[mythtv-commits] Ticket #11358: HDPVR - Green line on 1080i play back

[MythTV]

#11358: HDPVR - Green line on 1080i play back
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 Reporter:  bernhart2002@…           |          Owner:  stichnot
     Type:  Bug Report - General     |         Status:  closed
 Priority:  minor                    |      Milestone:  0.26.1
Component:  MythTV - Video Playback  |        Version:  0.26-fixes
 Severity:  medium                   |     Resolution:  fixed
 Keywords:                           |  Ticket locked:  0
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Comment (by mark.kendall@…):

 Jim

 This is a mess.

 - h264 streams do not reliably provide cropping information.

 - other codecs can and do have 1088 line video. There are plenty of mpeg2
 samples in the wild. Relying solely on h264 stream parsing isn't going to
 work and afaik, mpeg2, for example, does not give you any cropping hints.

 - the video output code has accounted for the 1088/1080 issue for years.
 The bottom 8 lines are not displayed so applying a crop filter is a waste
 of time (not least because the issue is only reported with VDPAU, which
 you haven't dealt with).

 You may have stumbled upon a fix somewhere that is picking up on a
 1080/1088 transition, but fundamentally this looks like a VDPAU
 interlacing issue:-

 - it doesn't happen with progressive content
 - it's one green line - suggesting the deinterlacer is referencing memory
 outside of the defined 'frame' area.
 - the blank screen/flash is a classic symptom of display pre-emption in
 the VDPAU library - which is supported by the original log.
 - the pre-emption could be triggered by the 1080/1088 change (and hence
 may have been inadvertently fixed somewhere along the line)

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Ticket URL: <http://code.mythtv.org/trac/ticket/11358#comment:20>
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