, "fps=%.1f\n", fps);
            av_bprintf(&buf_script, "stream_%d_%d_q=%.1f\n",
                       ost->file_index, ost->index, q);
            if (is_last_report)
                snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "L");
            if (qp_hist) {
                int j;
                int qp = lrintf(q);
                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(log2(qp_histogram[j] + 1)));
            }
            if ((enc->flags&CODEC_FLAG_PSNR) && (enc->coded_frame || is_last_report)) {
                int j;
                double error, error_sum = 0;
                double scale, scale_sum = 0;
                double p;
                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;
                    p = psnr(error / scale);
                    snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%c:%2.2f ", type[j], p);
                    av_bprintf(&buf_script, "stream_%d_%d_psnr_%c=%2.2f\n",
                               ost->file_index, ost->index, type[j] | 32, p);
                }
                p = psnr(error_sum / scale_sum);
                snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "*:%2.2f ", psnr(error_sum / scale_sum));
                av_bprintf(&buf_script, "stream_%d_%d_psnr_all=%2.2f\n",
                           ost->file_index, ost->index, p);
            }
            vid = 1;
        }
        /* compute min output value */
        if ((is_last_report || !ost->finished) && ost->st->pts.val != AV_NOPTS_VALUE)
            pts = FFMAX(pts, av_rescale_q(ost->st->pts.val,
                                          ost->st->time_base, AV_TIME_BASE_Q));
    }

    secs = pts / AV_TIME_BASE;
    us = pts % AV_TIME_BASE;
    mins = secs / 60;
    secs %= 60;
    hours = mins / 60;
    mins %= 60;

    bitrate = pts && total_size >= 0 ? total_size * 8 / (pts / 1000.0) : -1;

    if (total_size < 0) snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
                                 "size=N/A time=");
    else                snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
                                 "size=%8.0fkB time=", total_size / 1024.0);
    snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
             "%02d:%02d:%02d.%02d ", hours, mins, secs,
             (100 * us) / AV_TIME_BASE);
    if (bitrate < 0) snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
                              "bitrate=N/A");
    else             snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
                              "bitrate=%6.1fkbits/s", bitrate);
    if (total_size < 0) av_bprintf(&buf_script, "total_size=N/A\n");
    else                av_bprintf(&buf_script, "total_size=%"PRId64"\n", total_size);
    av_bprintf(&buf_script, "out_time_ms=%"PRId64"\n", pts);
    av_bprintf(&buf_script, "out_time=%02d:%02d:%02d.%06d\n",
               hours, mins, secs, us);

    if (nb_frames_dup || nb_frames_drop)
        snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " dup=%d drop=%d",
                nb_frames_dup, nb_frames_drop);
    av_bprintf(&buf_script, "dup_frames=%d\n", nb_frames_dup);
    av_bprintf(&buf_script, "drop_frames=%d\n", nb_frames_drop);

    if (print_stats || is_last_report) {
        if (print_stats==1 && AV_LOG_INFO > av_log_get_level()) {
            fprintf(stderr, "%s    \r", buf);
        } else
            av_log(NULL, AV_LOG_INFO, "%s    \r", buf);

    fflush(stderr);
    }

    if (progress_avio) {
        av_bprintf(&buf_script, "progress=%s\n",
                   is_last_report ? "end" : "continue");
        avio_write(progress_avio, buf_script.str,
                   FFMIN(buf_script.len, buf_script.size - 1));
        avio_flush(progress_avio);
        av_bprint_finalize(&buf_script, NULL);
        if (is_last_report) {
            avio_close(progress_avio);
            progress_avio = NULL;
        }
    }

    if (is_last_report) {
        int64_t raw= audio_size + video_size + subtitle_size + extra_size;
        av_log(NULL, AV_LOG_INFO, "\n");
        av_log(NULL, AV_LOG_INFO, "video:%1.0fkB audio:%1.0fkB subtitle:%1.0f global headers:%1.0fkB muxing overhead %f%%\n",
               video_size / 1024.0,
               audio_size / 1024.0,
               subtitle_size / 1024.0,
               extra_size / 1024.0,
               100.0 * (total_size - raw) / raw
        );
        if(video_size + audio_size + subtitle_size + extra_size == 0){
            av_log(NULL, AV_LOG_WARNING, "Output file is empty, nothing was encoded (check -ss / -t / -frames parameters if used)\n");
        }
    }
}

