DVD-R to MPEG2 Question

[xxBladExx]

Yesterday I convert my avi (harry potter 2) to DVD. And I also made Menu's with chapters. When I was done with that, I've deleted my MPEG2 file.

My question:

Is it possible for me to get the MPEG2 file out of the DVD-r without re-encoding? I really don't like the menu I made. I want to make new one.

thx

[likwid8]

well seems like your mis-intreperting the concept of the formats...

There is no way you can make a DVD out of mpeg-2, I mean sure u need to convert the mpeg-2 to complaint format to burn as DVD, but i think you might have burned it as a SVCD, im pretty sure, anyways, yes its very simple, one way I choose to do it is you get CDRWIN and u make a bin/cue out of the svcd cd, then use vcdgear to extract it to mpeg, hope i helped....

[xxBladExx]

No I'm sure that I converted it to DVD. Becaus i've already burned it, and wachted it to.

But what i've really want is: Is it possible (just like SVCD) to extract the DVD-R to MPEG?

[likwid8]

well if you burned it as a DVD then it has the rules as any other DVD has, extract the VOB files with smart ripper and then rip with dvd2avi and then encode to mpeg.....best way.... or else it defeats the purpose

[xxBladExx]

Thanks LIKWID8. It allready took me a lot of time to encoding it. I think, I leave just like it is.

Thx anyway

[likwid8]

yah all the best luck for you.... plus just be happy you got the knowlegde to do what you did and having a dvd burner just brights up ur day with all the new and kool stuff you can do with em, well take care...


likwid8

[wulf109]

DVD uses vob files which are mpg2. You can rip your DVD-R to your HD,like a retail DVD,and do anything to it you would do to a retail DVD.

[likwid8]

DVD uses vob files which are mpg2. You can rip your DVD-R to your HD,like a retail DVD,and do anything to it you would do to a retail DVD.

No. The DVD's vob files are not mpeg-2, because that would defeat the purpose of creating SVCD which are mpeg-2 compliant.... DVD vob files are 5000k bitrate, thats why the quality is very good, mpeg-2 is the compression we use on the guides to convert the DVD to SVCD...

DVD bitrate = 5000+ (Way more then mpeg-2, LOL)

SVCD bitrate = 2350+ (MPEG-2 files!)

Hope I helped both of you...

[wulf109]

Vob is simply hgh rate mpg2. If you demux a vob or mpg stream into it's elementary video stream will both produce an .m2v file.
You can author SVCD or even VCD into vob's and produce a DVD from the SVCD or VCD.

[likwid8]

yes u can author vcd/svcd onto DVD but note the quality wont be the same, my point was just to justify that an (mpeg-2) file is not used for DVD quality, ripping DVD to Mpeg-2 (SVCD) takes quite a bit of work rather then doing a 1 process task....unless you wanna go with DVD2SVCD, lol

[pikpus]

According to this interesting thread I found many answers
to my questions here but not all, that's why I'm asking.

This is my assumpion and questions inside:

0) source movies are my miniDV movies made by my digital camcorder

1) I'm using the TMPGenc to create dvd quality files
(I choose DVD in project wizard) ie. 720x576 25fps PAL
It creates files with *.mpg extention and bitrate 8000kbps.

Note: in my description I do not separate it to m2v (video) and
mp2 (audio) file just to simplify my description.


question:
a) Are the files MPEG2 files ?
For later discussion I assume that Yes.

2) Now from my files I'm creating DVD files structure
(http://www.vcdhelp.com/dvd "DVD file/folder structure")
using some tool.
I think that this process puts my movies in a few *.VOB files.
There are also some additional *.IFO files but they contain
some additional info, not movies themselves.
Am I right ?

questions:
a) I think that there is the need of format change ie. from mpeg2
to VOB vile
Am I right ?

b) If yes so does this change causes the quality loss of my mpeg2
movies ?

3) now I can burn DVDR.
between points 2) and 3) there is no quality loss.
Is it right ?

4) now I'm going to rip my a while ago burned DVD.
I do this using dvd decryptor v3.1.4 for example
it creates the the same structure as that achieved after doing 2).
so I also have my *.VOB files again.

questions :
a) Is the quality loss between movie on my DVDR and my *.VOB files I
have just ripped ?

b) Are my just ripped *.VOB files exactly the same as those I achieved
after performing point 2)

5) As you wrote now I can demux (I don't know how but it doesn't
matter now) my VOB files to high bit rate ie 8000kbps mpeg2 files
(as You wrote VOB files are some kind of high bit rate mpeg2 files)

Questions:
a) Is there any quality loss in this demuxing process ?

b) Will these high bit rate 8000kbps files be the same as those
achieved after performing point 1) ?


I couldn't find the straight answers to my questions it the thread and
anywhere else, and I think that many people would like to know the answer.
maybe You know it.

greetings and happy new year.
Maciej

[bhouseman]

To: Likwid8

I suggest you get your facts straight before you get into a verbal war with anyone.

DVD has ALWAYS been based on MPEG2 video encoding. The VOB structure is simply a packaging method for the video and audio streams. Many authoring programs can accept either AVI or MPEG2 video streams and author (REPACKAGE) them as VOB and IFO files to create a playable DVD structure. The video would still be MPEG2.

SVCD, on the other hand, is a specification for MPEG2 that requires 480x480 or 352x480 resolution with no more than 2600 MBits/s.

DVDs and SVCDs are therefore both MPEG2 video.

Now you know.

[likwid8]

so your saying is:

DVD = mpeg-2

Then why is DiVX = mpeg-4 ????

[cc2500]

MPEG3 supposedly was never implemented independently but rather became part of the MPEG2 spec (because it took so long to get out I guess). MPEG4 was not created by the MPEG consortium but rather by MICROSOFT (kings of the proprietary codec). MPEG4 was not based on the progression of MPEG1 and 2 but was a whole different compression scheme entirely, suitable for desktop and internet video.

DivX was originally a hacked version of the MPEG4 codec but with version 5 is now a completely separate (rewritten) codec with professional encoding features.

Gets a little confusing, doesn't it?

The MPEG4 codec is actually used on at least 1 digital camcorder which records to one of the flash memory storage cards on the market (I forget which type it supports), but the video is subpar to a regular DV camcorder because the MPEG4 compression is INFERIOR to DV compression or MPEG2 compression.

For the most accurate info on DVD structure/format, go to: www.dvd.org and read through their FAQs and for DivX, I'd start at www.divx.com.