[FFmpeg-devel] speed regression in ffmpeg/mpeg2video

[vmrsss]

On 9 Mar 2009, at 04:12, compn wrote:
> could you please give us the url to the page or document which says
> that ffmpeg-devel is the place for bug reports?

It is just enough to look at last week's threads to see that your  
statement unnecessarily restrictive and in fact incorrect. As I  
understand it, FFmpeg-devel is for developer matters, and crashes and  
regressions are just one of those matters. Mine is not a bug report,  
it is testing.

Anyway, more than arguing against me, perhaps some of the developers  
will find useful the following two crash logs as a further indication  
that there might something to look at in swscale.c for x86_64. Let me  
know if there is anything more I can do (eg in terms of gdb stack  
traces) to be of assistance.

Regards to all.

> Process:         ffmpeg [42212]
> Path:            /usr/local/bin/ffmpeg
> Identifier:      ffmpeg
> Version:         ??? (???)
> Code Type:       X86-64 (Native)
> Parent Process:  bash [8245]
>
> Date/Time:       2009-03-08 18:50:41.036 +0000
> OS Version:      Mac OS X 10.5.6 (9G55)
> Report Version:  6
>
> Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
> Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000000
> Crashed Thread:  0
>
> Thread 0 Crashed:
> 0   ffmpeg                     	0x0000000100385671  
> add_pixels_clamped_mmx + 721
> 1   ???                           	0x00000240000002d0 0 +  
> 2473901163216
>
> Thread 0 crashed with X86 Thread State (64-bit):
>  rax: 0xfffffffffffffd00  rbx: 0x00000000ffffffff  rcx:  
> 0x0000000000000007  rdx: 0x0000000000000007
>  rdi: 0x0000000000000300  rsi: 0x000000010180a8ca  rbp:  
> 0x0000000101275000  rsp: 0x00007fff5fbfd818
>   r8: 0x0000000101275000   r9: 0x0000000000000000  r10:  
> 0x0000000000000000  r11: 0x0000000000000004
>  r12: 0x0000000000000000  r13: 0x0000000000000010  r14:  
> 0x0000000000000010  r15: 0x0000000101806200
>  rip: 0x0000000100385671  rfl: 0x0000000000010206  cr2:  
> 0x0000000000000000

> Process:         ffmpeg [828]
> Path:            /usr/local/bin/ffmpeg
> Identifier:      ffmpeg
> Version:         ??? (???)
> Code Type:       X86-64 (Native)
> Parent Process:  sh [827]
>
> Date/Time:       2009-03-09 02:48:10.623 +0000
> OS Version:      Mac OS X 10.5.6 (9G55)
> Report Version:  6
>
> Exception Type:  EXC_BAD_INSTRUCTION (SIGILL)
> Exception Codes: 0x0000000000000001, 0x0000000000000000
> Crashed Thread:  0
>
> Thread 0 Crashed:
> 0   ffmpeg                     	0x00000001007bac8e  
> sws_getDefaultFilter + 8206
>
> Thread 1:
> 0   libSystem.B.dylib             	0x00007fff80665d02  
> __semwait_signal + 10
>
> Thread 2:
> 0   libSystem.B.dylib             	0x00007fff80665d02  
> __semwait_signal + 10
>
> Thread 3:
> 0   libSystem.B.dylib             	0x00007fff80665d02  
> __semwait_signal + 10
>
> Thread 4:
> 0   libSystem.B.dylib             	0x00007fff80665d02  
> __semwait_signal + 10
>
> Thread 5:
> 0   libSystem.B.dylib             	0x00007fff80665d02  
> __semwait_signal + 10
>
> Thread 6:
> 0   libSystem.B.dylib             	0x00007fff80665d02  
> __semwait_signal + 10
>
> Thread 0 crashed with X86 Thread State (64-bit):
>  rax: 0x0000000000000170  rbx: 0x000000000000000f  rcx:  
> 0x000000000000000f  rdx: 0x0000000000000010
>  rdi: 0x0000000000000170  rsi: 0x000000000000000f  rbp:  
> 0x0000000101843372  rsp: 0x00007fff5fbfd0c0
>   r8: 0x000000010213f800   r9: 0x0000000101320fd0  r10:  
> 0x0000000000000170  r11: 0x0000000101841d02
>  r12: 0x000000000000023b  r13: 0x0000000000000000  r14:  
> 0x0000000000000000  r15: 0x0000000101273000
>  rip: 0x00000001007bac8e  rfl: 0x0000000000010202  cr2:  
> 0x000000010215c000