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• Run avconv in python and direct stdout/stderr to a file

  19 février 2016, par tdk

  I wish to run Avconv commands and record the logs in a file. In the Ubuntu terminal this can be accomplished using &>> operator after the actual command enclosed in parenthesis i.e.

  (avconv -i SRCFILE -ss 00:15:00 -t 00:30:00 TARGETFILE -threads auto) &>> LOGFILE

  The above command works perfectly when run in the terminal.

  Now I have a number of such commands to run, and thought running them through Python would be good.

  1. I tried using the os.system(command_string) way
     , which when run does not pack the Avconv output to the LOGFILE, and the avconv command seems to execute after the Python script is done - evidenced by some string outputs I put in for debugging. I’m also getting some permission errors. Here is how the first portion of output looks like

     AVCONV COMMAND EXECUTED
     
     sh: 1: : Permission denied
     
     sh: 1: : Permission denied
     
     sh: 1: 
     
     
     
     
     
     PROGRAM DONE
     
     : Permission denied
     
     $ avconv version 11.2-6:11.2-1, Copyright (c) 2000-2014 the Libav developers
     
       built on Jan 18 2015 05:12:33 with gcc 4.9.2 (Ubuntu 4.9.2-10ubuntu2)
     
     Trailing options were found on the commandline.
     
     Input #0, mov,mp4,m4a,3gp,3g2,mj2, from ...

  2. I also tried using the subprocess.call() method for which I get the following error (NOTE : all files exist)

     Traceback (most recent call last):
     
       File "/home/usr/cnv.py", line 61, in <module>
     
         main()
     
       File "/home/usr/cnv.py", line 46, in main
     
         subprocess.call(newcmd)
     
       File "/usr/lib/python2.7/subprocess.py", line 522, in call
     
         return Popen(*popenargs, **kwargs).wait()
     
       File "/usr/lib/python2.7/subprocess.py", line 710, in __init__
     
         errread, errwrite)
     
       File "/usr/lib/python2.7/subprocess.py", line 1335, in _execute_child
     
         raise child_exception
     
     OSError: [Errno 2] No such file or directory
     
     </module>

  I wish to run multiple (think 50+) commands of Avconv similar to the version shown at the top, and have the logs saved in a file instead of in stdout. How do I do this - in Python or otherwise ?

• pipe youtube-dl to ffmpeg within a script

  28 février 2016, par user556068

  This is an expansion to an earlier question I asked which you can find here. I have been piping youtube-dl into a script via youtube-dl -iga /path/to/myFile.txt | myscript.sh which reads a text file of urls and extracts another set of urls to the actual video content being downloaded. Everything works great but there is much room for improvement.

  Instead of piping youtube-dl into the script I would like to include the youtube-dl command within the script itself. Here is the full script I have up to this point.

  #!/bin/bash  
  
  
  
  inArgs='-i'                 
  
  outArgs='-c copy -y'        
  
  dir="$HOME/Movies/fftest/"
  
  outFile="fftest_${count}"       
  
  ext='.mp4'        
  
  
  
  #### not sure about following 2 lines
  
  
  
  youtube-dl -iga /path/to/myFile.txt > /path/to/myFile2.txt
  
  exec 0to/myFile2.txt
  
  
  
  count=0
  
  if [ ! -d "${dir}" ]; 
  
  then
  
  mkdir -p "${dir}"
  
  fi      
  
  cd || "${HOME}"
  
  
  
  while read lineIn
  
  do
  
  {
  
  (( count ++ ))
  
  echo ffmpeg $inArgs $lineIn $outArgs "$dir$outFile$count$ext" &
  
  sleep 1
  
  }  
  
  done  

  After playing around with it a little I added the following lines. Code has been edited to reflect these changes.

  youtube-dl -iga /path/to/myFile.txt > /path/to/myFile2.txt
  
  exec 0to/myFile2.txt 

  This does work but it’s also throwing up some new error from ffmpeg that I haven’t yet encountered until now. I test by placing echo before the ffmpeg command. Everything looks fine doing that so I’m not really sure what the issue is at this point.

  So there are a couple things i would like to accomplish that I haven’t been able to figure out.

  • Have I properly redirected the input and do I need to do anything later in the script to put things back as they were before the script was called or will that occur naturally on its own when exiting the script ?

  • As it currently is, the script will overwrite any files previously created every time it is called. This is fine for testing purposes but not ideal beyond that. What I am looking for is a way to start writing the next file in the number sequence based on the last file in the directory. So if one time it creates 8 files named fftest_1.mpr - fftest_8.mp4 the second time when it is called to create 14 new files, it will know to start writing a file labeled fftest_9.mp4 - fftest_22.mp4. This is however beyond my abilities at the moment. Is there a way to do this ?

  • Another issue I’ve had is when trying kill the script as it runs in the background. Ctrl C doesn’t have any effect as far as I can tell. Is there an alternative kill command or key press I can use to ensure an immediate exit if necessary. Or a way to assign such within the script itself ?

