• Compression Techniques

  Add keyframes (or cuepoints) with ffmpeg

  Posted by Laurent Polèse on March 1, 2012 at 6:53 pm

  Hello,

  I need to point to some accurate places (chapters) on a video created with ffmpeg, in various formats (flv and mp4/h264).
  But I can only point to the closest keyframe.

  This works just fine with cuepoints created with video post prod software, though cuepoints are just metadata. So I assume the software creates a keyframe at the exact same time as the cuepoint to get such accuracy.

  Unfortunately, I didn’t find out how to create cuepoints, or keyframes, with ffmpeg. I only could set global parameters for keyframes, as the frames gap between 2 keyframes. But I can’t set 10 keyframes per second just to get the needed accuracy for 3 chapters on a 20 minutes video…

  Does anyone know how I could do this, with ffmpeg or, even, with any linux command line tool ?

  Thanks 😉
  Lo

  Laurent Polèse replied 14 years, 5 months ago 1 Member · 1 Reply
• 1 Reply

• 

  Laurent Polèse

  March 9, 2012 at 3:16 pm

  Ok, found that option :
  -force_key_frames time[,time…]
  my current ffmpeg crashes when I try to use it (current Ubuntu release) but last ffmpeg release seems to work well with that.

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