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<base href="https://bugzilla.gnome.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_UNCONFIRMED "
title="UNCONFIRMED - decodebin: race between setting use-buffering and max-size-time"
href="https://bugzilla.gnome.org/show_bug.cgi?id=744308">744308</a>
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<th>Summary</th>
<td>decodebin: race between setting use-buffering and max-size-time
</td>
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<th>Classification</th>
<td>Platform
</td>
</tr>
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<th>Product</th>
<td>GStreamer
</td>
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<th>Version</th>
<td>1.4.5
</td>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>UNCONFIRMED
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>Normal
</td>
</tr>
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<th>Component</th>
<td>gst-plugins-base
</td>
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<th>Assignee</th>
<td>gstreamer-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>dpalmer@digisoft.tv
</td>
</tr>
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<th>QA Contact</th>
<td>gstreamer-bugs@lists.freedesktop.org
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</tr>
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<th>GNOME version</th>
<td>---
</td>
</tr></table>
<p>
<div>
<pre>I'm using uridecodebin to play some HLS content, and have the 'use-buffering'
property set to TRUE, and also set 'buffer-duration' and 'buffer-size'.
On a variant switch, a new decode group is created in the decodebin. When this
decode group becomes active, the use-buffering property on the multiqueue in
that group is set to TRUE, and then the max-size-time property is changed from
10 seconds (set when the multiqueue is created) to buffer-duration seconds (3.5
seconds in my case). Buffering messages are sometimes emitted by the multiqueue
in the window between setting use-buffering and max-size-time - there's a race.
This can clearly be seen in the log snippet below, which is filtered for
clarity:
decodebin
gstdecodebin2.c:3671:gst_decode_group_reset_buffering:<decodebin0> Group reset
buffering 0x8fb828 multiqueue9
multiqueue gstmultiqueue.c:977:gst_multi_queue_post_buffering:<multiqueue9>
Going to post buffering: 80%
decodebin gstdecodebin2.c:3190:decodebin_set_queue_size:<multiqueue9> use
buffering 1
decodebin gstdecodebin2.c:3234:decodebin_set_queue_size:<multiqueue9>
setting limits 9175040 bytes, 0 buffers, 3500000000
multiqueue gstmultiqueue.c:938:update_buffering:<multiqueue9> buffering 230
percent</pre>
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