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

[FFmpeg]

#10336: Ultra low framerate issues
-------------------------------------+-------------------------------------
             Reporter:  Noitarud     |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:  FPS          |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
Description changed by Noitarud:

Old description:

> 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.

New description:

 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, last frame central to regular
 size span or last frame).

 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.

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Ticket URL: <https://trac.ffmpeg.org/ticket/10336#comment:1>
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