[FFmpeg-user] ~50% performance difference overlaying static image with png series using -vf/-filter_complex

d-fens d-fens at 00010111.de
Fri Aug 23 00:21:09 CEST 2013


i have a background png and a sequence of pngs with transparency which  
should overlay the background.

when i use

./ffmpeg -i %04d.png -vf "movie=bg.png [bg]; [in] format=rgb32, split  
[T1], fifo, [bg] overlay=0:0, [T2] overlay=0:0 [out]; [T1] fifo [T2]"  

(taken from  
i get arround 13fps for fullHD images, but using

./ffmpeg -loop 1 -i bg.png -i %04d.png -filter_complex  
overlay=shortest=1 out.mp4

i get around 7fps for the same images.
I guess the background image gets re-read here but thats just a guess;  
as the second, newer version looks much more clean and simple i wonder  
whats the way to get best performance in this scenario?


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