You can’t really embed any


You can’t really embed anything into an existing MPEG file if I’m understanding you correctly.

It takes special encoders to encode 5.1 sound of which all of your channels are done at the same time. You can’t add to it once you’re already done.

I know Adobe Premiere Pro has this Surecode (plug-in). I’m not sure if Pin~9 has anything or not.

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