[mythtv-commits] Ticket #12907: Shaking while picture panning on Raspberry Pi

[MythTV]

#12907: Shaking while picture panning on Raspberry Pi
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 Reporter:  Josh Rosenberg <mythtv@…>  |          Owner:  pbennett
     Type:  Bug Report - General       |         Status:  new
 Priority:  minor                      |      Milestone:  unknown
Component:  Ports - rPi                |        Version:  0.28.0
 Severity:  medium                     |     Resolution:
 Keywords:                             |  Ticket locked:  0
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Comment (by pbennett):

 I looked into whether there are missing or late frames while playing the
 clip. There are 60 frames per second and one or two frames each second is
 1 ms to 16 ms late. Other frames are correct within 1 ms. When one is late
 the following frame or frames are speeded up to compensate. No frames were
 dropped. At 60 fps the frames are one every 16 ms.

 I do not know if this is enough to cause the visible shudder during
 panning.

 By comparison, the same video on an AMD64 front end has all frames at the
 correct time within less than 0.1 ms.

 I think the uneven rate on the Raspberry Pi may caused by the large amount
 of processing that is done during each frame. Also multiple threads are
 running in the frontend apart from the playback thread, and with the slow
 processors these could be causing some delay occasionally.

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Ticket URL: <https://code.mythtv.org/trac/ticket/12907#comment:1>
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