When we want to generate a stream (black or silence), we should not have to set both output profile and ICodec. The ICodec should be guessed from the profile, which must contain enough parameters to generate the stream.
It would avoid duplicated parameters into ICodec and profile.

https://github.com/mikrosimage/avTranscoder/blob/develop/src/AvTranscoder/transcoder/Transcoder.hpp#L56
https://github.com/mikrosimage/avTranscoder/blob/develop/src/AvTranscoder/transcoder/Transcoder.hpp#L66