Lowering the quality of a 9.4GB DVD to fit on a 4.7GB dvd???

[Super Warrior]

I own a 9.4GB DVD and I want to make a lower quality backup of It,so It'll fit on 1 DVD-R without having to put It on two DVD-Rs.

Once I ripped the DVD with smartripper,I tried useing TMPGEnc to try re-encodeing tracks to a lower quality DVD-compliant VOB file.And then planned on adding It in the place of the original DVD track and burning with nero.But once I was done encodeing VOB-DVD movie files in TMPGEnc,the audio either goes out of sync or It just stops after a bit.

Is there any program out there that would work and make this easier to do?

[SLK001]

Your problems are not with your encode. You encode the video, NOT the audio (at least, you shouldn't have!). The audio is 7200 seconds long. The original video clip was 7200 seconds long. The new video is 7200 seconds long. See a trend here?

Did you encode in FILM and forget to apply a 3:2 PULLDOWN on your result?

You need to describe in better detail exactly what you want to do. How large was the original main movie in GBytes? Are you trying to keep the "extras" crap?

[Super Warrior]

Your problems are not with your encode. You encode the video, NOT the audio (at least, you shouldn't have!). The audio is 7200 seconds long. The original video clip was 7200 seconds long. The new video is 7200 seconds long. See a trend here?

Did you encode in FILM and forget to apply a 3:2 PULLDOWN on your result?

I don't know what you mean by that or what this 3:2 pulldown is supposed to be.You are talking about TMPGEnc right?

You need to describe in better detail exactly what you want to do. How large was the original main movie in GBytes? Are you trying to keep the "extras" crap?

The DVD movie w/extras is all about 7 GB.I'm useing smartripper to rip the movie,TMPGEnc to reencode the movie files and nero to burn to DVD-R.

It has about 8 large DVD movie files in all(includeing extras).What I want to do is take each one and reencode them in TMPGEnc making lower quality versions.Then once finished,replace the original with the new reencoded version.Then when I've done them all like that,I plan to put them through nero's DVD-video thingy and burn It all to DVD like you'd burn/copy any other movie.With the extras&menues intact.

My theory on this seems pretty good and that It could work.Unfortunitly everytime I try reencodeing one of the DVD movie files in TMPGEnc,the damn audio keeps screwing up.It'll either go out of sync after the first few minutes or It'll stop completly.

[BJ_M]

SLK001 is right -- DON"T touch the audio ... it is already done for you ..


i think you are having problems in that trying to encode each vob at a time because you want to preserve menu and chapter points, and is giving you problems with audio which when chopped up like that will most likely be out of sync .. -- im sure there are many way of doing things and mine prob not the best - but i would just stream the audio into 1 file and the video into one file so im left with 2 files -- 1 an ac3 file and a vob (mpeg2 really) .. i would then ONLY encode the vob to a lower bit rate after first checking if it is a 23.97fps (known as 24fps film progressive) or a 29.97 interlaced movie (or sometimes you will get both - but that is another problem) -- if it is a 23.97 film prog. - you use dvd template ntsc film and conversly if 29.97 interlaced use dvd standard ... but remember the final fps will be played at 29.97 no mater what .. that is what SLK001 was refering to "pulldown" which if you want more info on there is a billion guides around ... as well as how to check for pull down (all of the above should take no time)

the end result will be a smaller mpeg than you started with but the lenth will be exactly the same ..

then with a dvd authoring program - add the ac3 file , add the new mpeg , create new vobs and use your original ifo ..

use SUBRIP if you need the subtitles -- but for SUBRIP you would have to rip the vobs as normal ..

if your authoring program wil not except ac3 5:1 files -- use besweet to convert to mpa or down convert to 2 channel (if 2ch was not already on the dvd).

[SLK001]

When you say "replace the original video with the new re-encoded one", do you mean you are REMUXing it back in? If so, then this will NOT work and you will have the problems that you mentioned. To successfully remux a file like this, the two have to have the EXACT same GOP structure. Because you frameserve a pseudo AVI into TMPG, which has no GOP structure, TMPG creates an entirely new structure. The only program that can do what you want is ReMPEG2 in conjunction with IFOEdit.

You also have the option of spanning two disks with the contents of the single, but even this can cause problems (and the need to change disks, etc).

I'm not sure that you will be happy with the results of your method. The resulting quality loss from a 2 to 1 bitrate reduction may be too high (usually is for me).

[rocknroll_1950]

Star Warrior, you obviously dont know what you are doing. you think you are but you dont. stick to ripping it onto 2 DVD-R's if you know how, or just forget about the extras and menu and stuff like thatso it will fit on one disc

oO ELVIS Oo

[Nostradumbass]

Just follow the instructions at http://mpucoder.dynodns.net/derrow/copy.html

[MoovyGuy]

When you say "replace the original video with the new re-encoded one", do you mean you are REMUXing it back in? If so, then this will NOT work and you will have the problems that you mentioned. To successfully remux a file like this, the two have to have the EXACT same GOP structure. Because you frameserve a pseudo AVI into TMPG, which has no GOP structure, TMPG creates an entirely new structure. The only program that can do what you want is ReMPEG2 in conjunction with IFOEdit.

I've reencoded using DVD2Avi->TMPGenc (video only) and muxed the original AC3 track back in. According to what your saying, this should not be possible. But I have several such backups that are in perfect sync.

I don't see how a video GOP (Group of Pictures) structure is going to affect the syncronisation of audio

I do however understand that framerate is important here as it applies to both audio and video ....

