[mythtv-commits] Ticket #11326: During playback of glitching HD-PVR recording, srt captions sometimes reset to time=0

[MythTV]

#11326: During playback of glitching HD-PVR recording, srt captions sometimes reset
to time=0
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 Reporter:  mythwiki@…            |          Owner:  stichnot
     Type:  Bug Report - General  |         Status:  accepted
 Priority:  minor                 |      Milestone:  unknown
Component:  MythTV - Captions     |        Version:  0.25.2
 Severity:  low                   |     Resolution:
 Keywords:                        |  Ticket locked:  0
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Comment (by mythwiki@…):

 I've examined a case of this in more detail.  The recording where this
 happened did experience a HD-PVR reset.  This seems to happen to me when
 there's a problem in the originating station, they get some momentary
 dropouts, and my STB produces something that causes the HD-PVR to give up
 on it.  It doesn't seem to be an HD-PVR hardware issue, as it happens only
 with certain channels, and when it does, I can hook up the TV directly to
 the STB and see that there's heavy pixellation and often sound drop-outs
 on the particular channel that caused the problem.

 So, the backend log showed:
 {{{
 E DeviceReadBuffer DeviceReadBuffer.cpp:513 (Poll) DevRdB(/dev/hdpvr):
 Poll giving up 2
 E RecThread mpegrecorder.cpp:1010 (run) MPEGRec(/dev/hdpvr): Device error
 detected
 }}}
 which indicates that the HD-PVR read loop is being closed and restarted.
 This had the effect of resetting PTS/DTS to zero.  The captions then
 restart from zero.  This bad time synchronization manifests even if the
 user skips over the broken part of the file, or exits the viewer and
 restarts it from the bookmark.

 As theorized by stichnot in IRC, it seems that the reset of PTS/DTS to
 zero is being sent to the captioning system and making it think we've
 jumped to the beginning of the recording.

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Ticket URL: <http://code.mythtv.org/trac/ticket/11326#comment:2>
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