In profiling the use of DVCPRO HD 720 material from the FCP HD sample
DVD, I see a function called vec_scale_horizontal_3to4_yuvs taking as
much or more time than the actual decode. I'm using
QTNewGWorldFromPtr() and setting the dimensions to 1280x720 (what the
mov reports) and using either 2vuy or yuvs for the pixel format. All
of the screen display is handled by OpenGL texturing.
QTPlayer.app does not call this function while decompressing the same
clip, and I do not recall ever seeing it in my code under QT 6.5.
The performance disparity is at least 2:1 and the function apparently
does nothing since the scale is 1:1. What are the triggers for this
function?
I am using QT 7.0.3. 10.4.2 and the original dual 2Ghz G5.
Thanks
Chris
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