static void flush_encoders(void)
{
    int i, ret;

    for (i = 0; i < nb_output_streams; i++) {
        OutputStream   *ost = output_streams[i];
        AVCodecContext *enc = ost->st->codec;
        AVFormatContext *os = output_files[ost->file_index]->ctx;
        int stop_encoding = 0;

        if (!ost->encoding_needed)
            continue;

        if (ost->st->codec->codec_type == AVMEDIA_TYPE_AUDIO && enc->frame_size <= 1)
            continue;
        if (ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (os->oformat->flags & AVFMT_RAWPICTURE) && enc->codec->id == AV_CODEC_ID_RAWVIDEO)
            continue;

        for (;;) {
            int (*encode)(AVCodecContext*, AVPacket*, const AVFrame*, int*) = NULL;
            const char *desc;
            int64_t *size;

            switch (ost->st->codec->codec_type) {
            case AVMEDIA_TYPE_AUDIO:
                encode = avcodec_encode_audio2;
                desc   = "Audio";
                size   = &audio_size;
                break;
            case AVMEDIA_TYPE_VIDEO:
                encode = avcodec_encode_video2;
                desc   = "Video";
                size   = &video_size;
                break;
            default:
                stop_encoding = 1;
            }

            if (encode) {
                AVPacket pkt;
                int got_packet;
                av_init_packet(&pkt);
                pkt.data = NULL;
                pkt.size = 0;

                update_benchmark(NULL);
                ret = encode(enc, &pkt, NULL, &got_packet);
                update_benchmark("flush %s %d.%d", desc, ost->file_index, ost->index);
                if (ret < 0) {
                    av_log(NULL, AV_LOG_FATAL, "%s encoding failed\n", desc);
                    exit(1);
                }
                *size += pkt.size;
                if (ost->logfile && enc->stats_out) {
                    fprintf(ost->logfile, "%s", enc->stats_out);
                }
                if (!got_packet) {
                    stop_encoding = 1;
                    break;
                }
                if (pkt.pts != AV_NOPTS_VALUE)
                    pkt.pts = av_rescale_q(pkt.pts, enc->time_base, ost->st->time_base);
                if (pkt.dts != AV_NOPTS_VALUE)
                    pkt.dts = av_rescale_q(pkt.dts, enc->time_base, ost->st->time_base);
                if (pkt.duration > 0)
                    pkt.duration = av_rescale_q(pkt.duration, enc->time_base, ost->st->time_base);
                write_frame(os, &pkt, ost);
                if (ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO && vstats_filename) {
                    do_video_stats(ost, pkt.size);
                }
            }

            if (stop_encoding)
                break;
        }
    }
}

/*
 * Check whether a packet from ist should be written into ost at this time
 */
static int check_output_constraints(InputStream *ist, OutputStream *ost)
{
    OutputFile *of = output_files[ost->file_index];
    int ist_index  = input_files[ist->file_index]->ist_index + ist->st->index;

    if (ost->source_index != ist_index)
        return 0;

    if (of->start_time && ist->pts < of->start_time)
        return 0;

    return 1;
}

static void do_streamcopy(InputStream *ist, OutputStream *ost, const AVPacket *pkt)
{
    OutputFile *of = output_files[ost->file_index];
    int64_t ost_tb_start_time = av_rescale_q(of->start_time, AV_TIME_BASE_Q, ost->st->time_base);
    AVPicture pict;
    AVPacket opkt;

    av_init_packet(&opkt);

    if ((!ost->frame_number && !(pkt->flags & AV_PKT_FLAG_KEY)) &&
        !ost->copy_initial_nonkeyframes)
        return;

    if (!ost->frame_number && ist->pts < of->start_time &&
        !ost->copy_prior_start)
        return;

    if (of->recording_time != INT64_MAX &&
        ist->pts >= of->recording_time + of->start_time) {
        close_output_stream(ost);
        return;
    }

    /* force the input stream PTS */
    if (ost->st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
        audio_size += pkt->size;
    else if (ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
        video_size += pkt->size;
        ost->sync_opts++;
    } else if (ost->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
        subtitle_size += pkt->size;
    }

