[Cin] bitstream filtering - does not crash but also not completely work?

[Andrew Randrianasulu]

I tried to fix our internal bitstream filtering on muxing using this code

https://github.com/FFmpeg/FFmpeg/blob/master/libavformat/tee.c

it works in sense it stopped crashing and adding simple filter like
dump_extra makes file a bit bigger.

But complex stuff like cropping or rotation still does not work  :-(

not sure, may be we need to add those options via av_dict_set too ?
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