Hi.
I measured the performance of picture format conversion (no scaling)
on my P2.4GHz and got the following results:
Dest. pixel format - YUV420P
img_convert():
YUV422P - 4.5 sec ~ 2200 fps
YUVJ420P - 6.5 sec ~ 1500 fps
YUVJ422P - 10 sec ~ 1000 fps
YUYV422 - 4.3 sec ~ 2300 fps
swscale() do not optimize (lgpl)
YUV422P - 96 sec ~ 104 fps
YUVJ420P - 53 sec ~ 188 fps
YUVJ422P - 110 sec ~ 90 fps
YUYV422 - 7.3 sec ~ 1360 fps
swscale() --enable-gpl
YUV422P - 30 sec ~ 330 fps
YUVJ420P - 26 sec ~ 380 fps
YUVJ422P - 42 sec ~ 230 fps
YUYV422 - 1.82 s ~ 5500 fps
Conclusions: JPEG's colorspace YUVJ42{0,2}P -> YUV420P and YUYV422 -> YUV420P
format conversion by sws_scale() even with the MMX/SSE optimization - is very
very slow
instead old removed img_convert() function.
Is it time to regain img_convert() (without scaler) function in the code?
--
Andrey Nikitin
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