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• Why ffmpeg launched on a google cloud function can throw "Error : Output stream error : Maximum call stack size exceeded" ?

  15 décembre 2020, par Stepan Shilin

  I'm trying to process video files with ffmpeg running on google cloud functions. Video files are downloaded from a google file storage, processed in stream by fluent-ffmpeg and streamed to a new google storage file. It works on smaller files but throws an "Output stream error : Maximum call stack size exceeded" on larger files.

  



  I tried running the code on a normal pc, and I haven't encountered this error, even with larger files.

  



  These are the parameters I deploy the function with

  



  gcloud functions deploy $FUNCTION_NAME --runtime nodejs8 --trigger-http --timeout=180 --memory 256


  



  This is the code that processes video

  



  function cutVideo({videoUrl, startTime, duration, dist}) {
    return ffmpeg(videoUrl)
    .outputOptions('-movflags frag_keyframe+empty_moov')
    .videoCodec('copy')
    .audioCodec('copy')
    .format('mp4')
    .setStartTime(startTime)
    .setDuration(duration);
}

const sectionStream = cutVideo({
    videoUrl,
    startTime,
    duration,
    dist: tempFilePath,
});

const outputStream = bucket.file(sectionPath)
.createWriteStream({
    metadata: {
        contentType: config.contentType,
    },
    public: true,
});


  



  Actual error stack looks like this

  



    Error: Output stream error: Maximum call stack size exceeded&#xA;                                                                  at Pumpify.<anonymous> (/srv/node_modules/fluent-ffmpeg/lib/processor.js:498:34)&#xA;                                                                  at emitOne (events.js:121:20)&#xA;                                                                  at Pumpify.emit (events.js:211:7)&#xA;                                                                  at Pumpify.Duplexify._destroy (/srv/node_modules/duplexify/index.js:191:15)&#xA;                                                                  at /srv/node_modules/duplexify/index.js:182:10&#xA;                                                                  at _combinedTickCallback (internal/process/next_tick.js:132:7)&#xA;                                                                  at process._tickDomainCallback (internal/process/next_tick.js:219:9)&#xA;  RangeError: Maximum call stack size exceeded&#xA;                                                                  at replaceProjectIdToken (/srv/node_modules/@google-cloud/projectify/build/src/index.js:28:31)&#xA;                                                                  at replaceProjectIdToken (/srv/node_modules/@google-cloud/projectify/build/src/index.js:37:30)&#xA;                                                                  at replaceProjectIdToken (/srv/node_modules/@google-cloud/projectify/build/src/index.js:37:30)&#xA;                                                                  at value.map.v (/srv/node_modules/@google-cloud/projectify/build/src/index.js:30:32)&#xA;                                                                  at Array.map (<anonymous>)&#xA;                                                                  at replaceProjectIdToken (/srv/node_modules/@google-cloud/projectify/build/src/index.js:30:23)&#xA;                                                                  at replaceProjectIdToken (/srv/node_modules/@google-cloud/projectify/build/src/index.js:37:30)&#xA;                                                                  at replaceProjectIdToken (/srv/node_modules/@google-cloud/projectify/build/src/index.js:37:30)&#xA;                                                                  at value.map.v (/srv/node_modules/@google-cloud/projectify/build/src/index.js:30:32)&#xA;                                                                  at Array.map (<anonymous>)&#xA;</anonymous></anonymous></anonymous>

  



  What could cause this error on a google cloud function ?

  


• lavf/utils : fix error like "offset 0x1f85 : partial file"

  7 août 2019, par tomajsjiang

  lavf/utils : fix error like "offset 0x1f85 : partial file"
  fix error like "offset 0x1f85 : partial file", the root cause is when
  
  read the mp4 file from http, and the moov in the end of the mp4 file,
  
  reconfig the buffer will drop some data.
  Signed-off-by : Jun Zhao <barryjzhao@tencent.com>
  
  Signed-off-by : Zhongxing Jiang <tomajsjiang@tencent.com>
  

  • [DH] libavformat/utils.c

• `sage -pip install —user ffmpeg` did not make the "`OSError : Error : ffmpeg does not appear to be installed.`" message go away

  2 septembre 2019, par SomeoneElse

  I am running a Docker instance of Cocalc on a Ubuntu 16 server. Everything seems to be working but I am trying to debug why sage -pip install --user ffmpeg did not make the "OSError: Error: ffmpeg does not appear to be installed." message go away, even though it said it had been installed. Here is the full message.

  Error in lines 9-9
  
  Traceback (most recent call last):
  
    File "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_server.py", line 1188, in execute
  
      flags=compile_flags) in namespace, locals
  
    File "", line 1, in <module>
  
    File "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 2944, in show
  
      s = show0(objs, combine_all=True)
  
    File "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 2903, in show0
  
      b = show0(a)
  
    File "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 2868, in show0
  
      show_animation(obj, **kwds)
  
    File "/usr/local/sage/local/lib/python2.7/site-packages/smc_sagews/sage_salvus.py", line 2642, in show_animation
  
      obj.ffmpeg(t, delay=delay, **kwds)
  
    File "/usr/local/sage/local/lib/python2.7/site-packages/sage/plot/animate.py", line 885, in ffmpeg
  
      raise OSError(msg)
  
  OSError: Error: ffmpeg does not appear to be installed. Saving an animation to
  
  a movie file in any format other than GIF requires this software, so
  
  please install it and try again.
  
  </module>

  For reference, here is the code that gives the error :

  n = var("n")
  
  frames = []
  
  xr = (x, 0, 1)
  
  for k in srange(1, 50):
  
      g = plot((sum((-1)^(n-1)*sin(n*x)/n,n,1,k)), xr, color="blue", legend_label='k = %d' % k)
  
      g += plot(x/2, xr, color="green", legend_label="x/2")
  
      frames.append(g)
  
  
  
  a = animate(frames, ymin=0.0, ymax=1.0, legend_loc=(0.2,0.8))
  
  a.show()