Opened 13 years ago
Last modified 13 years ago
#1833 new defect
mencoder crashing in swscale for some videos
| Reported by: | Owned by: | reimar | |
|---|---|---|---|
| Priority: | normal | Component: | ve |
| Version: | HEAD | Severity: | major |
| Keywords: | Cc: | cehoyos | |
| Blocked By: | Blocking: | ||
| Reproduced by developer: | no | Analyzed by developer: | no |
Description
I have a couple of samples where mencoder is crashing when encoding to raw MOV using lavf. mencoder log attached, along with gdb backtrace and valgrind log.
From the valgrind log it looks like swscale is reading off the end of a packet.
Sample uploaded to incoming/swscale-crash/mpeg1-crash.mpg
Command line used was:
mencoder -v mpeg1-crash.mpg -of lavf -lavfopts format=mov -ovc raw -vf format=uyvy -ffourcc 2vuy -sws 9 -nosound -o t.mov
Attachments (3)
Change History (8)
by , 13 years ago
| Attachment: | valgrind.log.txt added |
|---|
comment:1 by , 13 years ago
comment:2 by , 13 years ago
comment:3 by , 13 years ago
| Cc: | added |
|---|
While I see no crash, I can reproduce the invalid reads (but not with FFmpeg):
$ valgrind mencoder mpeg1-crash.mpg -of lavf -lavfopts format=avi -ovc raw -vf format=uyvy -nosound -o /dev/null
...
==1300== Invalid read of size 4
==1300== at 0x87C6456: hScale_MMX2 (swscale_template.c:2051)
==1300== Address 0xc06cfdd is 196,605 bytes inside a block of size 196,608 alloc'd
==1300== at 0x6CF8E9E: memalign (in /usr/lib64/valgrind/vgpreload_memcheck-x86-linux.so)
==1300== by 0x6CF8EFB: posix_memalign (in /usr/lib64/valgrind/vgpreload_memcheck-x86-linux.so)
==1300== by 0x87A6990: av_malloc (mem.c:83)
==1300==
==1300== Invalid read of size 4
==1300== at 0x87C6452: hScale_MMX2 (swscale_template.c:2051)
==1300== Address 0xc06cfde is 196,606 bytes inside a block of size 196,608 alloc'd
==1300== at 0x6CF8E9E: memalign (in /usr/lib64/valgrind/vgpreload_memcheck-x86-linux.so)
==1300== by 0x6CF8EFB: posix_memalign (in /usr/lib64/valgrind/vgpreload_memcheck-x86-linux.so)
==1300== by 0x87A6990: av_malloc (mem.c:83)
$ valgrind ffmpeg -i mpeg1-crash.mpg -vcodec rawvideo -pix_fmt uyvy422 -f avi -y /dev/null
(0 errors)
comment:4 by , 13 years ago
comment:5 by , 13 years ago
(In reply to comment #3)
While I see no crash, I can reproduce the invalid reads (but not with FFmpeg):
It crashes for me with mencoder compiled for 32bit, 64bit does not crash.
valgrind log