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• How to efficiently clear ffmpeg buffer

  23 juillet 2020, par KmanOfficial

  I am using Chiaki (https://github.com/thestr4ng3r/chiaki/) - A Open Source Video Streaming Application for the PS4.

  


  I have one issue though. The stream successfully shows the playstation but after about 60 seconds. The stream freezes and gets stuck on the last processed frame until I restart the application. I believe the issue is in the C++ file - (https://github.com/thestr4ng3r/chiaki/blob/master/gui/src/videodecoder.cpp) and the issue is specifically here : `

  


  void VideoDecoder::PushFrame(uint8_t *buf, size_t buf_size)
{
    {
        QMutexLocker locker(&mutex);

    AVPacket packet;
    av_init_packet(&packet);
    packet.data = buf;
    packet.size = buf_size;
    int r;
send_packet:
        r = avcodec_send_packet(codec_context, &packet);
        if(r != 0)
        {
            if(r == AVERROR(EAGAIN))
            {
                CHIAKI_LOGE(log, "AVCodec internal buffer is full removing frames before pushing");
                AVFrame *frame = av_frame_alloc();
                if(!frame)
                {
                    CHIAKI_LOGE(log, "Failed to alloc AVFrame");
                    return;
                }
                r = avcodec_receive_frame(codec_context, frame);
                av_frame_free(&frame);
                if(r != 0)
                {
                    CHIAKI_LOGE(log, "Failed to pull frame");
                    return;
                }
                goto send_packet;
            }
            else
            {
                char errbuf[128];
                av_make_error_string(errbuf, sizeof(errbuf), r);
                CHIAKI_LOGE(log, "Failed to push frame: %s", errbuf);
                return;
            }
        }
    }

    emit FramesAvailable();
}


  


  `

  


  I believe so as the application log constantly prints this logged message : "AVCodec internal buffer is full removing frames before pushing"

  


  I've tried looking at the ffmpeg manual and I am struggling on how to flush the internal buffer to get the stream constantly flowing can anyone point me in the correct direction. Thank you.

  


• how to convert RTPDUMP video file to mp4

  2 mars 2017, par Asain Kujovic

  Viber recently got "instant video message" option, called also "video push-to-talk" (vptt).

  Inside viber data in directory ".vptt" there are files with vptt extension. Envelope format is classic ZIP file, when extracted gives jpg-thumbnail and ’video’ file.

  Video file says "# !rtpplay1.0" inside first line, so it should be format of rtp-tools, used by wireshark too, and somehow related to actual WebRTC trends...

  So if video content inside this rtpdump file is not encrypted ( ? ), "how to save viber instant message push to talk video" boils down to just : "how to convert rtpdump video to mp4".

  rtpplay can send it to some port, but ffmpeg/ffplay/vlc needs correct sdp file.

  does someone knows something further about this ?

• how to convert RTPDUMP video file to mp4

  11 novembre 2020, par Asain Kujovic

  Viber recently got "instant video message" option, called also "video push-to-talk" (vptt).

  



  Inside viber data in directory ".vptt" there are files with vptt extension. Envelope format is classic ZIP file, when extracted gives jpg-thumbnail and 'video' file.

  



  Video file says "# !rtpplay1.0" inside first line, so it should be format of rtp-tools, used by wireshark too, and somehow related to actual WebRTC trends...

  



  So if video content inside this rtpdump file is not encrypted ( ? ), "how to save viber instant message push to talk video" boils down to just : "how to convert rtpdump video to mp4".

  



  rtpplay can send it to some port, but ffmpeg/ffplay/vlc needs correct sdp file.

  



  does someone knows something further about this ?