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Old April 4th, 2006, 11:30 AM   #1
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Audio ok, Video runs at 50% speed

Howdy...

I have 2 computers, running Vegas and Cineform Connect HD.

I often use WMP or Media Player classic to view clips converted with Cineform so I can quickly log them without going into Vegas and having to create audio peaks and such...

Here's my issue: On 1 PC, the cineform HD clips play back just fine in WMP and in Media Player classic (and in Vegas, of course) but on the other PC, while Vegas works fine, when I play the clips in either media player, the audio is perfect, but the video runs at 50% speed slow motion. Of course, the video is instantly out of sync with the audio, and is unwatchable.

I have tried reinstalling, etc... Anyone else have this issue or know of a solution?

Thanks,

Ben
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Old April 5th, 2006, 05:26 PM   #2
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Some info on your system would be helpful. Either your memory, disk, or CPU just can't handle the throughput that HDV requires. You could try defragmenting your hard disk.
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Old April 6th, 2006, 11:12 AM   #3
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Both systems are identical from a hardware POV. AMD 4400+X2. 2GB RAM, HDs defrag'd every week. Do you think a fragmented hard drive could create a perfect 50% constant speed reduction?

I think it's got to be something to do with a codec conflict, or something..

Best,

Ben
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Old April 15th, 2006, 07:24 AM   #4
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Yes I have the same problem. Rendered Cineform file video plays at around 50% of normal speed while audio plays at normal speed when viewing in Windows Media Player. File plays OK if imported to Premiere Pro timeline in a Cineform project preset
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Old April 15th, 2006, 11:03 AM   #5
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I doubt there is a exactly 50% playback speed. Many single core systems will struggle with 1080i playback in mediaplayer. For fast mediaplayer support download http://www.cineform.com/downloads/PlaybackControls.zip, unzip and double click on AcceleratedPlay.reg which will set a register key that the decoder uses for performance playback.
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Old April 15th, 2006, 11:27 AM   #6
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I agree, it's probably not 50%. In fact, if you scrub up and down the clip the degree of audio lag varies. However the slowmo effect looks smooth - almost as if it was intended.

Thanks for the link. I've followed your instructions and now playing a cineform .avi in WMP works a treat - even while my CPU is busy encoding for DVD!. A slightly reduced raster but it's no problem. My main concern was whether the cineform file was rendered incorrectly due to settings or something.
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