[mythtv] Red/blue colour swap on XvMC VLD

Robin Gilks g8ecj at gilks.org
Mon Apr 30 08:41:07 UTC 2007

> On Sun, 2007-04-29 at 20:53 +1200, Robin Gilks wrote:
>> Greetings
>> I've found that if I use mencoder to encode a track from a DVD the red
>> and
>> blues get swapped round on my CN400 based Epia SP13000 when using the
>> Internal player.
>> The display is fine in mplayer and it seems to make no difference
>> changing
>> to Standard or libmpeg2 as the display driver so I assume its something
>> to
>> do with the Unichrome chipset. The tracks play OK on my nvidia based box
>> with the Internal player.
>> Does anyone know if this has been fixed in the -vid branch? - I'm
>> currently running r13317 from SVN head.
> This is probably an XVideo driver bug. There is a define in
> videoout_xv.cpp which will do an color swap to get around
> buggy drivers. This happens with the ATI proprietary drivers
> which advertise I420 support, but implement it as YV12. But
> since the openchrome drivers are GPL this should be easy to
> fix in the driver.
> BTW The reason mplayer is working is because it tries YV12
> first, while we try I420 first.

No go unfortunately - I've still got blue faces :-(

Attached is a bzipped playback log of opening the avi file, jumping
forwards a couple of 10min skips and exiting.

Robin Gilks

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