[Cin] Some ideas how to speed up cingg

[Andrew Randrianasulu]

Well, I only tested 1)


1)
add

fast
lowres=3
skiploopfilter=all

to your decode.opts file

lowres really only work for dv/mpe2/mjpeg. 3 is really aggressive, try 1 or
2 if it works at all.

2) Set scaling method to simplest, nearest. Obviously only work if you do
not do scaling, or plan to redo it anyway at higher quality.

3) Look if replacing -Ofast with " -mach=yourcpu, -mtune=yourcpu" works
better (grep Makefiles to see where it set)

4) Add same march/mtune cflags to individual plugins Makefiles and see if
it really speed ups them.

5) Hard - look into openmp parallel/simd directives and see if they apply
to any for loops in slow plugins.


6) As I said - proxies ... It seems that in worst case scenario (g=250
frames, fps=25) for fast (less than 1 second) seeking to any point in
stream you need nearly 10x more power that was needed  for mere playback!
It goes better for smaller g and bigger fps, but still. H265/4/2 was not
designed as editing format, and you only can brute force your way so far
....

7) Look if mesa3d tracker has any issue with vaapi decoding crashing cingg.
I added one case but it probably was just incomplete implementation in
nouveau. I avoided some crashes by disabling those filmstrip icons as fast
as I can after loading media. ymmv. I suspect way cingg drives ffmpeg and
ffmpeg in turn drives vaapi driver is quite different from usual
player/streaming case, but you probably need some thread debugging flags
added everywhere  and knowledge about how to interpret their output.
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