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• ffmpeg called from python random failure

  9 juillet 2017, par Jim Weisbin

  Python 2.7.1 on Mac OS X 10.12.5, ffmpeg 3.3.2 (installed with Brew).

  ffmpeg is called in a loop though thousands of Apple Lossless files, converting to mp3 and tagging.

  thecall = '/usr/local/bin/ffmpeg -hide_banner -loglevel error -i ' + <path to="to" m4a="m4a" file="file"> + ' -i ' + <path to="to" artwork="artwork"> + ' -map 0:0 -map 1:0 -id3v2_version 3 -map_metadata -1 -metadata album="xxx" -metadata artist="xxx" -metadata comment="Cover (Front)" -f mp3 -b:a 128K ' + <path to="to" mp3file="mp3file">'
  
  </path></path></path>

  os.system(thecall)

  this works perfectly from the command line, and also works from Python most of the time, but randomly fails with the message

  [alac @ 0x7fc888858800] invalid samples per frame : 0
  Error while decoding stream #0:0 : Invalid data found when processing input

  What’s strange is that on the files it failed on, if I run it from the command line it succeeds. I tried putting in time.sleep(5) but no change. And the failures are not always on the same file, so it seems like it’s a memory or threading issue. I also tried calling with subprocess() instead, no change.

  Any help would be appreciated.

• Packet Corruption : Why sometimes ffmpeg .bat batch video editing makes my computer unstable unable to restart ?

  13 juin 2022, par principal-ideal-domain

  I'm doing very time consuming ffmpeg video editing. That's why I put my commands into a .bat batch file and run them over night. Usually that works fine, but from time to time when I look the next moring I see an error message of this kind :

  


  

  


  From that state on, I didn't find any good way to close the console. When I press the [x] button in the top right corner, it freezes. When I try to kill the application using the task manager nothing happens. Even explorer.exe cannot be closed using the task manager. A shutdown won't do anything. During the last month I had this problem about three times and the only way I could close it was to long press the power button of the computer until it was turned off "the bad way".

  


  Any ideas what to in such situations ?
  
Or even better : How to prevent those situations ?
What can the reason(s) be for the error ?
Do you understand the message ?

  


  When the computer is started again the next morining and I run the same .bat file again everything works fine. So the same error does not repeat and the video is edited nicely !

  


  Edit : Now, about one week after posting this question the problem occurred many more times ! It is very annoying. I guess it has to do with the external hard drive connected by USB. Sometimes it randomly interrupts the connection ! That might be the reason for the behavior. Whatever its causing the error, I want to learn a solution how to deal with this in future. I don't want to always push the reset button of my computer. I want a proper way to be able to shut it down.

  


• fate/concatdec : Don't duplicate test requirements

  24 avril 2022, par Andreas Rheinhardt

  fate/concatdec : Don't duplicate test requirements
  The tests in concatdec.mak reuse files created by tests
  
  from lavf-container. Therefore these tests have the other tests
  
  as prerequisite and mostly duplicate their CONFIG-requirements.
  
  (The mxf_d10 tests did it incorrect as they only required
  
  the MXF muxer.) This duplication is of course bad as usual,
  
  so stop it by using the corresponding variable
  
  that contains the non-lavf-container-tests that are enabled
  
  to filter out all the concat-tests without a corresponding enabled
  
  non-concat test.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] tests/Makefile
  • [DH] tests/fate/concatdec.mak