Brendan Hoar wrote:
On Tue, 20 Sep 2005, Chris Kennedy wrote:
Rolf Kistler wrote:
Hi all,
We have used ivtv and two PVR-350 to successfully to stream mpeg-2
Video/Audio data over the network using on one side the analog composite
input (camera) and on the other side the analog composite output (TV
screen). As long as one wants to transport surveillance data or a movie,
this solution just works fine.
Now the problem is that if the task is to control a camera or talk to
someone on the other end, the 2-3 seconds delay in our system is too much.
This is from it being compressed video, encoding always will introduce a
delay, in every encoding system out there. So that is with MPEG2, if
you use all YUV raw video (which should work), then there will be pretty
much no delay, although it takes 1 gig a minute of data traffic for YUV
or so. So I suspect if compressing the video to transport it you pretty
much will always have a delay? Is there anything out there you've seen
that can do this, I'd be interested if so :), but I think it's not
possible with any compression.
Is the scaler available to be applied to the raw YUV video? If so, what
kind of latency is seen on scaling w/o compression?
It should be able to scale the raw YUV, I've never done this myself, but
it has the capability in hardware and I coded all the yuv calculations
to hopefully adjust to whatever height/width is setup, never needed it
though myself so never tested that.
Thanks,
Chris
Depending on application, that could help with the raw YUV video data
rate issue.
-brendan
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Chris Kennedy
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