I have three sequences within one project that I am exporting into three separate files for delivery to client. The clips were recorded with a Panasonic P2 directly into FCP as DVCPRO HD 720p, 960x720 frame size, 23.98 video rate, 48.0kHz audio rate, 16 bit integer depth. I also used some mp3 music clips that are 44.1 kHz, 32 bit floating point. The sequences are same as the video clips, except the audio depth is 32 bit floating point.
I am exporting the sequences (from in to out points) using quicktime conversion. Settings are: video - h264 codec, current frame rate, best quality; audio - linear PCM, 44.1 kHz, 16 bit integer; "prepare for internet streaming, fast start" is checked.
The export settings are meant for online streaming - that's why I'm checking internet streaming and using 44.1 kHz (the latter per YouTube's recommendations).
The exports play perfectly on my computer. I burned them to a data DVD and they still play perfectly on my computer. I posted them to a file sharing server and downloaded them, and they play perfectly on my computer. However, when the client downloads them to his computer, or when he plays them from the data DVD, the audio and video are slightly out of synch.
I have asked two others to download the files. One had no synch issues, the other did. I viewed the latter with my own eyes, or I wouldn't have believed this was happening. The latter was on a Mac machine, using quicktime, so I don't think it's a platform issue. And since I viewed the flies on the DVD correctly, but the client has the synch issue with the SAME files, it's not something caused by the online server.
Macbook Pro 15" 2.5GHz Intel Core 2 Duo, Mac OS X (10.5.6), FCP 5.0.4; QT Pro 7.6
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