[FFmpeg-trac] #9447(avfilter:new): avfilter/vf_v360 interprets commands as relative rotation offsets

FFmpeg trac at avcodec.org
Sun Oct 3 23:16:06 EEST 2021

#9447: avfilter/vf_v360 interprets commands as relative rotation offsets
             Reporter:  Paul Baxter  |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  git-
                                     |  master
             Keywords:  v360         |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
 Summary of the bug:

 Use sendcmd to update the yaw,pitch or roll values of the v360 filter,
 contrary to the behaviour of other filters, the value sent is interpreted
 as an offset to apply to the current value rather than a value to set the
 property to.

 This behaviour was switched in

 This makes the filter stateful and hard to deal with, for example a smooth
 pan can no longer be achieved by applying lerp between two timestamps and
 instead spins the view wildly, generally position cannot be set to a known
 value without tracking an external copy of the rotation state.

 The stateful 'relative rotation' approach seems at odds with the other
 filter behaviours that set the filter values rather than mutate them.
Ticket URL: <https://trac.ffmpeg.org/ticket/9447>
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