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• Optimizing FFmpeg/x264 Configuration for Ultra-Low Latency UDP Streaming [closed]

  17 décembre 2024, par pourjour

  I'm implementing a real-time screen streaming application using FFmpeg's libraries (libavcodec, libavformat) with H.264 encoding and UDP transport. While I have basic low-latency settings in place, I'm looking to minimize latency as much as possible while maintaining reasonable quality.
Here's my current encoder configuration :

  


  // Configure codec for low latency
codecContext->width = WIDTH;
codecContext->height = HEIGHT;
codecContext->time_base = AVRational{1, FPS};
codecContext->framerate = AVRational{FPS, 1};
codecContext->pix_fmt = AV_PIX_FMT_YUV420P;
codecContext->gop_size = 10;
codecContext->max_b_frames = 0;
codecContext->refs = 1;
codecContext->flags |= AV_CODEC_FLAG_LOW_DELAY;
codecContext->bit_rate = 3000000;

// x264 specific settings
av_opt_set(codecContext->priv_data, "preset", "ultrafast", 0);
av_opt_set(codecContext->priv_data, "tune", "zerolatency", 0);
av_opt_set(codecContext->priv_data, "delay", "0", 0);
av_opt_set(codecContext->priv_data, "profile", "baseline", 0);
av_opt_set(codecContext->priv_data, "x264opts",
           "no-mbtree:sliced-threads:sync-lookahead=0:rc-lookahead=0:"
           "no-scenecut:no-cabac:force-cfr", 0);


  


  For network transport, I'm using MPEGTS over UDP :

  


  QString url = QString("udp://%1:%2?pkt_size=1316").arg(targetAddress).arg(targetPort);


  


  Current issues :

  


  

  • Still experiencing 200-300ms latency Some quality degradation with
fast motion Occasional frame drops

  


  


  Questions :

  


  

  • Are there additional x264 options or FFmpeg settings I should
consider for reducing latency ?

  


  • What are the optimal GOP and bitrate
settings for balancing latency vs quality ?

  


  • Are there better muxer settings or alternative container formats I should consider ?

  


  • How can I optimize the network transport settings (packet size, buffering,
etc.) ?

  


  • Are there any tradeoffs I should be aware of with my current
configuration ?

  


  


• MAINTAINERS : Add some Mail aliases / mailing lists (aka how to contact the specific...

  28 août 2024, par Michael Niedermayer

  MAINTAINERS : Add some Mail aliases / mailing lists (aka how to contact the specific maintainers)
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] MAINTAINERS

• Getting "Unrecognized option '1'" when using "-map_metadata -1" to erase metadata with ffmpeg [closed]

  20 novembre 2024, par Nautilus Era

  Edit :
  
As said in the header, this question is not about programing and I will ask it on the appropriate Stack.
  
My confusion came from the fact that I am using Python to make my calls to the shell, however, it has nothing to do with the problem I am trying to solve.
  
Thank you for your time and sorry for the bother.

  


  ---

  


  I was trying to erase metadata from a file using ffmpeg using the
following command :

  


  ffmpeg –i $file_path –map_metadata -1 –c copy $stripped_video_output


  


  Where $file_path and $stripped_video_output are variables containing
their respective path.

  


  ffmpeg gave the answer :

  


  Unrecognized option '1'. 
Error splitting the argument list: Option not found


  


  I am using Debian 12.

  


  I tried with both the repository's version as well as a compiled version
of ffmpeg and I tried on two different computers.

  


  If anyone can help with that, I would appreciate it.

  


  Thank you in advance and have a good one.