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I can't remember the thread where someone was having audio sync problems with long video streams (>15 minutes). I ran an experiment with a 21+ minute movie and found that QT Pro 7.04 encoding in H.264 will have a noticeable sync problem toward the middle of the stream - getting progressively worse until the end. Encoding with Sorenson Squeeze 4.3 MPEG4 produces slightly better video and maintains the proper audio sync throughout the stream. The only conclusion I can come up with is that Apple's compression codec is "not right" when it comes to audio syncing. Both tools used the same .mov file and I matched frame sizes. Examples: Modem rtsp://streamer.mt.gov/Vol2/SPEDChildCount/Exiting2006_56K.mp4 Sorenson rtsp://streamer.mt.gov/Vol2/SPEDChildCount/Exiting2006_56K_OLD.mp4 QTPro 7.04 256K DSL rtsp://streamer.mt.gov/Vol2/SPEDChildCount/Exiting2006_256K.mp4 Sorenson rtsp://streamer.mt.gov/Vol2/SPEDChildCount/Exiting2006_256K_OLD.mp4 QTPro 1 Mbps Cable/DSL rtsp://streamer.mt.gov/Vol2/SPEDChildCount/Exiting2006_1Mbps.mp4 Sorenson rtsp://streamer.mt.gov/Vol2/SPEDChildCount/Exiting2006_1Mbps_OLD.mp4 QTPro ------------------------------------------------- Steve Meredith, cca, cta Internet Services Bureau MT Office of Public Instruction 406-444-3563 email@hidden There's no place like 127.0.0.1 There's no place like 127.0.0.1 ... _______________________________________________ Do not post admin requests to the list. They will be ignored. QuickTime-Users mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/quicktime-users/email@hidden This email sent to email@hidden
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