Re: [xine-devel] [PATCH] Fix deinterlacing in video_out_xv.c

[Barry S. <bar...@on...>]

Darren Salt wrote:
> I demand that Simon Farnsworth may or may not have written...
>
>   
>> Xv drivers are permitted to return a bigger image than we asked for, to
>> work around hardware constraints. If this happens, 1.1.6's video_out_xv
>> cannot deinterlace properly. Fix this by deinterlacing based on the width
>> of the Xv image; the Xv driver will discard the extra horizontal data.
>>     
>
>   
>> Without this patch, you get a barber-pole effect if the input video is
>> interlaced *and* the Xv driver chooses to round up the width of the
>> requested image.
>>     
>
> Do you have a test case which we can try?
>
>   
You need a combination of hardware and driver for Xorg.

Use a VIA EPIA M10000 mother board and the Unichrome
driver for the CLE266 graphics chip.

The Unichrome driver rounds up the width to a multiple of 32 pixels.
This gives the driver a performance advantage (it can use DMA).
It is allowed to do this by the XV spec.

Play a standard 720x576 video to see the problem.

Barry