[REQ] per scene split/encoding

[MarcoRavich]

It could be interesting to "grab" this function from Av1an by @master-of-zen:

Segmenting

--split-method          Method used for generating splits.(Default: av-scenedetect)
                        Options: `av-scenedetect`, `none`
                        `none` -  skips scenedetection.

-m  --chunk-method      Determine the method in which chunks are made for encoding.
                        By default the best method is selected automatically.
                        [possible values: segment, select, ffms2, lsmash, hybrid]

-s  --scenes            File to save/read scenes.

-x  --extra-split       Size of chunk after which it will be split [default: 240]

--min-scene-len         Specifies the minimum number of frames in each split.

Hope that inspires.