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• configure : Don’t explicitly disable PIC for windows targets

  28 mai 2013, par Martin Storsjö

  configure : Don’t explicitly disable PIC for windows targets
  This reverts e08c946c6 and 05165c2f7a. The actual intention of
  
  e08c946c6 was to fix shared library builds for arm/win32, which
  
  can also be accomplished in other ways.
  Disabling pic on those platforms broke inline assembly on cygwin/64
  
  (since some inline assembly requires knowing whether we are building
  
  as PIC or not), and might also break inline assembly on other
  
  compilers on windows.
  As a side-effect, this unfortunately brings back all the warnings
  
  about PIC not having any effect on that platform.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DH] configure

• Python ffmpeg issue

  7 mars 2024, par SDailey

  I have a Python script which takes short videos (somewhere just over a minute long) and does the following

  


  

  1. strips original audio from mp4 video file
ffmpeg -i 1.mp4 -vcodec copy -an nosound_1.mp4"

  


  2. gets the length in seconds for an existing mp3 that will be inserted
ffmpeg.probe('1.mp3')['format']['duration']

  


  3. If the mp3 length is 57 seconds or above
trim the mp4 video to 58 seconds
ffmpeg -i nosound_1.mp4 -ss 00:00:00 -t 00:00:58 -c copy trimmed_1.mp4
else
trim the mp4 video to mp3 length + 2
ffmpeg -i nosound_1.mp4 -ss 00:00:00 -t 00:00:length+2 -c copy trimmed_1.mp4

  


  4. insert mp3 into newly trimmed video
input_video = ffmpeg.input('/path/to/trimmed_1.mp4')
input_audio = ffmpeg.input('/path/to/1.mp3')
ffmpeg.concat(input_video, input_audio, v=1, a=1).output('new_1.mp4').run()

  


  


  However, about a third of the time, the final video stream seems to have been compressed to finish at about 54 seconds - so although the video continues "playing" and the audio plays correctly until the end (usually 58 seconds), the video stream freezes on the last video frame at 54 seconds.

  


  So, if I watch trimmed_1.mp4, the video plays for 58 seconds, and let's say the last frame of the video is someone raising their hand.
The new_1.mp4 (trimmed_1 combined with 1.mp3), when played, seems to hit that last frame of someone raising their hand at the 54-second mark, so it looks like the video stream was slightly sped up to finish at the 54-second mark, and for the last 4 seconds makes it look like the video stream is frozen because it's showing the last frame while the audio continues to play.

  


  What is going wrong, and how can I fix it ?

  


• ffmpeg remove all silent parts from audio file

  18 décembre 2020, par user195392

  I would like to cut the silent parts (where my prof writes on the blackboard but does not talk) off from my lecture notes. I tried ffmpeg -i input.mp3 -af silenceremove=1:0:-50dB output.mp3 from this post, but it only deletes silence from the beginning of my file.

  


  Can I delete the silence everywhere with one command ? I only want the speech without all the writing on the blackboard. Thank you !