Canon HFS200 Audio Drops Out After Compression...

What are your sequence settings?
What does FC says the audio settings are for the Canon clips are?

It could be a sent to issue.

I personally do not use send to Compresor as I have gotten varied results.

I export a quicktime(reference or self-contained) and then bring that into Compressor and render(A reference file is like a band-aid. I never use it more than once maybe twice).

You can then check the playback before Compressor and confirm audio and video in QT.

I would also confirm that the exported files from Compressor have AAC(128kbps) audio.

Open file in QT(command+I) to see the specs.
Confirm the exported file meets these specs:

http://support.google.com/youtube/bin/answer.py?hl=en&answer=1297408

What you describe sounds exactly like what happens when a mono source is recorded out of phase on a stereo pair.

In FCP, remove or mute one of the two channels of sound from the camera on the timeline. You will probably need to adjust the level of the remaining channel to compensate.

Now do your export and see if the result is the same.

MtD

If you are willing, try this:

Make a copy of your sequence by clicking on the sequence icon in the browser, and once selected, control-click on it and from the drop down menu choose Duplicate.

Name this copy something unique, then, working on the copy you just made:

Select all the clips on the timeline, and once selected go to the menu Modify > Link.

Next, while the clips are all still selected, go back to the same menu and choose Modify > Stereo Pair. This will unlink the audio from the video, and remove the stereo pair linking, so that you can remove the extraneous channel.

Now select all the clips on the second audio channel only, and once selected, delete them.

Now you should have only one audio source for the camera mic, adjust gain and pan to your liking and try the export again.

MtD

Message was edited by: Meg The Dog to fix typo

After doing the above, you double click on the remaining audio clip on the timeline so that it loads to the viewer, on on the audio tab in the viewer, adjust your pan and hear now change when you play the clip on the timeline?

Try trashing your preferences.

https://discussions.apple.com/docs/DOC-2491

MtD

How are you monitoring the sound on your computer?

MtD

Sorry, I cannot replicate your problem so I don't have a solution. My only other suggestion would be:

Create a new project, and in that project a new sequence and see if the behavior follows into the new project and sequence - if not, it would indicate your original project or sequence is corrupt.

If it works in the new project/sequence, then copy your clips from your old sequence into the new.

But my suspicion is that the problem is something obvious, that is somehow being overlooked.

MtD

Thanks for this workaround. Had a similar issue where audio captured from a camera wouldn't export via quicktime or aiff . This fixed helped me hit a deadline.

I also discovered another trick (once "Dual-Mono" is switched to "Stereo") is to unlock the stereo pair in the timeline, delete the bottom track (Right channel/A2), copy the top track (Left/A1) and paste underneath. Double click on the bottom track and slide the "Pan" to 1. You effectively have stereo from two mono tracks, which sounds as it should online:o)