[FFmpeg-trac] #9455(undetermined:closed): Overlay n expression being off 1 frame
FFmpeg
trac at avcodec.org
Fri Oct 15 15:57:50 EEST 2021
#9455: Overlay n expression being off 1 frame
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Reporter: Jozef | Owner: (none)
Chutka |
Type: defect | Status: closed
Priority: normal | Component:
| undetermined
Version: 4.3.2 | Resolution: wontfix
Keywords: overlay n | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Jozef Chutka):
Thanks for your quick reactins Elon.
I was under impression that the frame numbering in my whole example should
be equal/synced for all used sources. When printing `n` with drawtext it
renders the same value for any source used.
Do I get it right that `n` in overlay starts at 1 while in all other
filters starts with `n` being 0? And so, for `scale=w=n` (`n` is i.e. 0)
while following `overlay=x=n` filter has different `n` - being 1 already.
Can you please point me to the documentation that would explain it in more
details.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9455#comment:3>
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