Changing Compression in Custom Rendering Template

abm wrote on 12/11/2002, 5:17 PM
I captured DV to my hard drive for editing in Vegas 3.0. In rendering the project I'm trying to achieve greater compression and increase the amount of video to fit on a standard DVD 4.7gb disk. Right now, I'm only getting a one-hour and 25 minute project to fit on a standard 4.7gb DVD (using "DVDit" along with its menus and some additional file headroom that it requires)using the Vegas NTSC DVD template. Anyway, does anyone know what I can do to tweak the Vegas CUSTOM template settings for rendering to MPEG-2 for burning to an NTSC DVD? I don't know where to find any detailed information on all those settings in the custom screens, such as compression rates, etc.... Again, my objective is to get perhaps as much as a 2 hour video project to fit on a 4.7gb DVD disk with menus generated through DVDit. I talked to Tech Support at Sonicfoundry, and they said that they can only recommend that I stay with the NTSC DVD template and not venture into the custom settings. Any help would be appreciated. -Bm

Comments

vonhosen wrote on 12/11/2002, 5:34 PM
The only things I'd consider changing really are:-

If you have busy footage consider on the "Advanced Video" tab setting the DC coefficient to 10bit rather than 9.

Other than that it is a trade off between how much you want to fit on the disc & quality.

The thing to change on the first tab is the "average bitrate" in the VBR encode rates. Go something along the lines of this formula to work out what to set:-

600/(total minutes of video) = average bitrate to be set for video & audio combined

i.e.
600/90mins = 6.66Mbs average bitrate for video & audio combined.

Now depending on what version of DVDit you are using, you will be able to set rates as follows for this example.

If you are using LE or SE all your audio will be output as PCM at about 1600kbs. this would leave just about 5.0Mbs as your average VBR encode rate in Vegas.

If you are using PE you can convert all your audio to AC-3 at typically 192Kbs which will mean that you could have video average bitrate set to about 6.46Mbs.

Just massge the figures using the formula above for whatever length of total video you have in the project & you should OK. You can leave the Min & Max figures for the VBR encode as they are in the template.