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• Getting realtime output from ffmpeg to be used in progress bar (PyQt4, stdout)

  8 mars 2017, par Jason O'Neil

  I’ve looked at a number of questions but still can’t quite figure this out. I’m using PyQt, and am hoping to run ffmpeg -i file.mp4 file.avi and get the output as it streams so I can create a progress bar.

  I’ve looked at these questions :
  Can ffmpeg show a progress bar ?
  http://stackoverflow.com/questions/1606795/catching-stdout-in-realtime-from-subprocess

  I’m able to see the output of a rsync command, using this code :

  import subprocess, time, os, sys
  
  
  
  cmd = "rsync -vaz -P source/ dest/"
  
  p, line = True, 'start'
  
  
  
  
  
  p = subprocess.Popen(cmd,
  
                       shell=True,
  
                       bufsize=64,
  
                       stdin=subprocess.PIPE,
  
                       stderr=subprocess.PIPE,
  
                       stdout=subprocess.PIPE)
  
  
  
  for line in p.stdout:
  
      print("OUTPUT>>> " + str(line.rstrip()))
  
      p.stdout.flush()

  But when I change the command to ffmpeg -i file.mp4 file.avi I receive no output. I’m guessing this has something to do with stdout / output buffering, but I’m stuck as to how to read the line that looks like

  frame=   51 fps= 27 q=31.0 Lsize=     769kB time=2.04 bitrate=3092.8kbits/s

  Which I could use to figure out progress.

  Can someone show me an example of how to get this info from ffmpeg into python, with or without the use of PyQt (if possible)

  ---

  EDIT :
  I ended up going with jlp’s solution, my code looked like this :

  #!/usr/bin/python
  
  import pexpect
  
  
  
  cmd = 'ffmpeg -i file.MTS file.avi'
  
  thread = pexpect.spawn(cmd)
  
  print "started %s" % cmd
  
  cpl = thread.compile_pattern_list([
  
      pexpect.EOF,
  
      "frame= *\d+",
  
      '(.+)'
  
  ])
  
  while True:
  
      i = thread.expect_list(cpl, timeout=None)
  
      if i == 0: # EOF
  
          print "the sub process exited"
  
          break
  
      elif i == 1:
  
          frame_number = thread.match.group(0)
  
          print frame_number
  
          thread.close
  
      elif i == 2:
  
          #unknown_line = thread.match.group(0)
  
          #print unknown_line
  
          pass

  Which gives this output :

  started ffmpeg -i file.MTS file.avi
  
  frame=   13
  
  frame=   31
  
  frame=   48
  
  frame=   64
  
  frame=   80
  
  frame=   97
  
  frame=  115
  
  frame=  133
  
  frame=  152
  
  frame=  170
  
  frame=  188
  
  frame=  205
  
  frame=  220
  
  frame=  226
  
  the sub process exited

  Perfect !

• Concatenating on Windows throws "Invalid data found when processing input" while it works on Mac and Linux

  15 février 2020, par miguelmorin

  I need to run a command with a nightly build of FFMPEG to report a bug on the concat protocol. I found it difficult to compile from source with libx264 support on Linux, and I want to spare my Mac computer, so I use the nightly build on Windows from Zeranoe.

  I call this command to concatenate the files :

  ffmpeg -safe 0 concat -i files_to_combine -vcodec libx264 show.mp4

  where files_to_combine is :

  file ./short_DSC_0013.MOV
  
  file ./short_DSC_0014.MOV
  
  file ./short_DSC_0015.MOV
  
  file ./short_DSC_0016.MOV
  
  file ./short_DSC_0017.MOV
  
  file ./short_DSC_0018.MOV
  
  file ./short_DSC_0019.MOV

  I call this command from the directory containing the video files and files_to_combine.

  On Windows with a nightly build, I get the error :

  files_to_combine : Invalid data found when processing input
  

  I changed file ./DSC_0013.MOV to these options, all with the same error :

  file 'short_DSC_0013.MOV'
  
  file '.\short_DSC_0013.MOV'
  
  file 'F:\short_DSC_0013.MOV'

  How can I debug this error, or what is the syntax for concatenating on Windows with a nightly build ?

