ffmpeg.c

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

    if (!*got_output) {
        /* no audio frame */
        return ret;
    }

    /* 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 = decoded_frame->pts;

    /* 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;


    // preprocess audio (volume)
    if (audio_volume != 256) {
        int decoded_data_size = decoded_frame->nb_samples * avctx->channels * bps;
        void *samples = decoded_frame->data[0];
        switch (avctx->sample_fmt) {
        case AV_SAMPLE_FMT_U8:
        {
            uint8_t *volp = samples;
            for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
                int v = (((*volp - 128) * audio_volume + 128) >> 8) + 128;
                *volp++ = av_clip_uint8(v);
            }
            break;
        }
        case AV_SAMPLE_FMT_S16:
        {
            int16_t *volp = samples;
            for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
                int v = ((*volp) * audio_volume + 128) >> 8;
                *volp++ = av_clip_int16(v);
            }
            break;
        }
        case AV_SAMPLE_FMT_S32:
        {
            int32_t *volp = samples;
            for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
                int64_t v = (((int64_t)*volp * audio_volume + 128) >> 8);
                *volp++ = av_clipl_int32(v);
            }
            break;
        }
        case AV_SAMPLE_FMT_FLT:
        {
            float *volp = samples;
            float scale = audio_volume / 256.f;
            for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
                *volp++ *= scale;
            }
            break;
        }
        case AV_SAMPLE_FMT_DBL:
        {
            double *volp = samples;
            double scale = audio_volume / 256.;
            for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
                *volp++ *= scale;
            }
            break;
        }
        default:
            av_log(NULL, AV_LOG_FATAL,
                   "Audio volume adjustment on sample format %s is not supported.\n",
                   av_get_sample_fmt_name(ist->st->codec->sample_fmt));
            exit_program(1);
        }
    }

    rate_emu_sleep(ist);

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

        if (!check_output_constraints(ist, ost) || !ost->encoding_needed)
            continue;
        do_audio_out(output_files[ost->file_index].ctx, ost, ist, decoded_frame);
    }

    return ret;
}

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

    if (!ist->decoded_frame && !(ist->decoded_frame = avcodec_alloc_frame()))
        return AVERROR(ENOMEM);
    else
        avcodec_get_frame_defaults(ist->decoded_frame);
    decoded_frame = ist->decoded_frame;
    pkt->pts  = *pkt_pts;
    pkt->dts  = ist->dts;
    *pkt_pts  = AV_NOPTS_VALUE;

    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 (ret < 0)
        return ret;

    if (!*got_output) {
        /* no picture yet */
        return ret;
    }

    best_effort_timestamp= av_opt_ptr(avcodec_get_frame_class(), decoded_frame, "best_effort_timestamp");
    if(*best_effort_timestamp != AV_NOPTS_VALUE)
        ist->next_pts = ist->pts = decoded_frame->pts = *best_effort_timestamp;

    pkt->size = 0;

    pre_process_video_frame(ist, (AVPicture *)decoded_frame, &buffer_to_free);

    frame_sample_aspect= av_opt_ptr(avcodec_get_frame_class(), decoded_frame, "sample_aspect_ratio");
    for(i=0;i<nb_output_streams;i++) {
        OutputStream *ost = ost = &output_streams[i];
        if(check_output_constraints(ist, ost) && ost->encoding_needed){
            int changed =    ist->st->codec->width   != ost->input_video_filter->outputs[0]->w
                          || ist->st->codec->height  != ost->input_video_filter->outputs[0]->h
                          || ist->st->codec->pix_fmt != ost->input_video_filter->outputs[0]->format;
            if (!frame_sample_aspect->num)
                *frame_sample_aspect = ist->st->sample_aspect_ratio;
            decoded_frame->pts = ist->pts;
            if (ist->dr1 && decoded_frame->type==FF_BUFFER_TYPE_USER && !changed) {
                FrameBuffer      *buf = decoded_frame->opaque;
                AVFilterBufferRef *fb = avfilter_get_video_buffer_ref_from_arrays(
                                            decoded_frame->data, decoded_frame->linesize,
                                            AV_PERM_READ | AV_PERM_PRESERVE,
                                            ist->st->codec->width, ist->st->codec->height,
                                            ist->st->codec->pix_fmt);

