[mythtv-commits] Ticket #10212: Transcoded recordings playback broken (stutters, audio failure) during November commits

MythTV noreply at mythtv.org
Sun Feb 19 03:24:15 UTC 2012


#10212: Transcoded recordings playback broken (stutters, audio failure) during
November commits
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 Reporter:  jk90090@…                |          Owner:  danielk
     Type:  Bug Report - General     |         Status:  assigned
 Priority:  minor                    |      Milestone:  unknown
Component:  MythTV - Video Playback  |        Version:  Unspecified
 Severity:  medium                   |     Resolution:
 Keywords:  transcoded recordings    |  Ticket locked:  0
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Comment (by Andrew Leech <andrew@…>):

 This sounds like the exact same problem I'm having, with medibuntu daily
 build (v0.25pre-4564-g1fc5ed1)
 This appears to happen for me on new recordings (dvb-t) as well as
 transcoded ones, but get worse once transcoded.

 The defining points to me seem to be:
 "Enabling buffering optimisations for low bitrate stream."

 before a lot of consecutive:

 "Player(3): Waited 225ms for video buffers
 AAAAAAAAAAAAAAAAAAAAuAAAAAAAAAAP"

 and similar, whenever skipping is going on.

 Changing the HD Ringbuffer size makes no difference, nor do realtime
 threads or the audio buffering setting.
 I've switched from nvidia vdpau to xvid to opengl to intel vaapi (onboard)
 and had no change.

 The skips always happens at exactly the same point in recordings, usually
 for ~10 - 20 seconds before being fine for a while.
 Similarly, I tried moving the file from one hard drive to another and
 still no change, same skip points.

 Crucially, I also found on the new playback stats available through the
 OSD, the "available video buffer", which normally sits around 80%-90%
 during playback, drops to 0% during the skips.
 I haven't found much information about what this stat actually refers to
 yet, although I'm guessing it's the video buffer that's now automatically
 sized (optimised)?

 Andrew

-- 
Ticket URL: <http://code.mythtv.org/trac/ticket/10212#comment:28>
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