[opendtv] Re: Frames Per Second of 720P
- From: Ron Economos <w6rz@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 18 Jul 2008 00:12:00 -0700
720p59.94 is definitely 60 unique frames per 1.001 seconds.
Easily confirmed by capturing some 720p sports and
single-stepping through the frames.
The only 720p "frame pairing" I've seen is for EIA-608
legacy closed captions in the picture user data. One
frame carries the legacy EIA-608 data for field 1
and the next frame carries the legacy EIA-608
data for field 2.
Ron
dan.grimes@xxxxxxxx wrote:
I just attended a demonstration of a Sony MVS8000 production
switcher. The switcher can output 720 at 59.94 P and 1080 at 29.97 I.
As I we discussed frame stores, I asked if it took 60 frames to store
a one second motion clip (120 with a key) and they said no, only 30.
They (multiple Sony reps) were telling me all video is 30 frames per
second, no matter what the format.
So I am confused. I thought 720 at 59.94P meant (nearly) 60 unique
and complete 1280 by 720 pixel pictures in one second. Or does two
complete, progressive video pictures represent one frame in this
format? If so, is one 1280x720 progressive picture really a "field",
requiring two to be a frame?
Perhaps I misunderstood them (or we were misunderstanding each other)
so I would like to see you guys would be willing to set it straight
for me. Any of you using the MVS8000?
Dan
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