                avfilter_copy_frame_props(fb, decoded_frame);
                fb->buf->priv           = buf;
                fb->buf->free           = filter_release_buffer;

                buf->refcount++;
                av_buffersrc_buffer(ost->input_video_filter, fb);
            } else
            if((av_vsrc_buffer_add_frame(ost->input_video_filter, decoded_frame, AV_VSRC_BUF_FLAG_OVERWRITE)) < 0){
                av_log(NULL, AV_LOG_FATAL, "Failed to inject frame into filter network\n");
                exit_program(1);
            }
        }
    }

    rate_emu_sleep(ist);

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

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

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

        while (av_buffersink_poll_frame(ost->output_video_filter)) {
            AVRational ist_pts_tb = ost->output_video_filter->inputs[0]->time_base;
            AVFrame *filtered_frame;
            AVFilterBufferRef *picref;

            if (av_buffersink_get_buffer_ref(ost->output_video_filter, &picref, 0) < 0){
                av_log(NULL, AV_LOG_WARNING, "AV Filter told us it has a frame available but failed to output one\n");
                goto cont;
            }
            if (!ist->filtered_frame && !(ist->filtered_frame = avcodec_alloc_frame())) {
                ret = AVERROR(ENOMEM);
                goto fail;
            }
            filtered_frame = ist->filtered_frame;
            *filtered_frame= *decoded_frame; //for me_threshold
            avfilter_fill_frame_from_video_buffer_ref(filtered_frame, picref);
            filtered_frame->pts = av_rescale_q(picref->pts, ist_pts_tb, AV_TIME_BASE_Q);
            if (!ost->frame_aspect_ratio)
                ost->st->codec->sample_aspect_ratio = picref->video->sample_aspect_ratio;
            do_video_out(output_files[ost->file_index].ctx, ost, ist, filtered_frame);
            cont:
            avfilter_unref_buffer(picref);
        }
    }

fail:
    av_free(buffer_to_free);
    return 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 (ret < 0)
        return ret;
    if (!*got_output)
        return ret;

    rate_emu_sleep(ist);

    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, pkt->pts);
    }

    avsubtitle_free(&subtitle);
    return ret;
}

/* pkt = NULL means EOF (needed to flush decoder buffers) */
static int output_packet(InputStream *ist,
                         OutputStream *ost_table, int nb_ostreams,
                         const AVPacket *pkt)
{
    int ret = 0, i;
    int got_output;
    int64_t pkt_pts = AV_NOPTS_VALUE;

    AVPacket avpkt;

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

    // 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 = transcode_audio    (ist, &avpkt, &got_output);
            break;
        case AVMEDIA_TYPE_VIDEO:
            ret = transcode_video    (ist, &avpkt, &got_output, &pkt_pts);
            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) {
        rate_emu_sleep(ist);
        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 (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_ostreams; i++) {
        OutputStream *ost = &ost_table[i];

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

        do_streamcopy(ist, ost, pkt);
    }

    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 void get_default_channel_layouts(OutputStream *ost, InputStream *ist)
{
    char layout_name[256];
    AVCodecContext *enc = ost->st->codec;
    AVCodecContext *dec = ist->st->codec;

    if (!dec->channel_layout) {
        if (enc->channel_layout && dec->channels == enc->channels) {
            dec->channel_layout = enc->channel_layout;
        } else {
            dec->channel_layout = av_get_default_channel_layout(dec->channels);

