How do I combine an .m2v file and an .ac3 file into a .mov file ??

Hello,
I had a question regarding Demuxing M2V and AC3 files so that they can be combined into a .mov file.
A few years ago I converted a .mov file into an .m2v and an .AC3 using Final Cut Pro. I lost the FCP Project and .mov files and only have the .m2v and .ac3 files left. When I tried to combine them together in FCP, the audio did not match up anymore even though it matches on DVD Studio Pro. I was told that I needed demux the files. How do you do that ???
Thanks so much for your time !!!
Happy New Year!
Doug Lantz

A few years ago I converted a .mov file into an .m2v and an .AC3 using Final Cut Pro. I lost the FCP Project and .mov files and only have the .m2v and .ac3 files left. When I tried to combine them together in FCP, the audio did not match up anymore even though it matches on DVD Studio Pro. I was told that I needed demux the files. How do you do that ???
Doug,
Am posting the workflow discussed in my last email here in the event others might be interested.
Best workflow I've found to resync and convert the M2V/AC3 elementary stream files to an MOV ProRes422/AIFF file are as follows:
1) Convert the AC3 audio file to AIFF. (My system is configured for AC3 so I used QT 7 Pro here. My only compaint at this point is that my original AC3 file was DD5.1 and my QT 7 Pro component only supports stereo conversions.)
2) Simultaneously drop-import the original M2V file along with the converted AIFF file to MPEG Streamclip (requires the QT MPEG-2 Playback component be installed).
3) Sample playback of the combined data to ensure audio and video are correctly in sync throughout the file.
4) Use the MPEG Streamclip "Export to QuickTime" File menu option to export the current date to the target Apple ProRes422 video target you want and pass the AIFF PCM audio through to the MOV file container without further processing.
5) Import the ProRes422/AIFF MOV file to your FCP bin and reset project default codec use to match imported file when asked so you don't have to do any re-rendering for final output.
6) I re-checked file playback in the Preview window to ensure A/V was still in sync before beginning edits in the project timeline.
All went well for me using this workflow. You may want to give it a try and let us know if it worked as well for you.
Good luck!

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