  • Also any critiques, suggestions, alternatives or additions to any part of this script are very much welcomed and appreciated. This is all very new for me and I’m trying to learn more everyday. If any part of what I said didn’t make sense I will be happy to clarify.

• Streams mixed when using -filter_complex amerge in FFmpeg

  19 juin 2016, par BrainStone

  I am currently having issues with ffmpeg and one of its filters.

  I am trying to merge 2 audio streams of a video into one. for this purpose I tried this command :

  ffmpeg -i /home/maniaplanet/Videos/ManiaPlanet\ 2014-08-21\ 20-09-13-082.avi.output.mkv -filter_complex "[0:1][0:2] amerge=inputs=2"-c:v copy -c:a libvo_aacenc -b:a 256k /var/www/files/output.mp4

  But I get this output :

  ffmpeg version 1.0.10 Copyright (c) 2000-2014 the FFmpeg developers
  
    built on Jul 25 2014 07:50:40 with gcc 4.7 (Debian 4.7.2-5)
  
    configuration: --prefix=/usr --extra-cflags='-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security ' --extra-ldflags='-Wl,-z,relro' --cc='ccache cc' --enable-shared --enable-libmp3lame --enable-gpl --enable-nonfree --enable-libvorbis --enable-pthreads --enable-libfaac --enable-libxvid --enable-postproc --enable-x11grab --enable-libgsm --enable-libtheora --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libx264 --enable-libspeex --enable-nonfree --disable-stripping --enable-libvpx --enable-libschroedinger --disable-encoder=libschroedinger --enable-version3 --enable-libopenjpeg --enable-librtmp --enable-avfilter --enable-libfreetype --enable-libvo-aacenc --disable-decoder=amrnb --enable-libvo-amrwbenc --enable-libaacplus --libdir=/usr/lib/x86_64-linux-gnu --disable-vda --enable-libbluray --enable-libcdio --enable-gnutls --enable-frei0r --enable-openssl --enable-libass --enable-libopus --enable-fontconfig --enable-libfdk-aac --enable-libdc1394 --disable-altivec --dis  libavutil      51. 73.101 / 51. 73.101
  
    libavcodec     54. 59.100 / 54. 59.100
  
    libavformat    54. 29.104 / 54. 29.104
  
    libavdevice    54.  2.101 / 54.  2.101
  
    libavfilter     3. 17.100 /  3. 17.100
  
    libswscale      2.  1.101 /  2.  1.101
  
    libswresample   0. 15.100 /  0. 15.100
  
    libpostproc    52.  0.100 / 52.  0.100
  
  Input #0, matroska,webm, from '/home/maniaplanet/Videos/ManiaPlanet 2014-08-21 20-09-13-082.avi.output.mkv':
  
    Metadata:
  
      ISRC            : Video:RGB24 Audio0:Headset (2- Plantronics .Audio 655 DSP) Audio1:Headset (2- Plantronics .Audio 655 DSP)
  
      ENCODER         : Lavf55.37.100
  
    Duration: 01:49:48.47, start: 0.000000, bitrate: 3867 kb/s
  
      Stream #0:0: Video: h264 (High), yuv420p, 1280x1024, SAR 1:1 DAR 5:4, 30 fps, 30 tbr, 1k tbn, 60 tbc (default)
  
      Stream #0:1: Audio: mp3, 48000 Hz, stereo, s16, 320 kb/s (default)
  
      Stream #0:2: Audio: mp3, 48000 Hz, stereo, s16, 320 kb/s (default)
  
  File '/var/www/files/output.mp4' already exists. Overwrite ? [y/N] y
  
  Input channel layouts overlap: output layout will be determined by the number of distinct input channels
  
  [libvo_aacenc @ 0x7ae800] Unable to set encoding parameters
  
  Output #0, mp4, to '/var/www/files/output.mp4':
  
    Metadata:
  
      ISRC            : Video:RGB24 Audio0:Headset (2- Plantronics .Audio 655 DSP) Audio1:Headset (2- Plantronics .Audio 655 DSP)
  
      ENCODER         : Lavf55.37.100
  
      Stream #0:0: Audio: aac, 48000 Hz, 4.0, s16, 256 kb/s
  
      Stream #0:1: Video: h264, yuv420p, 1280x1024 [SAR 1:1 DAR 5:4], q=2-31, 30 fps, 90k tbn, 1k tbc (default)
  
  Stream mapping:
  
    Stream #0:1 (mp3) -> amerge:in0
  
    Stream #0:2 (mp3) -> amerge:in1
  
    amerge -> Stream #0:0 (libvo_aacenc)
  
    Stream #0:0 -> #0:1 (copy)
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

  I think the important part is at the bottom :

  Stream mapping:
  
    Stream #0:1 (mp3) -> amerge:in0
  
    Stream #0:2 (mp3) -> amerge:in1
  
    amerge -> Stream #0:0 (libvo_aacenc)
  
    Stream #0:0 -> #0:1 (copy)

  It maps the video stream as the second stream and the audio gets first. How do i resolve this ? -map did not help. (Maybe I just used it wrong)