TMPEnc simple question of quality preservation

[pcexpress-guy]

If I used TMPGEnc DVD Author ( TDA ) author program and bring in video using the "ADD DVD video" function, will this PRESERVE (i.e. not decode/encode) any of the video? or should I use the method of demux the VOB's then bringing use the "ADD VIDEO" function whereas you can select both video & audio?

I was reading TMPGEnc website and I found this FAQ post. at...

https://secure.pegasys-inc.com/faq/view.php?lang=en&faqid=188

It reads:

Category TMPGEnc DVD Author ( TDA ) Language en
Last update 2003-11-25 (Tue) 18:50:55
Title Can TMPGEnc DVD Author re-encode video and audio?
Text TMPGEnc DVD Author does not re-encode video.
The reason is TMPGEnc DVD Author has been designed with the preservation of the source file image quality in mind, and therefore do not re-encode nor compress the video.
Audio is re-encoded when the multi-language mode is used with audio source of different format such as linear PCM and MPEG-1 Audio Layer 2. Because of license terms, Dolby AC-3 Digital Audio can net be re-encoded into another format or converted into multi-language.
*******************

So should I just believe this statement? Does everyone agree (or mostly agree) that either method of bringing in the video will PRESERVE the video without encoding/decoding? (i.e. the video will be the same)

Not a trick question, I am a little new to this topic. What say ya?

THANKS MUCH!!

[dafreak]

tmpgenc dvd author is an authoring program, not an encoding program. If you ask tda to encode your files, it won't do it.
tmpgenc plus does the encoding.

I use tda all the time and have never had any problems with it trying to recode my video clips.

[pcexpress-guy]

that's makes sense... one strange thing, is that I had this DVD. I added several chapters. I deleted which can NOT amount to more then 20-40 seconds of video... and for some reason the file sizes are about 25% less then the non-chapter video.

Perhaps TDA does something to the audio streams?

Really... I only deleted about 20-40 seconds and now the files sizes makes me wonder what happened. In fairness, I do NOT see any quality lose in the video... and the audio seems the same. (but I am not certain about the audio)

anyway... any explanation to this would make me

THANKS!!