H264 + FF_THREAD_SLICE + w32thread crashes

[ronag]

Running w32thread with H264 and FF_THREAD_SLICE caused access violation inside "thread_func" at line 60:

ret= c->func(c->avctx, (uint8_t *)c->arg + jobnr*c->argsize);

None of the arguments seem to be null, so the access violation probably occurs inside the called function.

This problem does not occur with mpeg2 in same setup.

[cehoyos]

Can you reproduce the problem with ffmpeg (the application)?

In any case, please provide a backtrace.

[ronag]

I don't know how to run sliced threads instead of frame threads with ffmpeg (the application). I assume I would also need an -enable-w32thread build?

Also I cannot provide any meaningful backtrace as I'm on windows and cannot build ffmpeg. I compiled the w32thread.c class in my windows project and called ff_thread_init, before the usual avcodec_open.

The FF_SLICE_THREAD option only seems to call the "execute" function at all if I encode the file with the options, -slices 8 -tune fastdecode, if I don't provide -tune fastdecode then it won't call the execute function at all.

[cehoyos]

It is possible to get a useful backtrace on Win32 with gdb, please try that.