[Bug 736965] segfault in shmsrc ! matroskademux ! videoconvert

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=736965
  GStreamer | gst-plugins-bad | 1.4.1

--- Comment #2 from Jan Alexander Steffens (heftig) <jan.steffens at gmail.com> 2014-12-08 13:00:17 UTC ---
Seems to be a problem with matroskademux not creating aligned video buffers if
it is pushed a whole frame in a single buffer. Tested using the following
setup:

Create a test file:

gst-launch-1.0 videotestsrc num-buffers=100 ! video/x-raw,format=I420 !
matroskamux ! filesink location=foo.mkv

With a small blocksize matroskademux creates perfectly sized and aligned
buffers and everything is fine:

GST_DEBUG="GST_MEMORY:LOG" gst-launch-1.0 pushfilesrc
real-filesrc::blocksize=4096 real-filesrc::location=foo.mkv ! matroskademux !
videoconvert ! video/x-raw,format=UYVY ! fakesink

gstmemory.c:137:gst_memory_init: new memory 0x13ff640, maxsize:115208 offset:0
size:115208

With a blocksize large enough to capture an entire frame, matroskademux creates
buffers using unaligned child memory and videoconvert crashes:

GST_DEBUG="GST_MEMORY:LOG" gst-launch-1.0 pushfilesrc
real-filesrc::blocksize=256000 real-filesrc::location=foo.mkv ! matroskademux !
videoconvert ! video/x-raw,format=UYVY ! fakesink

gstmemory.c:137:gst_memory_init: new memory 0x7fd5ac0061c0, maxsize:256007
offset:437 size:115200

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