"final video still contains all effects as intended in both cases?"

Would it be possible to render a project with "traditional" Cinelerra, then again with the optimized.
Then import both rendered files into the traditional and set the top track to "subtract".
Shouldn't be it a pure black?

2019. 02. 12. 15:08 keltezéssel, Andrew Randrianasulu írta:

В сообщении от Tuesday 12 February 2019 16:25:27 Andrea paz написал(а):

I did some quick tests:
CFLAGS std --> -02  TIMEcompile= about 20 min
Playback --> unchecked "play every frame"; X11-OpenGL

Only edit --> framerate achivied = 30
edit + effects -->                            = 07

Renderig of 20 sec of mp4 video. Preset hd.youtube = 1 min 59 sec


CFLAGS new --> -03 -ffast-math  TIMEcompile= about 20 min (the same!)
Playback --> unchecked "play every frame"; X11-OpenGL

Only edit --> framerate achivied = 30
edit + effects -->                            = 13

Renderig of 20 sec of mp4 video. Preset hd.youtube = 1 min 59 sec (the
same!)

Thanks for testing! It seems decoding/encoding (via ffmpeg embedded in 
Cinelerra) already uses assembler optimizations, but effects still can be 
accelerated via this 'cheap and dirty' technique.

BUT, most importantly, is final video still contains all effects as intended in 
both cases? because there is no point in making fast but incorrect effects ...