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• PHP & FFMPEG running on AWS worker finishes 2/3 of operations properly then fails

  1er novembre 2016, par jreikes

  I have a PHP application (using the Laravel 5.3 framework) that performs several operations on video after upload (transcoding, thumbnail generation, etc.). Everything works great locally. But it works a little differently in AWS and that seems to be causing problems.

  In AWS, uploads go to S3, then the EC2 workers pull those files into a local temp folder, perform about 8 operations with FFMPEG via shell_exec() (storing the results into the temp folder), then transfer the finished files back to S3. The first 6 operations (which are related to transcoding) finish properly. The last 2 operations (which create thumbnails) usually fail (about 1/10 times I test it, the whole thing works — inexplicably).

  I have a WorkingCopy class to give me relative and fully qualified paths, as needed, and to automatically delete temp files after completion. I also have a ColdStroage class to handle the S3 data. All 8 FFMPEG operations are structured the same way using this class.

  In trying to troubleshoot the problem, I tried running the FFMPEG thumbnail generation via SSH and found that it was failing. It’s this error :

  [image2 @ 0x2e43320] Could not open file : path/filename.png
  
  av_interleaved_write_frame(): Input/output error

  https://trac.ffmpeg.org/wiki/Errors explains that this happens when the destination folder doesn’t exist. But, while testing via SSH, I was getting this error even when the destination folder existed. If I CHMOD 777 the destination folder, the operation completes successfully via SSH.

  Seems simple enough, right ? Thing is, my WorkingCopy class creates the temp folder with mkdir($folderName, 0777, true) — so the folders should already be 777. They actually don’t appear to be truly 777 when I check them via SSH, but still — why do the first 6 operations work ? Just to be sure this wasn’t the issue, I added a CHMOD to my script just before thumbnail creation and it still failed.

  Here’s one more weird thing... If I comment out those last two FFMPEG operations, then transcoding (the preceding operation) fails. Based on that, I thought maybe the file system needs a moment to finish writing the FFMPEG output before proceeding, so I added sleep(5) before the end of the script. It still doesn’t work.

  I can’t share the full code publicly, but here’s the general format of the FFMPEG calls

  $pathForLargeThumbnails = 'large_thumbnails';
  
  
  
  $thumbnailLargeWorkingCopy = new WorkingCopy($pathForLargeThumbnails);
  
  $thumbnailLarge = new ColdStorage($pathForLargeThumbnails);
  
  
  
  $shellErrors .= shell_exec(
  
        "/usr/local/bin/ffmpeg/ffmpeg"
  
      . " -loglevel error"
  
      . " -i " . "\"" . $originalVideoStream->fullPath . "\""
  
      . " -y"
  
      . " -vf thumbnail -frames:v 1"
  
      . " \"" . $thumbnailLargeWorkingCopy->fullPath . "\""
  
  );
  
  
  
  $thumbnailLarge->put($thumbnailLargeWorkingCopy->get());

  Anyone know why this succeeds 6 times and then fails twice at the end ?

• FFMPEG return No such file or directory when running by cronJob

  23 décembre 2015, par salina

  I’m trying to convert a video to MP4 .The problem is if I run the page manually it convert the video but If cron job runs the page to convert the video it returns this :

  ffmpeg version 0.11 Copyright (c) 2000-2012 the FFmpeg developers   built on Nov 19 2015 08:42:01 with gcc 4.4.7 20120313 (Red Hat 4.4.7-16)   configuration: --enable-gpl --enable-version3 --enable-nonfree --enable-shared --enable-libmp3lame --enable-libx264 --enable-libfaac --enable-libvpx --enable-libvorbis --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopencore-amrnb --enable-libtheora   libavutil      51. 54.100 / 51. 54.100   libavcodec     54. 23.100 / 54. 23.100   libavformat    54.  6.100 / 54.  6.100   libavdevice    54.  0.100 / 54.  0.100   libavfilter     2. 77.100 /  2. 77.100   libswscale      2.  1.100 /  2.  1.100   libswresample   0. 15.100 /  0. 15.100   libpostproc    52.  0.100 / 52.  0.100 vids_temp/147770505972365.mp4: No such file or directory

  this is the line I use for converting :

  $command = "$this->ffmpegAddress -i $this->input -y -c:v libx264 $outPut 2>&1";

  Why does it return : vids_temp/147770505972365.mp4: No such file or directory if I run it by cronjob ?

  Thanks

• Using ffmpeg via Popen running extremely slow in python

  30 décembre 2016, par law

  I’m writing a script that batch processes video in python. Basically, it takes a .dv file turns it into .avi and the captures only the audio in .wav format. Command line use of ffmpeg on a mac terminal executes on the order of a second or so. But when I use Popen to run the same code from within python, each file takes multiple minutes. Not sure why...I think I may be using Popen inappropriately. Code listed below :

  command1 = ['ffmpeg', '-i', input_name, '-y', '-vcodec', 'h264', 'temp.avi']
  
  command2 = ['ffmpeg', '-i', 'temp.avi', '-ab', '160k', '-ac', '44100', '-vn', outfile]
  
  
  
  proc1 = subprocess.Popen(command1, stdin=subprocess.PIPE, stderr=subprocess.PIPE)
  
  proc1.communicate()
  
  print "Converted to avi"
  
  
  
  proc2 = subprocess.Popen(command2, stdin=subprocess.PIPE, stderr=subprocess.PIPE)
  
  proc2.communicate()
  
  print "Wavefile extracted"