[FFmpeg-devel] filter queue question

[Alex]

Hi!
I developing custom GPU filter that require lot of time to process frames and as result overal fps is low ( around 20 fps):

ffmpeg -i 720p.mp4  -filter_complex "format=rgb24,myfilter" -f null -

But then I added actual encoding part to ffmpeg command, result fps is down to 16 fps (-4 fps, around 20%!!!):

ffmpeg -i 720p.mp4  -filter_complex "format=rgb24,myfilter" -c:v h264 -y out.mp4

If I look at timeline of overla process in each cycle:

|----decoding time---| ---> |------------------------------filtering time-------------------------|  ---> |---encoding time---|

So, basically can I process frame in my custom filter without waiting for encoding to finish?
In other word I want to process frames in my custom filter in parallel/queue to encoding process???