[Libav-user] Video frames pts/dts

[Dmitry Adjiev]

So what I do wrong?


2014-08-05 6:36 GMT+04:00 Dmitry Adjiev <adjiev.dmitry at gmail.com>:

> Hello.
> I stream video over udp and can't calculate pts/dts.
>
>
>  outputStream_->sample_aspect_ratio.den =
> inputCodecContext_->sample_aspect_ratio.den;
>     outputStream_->sample_aspect_ratio.num =
> inputCodecContext_->sample_aspect_ratio.num;
>     outputStream_->time_base.num = 1;
>     outputStream_->time_base.den = frame_rate_ *
> inputCodecContext_->ticks_per_frame;
>     outputStream_->time_base.num = 1;
>     outputStream_->time_base.den = 1000;
>     outputStream_->r_frame_rate.num = frame_rate_;
>     outputStream_->r_frame_rate.den = 1;
>     outputStream_->avg_frame_rate.den = 1;
>     outputStream_->avg_frame_rate.num = frame_rate_;
>     outputStream_->codec->bit_rate = inputCodecContext_->bit_rate;
>     //outputStream_->duration = (m_out_end_time - m_out_start_time) * 1000;
>     outputStream_->duration = inputFormatContext_->duration;
>     outputFormatContext_->bit_rate = inputFormatContext_->bit_rate;
>
>     ret = avcodec_open2(outputStream_->codec, encoder_, NULL);
>
>     if (unlikely(ret < 0))
>         setErrorFromAvError(ret);
>
>
>     ret = avio_open(&outputFormatContext_->pb, url, AVIO_FLAG_WRITE);
>
>     if (unlikely(ret < 0))
>         setErrorFromAvError(ret);
>
>     is_open_ = true;
>
>     SwsContext* img_convert_context =
>                 sws_getCachedContext(NULL, inputCodecContext_->width,
> inputCodecContext_->height,
>                                      inputCodecContext_->pix_fmt,
>                                      outputStream_->codec->width,
> outputStream_->codec->height,
>                                      AV_PIX_FMT_YUV420P,
> SWS_FAST_BILINEAR, NULL, NULL, NULL);
>
>     if (img_convert_context != NULL)
>         swsContext_= boost::shared_ptr<SwsContext> (img_convert_context,
> sws_freeContext);
>
>     if (likely(is_open_)) {
>
>         AVFrame* frame = av_frame_alloc();
>         AVPacket packet, outputPacket;
>         outputPacket.size = 0;
>         outputPacket.data = NULL;
>         AVPicture pict;
>         avpicture_alloc(&pict, AV_PIX_FMT_YUV420P,
> inputCodecContext_->width, inputCodecContext_->height);
>         //int vid_pts = 0;
>
>         while (av_read_frame(inputFormatContext_, &packet) >= 0) {
>             outputStream_->pts = {0, 1, 1000};
>
>             if (packet.stream_index == 1) {
>                 int frame_finished;
>                 std::cout << "packet.dts " << packet.dts << " packet.pts "
> << packet.pts << std::endl;
>                 /*packet.dts = av_rescale_q_rnd(packet.dts,
>
> inputFormatContext_->streams[inputVideoStreamIndex_]->time_base,
>
> inputFormatContext_->streams[inputVideoStreamIndex_]->codec->time_base,
>                         static_cast<AVRounding>
> (AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
>                 packet.pts = av_rescale_q_rnd(packet.pts,
>
> inputFormatContext_->streams[inputVideoStreamIndex_]->time_base,
>
> inputFormatContext_->streams[inputVideoStreamIndex_]->codec->time_base,
>                         static_cast<AVRounding>
> (AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));*/
>                 avcodec_decode_video2(inputCodecContext_.get(), frame,
> &frame_finished, &packet);
>
>                 if (frame_finished) {
>                     sws_scale(swsContext_.get(), frame->data,
> frame->linesize, 0, inputCodecContext_->height, pict.data, pict.linesize);
>                     int got_packet = 0;
>                     int stream_index = 0;
>                     outputPacket.stream_index = stream_index;
>                     frame->pict_type = AV_PICTURE_TYPE_NONE;
>                     av_init_packet(&outputPacket);
>                     outputPacket.stream_index = 0;
>                     outputPacket.flags = AV_PKT_FLAG_KEY;
>                     outputPacket.duration = packet.duration;
>
>                     avcodec_encode_video2(outputStream_->codec,
> &outputPacket, frame, &got_packet);
>
>                     std::cout << "packet.dts " << packet.dts << "
> packet.pts " << packet.pts << std::endl;
>                     outputPacket.dts = av_rescale_q_rnd(outputPacket.dts,
>
> inputFormatContext_->streams[inputVideoStreamIndex_]->time_base,
>
> inputFormatContext_->streams[inputVideoStreamIndex_]->codec->time_base,
>                             static_cast<AVRounding>
> (AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
>                     outputPacket.pts = av_rescale_q_rnd(outputPacket.pts,
>
> inputFormatContext_->streams[inputVideoStreamIndex_]->time_base,
>
> inputFormatContext_->streams[inputVideoStreamIndex_]->codec->time_base,
>                             static_cast<AVRounding>
> (AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
>                     outputPacket.duration = packet.duration;
>                     //outputPacket.pts = vid_pts ++;
>
>                     if (got_packet) {
>                         outputPacket.stream_index = 0;
>
> av_interleaved_write_frame(outputFormatContext_.get(), &outputPacket);
>                     }
>
>                     av_free_packet(&outputPacket);
>                     outputPacket.size = 0;
>                     outputPacket.data = NULL;
>                 }
>             }
>         }
>
>         avpicture_free(&pict);
>
>         av_free_packet(&packet);
>         // Free the YUV frame
>         av_free(frame);
>     }
>
> vlc shows video frames with losts order, ffplay shows file but not all
>
> --
> Regards,
> Dmitry
>



-- 
Regards,
Dmitry
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://ffmpeg.org/pipermail/libav-user/attachments/20140805/23d2fe85/attachment.html>