[Bug 462189] [NEW] libavcodec.so.52 crashes while using a webcam

[TTL]

Public bug reported:

Binary package hint: libavcodec52

What happened:
1. Start vlc. 2. Open with recording mode "PVR" the /dev/video0 device. After some time a strange behavior starts: playing stops/crashes/windows can't be closed.
At first the video playback "woks", but has a very low framerate, with partly updated images and sometimes false colors. Moreover when playback runs, the "gnome-power-manager"suddenly gets started (i use KDE and never have seen such a behavior before).

Expected behavior:
Even if a Webcam may be the wrong device for "PVR", a crash is alway a bug, which may not happen.

System:
lsb_release -rd
Description:    Ubuntu 9.04
Release:        9.04
uname -r
2.6.28-16-generic

libavcodec52 Version:
3:0.svn20090303-1ubuntu6

lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 002: ID 0ac8:305b Z-Star Microelectronics Corp. ZC0305 WebCam
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

The first three tries I got a segmentation fault. On the fourth I got a
not-closeable XVideo Output Window.

I tried to backtrace this with gdb, unfortunately there are no debugging
symbols to install:

[00000409] pvr access error: Failed to write 1 new capture card settings.
[New Thread 0xad607b90 (LWP 5886)]
[New Thread 0xace06b90 (LWP 5887)]
[New Thread 0xabd7bb90 (LWP 5888)]
[Thread 0xabd7bb90 (LWP 5888) exited]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xad607b90 (LWP 5886)]
0xad7023d0 in ff_mjpeg_decode_sos () from /usr/lib/i686/cmov/libavcodec.so.52
(gdb) backtrace full
#0  0xad7023d0 in ff_mjpeg_decode_sos () from /usr/lib/i686/cmov/libavcodec.so.52
No symbol table info available.
#1  0x00001010 in ?? ()
No symbol table info available.
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

** Affects: ffmpeg (Ubuntu)
     Importance: Undecided
         Status: New

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libavcodec.so.52 crashes while using a webcam
https://bugs.launchpad.net/bugs/462189
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