Fix parsing of output with -psnr on and add 640k audio bitrate #287
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-psnr causes output of PSNR=Y:nan U:nan V:nan *:nan which breaks the current parser. Treat the = split differently.
Also 640k is a very standard and well supported audio bitrate. It is the max for AC3 and is a required bitrate for bluray. Add it and simplify the channels not specified case (the old list was the same increment as channels=2).