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• How to capture a log message coming out of node JS spawn ffmpeg command

  17 janvier 2014, par keenan

  I am trying to find the silent parts of an audio recording. This command does exactly what I want on my local machine.

  ffmpeg -i http://twf-audio.s3.amazonaws.com/uploads/DBC50460-9A5C-4174-9885-07337A582D58_1377839443598_tell.m4a -af silencedetect=n=-40dB:d=0.2 -f null -

  It sends a bunch of messages to the command line including these last three which are the lines of data that I need. (for reference : ffmpeg silencedetect docs)

  [silencedetect @ 0x7feea040cf20] silence_start : 0.0321995

  [silencedetect @ 0x7feea040cf20] silence_end : 0.975238 | silence_duration : 0.943039

  [silencedetect @ 0x7feea040cf20] silence_start : 1.47184

  I cannot figure out how to get that message out. Here is the nodejs code that is running. The only event that is triggered is the 'exit'. I thought that "pipe:1" sends output to stdout but that does not do anything.

  var ffmpeg = spawn('ffmpeg', ['-i',filename,'-af','silencedetect=n=-40dB:d=0.2', '-f', 'null','-y', 'pipe:1' ]);
  
  
  
  ffmpeg.on('message', function(data) {
  
      console.log('ffmpeg2 PARENT got message:', JSON.stringify(data));
  
  });
  
  
  
  ffmpeg.stdout.on('data', function(data) {
  
      console.log('ffmpeg stdout data = '+JSON.stringify(data) );
  
  });
  
  
  
  ffmpeg.on('exit', function (code, signal) {
  
    console.log('child process exited with code:' + code + ' signal:' + signal);
  
  });

• How to convert a set of BitmapDatas into video ?

  6 mars 2016, par user734081

  I basically need to record a video of the flash stage, and save it as a video file on the webserver. I don’t have FMS or the luxury of Java based servers like Red5 to stream to, so I am pretty much stuck with HTTP post to a php script. Now I can grab invidual snapshots (bitmapDatas) Just fine, but how can I convert them to a video file ? Any help is appreciated.

  PS : This is not an AIR app, so I am using flash runtime. And the video would be couple seconds long so there shouldn’t be much of a performance concern at this point.

• Android, AOSP tree, external project (ffmpeg) is built for AMD64

  22 avril 2015, par kagali-san

  I’m trying to build ffmpeg4android on current AOSP tree (from /external), which is lunch-configured to aosp_arm-eng and set to PLATFORM_VERSION=4.2.

  Resulting files are generated for AMD64 (host native) architecture, even though the major rest of tree is built (as expected) ARM :

  readelf -a android/aosp_arm-eng/ffplay|egrep "Class :|Machine :"
  Class : ELF64 Machine :
  Advanced Micro Devices X86-64

  versus

  readelf -a
  aosp/out/target/product/generic/symbols/system/lib/libril.so | egrep "Class :|Machine :"

  Class : ELF32
  Machine : ARM

  ---

  I will probably switch to other ways of getting ffmpeg-arm (presumably the one described here) ; the reason of asking this question is to understand, at which build stage does cross-compilation environment breaks.