On Wed, May 25, 2011 at 4:51 PM, Marco Mattiolo
> Il 25/05/2011 08:47, Reinhard Tartler ha scritto:
>> Can you please try the ffmpeg package from experimental (0.7) as well?
>> In any case, please share the .flv file, we really need to be able to
>> reproduce ourselves.
> Ok: ffmpeg from experimental works.
> The problem isn't video-specific, today I tried plenty of videos downloaded
> with youtube-dl, and all weren't able to convert into vorbis using ffmpeg.
> So I looked for a tiny video to attach, you can also get typing "youtube-dl
> Il 25/05/2011 01:29, Romain Beauxis ha scritto:
>> Hi all,
>> I ran into a similar bug in the recent past that was due to frame
>> memory not being aligned. Memory alignment is required to use SSE
>> optimisations. Maybe that is the issue here too?
> I don't know: how could I check it?
> Thank you
> pkg-multimedia-maintainers mailing list
Note the following news of a recent upload of eglibc.
eglibc (2.13-3) unstable; urgency=low
Starting with version 2.13, eglibc provides an SSSE3 optimized version
of memcpy() on the amd64 architecture. This version might copy memory
backward in some conditions, which causes issues if the source and
destination overlap. memmove() should be used in such cases, but some
programs still wrongly use memcpy().
For this reason, on the amd64 architecture the Debian package provides
two wrappers which can be use to workaround and/or debug the issue:
- /usr/lib/libc/memcpy-preload.so simply replace all calls to memcpy()
by a call to memmove()
- /usr/lib/libc/memcpy-syslog-preload.so does the same, but in addition
logs (with rate limit) the issue to syslog, so that it can be
detected and fixed.
To use these wrapper on a single binary, the easiest way is to use the
LD_PRELOAD environment variable:
- LD_PRELOAD=/usr/lib/libc/memcpy-preload.so /path/to/binary
- LD_PRELOAD=/usr/lib/libc/memcpy-syslog-preload.so /path/to/binary
For system-wide usage, it is possible to add the path of one of the
wrapper to /etc/ld.so.preload.
For more details about the issue, please see:
-- Aurelien Jarno <aure...@debian.org> Wed, 11 May 2011 22:15:31 +0200
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