[mythtv-users] standard capture size?

[Richard Schelin]

I was just reading the v4l mailing list digest I also have, and there were 
two interesting notes about capsure resolution:

<Snip>
Many cards are slower as soon as you dont use the standard size 704x576 
and/or the preferred pixel format (usually YUV420P)
</Snip>

<Snip>
Looks like you have to use 704x576 when the signal is 4/3 and 924x576
when 16/9. But I have no idea how one detects in V4L that the channel
starts (or stops) transmitting in 16/9.
</Snip>


So this brings a few things to mind, why is the highest resolution that 
MythTv supports 720x480 (As I remember these were the numbers)  Shouldn't it 
be something over 704x576?

I seem to remember reading about television broadcast (not my field of 
expertise), and remember something about them broadcasting more lines than 
can be diplayed.  So is the actual television display 480 with an extra 96 
lines of "extra" information?

Would I gain in performance by recording as close to the native format as 
possible...704x480?  I realize that the amount of cpu time used to scale the 
image is much more than the mpeg4 encoding, but any increase in performance 
for "free" is nice....

Anyone have any thoughts?

Rich





----Original Message Follows----
From: mythtv-users-request at snowman.net
Reply-To: mythtv-users at snowman.net
To: mythtv-users at snowman.net
Subject: mythtv-users Digest, Vol 6, Issue 40
Date: Thu, 10 Jul 2003 12:00:14 -0400

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