[gstreamer-bugs] [Bug 579912] New: [decodebin2] multiqueue is too small in time (interleave issues)
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Wed Apr 22 23:39:33 PDT 2009
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GStreamer | gst-plugins-base | Ver: git
Summary: [decodebin2] multiqueue is too small in time (interleave
AssignedTo: gstreamer-bugs at lists.sourceforge.net
ReportedBy: bilboed at gmail.com
QAContact: gstreamer-bugs at lists.sourceforge.net
GNOME version: Unspecified
GNOME milestone: Unspecified
Now that totem uses playbin2 (and decodebin2), an issue I never noticed has
just popped up.
In decodebin2, during preroll (filling up the stream groups) the max-size-time
of the multiqueue is 5s, allowing pretty much every heavily interleaved file to
be prerolled correctly...
... but then when that group is exposed, the max-size-time is set back to 2s
... which makes all files with an interleave greater than 2s screw up massively
(read: qos kicks in, stuttery playback with low bandwith/cpu-usage but high
The max-size-time limit is too low for most files.
My proposal is, when exposing the gruops, to *not* modify the max-size-time
(i.e. leaving it at the 5s initial value) but still reduce the
With that modification, the 100+ files I tested which have that regression now
I'm marking this as a blocker, otherwise we're going to have a *really* bad
experience with playbin2 (and totem now it supports it) for the next 3 months.
This doesn't prevent us from doing the *proper* fix which is for demuxers to
output GST_EVENT_BUFFER_SIZE events with their interleave parameters and
multiqueue taking them into account for its limits (i.e. ending up with the
perfect multiqueue limits).
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