    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->dts, 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;

    if (ost->st->codec->codec_type == AVMEDIA_TYPE_AUDIO && pkt->dts != AV_NOPTS_VALUE) {
        int duration = av_get_audio_frame_duration(ist->st->codec, pkt->size);
        if(!duration)
            duration = ist->st->codec->frame_size;
        opkt.dts = opkt.pts = av_rescale_delta(ist->st->time_base, pkt->dts,
                                               (AVRational){1, ist->st->codec->sample_rate}, duration, &ist->filter_in_rescale_delta_last,
                                               ost->st->time_base) - 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 != AV_CODEC_ID_H264
       && ost->st->codec->codec_id != AV_CODEC_ID_MPEG1VIDEO
       && ost->st->codec->codec_id != AV_CODEC_ID_MPEG2VIDEO
       && ost->st->codec->codec_id != AV_CODEC_ID_VC1
       ) {
        if (av_parser_change(ist->st->parser, ost->st->codec, &opkt.data, &opkt.size, pkt->data, pkt->size, pkt->flags & AV_PKT_FLAG_KEY)) {
            opkt.buf = av_buffer_create(opkt.data, opkt.size, av_buffer_default_free, NULL, 0);
            if (!opkt.buf)
                exit(1);
        }
    } else {
        opkt.data = pkt->data;
        opkt.size = pkt->size;
    }

    if (ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (of->ctx->oformat->flags & AVFMT_RAWPICTURE)) {
        /* store AVPicture in AVPacket, as expected by the output format */
        avpicture_fill(&pict, opkt.data, ost->st->codec->pix_fmt, ost->st->codec->width, ost->st->codec->height);
        opkt.data = (uint8_t *)&pict;
        opkt.size = sizeof(AVPicture);
        opkt.flags |= AV_PKT_FLAG_KEY;
    }

    write_frame(of->ctx, &opkt, ost);
    ost->st->codec->frame_number++;
}

int guess_input_channel_layout(InputStream *ist)
{
    AVCodecContext *dec = ist->st->codec;

    if (!dec->channel_layout) {
        char layout_name[256];

        if (dec->channels > ist->guess_layout_max)
            return 0;
        dec->channel_layout = av_get_default_channel_layout(dec->channels);
        if (!dec->channel_layout)
            return 0;
        av_get_channel_layout_string(layout_name, sizeof(layout_name),
                                     dec->channels, dec->channel_layout);
        av_log(NULL, AV_LOG_WARNING, "Guessed Channel Layout for  Input Stream "
               "#%d.%d : %s\n", ist->file_index, ist->st->index, layout_name);
    }
    return 1;
}

static int decode_audio(InputStream *ist, AVPacket *pkt, int *got_output)
{
    AVFrame *decoded_frame, *f;
    AVCodecContext *avctx = ist->st->codec;
    int i, ret, err = 0, resample_changed;
    AVRational decoded_frame_tb;

    if (!ist->decoded_frame && !(ist->decoded_frame = avcodec_alloc_frame()))
        return AVERROR(ENOMEM);
    if (!ist->filter_frame && !(ist->filter_frame = av_frame_alloc()))
        return AVERROR(ENOMEM);
    decoded_frame = ist->decoded_frame;

    update_benchmark(NULL);
    ret = avcodec_decode_audio4(avctx, decoded_frame, got_output, pkt);
    update_benchmark("decode_audio %d.%d", ist->file_index, ist->st->index);

    if (ret >= 0 && avctx->sample_rate <= 0) {
        av_log(avctx, AV_LOG_ERROR, "Sample rate %d invalid\n", avctx->sample_rate);
        ret = AVERROR_INVALIDDATA;
    }

    if (*got_output || ret<0 || pkt->size)
        decode_error_stat[ret<0] ++;

    if (!*got_output || ret < 0) {
        if (!pkt->size) {
            for (i = 0; i < ist->nb_filters; i++)
#if 1
                av_buffersrc_add_ref(ist->filters[i]->filter, NULL, 0);
#else
                av_buffersrc_add_frame(ist->filters[i]->filter, NULL);
#endif
        }
        return ret;
    }

