I was transcoding an AVCHD volume via AMA Link when this showed up:
Assertion failed: audioDesc && (0 < audioDesc->GetNumChannels())
Clicking [Exit Application] eventually displayed an OSX app crash dialog. You know, the one with the exceptions and hex dumps.
Happened a couple times on the same clip. The same 27-minute clip.
That's when it dawned on me: this might be a spanned clip. Doing a Reveal File (right-click on a clip -> Reveal File) showed two clips highlighted in Finder. Checked my bin. There's 0003, there's 0005, but where's 0004? Back to Finder. 0003's a ilttle over 4GB, 0004's 230-some MB. Yep, this is definitely a spanned clip.
Looked up spanned clips in Help. It says they're supported, but how?
1) Grab tsMuxeR for Mac OSX (Snow Leopard). Works in 10.8.4.
2) Get rid of the Korean fonts per the README. (I copied them to my Desktop to a folder, just in case.)
3) Under Input, "add" the largest clip first, then "join" subsequent ones. (You'll see these buttons in tsMuxeR.)
4) Select "M2TS Muxing" under Output.
5) Import the M2TS directly into MC.
I imported mine with DNxHD 100, compared it to the source footage, looks good.
So next time you get this, check for long clips. Chances are they're spanned clips. Skip transcoding those for the first round, merge them into new M2TS's, import directly, and go.
I had the same exact error. Happens on any clip longer than about 4 mins. My workaround was to use XDCam transfer "import" tool to join the long clips into one file before importing into avid. Worked fine after doing that extra step.
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