[mythtv-commits] Ticket #13543: Corruption of recordings seems to be linked to system events

MythTV noreply at mythtv.org
Thu Feb 13 13:34:52 UTC 2020


#13543: Corruption of recordings seems to be linked to system events
----------------------------------+------------------------------
 Reporter:  jpilk                 |          Owner:  (none)
     Type:  Bug Report - General  |         Status:  new
 Priority:  minor                 |      Milestone:  needs_triage
Component:  MythTV - General      |        Version:  Master Head
 Severity:  medium                |     Resolution:
 Keywords:                        |  Ticket locked:  0
----------------------------------+------------------------------

Comment (by jpilk):

 I'm still seeing this, although it seems less frequent after I moved EIT
 scans from my main tuner. Connecting it to a system event has been awkward
 because the timings in the log are relative to the startpoint selected in
 the editor, so I tried with none selected. The only bad GOP was at 6m 2s
 from the start - with a DVB-T multirec overlap of 6m with an earlier
 recording.

 I had wondered if the problem was only apparent via my Projectx
 postprocessing, but playing the unprocessed file showed a conspicuous
 glitch at that point, while the normal output plays with a dropout that is
 often hard to spot.  It's not clear yet why other people haven't seen
 this.

 The log for the earlier recording showed no problem.

 In this case no frames were added to maintain sync.

 v32-Pre-32-1c0b76b

 {{{
 -> cut-in @ GOP# 0 / new vframe 0 / new Timecode 00:00:00.000 (417924)
 -> video basics: 704*576 @ 25fps @ 0.7031 (16:9) @ 15000000 bps - vbv 112
 -> starting export of video data @ GOP# 0
 !> dropping useless B-Frames @ GOP# 0 / new Timecode 00:00:00.000
 !> PID 0x0065 -> packet 1010160 @ pos. 189909892 out of sequence (2/1)
 (shifting counter..) (~00:06:02.360)
 !> PID 0x0066 -> packet 1010187 @ pos. 189914968 out of sequence (11/14)
 (shifting counter..) (~00:06:02.360)
 !> PID 0x0065 -> packet 1010220 @ pos. 189921172 out of sequence (4/3)
 (shifting counter..) (~00:06:02.360)
 !> ID 0xC0 (sub 0x0) packet# 3030, big PTS difference: this 149889608,
 prev. 149641208
 !> dropping GOP# 405 @ orig.PTS 00:27:42.325 (149609312), errorcode: 24
 !> Pics exp/cnt 25/28, inGOP PTS diff. 3000ms, new Timecode 00:06:02.360
 !> PTS difference of 360000 (00:00:04.000) to last exported GOP detected
 !> dropping useless B-Frames @ GOP# 406 / new Timecode 00:06:02.360
 packs: 9733803 100% 2406824504


 -> adjusting audio at video-timeline
 -> src_audio: MPEG-1, Layer2, 48000Hz, stereo, 256kbps, noCRC @
 00:00:00.000
 !> missing syncword @  11632897, @ 00:06:02.352
 !> found syncword @ 11633848
 !> missing syncword @  11634617, @ 00:06:02.352
 !> found syncword @ 11635200

 }}}

-- 
Ticket URL: <https://code.mythtv.org/trac/ticket/13543#comment:5>
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