#if 1
    /* increment next_dts to use for the case where the input stream does not
       have timestamps or there are multiple frames in the packet */
    ist->next_pts += ((int64_t)AV_TIME_BASE * decoded_frame->nb_samples) /
                     avctx->sample_rate;
    ist->next_dts += ((int64_t)AV_TIME_BASE * decoded_frame->nb_samples) /
                     avctx->sample_rate;
#endif

    resample_changed = ist->resample_sample_fmt     != decoded_frame->format         ||
                       ist->resample_channels       != avctx->channels               ||
                       ist->resample_channel_layout != decoded_frame->channel_layout ||
                       ist->resample_sample_rate    != decoded_frame->sample_rate;
    if (resample_changed) {
        char layout1[64], layout2[64];

        if (!guess_input_channel_layout(ist)) {
            av_log(NULL, AV_LOG_FATAL, "Unable to find default channel "
                   "layout for Input Stream #%d.%d\n", ist->file_index,
                   ist->st->index);
            exit(1);
        }
        decoded_frame->channel_layout = avctx->channel_layout;

        av_get_channel_layout_string(layout1, sizeof(layout1), ist->resample_channels,
                                     ist->resample_channel_layout);
        av_get_channel_layout_string(layout2, sizeof(layout2), avctx->channels,
                                     decoded_frame->channel_layout);

        av_log(NULL, AV_LOG_INFO,
               "Input stream #%d:%d frame changed from rate:%d fmt:%s ch:%d chl:%s to rate:%d fmt:%s ch:%d chl:%s\n",
               ist->file_index, ist->st->index,
               ist->resample_sample_rate,  av_get_sample_fmt_name(ist->resample_sample_fmt),
               ist->resample_channels, layout1,
               decoded_frame->sample_rate, av_get_sample_fmt_name(decoded_frame->format),
               avctx->channels, layout2);

        ist->resample_sample_fmt     = decoded_frame->format;
        ist->resample_sample_rate    = decoded_frame->sample_rate;
        ist->resample_channel_layout = decoded_frame->channel_layout;
        ist->resample_channels       = avctx->channels;

        for (i = 0; i < nb_filtergraphs; i++)
            if (ist_in_filtergraph(filtergraphs[i], ist)) {
                FilterGraph *fg = filtergraphs[i];
                int j;
                if (configure_filtergraph(fg) < 0) {
                    av_log(NULL, AV_LOG_FATAL, "Error reinitializing filters!\n");
                    exit(1);
                }
                for (j = 0; j < fg->nb_outputs; j++) {
                    OutputStream *ost = fg->outputs[j]->ost;
                    if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
                        !(ost->enc->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE))
                        av_buffersink_set_frame_size(ost->filter->filter,
                                                     ost->st->codec->frame_size);
                }
            }
    }

    /* if the decoder provides a pts, use it instead of the last packet pts.
       the decoder could be delaying output by a packet or more. */
    if (decoded_frame->pts != AV_NOPTS_VALUE) {
        ist->dts = ist->next_dts = ist->pts = ist->next_pts = av_rescale_q(decoded_frame->pts, avctx->time_base, AV_TIME_BASE_Q);
        decoded_frame_tb   = avctx->time_base;
    } else if (decoded_frame->pkt_pts != AV_NOPTS_VALUE) {
        decoded_frame->pts = decoded_frame->pkt_pts;
        pkt->pts           = AV_NOPTS_VALUE;
        decoded_frame_tb   = ist->st->time_base;
    } else if (pkt->pts != AV_NOPTS_VALUE) {
        decoded_frame->pts = pkt->pts;
        pkt->pts           = AV_NOPTS_VALUE;
        decoded_frame_tb   = ist->st->time_base;
    }else {
        decoded_frame->pts = ist->dts;
        decoded_frame_tb   = AV_TIME_BASE_Q;
    }
    if (decoded_frame->pts != AV_NOPTS_VALUE)
        decoded_frame->pts = av_rescale_delta(decoded_frame_tb, decoded_frame->pts,
                                              (AVRational){1, ist->st->codec->sample_rate}, decoded_frame->nb_samples, &ist->filter_in_rescale_delta_last,
                                              (AVRational){1, ist->st->codec->sample_rate});
    for (i = 0; i < ist->nb_filters; i++) {
        if (i < ist->nb_filters - 1) {
            f = ist->filter_frame;
            err = av_frame_ref(f, decoded_frame);
            if (err < 0)
                break;
        } else
            f = decoded_frame;
        err = av_buffersrc_add_frame_flags(ist->filters[i]->filter, f,
                                     AV_BUFFERSRC_FLAG_PUSH);
        if (err < 0)
            break;
    }
    decoded_frame->pts = AV_NOPTS_VALUE;

    av_frame_unref(ist->filter_frame);
    av_frame_unref(decoded_frame);
    return err < 0 ? err : ret;
}

