#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):
Replying to [comment:33 Elon Musk]:
> quaternion matrix is changed only when yaw/pitch/roll are not 0
Perfectly correct that's '''precisely''' the issue, it's being reset to
origin when reset_rot is set, and then the yaw,pitch,roll are being set to
zero, and then it's applying the commands to update the yaw,pitch,roll
with new values, if none of the commands in that command interval are
changing the yaw/pitch/roll they stay at zero and as you rightly say: no
update to the quaternion and it stays in it's reset state pointing at
origin for that axis.
For example with the command sequence:
{{{
0.0000-1.2622 [expr] v360@1 reset_rot '1', v360@1 pitch
'lerp(-15.0000,-15.0000,TI)';
1.2622-2.8044 [expr] v360@1 reset_rot '1', v360@1 pitch
'lerp(-15.0000,15.0000,TI)';
0.0000-3.6991 [expr] v360@1 reset_rot '1', v360@1 yaw
'lerp(-20.0000,-20.0000,TI)';
3.6991-4.9172 [expr] v360@1 reset_rot '1', v360@1 yaw
'lerp(-20.0000,20.0000,TI)';
}}}
Produces the attached 'Pitch reset on subsequent yaw command' example
where on execute of the yaw commands that don't mention the pitch the
pitch is reset to origin - however if the yaw/pitch/roll were not zeroed
when {{{reset_rot!=0}}} the pitch would have retained its prior value
correctly rotating to the previously specified command's angle of
15degrees upwards even as it was lerping through the yaw sweep.
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Ticket URL: <https://trac.ffmpeg.org/ticket/9447#comment:34>
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