  Update with log-level 48

  I ran the same command with -v 48 and got :

  F :\brain squids>C :\Users\migue\Desktop\ffmpeg-20200211-f15007a-win64-static\bin\ffmpeg.exe -v 48 -i files_to_combine -vcodec libx264 show.mp4
  ffmpeg version git-2020-02-11-f15007a Copyright (c) 2000-2020 the FFmpeg developers
    built with gcc 9.2.1 (GCC) 20200122
    configuration : —enable-gpl —enable-version3 —enable-sdl2 —enable-fontconfig —enable-gnutls —enable-iconv —enable-libass —enable-libdav1d —enable-libbluray —enable-libfreetype —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libopenjpeg —enable-libopus —enable-libshine —enable-libsnappy —enable-libsoxr —enable-libtheora —enable-libtwolame —enable-libvpx —enable-libwavpack —enable-libwebp —enable-libx264 —enable-libx265 —enable-libxml2 —enable-libzimg —enable-lzma —enable-zlib —enable-gmp —enable-libvidstab —enable-libvorbis —enable-libvo-amrwbenc —enable-libmysofa —enable-libspeex —enable-libxvid —enable-libaom —enable-libmfx —enable-ffnvcodec —enable-cuvid —enable-d3d11va —enable-nvenc —enable-nvdec —enable-dxva2 —enable-avisynth —enable-libopenmpt —enable-amf
    libavutil      56. 39.100 / 56. 39.100
    libavcodec     58. 68.102 / 58. 68.102
    libavformat    58. 38.100 / 58. 38.100
    libavdevice    58.  9.103 / 58.  9.103
    libavfilter     7. 75.100 /  7. 75.100
    libswscale      5.  6.100 /  5.  6.100
    libswresample   3.  6.100 /  3.  6.100
    libpostproc    55.  6.100 / 55.  6.100
  Splitting the commandline.
  Reading option ’-v’ ... matched as option ’v’ (set logging level) with argument ’48’.
  Reading option ’-i’ ... matched as input url with argument ’files_to_combine’.
  Reading option ’-vcodec’ ... matched as option ’vcodec’ (force video codec (’copy’ to copy stream)) with argument ’libx264’.
  Reading option ’show.mp4’ ... matched as output url.
  Finished splitting the commandline.
  Parsing a group of options : global .
  Applying option v (set logging level) with argument 48.
  Successfully parsed a group of options.
  Parsing a group of options : input url files_to_combine.
  Successfully parsed a group of options.
  Opening an input file : files_to_combine.
  [NULL @ 0000021c781784c0] Opening ’files_to_combine’ for reading
  [file @ 0000021c78179580] Setting default whitelist ’file,crypto,data’
  [AVIOContext @ 0000021c781817c0] Statistics : 182 bytes read, 0 seeks
  files_to_combine : Invalid data found when processing input
  

  The contents of files_to_combine is :

  file ’short_DSC_0013.MOV’
  file ’short_DSC_0014.MOV’
  file ’short_DSC_0015.MOV’
  file ’short_DSC_0016.MOV’
  file ’short_DSC_0017.MOV’
  file ’short_DSC_0018.MOV’
  file ’short_DSC_0019.MOV’
  

  Update because of wrong command

  I had mistyped the command. The right command has a -f in front of concat, which I found because the accepted answer was able to make the command work in a similar environment :

  ffmpeg -safe 0 -f concat -i files_to_combine -vcodec libx264 show.mp4

• Access to folders on Ubuntu-based Rails server (keep getting "No such file..")

  13 avril 2012, par Stpn

  I am setting up Rails+ffmpeg on Ubuntu and I keep getting

   Errno::ENOENT
  
   No such file or directory..

  The setup is as follows :

  /home/username/RailsApp
  /home/username/videos/

  I am trying to run ffmpeg to write to /home/username/videos and I used "/home/username/videos/" and " /videos/" but no luck..

  What am I missing ?

  "www-data" user is included in "username" group..

  Rails app works fine otherwise..

  Any input greatly appreciated !

  Thanks !