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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