>> The 3.2.14 libraries are clearly twice as fast as the 4.2.2 libraries, 
>> as least with the h.265 media files I'm testing with.

>Then please run git bisect, but allow me to repeat that it may make sense to 
>reproduce with ffmpeg (which would make your bug report much, much simpler).
>
>Carl Eugen

The source of the timing differences I've been investigating is found, and the 
problem is outside ffmpeg/libav.
It was two different versions of a threading library, each configured for 
different pe3rformance goals. 


Blake Senftner
Sr. Software Scientist | CyberExtruder
1401 Valley Road, Wayne, New Jersey 07470
cel: 213 400 6424 (pacific daylight savings timezone)
bsenft...@cyberextruder.com





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