Package: libavcodec53
Version: 6:0.8.6-1
Severity: normal
Dear Maintainer,
*** Please consider answering these questions, where appropriate ***
* What led up to the situation?
Using mplayer or vlc from Debian Wheezy package
* What exactly did you do (or not do) that was effective (or
ineffective)?
I played flv file downloaded from youtube with mplayer or vlc on a computer
with K6-3+ processor.
* What was the outcome of this action?
both mplayer and vlc crash with illegal instruction signal. The instruction
that causes the crash is
=> 0xb34563b0: pminsw %mm5,%mm6
The instruction is contained in the file /usr/lib/i386-linux-
gnu/i686/cmov/libavcodec.so.53.35.0
* What outcome did you expect instead?
The file should be playable.
There are two versions of libavcodec.so.53.35.0 shipped in Debian - one in the
directory /usr/lib/i386-linux-gnu/i686/cmov/ (that is for i686 processors) and
the other in /usr/lib/i386-linux-gnu/ (that is for i586 and lower processors).
The version for i586 is miscompiled - it contains the instruction pminsw.
Note that the instruction pminsw is only present in i686-class processors - its
support starts with Pentium 3 (with SSE instruction set) and Athlon (with
MMXEXT instruction set) processors.
This instruction shouldn't be used for i586-class processors because no
i586-class processor supports it.
When I compile mplayer and ffmpeg from upstream on my own, it plays the file
correctly. Debian incorrectly compiled the package.
-- System Information:
Debian Release: 7.2
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: i386 (i586)
Kernel: Linux 3.11.7 (PREEMPT)
Locale: LANG=cs_CZ.UTF-8, LC_CTYPE=cs_CZ.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages libavcodec53 depends on:
ii libavutil51 6:0.8.6-1
ii libc6 2.13-38
ii libdirac-encoder0 1.0.2-6
ii libgsm1 1.0.13-4
ii libmp3lame0 3.99.5+repack1-3
ii libopenjpeg2 1.3+dfsg-4.6
ii libschroedinger-1.0-0 1.0.11-2
ii libspeex1 1.2~rc1-7
ii libtheora0 1.1.1+dfsg.1-3.1
ii libva1 1.0.15-4
ii libvorbis0a 1.3.2-1.3
ii libvorbisenc2 1.3.2-1.3
ii libvpx1 1.1.0-1
ii libx264-123 2:0.123.2189+git35cf912-1
ii libxvidcore4 2:1.3.2-9
ii multiarch-support 2.13-38
ii zlib1g 1:1.2.7.dfsg-13
libavcodec53 recommends no packages.
libavcodec53 suggests no packages.
-- no debconf information
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