Forums > Jitter

jit capture frame lag during hd movie playback

May 25, 2010 | 10:03 pm

can anyone confirm that if you playback a 1920 1080 movie wile capturing using dx or qt at 740Xx480
then pan the camera the captured image jitters as I move the camara ,if i switch off the movie the capture is smooth.
the method i am usig is qt/dx >slab >texture>video-plane plus qt movie > slab > texture >video-plane qmetro on 2.
the cpu only reports 10%.
frame-rate reports 50+

System
black magic pro
i7 running at 3.2 ghz
6g ddr3 triple channel ram 1600
windows 7
raid ssd
geforce gtx 260 oc
max 5.1.3

also tried on
black magic pro
amd quad 3 ghz
4 gig ddr3
geforce 9800 gtx
xp / 7
max 5.1.3



efe
May 26, 2010 | 4:40 am

Maybe the codec you are using?


May 28, 2010 | 2:39 pm

hi efe
the codec for the movie in the player is jpeg 60% mov.
i don’t understand how this seams to affect the capture input as the cpu and frames are fine.
if i slow the bangs two the qt player i can see that each bang makes the capture hesitate.
it must be the time it takes for the movie decompression to happen or something , with this cpu i would not expect it to happen.
regards Chris


May 28, 2010 | 6:41 pm

are you using @colormode uyvy on your capture and playback objects?


May 28, 2010 | 7:58 pm

yep uyvy and unique 1


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