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Quicktime 720 50P playback Jerky.

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Adam Sondej
Quicktime 720 50P playback Jerky.
on Mar 18, 2008 at 11:21:06 pm

Hi

I Cannot get a 1280x720 50P Photo JPEG Quicktime
to playback smoothly from a Dual 2GHz powerPC on either a LCD video monitor
or Panasonic PT-D4000E projector (DVI input).

There is playback jerkiness even though
QT movie info reports movie is playing back at 50fps
and display sizes are optimized for QT movie size.

Any ideas?

Cheers

Adam


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Zane Barker
Re: Quicktime 720 50P playback Jerky.
on Mar 19, 2008 at 5:19:05 am

What is the video file playing from. CD/DVD, hard drive (is so how is it connected). A little more info please.

There are no "technical solutions" to your "artistic problems".
Don't let technology get in the way of your creativity!



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Adam Sondej
Re: Quicktime 720 50P playback Jerky.
on Mar 19, 2008 at 9:27:35 pm

Hi, here are some more details.

The 50fps photojpeg QT is playing from the internal SATA HD.
The animation is of a sphere travelling accross screen.
Activity monitor shows quicktime process is using 35% CPU.
QT Datarate is 5.6 Mbits/s

Dual 2 GHz Power PC
1.5 GB Ram
Geforce 6600LE video card
Dell 2407 monitor

Changing display frequency from 60Hz to 75Hz
alters the appearance of the playback but it is still jerky.
Playing the animation in a HD video program onto a video monitor results in smooth playback.

Cheers

Adam


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