static int decode_video(InputStream *ist, AVPacket *pkt, int *got_output)
{
    AVFrame *decoded_frame, *f;
    void *buffer_to_free = NULL;
    int i, ret = 0, err = 0, resample_changed;
    int64_t best_effort_timestamp;
    AVRational *frame_sample_aspect;

    if (!ist->decoded_frame && !(ist->decoded_frame = av_frame_alloc()))
        return AVERROR(ENOMEM);
    if (!ist->filter_frame && !(ist->filter_frame = av_frame_alloc()))
        return AVERROR(ENOMEM);
    decoded_frame = ist->decoded_frame;
    pkt->dts  = av_rescale_q(ist->dts, AV_TIME_BASE_Q, ist->st->time_base);

    update_benchmark(NULL);
    ret = avcodec_decode_video2(ist->st->codec,
                                decoded_frame, got_output, pkt);
    update_benchmark("decode_video %d.%d", ist->file_index, ist->st->index);

    if (*got_output || ret<0 || pkt->size)
        decode_error_stat[ret<0] ++;

    if (!*got_output || ret < 0) {
        if (!pkt->size) {
            for (i = 0; i < ist->nb_filters; i++)
#if 1
                av_buffersrc_add_ref(ist->filters[i]->filter, NULL, 0);
#else
                av_buffersrc_add_frame(ist->filters[i]->filter, NULL);
#endif
        }
        return ret;
    }

    if(ist->top_field_first>=0)
        decoded_frame->top_field_first = ist->top_field_first;

    best_effort_timestamp= av_frame_get_best_effort_timestamp(decoded_frame);
    if(best_effort_timestamp != AV_NOPTS_VALUE)
        ist->next_pts = ist->pts = av_rescale_q(decoded_frame->pts = best_effort_timestamp, ist->st->time_base, AV_TIME_BASE_Q);

    if (debug_ts) {
        av_log(NULL, AV_LOG_INFO, "decoder -> ist_index:%d type:video "
                "frame_pts:%s frame_pts_time:%s best_effort_ts:%"PRId64" best_effort_ts_time:%s keyframe:%d frame_type:%d \n",
                ist->st->index, av_ts2str(decoded_frame->pts),
                av_ts2timestr(decoded_frame->pts, &ist->st->time_base),
                best_effort_timestamp,
                av_ts2timestr(best_effort_timestamp, &ist->st->time_base),
                decoded_frame->key_frame, decoded_frame->pict_type);
    }

    pkt->size = 0;

    if (ist->st->sample_aspect_ratio.num)
        decoded_frame->sample_aspect_ratio = ist->st->sample_aspect_ratio;

    resample_changed = ist->resample_width   != decoded_frame->width  ||
                       ist->resample_height  != decoded_frame->height ||
                       ist->resample_pix_fmt != decoded_frame->format;
    if (resample_changed) {
        av_log(NULL, AV_LOG_INFO,
               "Input stream #%d:%d frame changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s\n",
               ist->file_index, ist->st->index,
               ist->resample_width,  ist->resample_height,  av_get_pix_fmt_name(ist->resample_pix_fmt),
               decoded_frame->width, decoded_frame->height, av_get_pix_fmt_name(decoded_frame->format));

        ist->resample_width   = decoded_frame->width;
        ist->resample_height  = decoded_frame->height;
        ist->resample_pix_fmt = decoded_frame->format;

        for (i = 0; i < nb_filtergraphs; i++) {
            if (ist_in_filtergraph(filtergraphs[i], ist) && ist->reinit_filters &&
                configure_filtergraph(filtergraphs[i]) < 0) {
                av_log(NULL, AV_LOG_FATAL, "Error reinitializing filters!\n");
                exit(1);
            }
        }
    }

    frame_sample_aspect= av_opt_ptr(avcodec_get_frame_class(), decoded_frame, "sample_aspect_ratio");
    for (i = 0; i < ist->nb_filters; i++) {
        if (!frame_sample_aspect->num)
            *frame_sample_aspect = ist->st->sample_aspect_ratio;

        if (i < ist->nb_filters - 1) {
            f = ist->filter_frame;
            err = av_frame_ref(f, decoded_frame);
            if (err < 0)
                break;
        } else
            f = decoded_frame;
        ret = av_buffersrc_add_frame_flags(ist->filters[i]->filter, f, AV_BUFFERSRC_FLAG_PUSH);
        if (ret < 0) {
            av_log(NULL, AV_LOG_FATAL,
                   "Failed to inject frame into filter network: %s\n", av_err2str(ret));
            exit(1);
        }
    }

