Provide FFMPEG::Movie#audio_channels from ffprobe
Refactor unsupported audio codec for ffprobe
FFMPEG::MOVIE#frame_rate is now a Rational number
Updated audio for ffprobe
more cleaning
Handle rotated videos from ffprobe
Handle empty movie from ffprobe
Handle irrational FFMPEG::Movie#frame_rate
Different units kb/s to bit/s
Cannot replicate any crashes related to ISO-8859-1

Because I cannot replicate any crashes related to ISO-8859-1 charachters
in the outputs. I am removing these tests.