[mythtv-commits] Ticket #13030: Hardware deinterlacing does not work with recent versions of raspbian

[MythTV]

#13030: Hardware deinterlacing does not work with recent versions of raspbian
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 Reporter:  pbennett              |          Owner:  pbennett
     Type:  Bug Report - General  |         Status:  accepted
 Priority:  minor                 |      Milestone:  unknown
Component:  Ports - rPi           |        Version:  0.28.1
 Severity:  medium                |     Resolution:
 Keywords:                        |  Ticket locked:  0
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Changes (by pbennett):

 * status:  new => accepted


Old description:

> Sometime after raspbian version 2016-02-09, hardware deinterlacing
> stopped working. Withe the default setting, no deinterlacing is done.
> Some settings cause the fallback deinterlacer to be used.
>
> As a work around you can select deinterlacer "Linear Blend".
>
> See also https://lists.gt.net/mythtv/users/607966
>
> Alternatively download and use a prior version of raspbian
> http://downloads.raspberrypi.org/raspbian/images/

New description:

 Sometime after raspbian version 2016-02-09, hardware deinterlacing stopped
 working. Withe the default setting, no deinterlacing is done. Some
 settings cause the fallback deinterlacer to be used.

 As a work around you can select deinterlacer "Line Double(HW)".

 See also https://lists.gt.net/mythtv/users/607966

 Alternatively download and use a prior version of raspbian
 http://downloads.raspberrypi.org/raspbian/images/

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Comment:

 I have done some testing of this bug. It looks to me like the hardware
 advanced and fast deinterlace may have stopped working with the release of
 the RPI3. I am unable to see advanced deinterlace working at all on RPI3.
 Earlier versions of raspbian will not boot on the RPI3.

 With a small test program and lots of playing around I have found that
 advanced deinterlace only works with a tunneled path from decoder to
 deinterlacer. MythTV normally has the deinterlace as part of the video
 output stage. It will have to be moved to the decoding stage for the
 appropriate tunnel to be used. I believe this may be a bug in the
 raspberry pi firmware. However the deinterlace does not seem to be
 documented anywhere other than in forum postings, so I do not know for
 sure if this is intended.

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Ticket URL: <https://code.mythtv.org/trac/ticket/13030#comment:2>
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