[FFmpeg-devel] [PATCH] avfilter/vf_deshake: replace qsort with AV_QSORT

Ganesh Ajjanagadde gajjanag at mit.edu
Sat Oct 31 20:08:36 CET 2015

On Sat, Oct 31, 2015 at 2:30 PM, Nicolas George <george at nsup.org> wrote:
> Le decadi 10 brumaire, an CCXXIV, Ganesh Ajjanagadde a écrit :
>> For the benefit of the thread, here is a benchmark for the find_motion
>> function to address this point:
>> new:
>> 1815531917 decicycles in find_motion,    1024 runs,      0 skips
>> old:
>> 1900282483 decicycles in find_motion,    1024 runs,      0 skips
> So 4-5%. That is nowhere near the values, but that is still a worthy
> speedup nonetheless. Thanks for running the test.

The gap is not surprising due to your remark regarding the loop, and
is a general caveat regarding benchmarking/profiling that I will try
to be more cautious about in the future.

For future reference, I have adopted the consistent convention of
referring to the block of code in the START, STOP macros so as to make
it clear what I have benchmarked. If it is a loop in a function, I
will be explicit and put line nos, e.g "235-260:foo" where foo is the
function name.

> Regards,
> --
>   Nicolas George
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