Can YouTube Videos's Sound Codec converted to AC3 5.1?

I think they may be m4a. Even if it's mp3, they are both 2 channel formats.

You can go from a higher bit rate to lower bit rate by losing some quality but can't go the other way. Similarly you can't create 6 channel sound from only 2 channels. Even if you did, it would not be true AC3 6 channel, with the other 4 channels simply having identical content.

I have only seen true AC3 6 channel tracks extracted from original DVDs. And possibly from Blu rays now.

Regards,
Uday
 
most of the AVR can convert your stereo channels sound to 6 channels surround sound. But it should be like original 5.1 source.
 
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