Renamed CHROMA_SUBSAMPLING to CHROMA_SUB_SAMPLING.
Added audio bit depth dictionary from FFMPEG.
Changed getAudioBitDepth to include more bit depths based on the audio bit depth dictionary.
Added dictionary of audio codecs.
Removed test method.
Made all methods related to video raise a FormatException exception if the format is an only an audio format.
Rearranged methods based on the category of their function.