[gstreamer-bugs] [Bug 171796] New: Green artifacting on powerpc (DivX MS-MPEG-4 Version 3)

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 http://bugzilla.gnome.org/show_bug.cgi?id=171796
 GStreamer | gst-ffmpeg | Ver: 0.8.4

           Summary: Green artifacting on powerpc (DivX MS-MPEG-4 Version 3)
           Product: GStreamer
           Version: 0.8.4
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-ffmpeg
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: ggi at btinternet.com
         QAContact: gstreamer-bugs at lists.sourceforge.net
                CC: seb128 at debian.org,all-bugs at bugzilla.gnome.org


Distribution/Version: Ubuntu 5.04 (preview)

When I attempt to play a particular video on my iBook (I've only tested the one
video on it), the video output gradually turns more green before reverting to
the normal colours every few seconds. There's also quite a lot of green
replacing different hues in later sections of the video. It plays fine on x86.

The particular video is "Spectrum Diamond", an Italian documentary on Matthew
Smith, who wrote Manic Miner and Jet Set Willy for the ZX Spectrum. It's
available here, but it's 402MB: http://zxvideos.speccy.cz/matt.avi

I can't be sure how legal that is, although it seems that it was distributed by
the producers for some time. Here's some links to screenshots (from Totem):

Video starts, colours are normal:
http://wired.st-and.ac.uk/~gingram/spectrum_diamond/gst-ffmpeg_normal_ppc.png

A few seconds later, everything goes green:
http://wired.st-and.ac.uk/~gingram/spectrum_diamond/gst-ffmpeg_green_ppc.png

An example of more green artifacts later in the video:
http://wired.st-and.ac.uk/~gingram/spectrum_diamond/gst-ffmpeg_more_green_artifacts.png

#gstreamer IRC transcript, for the benefit of seb128:
---
BBB | ggi, gst-ffmpeg 0.8.3 or .4?
BBB | I've heard from some people that ffmpeg indeed has faulty PPC
optimizations, i.e. they don't work... but that's an upstream bug, apparently...
BBB | but I thought I disabled it in .4 (because of that)
ggi | BBB: 0.8.4, from Ubuntu hoary.
BBB | grmbl
BBB | ok, then I failed to disable it
BBB | ... :(
ggi | BBB: Will I file a bug?
BBB | Sure
BBB | CC seb128 at debian.org
BBB | he maintains the ubuntu pkg, iirc
ggi | BBB: Ok, doing so.
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