[Libav-user] swscale speed

[Jan Pohanka]

Hello,

what is the fastest settings for swscale? I'd like to use it on a small  
embedded system (armv5) to downsample (decimate) or just to convert pixel  
formats.

I have not checked the internals but it seems that swscale always do a lot  
of processing because even if it does just pixel format conversion (no  
scaling) for example from YUV420 to NV12 it takes really long.

In the case of scaling I have also not found a big difference while using  
different interpolations (eg. SWS_BICUBIC vs SWS_POINT) and I think that  
nearest neighbour should be significantly faster. Is there any  
optimalization if only decimating (scaling with factor of 2^n) is  
performed?

with best regards
Jan

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