I rendered some .mov files out of SpeedEdit and although they play fine using VLC on Windoes XP they don't in QuickTime on OSX.

In Quick Time the audio plays correctly but the video appears to play about half speed.

Codec for the .mov files was MP4, 7000 kbps. Audio was 48kHz uncompressed. 1920x1080, 29.97 progressive...

What am I doing wrong here, or is there an update needed for QT?