[Unichrome-devel] RE: [mythtv] [PATCH] xvmcvld picturequality

[Ivor Hewitt]

Cheers Thomas,

Thomas Hellström wrote:

>Hi!
>
>The QMatrix thing is a bit tricky. There really is only one correct way to
>load it, and that is from left to right, top down in the matrix.
>
>However, different decoders store it either in the zig-zag scan pattern or
>in the alternate scan pattern, and even worse adjusts thes Qmatrix layout
>to scan patterns in what may seem a totally unpredictable way ;)
>
>In Xine's libmpeg2, one has to know what scan pattern is being used and
>also the internal modification and load the VLD XvMC Qmatrix according to
>that. Code snippet: (picture>scan is the decoders modified scan pattern)
>  
>
Aha, got it. Can't test now but it should be fixed tonight, unless Terry 
gets there first.

Ivor