Doom9's Forum - View Single Post - Trimmed direct stream copy larger than source. Why?

raffriff42 · 24th December 2013, 19:19

Well, I trimmed a very similar MJPEG video (created by AfterBurner) and the size decreased as one would expect. I have no idea why yours is increasing. Maybe Virtualdub rebuilt the AVI index? Maybe the original was incomplete, or Vdub converted it to the 'new' OpenDML type?

EDIT duplicate frames sounds likely - except I thought 'direct stream copy' meant just that. Downloading your sample...

EDIT In your AVI Info boxes above, note "frames" = "keyframes", meaning there are no null or dropped frames.

24th December 2013, 19:19	#7 \| Link
raffriff42 Retried Guesser Join Date: Jun 2012 Posts: 1,373	Well, I trimmed a very similar MJPEG video (created by AfterBurner) and the size decreased as one would expect. I have no idea why yours is increasing. Maybe Virtualdub rebuilt the AVI index? Maybe the original was incomplete, or Vdub converted it to the 'new' OpenDML type? EDIT duplicate frames sounds likely - except I thought 'direct stream copy' meant just that. Downloading your sample... EDIT In your AVI Info boxes above, note "frames" = "keyframes", meaning there are no null or dropped frames. Last edited by raffriff42; 24th December 2013 at 19:42.