As a follow up.....
I let these videos transcode overnight in to both XDCAMHD50 & also H264 in media encoder CS5.5.
I first replaced the AVCHD & Canon XF footage with the XDCAMHD50 footage and let it conform the audio (this is still a pain!). Playback was now perfect.
I repeated the exercise with the H264 (.mp4 @ 32mbit) and again, no problems with playback of multiple layers and / or multicam.
Just to be sure, I changed the files back to the original spanned clips and the original problem returned (no surprise - but was worth checking).
So, at this point the conclusion has to be that the spanned clips are the cause of the problem....... but I'm happy to look at any other causes Adobe engineers consider worthwhile.
I am not understanding what it means when you say "AVCHD and Canon XLF files are joined on import..." ("chained clips")
What is this workflow?
I guess I dont understand the term "chained" in context of any workflow that I know of.
BTW - I understand spanned clips.
Chanied, Spanned, Joined, Merged..... think of these are synonyms in this context.
There are multiple files seen as one. That "one file" is not playing properly, but if I transcode the multiple files in to a single file then it does.
So...... 'spanned' files are broken. Does that work for you ?
I filed the bug report there about 3 or 4 hours ago with a link to download a sample project. No one has downloaded it yet
Don't expect instantaneous response on a Friday afternoon from an engineering team that just shipped the biggest release of their software ever.
I don't I've been a software engineer myself in the past. Big releases are, well, big You're drained by the effort to release, and then all these pesky people find bugs and want them fixed now. Relax. Have a good weekend. We're out shooting. Come monday we'll need to be editing so .... err... 9am monday morning is another matter