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• qt-faststart : Fix the signedness of variables keeping the ftello return values

  29 octobre 2012, par Michael Niedermayer

  qt-faststart : Fix the signedness of variables keeping the ftello return values
  These variables are assigned the return values of ftello, which
  
  returns an off_t, which is a signed type. On errors, ftello returns
  
   1, thus make sure this error return value can be stored properly.
  Signed-off-by : Martin Storsjö <martin@martin.st>
  

  • [DBH] tools/qt-faststart.c

• PySceneDetect FFmpeg Not Available

  14 août 2023, par Dmitriy Pushkarev

  I already installed FFmpeg and this is available in terminal I can convert video and etc, but it's completely not available in PySceneDetect.

  


  pip installed FFmpeg-python and FFmpeg library and FFmpeg itself in system.

  


  PySceneDetect returns :

  


  ffmpeg could not be found on the system. Please install ffmpeg to enable video output support.


  


  I think trouble with path, but can't put path in PySceneDetect. I can use path to binary FFmpeg, only in ffmpeg-python library, like this and it's working

  


  This code working fine :

  


  Here i using only FFmpeg-python library

  


  stream = ffmpeg.input('vi0.mp4')
stream = ffmpeg.filter(stream, 'fps', fps=10, round='up')
stream = ffmpeg.output(stream, 'vi1.mp4')
ffmpeg.run(stream,cmd='./ffmpeg')


  


  But can't it to get work with PySceneDetect

  


  print(scenedetect.video_splitter.is_ffmpeg_available())


  


  return False

  


  split_video_ffmpeg(video_path, scene_list, show_progress=False)


  


  returns "ffmpeg could not be found on the system. Please install ffmpeg to enable video output support."

  


• ffmpeg converting video to images while video file is being written

  20 décembre 2018, par user3398227

  Hopefully an easy question for an ffmpeg expert !

  I’m currently converting large (+6GB) mpeg video into an image sequence - which is working well using the below ffmpeg command :

  ffmpeg -i "input.mpeg" -vf - fps=fps=2 -f image2 -qscale 1 -s 1026x768
  "output%6d.jpg"

  however i have to wait for the file to finish being written to disk before i kick off ffmpeg - but this takes a good hour or so to finish writing, but what i’ve noticed is that ffmpeg can start reading the file while its being written to disk - the only snag here is it gets to the end of the file and stops before the file has finished being written...

  Question is, is there a way that ffmpeg can convert to an image sequence at the same pace the video is being written (and not exit out ?)... or know to wait for the next frame to be written from the source. (unfortunately the input doesn’t support streaming, I only get a network drive and file to work off.. ) I thought i read somewhere that ffmpeg can process at the video frame rate but cant seem to find this command for love or money in the doco !!

  Thanks !