On Sun, 2 Oct 2005, Frank Albrecht wrote:
> > What does a gdb backtrace look show? Perhaps knowing where the
> > fault is happening will provide an idea what area to investigate.
>
> Puh, I don't know how to do that.
gdb yourprogram
run program_args
when the fault happens type 'where':
where
That wasn't so hard, was it? :-)
> My idea was to do ltrace because of library related problem:
That's a good start. One problem with tracing system calls is that
a program doesn't fault at a "system call" (such as read(), write()
or pthread_create()) but further on.
> $ ltrace streamer -t 0:30 -o movie.mov -f yv12 -F mono16
> pthread_cond_init(0x0806a6a8, 0, 0, 0, 0x401a3104) = 0
> malloc(960) = 0x08064e70
> malloc(1264) = 0x08065238
> pthread_mutex_init(0x08065238, 0, 0, 0, 1) = 0
> pthread_mutex_init(0x080656c0, 0, 0x400388af, 0x08065238, 16) = 0
> pthread_cond_init(0x080656d8, 0, 0x400388af, 0x08065238, 16) = 0
> pthread_create(0x08065708, 0, 0x080529d0, 0x08065238, 0x080655a4) = 0
> pthread_mutex_init(0x080653b0, 0, 0xbffff318, 0x08065238, 16) = 0
> pthread_cond_init(0x080653c8, 0, 0xbffff318, 0x08065238, 16) = 0
> pthread_create(0x080653f8, 0, 0x080527c0, 0x08065238, 0x08065294) = 0
> --- SIGSEGV (Segmentation fault) ---
> +++ killed by SIGSEGV +++
It could be a threading issue - but all we know at this point is
that the program faulted sometime _after_ creating a thread.
instead of ltrace try something like this:
gdb streamer
run -t 0:30 -o movie.mov -f yv12 -F mono16
when the program faults use either the 'where' or 'bt' (backtrace) -
they are the same command, just different names.
> Is it possible to use mencoder or ffmpeg for capturing for
> mjpegtools? I couldn't figure out how to create an input
> satifying lav2yuv/mpeg2.
Perhaps others who capture to mjpeg can help with some ideas - but
I thought 'lavrec' was the usual method used to capture mjpeg data.
I have not had success with ffmpeg and MJPEG data - on a big endian
system (PPC) a solid green screen, and on little endian system (AMD,
Intel) only one of the fields appears.
I think 'lavrec' would be your best choice - perhaps Bernhard will
have time to help you with some suggestions.
Cheers,
Steven
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