[gstreamer-bugs] [Bug 579692] New: mp3_type_find is over-optimistic
bugzilla-daemon at bugzilla.gnome.org
Tue Apr 21 00:42:22 PDT 2009
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GStreamer | gst-plugins-base | Ver: 0.10.21
Summary: mp3_type_find is over-optimistic
AssignedTo: gstreamer-bugs at lists.sourceforge.net
ReportedBy: arnout at mind.be
QAContact: gstreamer-bugs at lists.sourceforge.net
GNOME version: Unspecified
GNOME milestone: Unspecified
Typefind may identify an H.264 stream as an MPEG-1 audio stream (with a low
probability) when it has not yet received sufficient data to identify it as an
I'll attach a sample stream. With
gst-launch -v filesrc location=foo.h264 ! typefind ! fakesink silent=true
it finds caps = video/x-h264
gst-launch -v filesrc location=foo.h264 ! queue ! typefind ! fakesink
it finds caps = audio/mpeg, mpegversion=(int)1, layer=(int)1
The queue makes typefind operate in push mode, so it is (initially) limited to
the first 4096 bytes, which don't contain sufficient H.264 slice headers yet to
identify it. mp3_type_find sets the probability at 20 so it wins.
I haven't tried with git head but (looking at the diffs of typefindfunctions.c)
don't see how it would make a difference.
Proposed patch will follow
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