[FFmpeg-trac] #10336(undetermined:new): Ultra low framerate issues

FFmpeg trac at avcodec.org
Wed Apr 26 02:47:34 EEST 2023

#10336: Ultra low framerate issues
             Reporter:  Noitarud     |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:  FPS          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 I have found two reasons to lower framerates to fractional: video is a
 splash screen only, or it is of a presentation (and moreso when the person
 is waving the camera around).
 I tested it with two music videos and I encountered some issues:

 A) Video is no longer the correct length. Will have to scale it.
 Video #1: original 4:53 @30FPS  to 5:10 @0.2FPS, or to 5:20 @0.1FPS
 Video #2: original 4:15 @23.976 to 4:30 @0.2FPS, or to 4:50 @0.1FPS
 So recommend rounding the FPS up or down to suit the length if last frame
 cannot be shorter (not to impact B below).

 B)Frame chosen as representative for the next period is at the start of
 the span not the middle.

 Quite sure I just used the -r 0.1 option only for this. Old version used
 (I did check older issues) N-64167-gca35037.
Ticket URL: <https://trac.ffmpeg.org/ticket/10336>
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