[x264-devel] speeding up encode to multiple bitrate output

[Martin Belleau]

I'm looking to do multiple encodes with same settings (resolution, frame 
rate, encoding settings) but producing multiple bitrates on output, 
likely using CBR or capped CRF.

Is there currently a way to speed this up and re-use some calculations, 
using the x264 DLL?  Could I run the analysis pass once and re-use it 
for my various encodes?  And if so, could I do this in pseudo-one-pass 
encoding so this could also be used for live encoding scenarios?

Any guess as how much CPU resources/speed I could gain if I re-used 
motion compensation, frame type decision, lookahead between the various 
encodes (and if that makes much sense, and would much quality would be 
lost)?

Would such a thing be possible to implement by modifying x264?

Any other suggestions for accomplishing this goal would be welcome!