[Bug 73457] New: mpeg4 through vdpau randomly either correct or garbled (on same file!)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73457

          Priority: medium
            Bug ID: 73457
          Assignee: dri-devel at lists.freedesktop.org
           Summary: mpeg4 through vdpau randomly either correct or garbled
                    (on same file!)
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: adam at aphirst.karoo.co.uk
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 10.0
         Component: Drivers/Gallium/r600
           Product: Mesa

Created attachment 91790
  --> https://bugs.freedesktop.org/attachment.cgi?id=91790&action=edit
mpv verbose log, when video decodes successfully

This is somewhat difficult to explain.

* AMD PALM E2-1800 APU
* Arch Linux x86_64
* Kernel 3.12.6-ck (also with vanilla 3.12.6)
* mesa 10.0.1, xf86-video-ati 7.2.0

One of the following three situations occurs, seemingly at random, when opening
an mpeg4 video file using any player which supports vdpau hardware-decoding
(e.g. mplayer r36498, VLC 2.1.2, mpv 0.3.2)

1. The video decodes and plays just fine
2. The video decodes incorrectly, with bright-green garbling, and general
smearing
3. The video decodes and plays fine, BUT with a couple of small artefacts
either in the player window, or anywhere on the screen (the artefacts are
little black squares, inside which are a few fluorescent-coloured pixels
flickering)

The interesting point is that, on the same file, you can close and re-open the
video player and receive a different random outcome each time. I'm in the habit
of trying a few times to open my .avi videos until it "just works".

This is not the same as the mpeg4 ASP garbling issue which I reported a month
or so ago, which was 100% consistent on the affected files. For this bug, the
files which display *this* problem are 'normal' mpeg4 videos, and whether or
not decoding succeeds appears to be completely random.

Frustratingly, neither the video player's verbose logs, nor the DPM messages in
dmesg, indicate anything *at all* different between successful and unsuccessful
attempts.

I'll upload to this report a couple of log files, including the outputs of
ffmpeg -i on a selection of affected files.

I'll also upload some video samples, bear with me.

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