Just Information

videoguy wrote on 4/14/2004, 11:46 PM
I am trying to fully understand the differed MPEG2 rendering options:
I understand all except the following: DVD NTSC Video Stream, DVD Architect NTSC Video Stream, DVD Architect 24p NTSC Video.

Can someone please give me a quick explaination on each and when I would use each template. I normally use DVD NTSC. If this is too much can someone point me to a web page that might give me the informaion that I am looking for. Thanks as always in advance for all your help.

Comments

RBartlett wrote on 4/15/2004, 12:00 AM
DVD NTSC Video stream is for video not going to DVD-Architect 1.0. Perhaps the owner of Vegas has Ulead DWS2, Encore, ReelDVD or DVDLab/DvdLabPro.
The key word is elementary stream. Exporting timeline markers makes the least sense in this type of export render.


DVD Architect NTSC video stream creates a video-only .mpg program stream (compares well to the system stream definition also). If you intend to use DVDA, this is probably your best and officially, you only choice for 59.94i.

DVD Architect 24p NTSC should only be used if your timeline source is from a 24p camera or an animation/rotoscope/composite/montage with a frame cadence of 24 frames per sec. If you use this mode to save DVD space, then you are probably missing the point of this feature and how MPEG-2 compression works anyway. The ultimate player of your shiny disc will add a pulldown to this 24p if it is going out to an NTSC TV/monitor. This also creates a program/system stream, .mpg

Some folks use a free download export script that makes the audio and video with one filename selection.
videoguy wrote on 4/15/2004, 12:27 AM
Thanks for your great informaion but one thing that puzzles me is, what is the benfit of exporting a clip to elementary stream. I know that dvda does not support elementart streams. Is it just so that you can render the video one way and the audio another way. If I took two clips and one was rendered the normal way and the other was rendered using elementary stream, would I notice a difference in the quality of the file. If I am way off track on this, then let me know. I think that I have a pretty good understaning so far with the informaion that you have provided.
RBartlett wrote on 4/15/2004, 11:21 PM
Assuming that you always use one of the DVD profiles to actually make a DVD, the choice is purely based on what comes next in your workflow. Always choose "For Architect" profiles with Vegas4 and DVDA1.

I think the only template Sony have missed is the 25p PAL. I don't lose too much sleep over that but many a disc is desired in that format. Despite what the DVD-Forum said of old.

3rd party tools, and there are a glut of them, want elementary streams. DVDA states the use of program streams for the purposes of timing calculations. There apparently is no means to explicitly signify the timing on an elementary stream, despite the strong implicit timing from having closed GOP for DVD profiles. I guess it takes more processing than Sony wanted when they set out to design their Architect app. Counting frames isn't fun when trying to seek swiftly.

To muddy the waters, DVDA 2 is listed as supporting elementary streams. However out of choice I'd stick with program streams in the main even if I do buy it.

The Vegas render bitrates are regarding the video stream, whether elementary or program. You should see the same quality for the same bitrate. Which is more valid if you modify the original template to fit/max your DVD etc.
PAW wrote on 4/16/2004, 3:45 AM

Am I right in saying that if the DVD app uses elementary streams it can't sync the audio with video accuratley for previews?

Paul