Yesterday I decided that it would be a good idea to update the videos on my site. Not the content (I don’t have that much free time!) but wanted to use H.264 in Flash except once I changed the files nothing played until it was done downloading!

Well that was just not acceptable– That is so 2002. As it turns out there is something called a “moov atom” more or less header info or metadata which needs to be at the beginning of the file. Certain applications tack it to the end of the file, so far this includes Squeeze, AE and Premiere.

 Scott Morgan a Flash/Flex Developer goes into more detail on his site. 

The quick answer is try saving your files out through QT or using a M4v as opposed to a .Mov…

The answer I chose, GO BACK TO On2VP6 until Adobe gets its act together. It’s not worth it to me to force my users to update to version 9 for a semi-functional H.264 inclusion. Until then you can view my reel as a .flv- yet at least it plays.