Odd thing happened this evening. I made a PPCC Ibook vid and exported to quicktime 7.7 and it plays fine- good audio and video. Took that .mov and upload it to Youtube and there was no mic audio. The audio from the computer screen cap came through but the mic audio was absent - very odd.Who knows why, YT is always changing and breaking things. Anyhow, I pushed it through imovie and re-saved in .m4v and it worked. First time this happened as my other .mov vids uploaded just fine. Oh well, I know how to fix it if it occurs again. Part of the challenge I suppose.
I often get such problems - with Youtube and local use after creating .mov files - essentially transcoding in MPEG Streamclip to .mp4 tends to be the only fix after Handbrake fails.