[FFmpeg-user] Thumbnail filter significantly increasing cpu usage

[Vasya Volkov]

Hi,

I'm using ffmpeg for real-time encoding and want to get thumbnail from
input-video stream every period of time. I've tried to use thumbnail filter
with parameter n =  50 (thumbnail=50). And on my cpu (Intel(R) Xeon(R) CPU
@ 3.47GHz stepping 02) using this filter increases average CPU usage for
5%-10% --- this is very high value I think.

Can you suggest me how can I reduce CPU usage and achieve the same goal?

My global filter looks like:
[#0x110]yadif,split=2[vidin][thumbin];[vidin]scale=1920:1080[vidout];[thumbin]thumbnail=50[thumbout]

gop size 75 and I'm using preset "fast", high profile; MP2 --> H.264

Thanks