[mythtv-users] Does VDPAU decoding require dimensions that are a particular multiple of pixels?

[Yianni]

> I've seen this bug report from November 3
> 
>   Ticket #12531: vdpau segfaults when video dimensions not multiple of 16
> 
> and assume that it -is- a bug, and that the dimensions may be more
> tightly specified, but how tightly does the spec claim?  I haven't
> been able to figure this out.  (I know that myth != spec, but assume
> that, modulo bugs, adhering to the spec is good enough.)
> 
> I don't [yet] have a VDPAU implementation to test against, but I'd
> like to not be unpleasantly surprised later if I happen to pick bad
> crop values.  I'd also like to not crop way more loosely than I
> otherwise might want to.
> 
> Thanks.

Hi, 

I am the creator of this bug report, and I cannot verify anything code related, but the problematic behaviour is persistent on my system.
The segfault seems to occur in the libvdpau_nvidia.so.352.41 library, as shown in the ticket, so I don't know if it's mythtv's or nvidia's problem. Vlc has no problem, though.

I use handbrakecli to transcode recordings/videos and I've updated the command with "--loose-crop 15 --modulus 16", which avoids the problem by cropping no more than 15 pixel lines.

I don't know if it's even possible, but it would be ideal if mythtv could check the frame size before feeding it to vdpau and crop it accordingly.

Yianni.

 		 	   		  
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