* Update verbose: upper case when start new sentences.
* Throw exception if invalid operation (instead of print something in
verbose on just return without doing nothing).
* Add comments.

* Can't demultiplexing and re-wrap a stream.

* Check if 'avProfileIdentificator' key exist in map.
* Do nothing if profile already exists.

… a stream

* Same behavior as ffmpeg: transcode with the same "profile" as input.
* Need to update 'sampleFormat' of AudioStreamProperty: use
av_get_sample_fmt_name (ffmpeg function insted of creating our specific
strings).

Because now we get string which correspond to sampleFormat from
av_get_sample_fmt_name (ffmpeg function).

* Keep in the stucture the sample format name from FFmpeg
(sampleFormatName), and the more user friendly name
(sampleFormatLongName).
* Update pyTest consequently.