[mythtv-users] Playback problem with VDPAU

Christopher Kerr mythtv at theseekerr.com
Mon Sep 19 00:47:38 UTC 2011

On Mon, Sep 19, 2011 at 7:18 AM, Michael T. Dean
<mtdean at thirdcontact.com> wrote:
> On 09/18/2011 09:58 AM, Christopher Kerr wrote:
>> On Sun, Sep 18, 2011 at 10:40 PM, Michael T. Dean wrote:
>>> (Note, though, that resolution isn't really a good indicator of resource
>>> requirements for those who have mixed video CODECs or very-different
>>> bitrates of same-CODEC videos.  So, you may just want to find the
>>> profile settings that work on all videos and use it on all videos.)
>> Are you sure about that? Since deinterlacing is performed after the
>> video is decoded, shouldn't resource requirements (for deinterlacing
>> alone) be proportional to resolution regardless of the original codec?
>> Obviously that's an approximation, but if decoding is being offloaded
>> to VDPAU, it seems like it ought to be a good one?
> Here, I was talking about decoding and deinterlacing in general.
> Because he's using VDPAU, all the deinterlacers are "hardware"
> deinterlacers, so the same thing doing the decoding is going to be doing
> the deinterlacing.

Except not - VDPAU decoding is done by an ASIC, whilst the
deinterlacing is handled by the shader hardware. The resources used by
the two processes are entirely independent.

- Chris

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