support fmp4 cmfa hls

[fastfading]

I saw you implement record plugin with mp4ff fmp4
can this plugin support it too
mp4ff example/segemnt has an example for that .
it is also fmp4 cmfa format

[langhuihui]

It will be done

[fastfading]

it is best to be implement as multi-track mode fmp4 , the audio video mux together.