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• lavc/hevcdec : do not let missing ref frames invovled in dpb process

  15 juillet 2022, par Xu Guangxin

  lavc/hevcdec : do not let missing ref frames invovled in dpb process
  We will generate a new frame for a missed reference. The frame can only
  
  be used for reference. We assign an invalid decode sequence to it, so
  
  it will not be involved in any dpb process.
  Tested-by : Fei Wang <fei.w.wang@intel.com>
  
  Signed-off-by : Fei Wang <fei.w.wang@intel.com>
  
  Signed-off-by : Xu Guangxin <guangxin.xu@intel.com>
  

  • [DH] libavcodec/hevc_refs.c
  • [DH] libavcodec/hevcdec.c
  • [DH] libavcodec/hevcdec.h

• Multiple process in NodeJS or native FFMPeg

  9 octobre 2019, par LUCAS PAIXÃO SOARES RIBEIRO

  I’m using this code in nodejs :

  function spawnFfmpeg(input, output){
  
     var args = [
  
          '-i', input,
  
          '-b:v', '2M',
  
          '-b:a', '192k',
  
          '-vcodec', 'libx264',
  
          '-crf', '27',
  
          '-preset', 'veryfast',
  
          '-filter:v',
  
          'scale=w=1280:h=720',
  
          '-f', 'mpegts',
  
          '-blocksize', '16384',
  
          '-flush_packets', '1',
  
          output,
  
          '-y'
  
     ];
  
     var ffmpeg = spawn('ffmpeg', args);
  
     return ffmpeg;
  
  }
  
  function test(){
  
    for(var i = 0; i <= 100; i++){
  
          let ffmpeg = spawnFfmpeg('test.ts', 'output_'+i+'.ts');
  
          ffmpeg.on('exit', () => {
  
              console.log('EXITED');
  
          });
  
    }
  
  
  
  }
  
  setInterval(() => {
  
      console.log('OK');
  
      test();
  
  }, 4000);

  I’m downloading TS video files via HTTP and serving on my HTTP Server (so far it’s working), but when i want to resize video size the script is high cpu and ram (because too many process of ffmpeg).

  As I make 100 requests every 4 seconds, each request being a different source I created this test function and found the problem is that ffmepg can’t handle this high spawn number ;

  Note : When i only serve the TS File without resizing (using ffmpeg) the scripts works normal with only 0.4% CPU and 40MB Ram, but the problem occurs when i put ffmpeg in the nodejs script.

  So I thought the problem could be solved by using a javascript version of ffmepg (in the backend nodejs), is this possible ?

• Trying to batch process videos in multi-depth subdirectories with ffmpeg, find with -exec

  23 novembre 2022, par rogerD

  The sub-directories have different depth and have videos scattered. I am using find command to locate videos of multiple extensions like mp4, mkv, m4v, webm, ts, mov, etc. and then trying to process them with ffmpeg.

  


  So far, I have come up with this command :

  


  find . -type f \( -name "*.mp4" -o -name "*.mkv" -o -name "*.m4v" -o -name "*.webm" -o -name "*.ts" -o -name "*.mov" \) -execdir ffmpeg -i {} -vcodec libx264 -crf 32 -vf scale=1280:720 -r 16 -map_metadata -1 {}.mp4 \;


  


  If I try adding a prefix to ffmpeg output as ... out{}.mp4 \;, it is not possible. It says :

  


  


  out./.mp4 : No such file or directory

  


  


  I want the final output to have "out${original_name}".mp4 as the name. Is there anyway to add prefix to output ?