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• RTMP live stream directly from NVENC encoder

  16 novembre 2018, par rnd

  I am trying to create a live RTMP stream containing the animation generated with NVIDIA OptiX. The stream is to be received by nginx + rtmp module and broadcasted in MPEG-DASH format. Full chain up to dash.js player is working if the video is first saved to .flv file and then I send it with ffmpeg without any reformatting using command :

  



  ffmpeg -re -i my_video.flv -c:v copy -f flv rtmp://x.x.x.x:1935/dash/test


  



  But I want to stream directly from the code. And with this I am failng... Nginx logs an error "dash : invalid avcc received (2 : No such file or directory)". Then it seems to receive the stream correctly (segments are rolling, dash manifest is there), however the stream is not possible to play in the browser.

  



  I can see only one difference in the manifest between direct stream and stream from file. Codecs attribute of the representation in the direct stream is missed : codecs="avcc1.000000" instead of "avc1.640028" which I get when streaming from file.

  



  My code opens the stream :

  



  av_register_all();
AVOutputFormat* fmt = av_guess_format("flv",
file_name, nullptr);
fmt->video_codec = AV_CODEC_ID_H264;

AVFormatContext* _oc;
avformat_alloc_output_context2(&_oc, fmt, nullptr, "rtmp://x.x.x.x:1935/dash/test");

AVStream* _vs = avformat_new_stream(_oc, nullptr);
_vs->id = 0;
_vs->time_base = AVRational { 1, 25 };
_vs->avg_frame_rate = AVRational{ 25, 1 };

AVCodecParameters *vpar = _vs->codecpar;
vpar->codec_id = fmt->video_codec;
vpar->codec_type = AVMEDIA_TYPE_VIDEO;
vpar->format = AV_PIX_FMT_YUV420P;
vpar->profile = FF_PROFILE_H264_HIGH;
vpar->level = _level;
vpar->width = _width;
vpar->height = _height;
vpar->bit_rate = _avg_bitrate;

avio_open(&_oc->pb, _oc->filename, AVIO_FLAG_WRITE);
avformat_write_header(_oc, nullptr);


  



  Width, height, bitrate, level and profile I get from NVENC encoder settings. I also do the error checking, ommited here. Then I have a loop writing each encoded packets, with IDR frames etc all prepared on the fly with NVENC. The loop body is :

  



  auto & pkt_data = _packets[i];
AVPacket pkt = { 0 };
av_init_packet(&pkt);
pkt.pts = av_rescale_q(_n_frames++, AVRational{ 1, 25 }, _vs->time_base);
pkt.duration = av_rescale_q(1, AVRational{ 1, 25 }, _vs->time_base);
pkt.dts = pkt.pts;
pkt.stream_index = _vs->index;
pkt.data = pkt_data.data();
pkt.size = (int)pkt_data.size();

if (!memcmp(pkt_data.data(), "\x00\x00\x00\x01\x67", 5))
{
    pkt.flags |= AV_PKT_FLAG_KEY;
}

av_write_frame(_oc, &pkt);


  



  Obviously ffmpeg is writing avcc code somewhere... I have no clue where to add this code so the RTMP server can recognize it. Or I am missing something else ?

  



  Any hint greatly appreciated, folks !

  


• Play drm protected video

  10 mars 2023, par Aaditya Kumar

  I downloaded video from this link :-

  


  https://zee5vod.akamaized.net/drm1/elemental/dash/TV_SHOWS/ZEE_TV/March2021/15032021/Seamless/BQC_Kumkum_Bhagya_CS_Ep1787_Seamless_15032021_hi_a2808b31106f106303f084b9943d5986/manifest1080lowp/1080lowp_000000649.mp4

  


  


  but when i am playing video then the video is not supported

  


  


  someone help that how can i able to play this video

  


• lavf/dashenc : Don't put non-mp4 streams in HLS manifests.

  28 novembre 2018, par Andrey Semashev

  lavf/dashenc : Don't put non-mp4 streams in HLS manifests.
  The only native HLS implementation in the wild (Safari browser) doesn't
  
  support WebM. And at least some MSE-based players (e.g. shaka-player)
  
  cannot handle WebM media segments when playing HLS. So just skip non-mp4
  
  streams from HLS manifests. Note that such streams will still be described
  
  by the DASH manifest and therefore consumed by players supporting DASH.
  

  • [DH] libavformat/dashenc.c