[FFmpeg-trac] #9447(avfilter:closed): avfilter/vf_v360 interprets commands as relative rotation offsets
FFmpeg
trac at avcodec.org
Thu Oct 7 22:12:35 EEST 2021
#9447: avfilter/vf_v360 interprets commands as relative rotation offsets
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Reporter: Saul Baker | Owner: (none)
Type: defect | Status: closed
Priority: normal | Component: avfilter
Version: git-master | Resolution: invalid
Keywords: v360 | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by Saul Baker):
After some testing it seems like replacing most of the functionality with
a complete history of rotational sendcmds only has a small cumulative
error offset compared to init with the same angles: it's not clear to me
if periodic '''reinit''' is supposed to work here to minimise that.
But that still leaves the issue of interpolating rotations as a gap in the
relative system I can't seem to close, I thought it may be possible to
work it out in the current [expr] and divide with the 'N' variable
populated during each sendcmd evaulation {{{lerp(a,b,TI)/N}}} but it's
seemingly the start offset of the entire video with no way to work back to
what the frame number was at the start of that specific eval interval -
the timestamps don't seem to be of any use as one would need to work in
frames rather than seconds.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9447#comment:10>
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