CODEWITHSUNDEEP
ffmpeglibav
Andrey Katkov
Andrey Katkov

Reputation: 3

sws_scale performance comparison to media players real time resize

While playing 4K video user can resize players window - and result image will be scaled smoothly in run time.

On the other hand - program written with libav which reads 4k video file frame by frame and scale it down with sws_scale function do it less effective: it took more time then video duration to resize it.

Why is it so? Maybe because player fps is less and some frames are skipped - but video still looks smooth?

Upvotes: 0

Views: 698

Answers (1)

Ronald S. Bultje
Ronald S. Bultje

Reputation: 11184

This is because most video players do scaling in the video card's hardware. With GL, for example, scaling (or even format conversion from YUV to RGB) is free.

Upvotes: 2

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