Dual Audio

[Gyrados]

Is it possible to take audio from one file and stick it into another? For instance, use [a4e]'s SAC English audio and place it onto a higher definition version (THORA's when they release it)?

[Duki3003]

Of course it is, all mkv files can be demuxed/remuxed where you can add/remove audio/video/subtitle tracks.
So it's not impossible but you'll probably have to re-sync the audio if it allows you (perhaps the audio files are different, and can't be synced because of missing/added scenes for example)

[Xiong Chiamiov]

Remuxing is a fairly trivial operation (both in difficulty and time) using something like mkvtoolnix.

Some players will allow you to adjust the audio timing while watching a file, so that you don't have to actually resync it; I know smplayer does.

[Gyrados]

Ahhh ok... Thanks for the conformation... I got some reading to do

[Xtras]

But it doesn't work for all series and all dubs. Certain series have some frames dropped out in the english release and thus when you go to make a dual audio, the file drops out of sync. Gundam 0079 comes to mind, but I have run into that problem with some others. You might need to play around with MKVToolNix a little bit.

[defsyfe]

Yep. Like what's been said it can be really easy for some files and yet be a total pain for others. You'll need MKVextract for the demux and MKVmerge for the muxing. Pretty sure mkvextract comes with toolnix but I don't remember. MKVmerge does however.

[Duki3003]

Nope, it's downloaded separately - but it needs mkvtoolnix to work