Disabling mmx does solve the segfault.

The cause of the problem is jpgs of different classes in my sequence. I ended up with some pseduoclass images in the sequence of largely directclass jpgs, which kill ffmpeg. With mmx enabled this results in a segfault, with mmx disabled ffmpeg just quits (return 1).


-v 10 does not give any hints about the quit, an error message would be useful when a pseudoclass jpeg in found in a sequence and exiting with an error message.

Thanks,
B. Bogart


Reinhard Tartler wrote:
"B. Bogart" <b...@ekran.org> writes:

Reinhard Tartler wrote:
this is a good indication that this bug is also present in current
trunk, i.e., this bug needs to be confirmed and upstreamed.
Compiling ffmpeg fresh for current svn also has the same problem.

okay, then this bug definitly upstreaming.

see http://ffmpeg.org/bugreports.html for details, much appreciated if
you could help us out here.

Just a try: please disable your /usr/lib/i686/cmov/ directory (e.g.,
by renaming). If this causes the symptom to disappear, then the
defect is in the hand written assembler in i386/dsputil_mmx.c
renaming the directory has not changed the result:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xf73776c0 (LWP 19789)]
0xf79c77b0 in get_pixels_mmx (block=0x85fdbf0, pixels=0x0, line_size=336)
    at
/build/siretart-ffmpeg-debian_0.svn20080206-18-i386-ZyxKlX/ffmpeg-debian-0.svn20080206-18/libavcodec/i386/dsputil_mmx.c:225
225

Hm, do we really enable mmx in the non-optimized build? I wonder if that
is a clever idea, but this would be a seperate bug anyways.

Since you already have confirmed this bug in current trunk, would you
mind to check if the symptom disappears if you run ./configure without
mmx, e.g., add the configure switch --disable-mmx?




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