ok, i have some programs that do encode as an mpeg 2 but does anyone know of a program out there that can encode as vob format? thanks again

-- Doug (mazinz@aol.com), February 01, 2000

Answers

LSX will give you DVD compliant mpeg2 files, after that its how you use the output I guess.

-- Ross McL (rmclennan@esc.net.au), February 01, 2000.

hey Ross thanks for the info. The dvmpeg program i have will let you convert to mpeg 2 format. i was just curious because i know dvds read a vob file extension, so i wasnt sure if they were really the same or if thats what it would turn the mpeg2 file into after lets say a dvd was burned. thanks

-- Doug (mazinz@aol.com), February 02, 2000.

DVMPEG does convert to mpeg-2 but do a double take: that is constant bit rate mpeg-2. One thing about the mpeg-2 .vob files for DVDs is that they ARE variable bit rate. If and when affordable DVD-R drives and media do come, and, say, Easy CD is still alive to reincarnate VCD Creator as DVD Creator, I'm not sure if these files will get accepted as valid files for DVD authoring.

-- EMartinez (epmartinez@yahoo.com), February 02, 2000.

I think there are several important restrictions in DVD authoring, its not just a case of using MPEG2 encoding and expecting a DVD out the other end:

In DVD, sound is restricted to a sample rate of 48kHz only. The general Mpeg2 specification allows for sample rates of 32, 44.1 and 48. So unless the DVD authoring software beyond the mpeg2 stage has the option to correct that you may not be DVD compliant unless your using the 48kHz sample rate.

Each video system under DVD mpeg2 has 4 frame size choices and MPEG-1 is restricted to only one size in each system, same as vcd.

Mpeg-1 SIF is the allowable DVD format and that is a constant bit rate format slightly higher than our VCD data rates. I am sorry Mr Emartinez but CBR is permitted in the specification for Mpeg2 based files and certainly the LSX DVD encoder projects allow for CBR as an option for encoding DVD compliant files.

The difficulties get even worse because in the choice for the variable bit rate; you are required to select the maximum BR, and then the tolerace on the average bitrate where the upper value is twice the lower value and it is possible to select incorrect rates. The maximum BR is 9.8Mbits/sec, not the 15 that the general mpeg2 spec allows for.

It seems that only two frame rates are permitted, 29.97 and 25Hz (some will no doubt challenge that and add 24).

The above is based on this site which gives some tabulated details that may help those considering the future.

http://www.mpeg.org/MPEG/DVD/Book_B/Video.html

Perhaps if people read this site they will begin to understand how difficult it may be to actually prepare for the future without actually carrying out a test now to check the choices made in advance.

If you consider I am wrong in the above then I suggest you take it up with the people concerned on the above mentioned web site. The LSX DVD encoder works with and provides for the options described above.

As I said yesterday in reply to another posting, be prepared for a shock when you go encoding in the full frame sizes and again in what you can actually fit onto an normal CD based archive.

-- Ross McL (rmclennan@esc.net.au), February 02, 2000.

Hi ppl,I was just wondering if any of u can refer me a software that will convert vob to mpeg.I can see that u r all trying to do vice versa.Plz email me the info.Thanks

-- shaon (shaon3@hotmail.com), April 06, 2001.