gpac add ffsws:osize transcoding

[mdsohelmia]

Is your feature request related to a problem? Please describe.
We have already added different bitrate multiple profile encoding but we need to add ffsws:osize

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[mauricioabreu]

Thank you for opening the issue @mdsohelmia

Yes, you are right! I'm still fixing some missing features I left behind.

[mauricioabreu]

@mdsohelmia do you want to work on it?

[mdsohelmia]

@mauricioabreu Yes I want to contribute

[mauricioabreu]

Hello @mdsohelmia are you going to work on it?

[mdsohelmia]

@mauricioabreu Yes, I am working and almost done.