    av_frame_unref(ist->filter_frame);
    av_frame_unref(decoded_frame);
    av_free(buffer_to_free);
    return err < 0 ? err : ret;
}

static int transcode_subtitles(InputStream *ist, AVPacket *pkt, int *got_output)
{
    AVSubtitle subtitle;
    int i, ret = avcodec_decode_subtitle2(ist->st->codec,
                                          &subtitle, got_output, pkt);

    if (*got_output || ret<0 || pkt->size)
        decode_error_stat[ret<0] ++;

    if (ret < 0 || !*got_output) {
        if (!pkt->size)
            sub2video_flush(ist);
        return ret;
    }

    if (ist->fix_sub_duration) {
        if (ist->prev_sub.got_output) {
            int end = av_rescale(subtitle.pts - ist->prev_sub.subtitle.pts,
                                 1000, AV_TIME_BASE);
            if (end < ist->prev_sub.subtitle.end_display_time) {
                av_log(ist->st->codec, AV_LOG_DEBUG,
                       "Subtitle duration reduced from %d to %d\n",
                       ist->prev_sub.subtitle.end_display_time, end);
                ist->prev_sub.subtitle.end_display_time = end;
            }
        }
        FFSWAP(int,        *got_output, ist->prev_sub.got_output);
        FFSWAP(int,        ret,         ist->prev_sub.ret);
        FFSWAP(AVSubtitle, subtitle,    ist->prev_sub.subtitle);
    }

    sub2video_update(ist, &subtitle);

    if (!*got_output || !subtitle.num_rects)
        return ret;

    for (i = 0; i < nb_output_streams; i++) {
        OutputStream *ost = output_streams[i];

        if (!check_output_constraints(ist, ost) || !ost->encoding_needed)
            continue;

        do_subtitle_out(output_files[ost->file_index]->ctx, ost, ist, &subtitle);
    }

    avsubtitle_free(&subtitle);
    return ret;
}

/* pkt = NULL means EOF (needed to flush decoder buffers) */
static int output_packet(InputStream *ist, const AVPacket *pkt)
{
    int ret = 0, i;
    int got_output = 0;

    AVPacket avpkt;
    if (!ist->saw_first_ts) {
        ist->dts = ist->st->avg_frame_rate.num ? - ist->st->codec->has_b_frames * AV_TIME_BASE / av_q2d(ist->st->avg_frame_rate) : 0;
        ist->pts = 0;
        if (pkt != NULL && pkt->pts != AV_NOPTS_VALUE && !ist->decoding_needed) {
            ist->dts += av_rescale_q(pkt->pts, ist->st->time_base, AV_TIME_BASE_Q);
            ist->pts = ist->dts; //unused but better to set it to a value thats not totally wrong
        }
        ist->saw_first_ts = 1;
    }

    if (ist->next_dts == AV_NOPTS_VALUE)
        ist->next_dts = ist->dts;
    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_dts = ist->dts = av_rescale_q(pkt->dts, ist->st->time_base, AV_TIME_BASE_Q);
        if (ist->st->codec->codec_type != AVMEDIA_TYPE_VIDEO || !ist->decoding_needed)
            ist->next_pts = ist->pts = ist->dts;
    }

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

        ist->pts = ist->next_pts;
        ist->dts = ist->next_dts;

        if (avpkt.size && avpkt.size != pkt->size) {
            av_log(NULL, ist->showed_multi_packet_warning ? AV_LOG_VERBOSE : AV_LOG_WARNING,
                   "Multiple frames in a packet from stream %d\n", pkt->stream_index);
            ist->showed_multi_packet_warning = 1;
        }

        switch (ist->st->codec->codec_type) {
        case AVMEDIA_TYPE_AUDIO:
            ret = decode_audio    (ist, &avpkt, &got_output);
            break;
        case AVMEDIA_TYPE_VIDEO:
            ret = decode_video    (ist, &avpkt, &got_output);
            if (avpkt.duration) {
                duration = av_rescale_q(avpkt.duration, ist->st->time_base, AV_TIME_BASE_Q);
            } else if(ist->st->codec->time_base.num != 0 && ist->st->codec->time_base.den != 0) {
                int ticks= ist->st->parser ? ist->st->parser->repeat_pict+1 : ist->st->codec->ticks_per_frame;
                duration = ((int64_t)AV_TIME_BASE *
                                ist->st->codec->time_base.num * ticks) /
                                ist->st->codec->time_base.den;
            } else
                duration = 0;

