[Ffmpeg-devel] segfault: ff_fdct_sse2
Wed Jun 15 04:47:52 CEST 2005
On Tue, Jun 14, 2005 at 06:46:27PM -0700, RayLing Hwang wrote:
> I have stuck on this for two weeks. Someone please help out. Thansk in advance.
> 1. I wrote a small program to extract partial frames out mpeg1/2 for video preview.
> I basically followed apiexample.c and output_example.c.
> 2. I have compliled ffmpeg 0.4.9-pre1 with Msys/mingw with configure --enable_shared
> 3. It runs ok on windows 2000, but crashed on XP home-edition. But we need it to be run
> on XP home.
> 4. The crash seems to be related to program address, by changing unimportant input options(e.g. change log file name from abc.log to aaaaaaaaaaaaaaaaaa.log ) it may run
> ok sometime.
> 5. change log of ffmpeg for this release says "fdct sse2" --- is it a fix for problems like mine?
> 6. I run ffmpeg to convert our mpg files, it crashes depending on input option.
> eg, A. ffmpeg -target ntsc_vcd A.mpg runs ok
> B. ffmpeg -target ntsc_vcd B.mpg crashes
> but ffmpeg -target ntsc_vcd -s 352x288 B.mpg runs ok
> 7. decoing is fine, ffplay plays all our mpg files ok.
> 8. I have run about 10 mpeg files, all die at the same place.
> 8. Attached information from gdb
You must enable memalign hack. Windows has broken memalign which
cannot ensure that data is properly aligned for sse instructions.
Alternatively just disable sse.
More information about the ffmpeg-devel