sports mpeg capture

[manthing]

all, i'm tinkering around with image sizes & bitrates when capturing sports events. i would like to know what the other members here use as their setting for capturing sports. 720x576, 640x480? 4Mbs, 6Mbs bitrates? higher? lower?

also, what is a good compromise between screen capture size & bitrates and getting say 3 hours of stuff onto a +5 dvd?

specifically i'm using a 9800 AIW card and feeding digital signals via the s-vhs & composite audio. i don't really want to capture in AVI format as i simply want to cut to dvd straight from mpeg.

cheers in advance...

[lordsmurf]

352x480 3.5 Mb/s

Read www.digitalFAQ.com and see the ATI guides.

[jimmalenko]

3.5 Mb/s is gonna be too big for 3 hours on a DVD5

I'd go 352 x 480/576 and 2-Pass VBR (min 1000, ave 3100 max 5000) with 192kbps audio.

[lordsmurf]

Not VBR, it's not. 3.5 avg, 2.0 min, 4.0 max ... good to go.

[manthing]

LS & jimmy,

352x480 3.5 Mbs

3.5 * 1024 * 1024 / 8 * 60 * 60 * 3
= 4,954,521,600 = 4,725 GB

this does not include audio!

so i guess i will have to "shrink".

will give this a go guys. ta.

[jimmalenko]

Not VBR, it's not.

Q: What's the difference (theoretically) in filesize between 3.5 avg in VBR or 3.5 CBR ?

A:




(Note the empty space symbolising nothing)

C'mon LS, even you should know that





That's just video (no audio) @ 3500kbps. 2 hrs, 54 min 14 sec is all that will fit.







I allowed for 192kbp audio, and I normally subtract roughly 100kbps to allow for the simplest of simple menus, and to give the encoder some "room to move".

[Nelson37]

720x480 at an average of 3.75 and a max of 4.25, with audio set to 128.

With commercials cut out, this will put an NFL football game on a single DVD.

12 of 14 games fit with these settings, one of those which did not was an overtime game. Other was a game which took place in a snowstorm. Both were Shrinked to fit.

Input was S-video from satellite feed.

Calculations for ATI bitrate settings are simply not relevant. I do not know how the software encodes, but the bitrate you set is most definitely NOT the bitrate you get, and this will vary. Simply record 4 or 5, 90 minute tests with several different source types, but all of the same quality. With identical settings, filesize will vary considerably.

352x480 will allow for lower bitrate, at the cost of reduced picture quality.

Capping NFL games was why I started this adventure 5 years ago. Watching the line of scrimmage after the snap was, and still is, my main test for quality. Goes from no motion to massive motion very quickly.
Watch the lineman's legs.

Go Browns!

[manthing]

Nelson37, will try this as well. as you said, get a bigger image size as well as good bitrate, then shrink to fit.

if worse comes to worse, i will record say 2 hours worth on each dvd5 and the rest on another.

ta one and all.

[non-linear]

You really shouldn't use Full D1 (720x480) on anything with a bitrate lower than 4000Kbps. If you do, you'll definitelly see a lot of macroblocks. For me, if there's anything that will be encoded lower than 4000Kbps, I bump the resolution down to 352x480.