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<base href="https://bugs.freedesktop.org/" />
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [VP2] Chroma planes are vertically stretched during VDPAU playback"
href="https://bugs.freedesktop.org/show_bug.cgi?id=82255">82255</a>
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<th>Assignee</th>
<td>nouveau@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>[VP2] Chroma planes are vertically stretched during VDPAU playback
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Reporter</th>
<td>emil.l.velikov@gmail.com
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Component</th>
<td>Drivers/DRI/nouveau
</td>
</tr>
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<th>Product</th>
<td>Mesa
</td>
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<pre>Created <span class=""><a href="attachment.cgi?id=104158" name="attach_104158" title="VDPAU_TRACE=1 vlc">attachment 104158</a> <a href="attachment.cgi?id=104158&action=edit" title="VDPAU_TRACE=1 vlc">[details]</a></span>
VDPAU_TRACE=1 vlc
Using VLC and flashplayer causes h264 video streams to be incorrectly rendered.
Both chroma planes are stretched and wrapped over vertically (x2) while the
luma plane seems correct.
Note: the issue does not appear with every h264 encoded clip and never happens
with mplayer (a bug in mplayer perhaps ?).
The following clip [1] is known to exhibit the issue, attaching VDPAU_TRACE=1
log of VLC playback.
How to enable/force VLC (v2.1.5) + VDPAU:
- Fire up VLC
- Navigate to Tools>Preferences>Input/Codecs
- Set "Hardware-accelerated decoding to VDPAU.
- Save and play a video.
If VDPAU is seemingly unused by VLC (high CPU usage), check the VLC log:
- Navigate to Tools>Messages
- Change the Verbosity level to "2(debug)". Elapsed events/messages with
higher level are not stored, as such you will need to restart playback.
Last minute update:
Interesting... seem like for every h264 clip that I can find, VLC exhibits this
problem. I have a sneaky suspicion that VLC is using xcb_xv for presentation,
which could have something to do with all this.
-Emil
[1] "Fantastic Four: Rise of the Silver Surfer – 720p Trailer" from
<a href="http://www.h264info.com/clips.html">http://www.h264info.com/clips.html</a>
<a href="http://downloads.dvdloc8.com/trailers/divxdigest/fantastic_four_rise_of_the_silver_surfer-trailer.zip">http://downloads.dvdloc8.com/trailers/divxdigest/fantastic_four_rise_of_the_silver_surfer-trailer.zip</a></pre>
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