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• Pipe between two child processes in Node.js ?

  4 mai 2014, par Joey Morani

  I’m trying to capture video using FFmpeg with Node.js, and send it to a browser via websockets for playing using the MediaSource API. What I have so far works in Firefox but doesn’t decode properly in Chrome. Apparently, from reading this question I need to use the sample_muxer program to ensure each ’cluster’ starts with a keyframe.

  Here’s the code I’m using :

  var ffmpeg = child_process.spawn("ffmpeg",[
  
      "-y",
  
      "-r", "30",
  
  
  
      "-f","dshow",           
  
      "-i","video=FFsource:audio=Stereo Mix (Realtek High Definition Audio)",
  
  
  
      "-vcodec", "libvpx",
  
      "-acodec", "libvorbis",
  
  
  
      "-threads", "0",
  
  
  
      "-b:v", "3300k",
  
      "-keyint_min", "150",
  
      "-g", "150",
  
  
  
      "-f", "webm",
  
  
  
      "-" // Output to STDOUT
  
  ]);
  
  
  
  ffmpeg.stdout.on('data', function(data) {
  
      //socket.send(data); // Just sending the FFmpeg clusters works with Firefox's 
  
                           // implementation of the MediaSource API. No joy with Chrome.
  
  
  
      // - - - This is the part that doesn't work - - -
  
      var muxer = child_process.spawn("sample_muxer",[
  
          "-i", data, // This isn't correct...
  
  
  
          "-o", "-" // Output to STDOUT
  
      ]);
  
  
  
      muxer.stdout.on('data', function(muxdata) {
  
          socket.send(muxdata); // Send the cluster
  
      });
  
  });
  
  
  
  ffmpeg.stderr.on('data', function (data) {
  
      console.log("" + data); // Output to console
  
  });

  Obviously I’m not piping it correctly and I’m unsure how I would while also including the arguments. Appreciate any help getting this working. Thanks !

• Revision 1306c1b09b : Masked Compound Inter Prediction The masked compound motion compensation has ma

  9 août 2013, par Yue Chen

  Changed Paths :
   Modify /configure

  
   Modify /vp9/common/vp9_blockd.h

  
   Modify /vp9/common/vp9_entropymode.c

  
   Modify /vp9/common/vp9_entropymode.h

  
   Modify /vp9/common/vp9_onyxc_int.h

  
   Modify /vp9/common/vp9_reconinter.c

  
   Modify /vp9/common/vp9_reconinter.h

  
   Modify /vp9/common/vp9_rtcd_defs.sh

  
   Modify /vp9/common/vp9_sadmxn.h

  
   Modify /vp9/common/vp9_subpelvar.h

  
   Modify /vp9/decoder/vp9_decodemv.c

  
   Modify /vp9/decoder/vp9_treereader.h

  
   Modify /vp9/encoder/vp9_bitstream.c

  
   Modify /vp9/encoder/vp9_encodeframe.c

  
   Modify /vp9/encoder/vp9_mcomp.c

  
   Modify /vp9/encoder/vp9_mcomp.h

  
   Modify /vp9/encoder/vp9_onyx_if.c

  
   Modify /vp9/encoder/vp9_onyx_int.h

  
   Modify /vp9/encoder/vp9_ratectrl.c

  
   Modify /vp9/encoder/vp9_rdopt.c

  
   Modify /vp9/encoder/vp9_sad_c.c

  
   Modify /vp9/encoder/vp9_subexp.c

  
   Modify /vp9/encoder/vp9_subexp.h

  
   Modify /vp9/encoder/vp9_variance.h

  
   Modify /vp9/encoder/vp9_variance_c.c

  
  
  Masked Compound Inter Prediction

  The masked compound motion compensation has mask types separating a
  block into wedges at specific angles and offsets. The mask is used to
  weight pixels from the first and second predictors to obtain the final
  predictor. The weighting is smooth near the partition boundaries but
  becomes a selecton farther away.

  Bit-rate reduction : +0.960%(derfraw300) +0.651%(stdhdraw250)

  Change-Id : I1327d22d3fc585b72ffa0e03abd90f3980f0876a

• Does anybody know how to concat on ffmpeg and python ? [closed]

  22 décembre 2023, par Jonas Harker

  I created a code on Python that supposedly concatenates two videos using Python to run an ffmpeg command through subprocess.
I get this error message :

  


  2c0] Could not open encoder before EOF
[vost#0:0/libx264 @ 0000024013bfa480] Task finished with error code: -22 (Invalid argument)
[aost#0:1/aac @ 0000024013bfb2c0] Task finished with error code: -22 (Invalid argument)
[aost#0:1/aac @ 0000024013bfb2c0] Terminating thread with return code -22 (Invalid argument)
[vost#0:0/libx264 @ 0000024013bfa480] Terminating thread with return code -22 (Invalid argument)
[out#0/mp4 @ 0000024013b91d80] Nothing was written into output file, because at least one of its streams received no packets.
frame=    0 fps=0.0 q=0.0 Lsize=       0kB time=N/A bitrate=N/A speed=N/A    
Conversion failed!
El archivo Batman - Mask of The Phantasm, Open Matte Version (1993 - 1080p BluRay)_segment_11_segment_2.mp4 ha sido procesado.
El archivo temporal output_temp.mp4 ha reemplazado a Batman - Mask of The Phantasm, Open Matte Version (1993 - 1080p BluRay)_segment_11_segment_2.mp4.
Ejecutando: ffmpeg -i "D:\BTO\MemeLaughnClap\Shorted\Batman - Mask of The Phantasm, Open Matte Version (1993 - 1080p BluRay)_segment_11_segment_3.mp4" -i "D:\BTO\MemeLaughnClap\Media\FV.mp4" -filter_complex concat=n=2:v=1:a=1 -c:v libx264 -preset medium -crf 23 -c:a aac -b:a 192k -y "D:\BTO\MemeLaughnClap\Shorted\output_temp.mp4"
ffmpeg version 2023-12-18-git-be8a4f80b9-full_build-www.gyan.dev Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 12.2.0 (Rev10, Built by MSYS2 project)


  


  I hoped they would concat, but they did not.