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• avcodec/huffyuvdec: Check vertical subsampling in hymt

  4 July 2019, by Michael Niedermayer

  avcodec/huffyuvdec: Check vertical subsampling in hymt
  Fixes: out of array access
  
  Fixes: 15484/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HYMT_fuzzer-5765377054736384
  
  Fixes: 15559/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HYMT_fuzzer-5710295743332352
  Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
  
  Reviewed-by: Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/huffyuvdec.c

• How to save (record) rtsp stream to the disk storage without artifacts and missing seconds?

  20 September 2019, by Bogdan Rudnytskyi

  I need to save (record) rtsp stream to the disk storage.
  I am using nginx-module and ffmpeg for it.
  Here the config for enable recording:

  rtmp {
  
      live on;
  
      hls on;
  
      hls_fragment 5s;
  
      server {
  
          listen 1935;
  
          application cam1 {
  
              hls_path /tmp/cam1;
  
          }
  
          exec_static ffmpeg -rtsp_transport tcp -i rtsp://... -c copy -f flv rtmp://.../cam1/stream;
  
      }
  
  }

  Config is creating the flv files, each duration of 5 second.
  Then we need to merge all got files in one file by command:

  ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.flv

  After concated files we are got a problem. When previous 5 seconds end and start next 5 seconds we have artifacts and missing 0.5-1 second.

  Please, get me help with saving rtsp stream without artifacts and missing seconds.

• System.Diagnostics.Process pipe (vertical bar) not accepted as argument

  28 September 2019, by emp

  I’m trying to execute this code using System.Diagnostics.Process. It works fine in command line. But in C# it’s failing on the | character.

  var myProcess = new Process();
  
  var p = new ProcessStartInfo();
  
  
  
  var sArgs = " -i emp.mp3 -f wav - | neroAacEnc -ignorelength -q 0.5 -if - -of emp.mp4";
  
  p.FileName = "ffmpeg.exe";
  
  p.CreateNoWindow = false;
  
  p.RedirectStandardOutput = false;
  
  p.UseShellExecute = false;
  
  p.Arguments = sArgs;
  
  
  
  myProcess.StartInfo = p;
  
  
  
  myProcess.Start();
  
  myProcess.WaitForExit();

  It gives the following error:

  Unable to find a suitable output format for ’|’: Invalid argument

  I’ve looked around on stackoverflow and found the following hint but it is also not working:

  var psi = new ProcessStartInfo("ffmpeg.exe");
  
  psi.Arguments = 
  
      "\"-i emp.mp3 -f wav -\" | \"neroAacEnc -ignorelength -q 0.5 -if - -of emp.mp4\"";
  
  psi.CreateNoWindow = false;
  
  psi.UseShellExecute = false;
  
  
  
  var process = new Process { StartInfo = psi };
  
  
  
  process.Start();
  
  process.WaitForExit();

  gives the following error:

  Unrecognized option ’i emp.mp3 -f wav -’
  Failed to set value ’|’ for option ’i emp.mp3 -f wav -’