• Compression Techniques

  Specify frames to be extracted

  Posted by Laurent Nguyen on July 12, 2011 at 2:39 pm

  Dear forum,

  I am looking for a way to extract specific frame numbers from a movie, of course using ffmpeg. For the moment, the only thing I have found that is close to what I need is the following:

  ffmpeg -i movie.mov -ss 00:00:20 -vframes 33 im%5d.png

  With this command, I’m extracting 33 frames, with the first one starting at 00:20 seconds. However, I would like to specify the starting frame not by time but by frame number. In other words, I want to extract, say from frame #167 to #192 from my movie.

  Is there a simple way of doing this ? A virtual beer for the one who finds the answer.

  Thanks,

  Laurent

  Michael Rampe replied 15 years ago 2 Members · 1 Reply
• 1 Reply

• 

  Michael Rampe

  July 12, 2011 at 11:59 pm

  [Laurent Nguyen] “However, I would like to specify the starting frame not by time but by frame number.”

  This function only accepts time as an input. It does however accept a decimal:

  `-ss position’
  Seek to given time position in seconds. hh:mm:ss[.xxx] syntax is also supported.

  So…. If you know your frame rate, you can calculate the right time to start.

  Frame 167 in a 25 fps stream = 167/25 = 6.68 seconds.

  Thus your command would be:

  -ss 00:00:06.68

  Michael

Reply to this Discussion! Login or Sign Up