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• avcodec/h264dec : apply H.274 film grain

  17 août 2021, par Niklas Haas

  avcodec/h264dec : apply H.274 film grain
  Because we need access to ref frames without film grain applied, we have
  
  to add an extra AVFrame to H264Picture to avoid messing with the
  
  original. This requires some amount of overhead to make the reference
  
  moves work out, but it allows us to benefit from frame multithreading
  
  for film grain application "for free".
  Unfortunately, this approach requires twice as much RAM to be constantly
  
  allocated for ref frames, due to the need for an extra buffer per
  
  H264Picture. In theory, we could get away with freeing up this memory as
  
  soon as it's no longer needed (since ref frames do not need film grain
  
  buffers any longer), but trying to call ff_thread_release_buffer() from
  
  output_frame() conflicts with possible later accesses to that same frame
  
  and I'm not sure how to synchronize that well.
  Tested on all three cases of (no fg), (fg present but exported) and (fg
  
  present and not exported), with and without threading.
  Co-authored-by : James Almer <jamrial@gmail.com>
  
  Signed-off-by : Niklas Haas <git@haasn.dev>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/h264_picture.c
  • [DH] libavcodec/h264_slice.c
  • [DH] libavcodec/h264dec.c
  • [DH] libavcodec/h264dec.h

• avcodec/h264_picture : don't assume Film Grain Params side data will be present

  17 octobre 2021, par James Almer

  avcodec/h264_picture : don't assume Film Grain Params side data will be present
  If a decoding error happens before frame side data is allocated, this assert may be
  
  triggered. And since applying film grain is not enforced (we just warn it wasn't
  
  applied and move on), we can just do that in such scenarios.
  Fixes : Assertion failure
  
  Fixes : clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_fuzzer-5528650032742400
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavcodec/h264_picture.c

• Stream RTSP from ONVIF general camera to Youtube

  4 septembre 2017, par Samul

  I have a wifi camera that uses RTSP/ONVIF protocol and after reading FFMPEG docs and some threads at Google I am trying to broadcast the stream to Youtube. So I started a broadcast at youtube and in my computer in ffmpeg I executed this command :

  ffmpeg -f lavfi -i anullsrc -rtsp_transport udp -i rtsp://200.193.21.176:6002/onvif1 -tune zerolatency -vcodec libx264 -t 12:00:00 -pix_fmt + -c:v copy -c:a aac -strict experimental -f flv rtmp://x.rtmp.youtube.com/live2/private_key

  The command above looks like it’s correct cause it ouputs constantly something like this :

  

  The problem is that at YOUTUBE it still says I am offline. Why ?