Rendering Question(creating video file)

sportswizdan · Post by **sportswizdan** » Tue Dec 13, 2005 6:19 am

Hi Everyone...

I take my final edited 'VSP' file and go to share- "create video file". I then take this file and go to share-"create disc". I then watch my newly burned DVD on the TV and fine something I didnt like. If I go back into that final VSP file and make a few more edits, then take that same file and go back to "create video file" and re-render it again...Am I losing any video quality (generation loss) because I am rendering that same file for a 2nd or 3rd time? Thanks in advance,

Dan

Post by **Ken Berry** » Tue Dec 13, 2005 6:40 am

If I am understanding you correctly, I don't think you lose any quality at all, and that is because you are not re-rendering anything, simply producing another DVD-compatible mpeg-2 to replace the first one you made at the Share > Create Video File stage.

This is because the .VSP file is not a video file. It is the project file, telling Video Studio what clips have been used, where they are stored on your computer and what you have done to them (i.e. your editing). Alright, you use this project file in Share > Create Video File and you produce AAA.mpg, which is DVD compliant. When you Share > Create Disc, you find you don't like it.

Well at that stage, you can forget about AAA.mpg, even delete it if you like. Because you are re-opening the original project (your .VSP file) and it uses all the _original_ captured clips and not AAA.mpg. You change your editing, save the .VSP, and then go Share > Create Video File again, and this time you produce a totally different mpeg-2, say BBB.mpg. They are quite distinct. AAA.mpg was rendered once to produce it and if it was DVD compliant, it would not have been re-rendered in the burn phase, just multiplexed. Ditto for BBB.mpg. In other words, no re-rendering since to produce BBB.mpg you are using your original clips and not AAA.mpg... Hope that was not too confusing!

sportswizdan · Post by **sportswizdan** » Tue Dec 13, 2005 7:43 am

Ken, Thanks alot for the quick response and great explanation! I aprreciate it. One more question to totally straighten me out. After I have my compliant DVD file from share-create disc...I can make as many copies of that completed DVD file on different days and NEVER lose anything as far as quality because that is just multiplexing...correct? I also can take that same DVD file and burn it with another program I presume. Thanks for the help!!! Dan

Post by **Ken Berry** » Tue Dec 13, 2005 10:58 am

Sorry -- we are talking about two different things, though the answer to your latest question is still yes! The Share > Create Video File process produces a DVD-compatible mpeg-2 file which has yet to be burned to disc. But in your latest post, you are talking about a "compliant DVD file from share-create disc'. In fact, in one sense, what you have from Share > Create Disc, IS a disc in all but name. It is an ISO or disc image file, which can be burned as many times as you like. And yes, it should always produce a disc with the same level of quality because it is a completed image of a burned disc. But no, it is not because it is being multiplexed each time -- the multiplexing occurs _before_ the ISO files is produced. Although it is a video file, think of it at this stage almost as though it were no more than a data file which you are merely burning to an actual disc... And you can, of course, theoretically burn the same (data) file to any number of discs with no loss of quality.

Instead of an ISO file, you can also produce a Video folder in the Share > Create Disc option. This is also the complete final structure of your DVD, multiplexing and all. It is in fact the very \XXX\Video_TS folder that is the video heart and soul of a burned DVD. And like the ISO image file, you can burn as many discs as you like from it with no loss of quality because the rendering (and multiplexing) are already done.