            if (!dec->channel_layout) {
                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_program(1);
            }
        }
        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);
    }
    if (!enc->channel_layout) {
        if (dec->channels == enc->channels) {
            enc->channel_layout = dec->channel_layout;
            return;
        } else {
            enc->channel_layout = av_get_default_channel_layout(enc->channels);
        }
        if (!enc->channel_layout) {
            av_log(NULL, AV_LOG_FATAL, "Unable to find default channel layout "
                   "for Output Stream #%d.%d\n", ost->file_index,
                   ost->st->index);
            exit_program(1);
        }
        av_get_channel_layout_string(layout_name, sizeof(layout_name),
                                     enc->channels, enc->channel_layout);
        av_log(NULL, AV_LOG_WARNING, "Guessed Channel Layout for Output Stream "
               "#%d.%d : %s\n", ost->file_index, ost->st->index, layout_name);
    }
}


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];
    int i;

    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);
        }

        ist->dr1 = codec->capabilities & CODEC_CAP_DR1;
        if (codec->type == AVMEDIA_TYPE_VIDEO && ist->dr1) {
            ist->st->codec->get_buffer     = codec_get_buffer;
            ist->st->codec->release_buffer = codec_release_buffer;
            ist->st->codec->opaque         = ist;
        }

        if (!av_dict_get(ist->opts, "threads", NULL, 0))
            av_dict_set(&ist->opts, "threads", "auto", 0);
        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);

        if (ist->st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
            for (i = 0; i < nb_output_streams; i++) {
                OutputStream *ost = &output_streams[i];
                if (ost->source_index == ist_index) {
                    if (!ist->st->codec->channel_layout || !ost->st->codec->channel_layout)
                        get_default_channel_layouts(ost, ist);
                    break;
                }
            }
        }
    }

    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->next_pts = AV_NOPTS_VALUE;
    ist->next_dts = 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->field_order    = icodec->field_order;
            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;
            /*
             * Avi is a special case here because it supports variable fps but
             * having the fps and timebase differe significantly adds quite some
             * overhead
             */
            if(!strcmp(oc->oformat->name, "avi")) {
                if (   copy_tb<0 && 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
                    || copy_tb==0){
                    codec->time_base = icodec->time_base;
                    codec->time_base.num *= icodec->ticks_per_frame;
                    codec->time_base.den *= 2;
                    codec->ticks_per_frame = 2;
                }
            } else if(!(oc->oformat->flags & AVFMT_VARIABLE_FPS)
                      && strcmp(oc->oformat->name, "mov") && strcmp(oc->oformat->name, "mp4") && strcmp(oc->oformat->name, "3gp")
                      && strcmp(oc->oformat->name, "3g2") && strcmp(oc->oformat->name, "psp") && strcmp(oc->oformat->name, "ipod")
            ) {
                if(   copy_tb<0 && av_q2d(icodec->time_base)*icodec->ticks_per_frame > av_q2d(ist->st->time_base)
                                && av_q2d(ist->st->time_base) < 1.0/500
                   || copy_tb==0){
                    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(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 != VSYNC_PASSTHROUGH
                   && (video_sync_method == VSYNC_CFR || (video_sync_method == VSYNC_AUTO && !(oc->oformat->flags & AVFMT_VARIABLE_FPS)))){
                    av_log(oc, AV_LOG_WARNING, "Frame rate very high for a muxer not efficiently supporting it.\n"
                                               "Please consider specifying 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 (configure_video_filters(ist, ost)) {
                    av_log(NULL, AV_LOG_FATAL, "Error opening filters!\n");
                    exit_program(1);
                }
                break;
            case AVMEDIA_TYPE_SUBTITLE:
                codec->time_base = (AVRational){1, 1000};
                break;
            default:
                abort();
                break;
            }
            /* two pass mode */
            if (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 (!strcmp(ost->enc->name, "libx264")) {
                    av_dict_set(&ost->opts, "stats", logfilename, AV_DICT_DONT_OVERWRITE);
                } else {
                    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;
                    }
                }
            }
        }
    }

    /* 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 (!av_dict_get(ost->opts, "threads", NULL, 0))
                av_dict_set(&ost->opts, "threads", "auto", 0);
            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 (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);
                }
            }
            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