[mythtv-users] A test for anyone using vdpau on 32-bit x86, especially with 30.0

[Tom Dexter]

On 5/19/19, Tom Dexter <digitalaudiorock at gmail.com> wrote:
> I'm trying to narrow down some vdpau decode issues with some (but not
> all) h264 videos as discussed here:
>
> https://lists.gt.net/mythtv/users/625246
>
> I could use a favor in the form of a quick test from anyone here is
> using vdpau on 32 bit x86...especially anyone running version 30.0. If
> you could try playing this clip:
>
> http://jell.yfish.us/media/jellyfish-60-mbps-hd-h264.mkv
>
> ...and see if it falls back to software decoding or if it uses vdpau.
> For example from the playback menu Playback -> Playback Data, and see
> if it shows "H264 vdpau" or "H264 ffmpeg". That would be a huge help.
>
> The failure of the vdpau decode for me seems to be related to the
> change in 30.0 to replace the ffmpeg avcodec_decode_video2 call with 2
> calls...one of which (avcodec_send_packet) is returning an
> AVERROR_INVALIDDATA error causing the fallback to software. I'm only
> guessing that it might be a 32 bit specific issue, because Peter (see
> the related bug) couldn't reproduce the failures.
>
> The videos where I have issues decode and play fine with xine using
> vdpau, and I just verified that the version of xine-libs I'm using is
> still using the old avcodec_decode_video2 as was MythTV 29.1.
>
> Thanks in advance!
> Tom
>
I've added a few notes regarding tests I've done to the related bug:

https://code.mythtv.org/trac/ticket/13223

As noted there I've also reverted to 29.1 and can confirm that the
problem videos play with vdpau decoding just fine. Again, I have no
idea as to whether this is possibly a 32-bit only issue or not, but
I'm hoping someone else might be able to duplicate the issue. Thanks!

Tom