Odd question?

medeamajic · Post by **medeamajic** » Sat Jan 06, 2007 10:56 am

If I lower the bit rate and stick the different DVDs made with DVD MF5 in my computer they show different file sizes as should be expected. The files are about the exact same size as the actual MPEG 2 files exported from my Edius video editing software. However the DVDs look like they have burned exactly the same amount of area or space on the DVD. I opt for Do Not Convert MPEG Compliant Files when using DVD MF5. What gives? Why would it burn as much surface area on the DVD if the file size is different? Even if I copy a DVD that is about 150 MB with Ulead DVD MF5 it burns the same amount of space as a 550 MB file. Why is that? The DVD seems to play OK provided my MPEG file is 7000 kbps or less. If I import MPEG 2 files that are 9000 kbps they play jerky in the DVD machines. Can any of you get 9000 kbps MPEG2 files to play in your DVD player using MF5?

Have you folks noticed this?

I have heard most DVD players can not play back data higher than 1X speed. 9000 kbps should not exceed that limit.

maddrummer3301 · Post by **maddrummer3301** » Sat Jan 06, 2007 8:48 pm

medeamajic · Post by **medeamajic** » Sat Jan 06, 2007 11:31 pm

Thanks for the information about padding. I am just getting into DVDs for my own personal use. I knew something was very odd about how much of the DVD surface was being used for such small files.

So I take it some DVDs have a bottle neck at 7000kbps. I guess it could also be the blank DVDs that will not allow a 9000 kbps files to play. How often do you get bad blank DVDS?

njdowding · Post by **njdowding** » Sat Jan 06, 2007 11:49 pm

Why would you want to run at 9800? Most DVD players will not accept this level (and it must include the sound as well). Even a total of video and sound of 9800kbps is more than pushing your luck for no appreciable gain in most cases.

If you use a much lower say 7000 varaible or 6000 fixed bit rate will in most cases still give you quality DVD. Plus you have plenty of over head for the sound.

Nick

htchien · Post by **htchien** » Mon Jan 08, 2007 10:58 am

I would suggest to set the video bitrate not to higher than 7000 kbps.

In the DVD spec, you can set the bitrate max to 9800 kbps, but it's for the combination of both video / audio bitrates. You have to leave some bitrate for audio. If you set the video bitrate higher than 7600, the video might be picky or flickering on most DVD players.

Hope this helps.

H.T.

medeamajic · Post by **medeamajic** » Mon Jan 08, 2007 3:30 pm

Thanks for the info.