            if(ist->dts != AV_NOPTS_VALUE && duration) {
                ist->next_dts += duration;
            }else
                ist->next_dts = AV_NOPTS_VALUE;

            if (got_output)
                ist->next_pts += duration; //FIXME the duration is not correct in some cases
            break;
        case AVMEDIA_TYPE_SUBTITLE:
            ret = transcode_subtitles(ist, &avpkt, &got_output);
            break;
        default:
            return -1;
        }

        if (ret < 0)
            return ret;

        avpkt.dts=
        avpkt.pts= AV_NOPTS_VALUE;

        // touch data and size only if not EOF
        if (pkt) {
            if(ist->st->codec->codec_type != AVMEDIA_TYPE_AUDIO)
                ret = avpkt.size;
            avpkt.data += ret;
            avpkt.size -= ret;
        }
        if (!got_output) {
            continue;
        }
    }

    /* handle stream copy */
    if (!ist->decoding_needed) {
        ist->dts = ist->next_dts;
        switch (ist->st->codec->codec_type) {
        case AVMEDIA_TYPE_AUDIO:
            ist->next_dts += ((int64_t)AV_TIME_BASE * ist->st->codec->frame_size) /
                             ist->st->codec->sample_rate;
            break;
        case AVMEDIA_TYPE_VIDEO:
            if (ist->framerate.num) {
                // TODO: Remove work-around for c99-to-c89 issue 7
                AVRational time_base_q = AV_TIME_BASE_Q;
                int64_t next_dts = av_rescale_q(ist->next_dts, time_base_q, av_inv_q(ist->framerate));
                ist->next_dts = av_rescale_q(next_dts + 1, av_inv_q(ist->framerate), time_base_q);
            } else if (pkt->duration) {
                ist->next_dts += av_rescale_q(pkt->duration, ist->st->time_base, AV_TIME_BASE_Q);
            } else 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_dts += ((int64_t)AV_TIME_BASE *
                                  ist->st->codec->time_base.num * ticks) /
                                  ist->st->codec->time_base.den;
            }
            break;
        }
        ist->pts = ist->dts;
        ist->next_pts = ist->next_dts;
    }
    for (i = 0; pkt && i < nb_output_streams; i++) {
        OutputStream *ost = output_streams[i];

        if (!check_output_constraints(ist, ost) || ost->encoding_needed)
            continue;

        do_streamcopy(ist, ost, pkt);
    }

    return 0;
}

static void print_sdp(void)
{
    char sdp[16384];
    int i;
    AVFormatContext **avc = av_malloc(sizeof(*avc) * nb_output_files);

    if (!avc)
        exit(1);
    for (i = 0; i < nb_output_files; i++)
        avc[i] = output_files[i]->ctx;

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

static int init_input_stream(int ist_index, char *error, int error_len)
{
    int ret;
    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);
        }

        av_opt_set_int(ist->st->codec, "refcounted_frames", 1, 0);

        if (!av_dict_get(ist->opts, "threads", NULL, 0))
            av_dict_set(&ist->opts, "threads", "auto", 0);
        if ((ret = avcodec_open2(ist->st->codec, codec, &ist->opts)) < 0) {
            if (ret == AVERROR_EXPERIMENTAL)
                abort_codec_experimental(codec, 0);
            snprintf(error, error_len, "Error while opening decoder for input stream #%d:%d",
                    ist->file_index, ist->st->index);
            return ret;
        }
        assert_avoptions(ist->opts);
    }

    ist->next_pts = AV_NOPTS_VALUE;
    ist->next_dts = AV_NOPTS_VALUE;
    ist->is_start = 1;

    return 0;
}

static InputStream *get_input_stream(OutputStream *ost)
{
    if (ost->source_index >= 0)
        return input_streams[ost->source_index];
    return NULL;
}

static int compare_int64(const void *a, const void *b)
{
    int64_t va = *(int64_t *)a, vb = *(int64_t *)b;
    return va < vb ? -1 : va > vb ? +1 : 0;
}

static void parse_forced_key_frames(char *kf, OutputStream *ost,
                                    AVCodecContext *avctx)
{
    char *p;
    int n = 1, i, size, index = 0;
    int64_t t, *pts;

    for (p = kf; *p; p++)