MPEG2 rendering DVDA v Vegas

Ben Longden wrote on 9/27/2009, 1:07 AM
Just a question for the techies...

I have noticed that if I render an.avi file into MPEG2 using Vegas, then get DVD Architect to burn to disc, the result is NOT as crisp as having DVDA deal with the .avi file in the first place.

In other words having the flow being;
.avi -> MPEG2 in Vegas -> DVDA -> disc = OK
.avi->MPEG2 in DVDA-> disc = better than OK

This includes permutations in the Vegas rendering such as two pass, VBR. DVDA states it is NOT recompressing the incoming MPEG file.

Any ideas why the process gives a better result?

Ben

Comments

farss wrote on 9/27/2009, 2:24 AM
"This includes permutations in the Vegas rendering such as two pass, VBR. DVDA states it is NOT recompressing the incoming MPEG file"

You didn't mention bitrate(s).
There's also a Quality Slider in the mpeg-2 encoder setting in Vegas, I've found some of the presets have it set to 50%.
Aside from that I've not noticed that DVDA produces sharper results.

Bob.
Ben Longden wrote on 9/29/2009, 6:03 AM
Hi Bob,
The Vegas MPEG2 rendering bitrate is set to 8Mbps max, 7Mbps average and 6Mbps minimum, and video quality 'slider' to 100%.

DVDA gives NO options.. that I can see... maybe I need to clean my specs...

Ben
farss wrote on 9/29/2009, 6:36 AM
"DVDA gives NO options.. that I can see... maybe I need to clean my specs..."

Under File>Optimize Project you'll find the Default Bitrate slider. This setting applies to anything that has to be encoded e.g. menus or anything that's not compliant. The problem most of us have with using DVDA to do the encoding is it's only CBR and all at that one bitrate.

If your video does fit at that value then you could change your encode out of Vegas to the same bitrate CBR and you should get exactly the same result.

Bob.