.mpg files to DVD A rendered files.

fosko wrote on 8/30/2014, 2:59 PM
I'm given a project. It was done in DVD-A using .mpg files instead of rendering in Vegas using DVDa templates and seperate audio and video files (I'm still not sure WHY that's the standard procedure, but until I can research I'll follow the rules. I don't have the original Vegas .veg file to recreate it using the proper format.

Does it make sense and us there any advantage to taking the .mpg files and recreating them as seperate video and audio files using the appropiate DVD-A templates ?

Comments

EricLNZ wrote on 8/30/2014, 7:20 PM
Before you re-render suggest you add them to DVDA and check with File/Optimize Disk whether DVDA will accept them without recompression. If so you don't need to do anything and the original quality will be preserved.
musicvid10 wrote on 8/30/2014, 7:37 PM
No. If DVDA needs to re-encode, it will.
If it came from DVDA originally, it may not need to if your project is set right.
No need to force the issue.

One reason modern dvd authoring needs separate video and audio is so you can have selectable audio tracks (languages, narrative, karaoke, etc.). Also, a pro can replace an audio mix quickly without rendering the whole thing. Those are just two of the reasons.
PeterDuke wrote on 8/30/2014, 8:07 PM
The reason why DVDA usually requires separate audio and video files is because it is rather fussy about the coding format of each.

If you take the VOB files of a DVD created by DVDA, concatenate them to a single MPG file and author a DVD using it, DVDA will be quite happy, even though the video and audio are in the same file.

The Main Concept MPEG2 encoder in Vegas only gives you the options of MP1 and MP2 audio, neither of which are acceptable to DVDA, although I have made many DVDs in the past with MP2 audio which played happily on my equipment.

It is interesting that if you create a BD using the Sony AVC encoder, you still have to render the audio and video separately because the Sony encoder produces AC3 studio audio and DVDA requires AC3 pro. audio. I suspect that this is purely a licencing restriction. The AC3 licence is tied to DVDA, and the AC3 Pro encoder will not be installed until you install DVDA.