[FFmpeg-user] Question about tmix filter

Michael Koch astroelectronic at t-online.de
Wed Mar 6 16:53:29 EET 2019

I'd like to know which frames does the tmix filter use for averaging. 
Let's assume tmix=frames=9.
To make the n_th frame of the output video, does it use input frames n-8 
to n, or n-4 to n+4, or n to n+8?
How does the filter behave at the beginning and end of the video, where 
not all required input frames exist?


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