[sean madison]

If you are trying to keep the exact structure as the original dvd and compress and burn onto 1 blank dvd, hehe, it definitely wont work the way you are doing it.

Let's take a vob file that is used for special features.

If u were to rip by file mode in smart-ripper and play the entire vob, you will notice that the vob may actualy contain part of the actual movie plus special features and half of something else all in 1 file. This means that there are multiple audio files used to play just that 1 vob file which in return will NOT work the way you are wanting to do.

How about you just rip everything in movie mode in smart ripper then encode everything like that.

Do not have menus on the dvd and everytime u hit next it goes to another section of the dvd. For a beginner, maybe you should do that first.

[SLK001]

MoovyGuy,
Yes, what you are describing is the correct proceedure. What I was refering to, was taking the re-encoded video and re-inserting it back into a .VOB as the "new" video. For this to work, the GOP structures HAVE to be identical. The reason for all the jumping, jerking and ultimately, freezing, is that the .IFO files have all of the information about the original position of the GOPs in your film. If you replace it with a completely different structure, navigation will get lost, and freeze up. This is equivalent to modifying a file on your hard disk without going through the directory structure. As soon as the directory trys to access it, it is lost (and usually will return only garbage).

I don't see how a video GOP (Group of Pictures) structure is going to affect the syncronisation of audio

It doesn't... both the video and the audio are time-stamped. If the total times are equal, there should be no sync issues, provided the same flags are in each one (ie, like DROP TIME CODING, or NON-DROP TIME CODING).

[MoovyGuy]

Hey SLK001,

Yup, your right. I guess I was being a little to simplistic in looking at the problem.


Personally I think that Star Warrior should rip the moovy 8) properly as we all always do, and then regenerate VOBs for it with the authoring proggie of his choice.

Then, with a little IFO surgery the "extras" could be stitched back in to make a complete DVD, albeit with the moovy at a lower quality. The same of course could be done for each of the extras. Seems like a lot of work though ,,,

[robboughton]

why dont u just rip the m2v file and ac3 file with smartripper demux to singlefile (asumming u use win xp with a ntfs format to the h/d) then trim the m2v with remeg to make it say 3.5gig depending on the size of ur ac3file then load it in to spruce up and burn or create a disk image and burn with prassi or any other ac3 compatable dvd write program

[Super Warrior]

I don't think some of you understood what I was trying to do.

Let's say I ripped part of a movie with smartripper and that part of the movie was 900MB in file size.

I wanted to take It and reencode through TMPGEnc to make a lower quality version.Exactly the same,same running time,same file name,etc.Just with lower quality and hopefully half the filesize of the original.

Then once finished,replace the original where the files for the DVD movie are, with the newly encoded DVD movie file.If sucessful I wanted to do the same with the rest of the DVD files,hopefully lowering the overall file size to fit on a 4.7GB DVD-R.

I still think It could work but unfortunitly I could never get pass TMPGEnc's audio shortcomings.TMPGEnc is Useless when It comes to DVD stuff.Even If I were'nt trying to do what I wanted and instead was only looking to reencode the DVD movie files for Video CD or SVCD use,I still could'nt do It.Because TMPGEnc just can't handel the DVD stuff well and would keep messing up the audio everytime.


Ehhh maybe I'll take a stab at It later but for now I give up.I'm still a newbie to this DVD-R stuff.The only things I know how to do:Is make a complete copy of a DVD as long It's witthin 4.7GB or spread the DVD onto two DVD-R's If It's over that amount -Minus the extras&menues.

[BJ_M]

going around in circles here -- several are repeating the same thing i said and Star Warrior is back to audio problems - when audio should be the least of the problems.. and tmpgenc handles dvd very very well in fact ...

[kwag]

@ Star Warrior,
This thread should give you some ideas: http://www.kvcd.net/forum/viewtopic.php?t=597
The DVD templates (KDVD) are here: http://www.kvcd.net/dvd-models.html

Hope this helps,
-kwag

[Super Warrior]

going around in circles here -- several are repeating the same thing i said and Star Warrior is back to audio problems - when audio should be the least of the problems.. and tmpgenc handles dvd very very well in fact ...

I've always been stuck on the part of the audio,because the audio has always been my problem.I could probabley have done what I wanted to do all along,but It's worthless If the audio is messed up.

And tmpgenc can't handel DVD stuff well.Whenever I start tmpgenc up and the wizard comes on.I select DVD NTSC at 2000KBS.Then on the next screen I use the browse to open up the file I want to encode.Then on the next screen I don't choose any of the filters and proceed to the last screen where it shows the information like Layer-2 48000Hz 384kbps for audio,etc.

Then I click to encode the movie file.Now tmpgenc handels the video fine and the audio at first.But once the file is encoded and I go to play It,about 5 minutes into the encoded file the audio screws up.The video is fine but the audio is dead.

[Super Warrior]

@ Star Warrior,
This thread should give you some ideas: http://www.kvcd.net/forum/viewtopic.php?t=597
The DVD templates (KDVD) are here: http://www.kvcd.net/dvd-models.html

Hope this helps,
-kwag

Well thinks for trying anyway.But I have no idea what any of that stuff is.

[Nostradumbass]

I don't think some of you understood what I was trying to do.

Let's say I ripped part of a movie with smartripper and that part of the movie was 900MB in file size.

I wanted to take It and reencode through TMPGEnc to make a lower quality version. Exactly the same,same running time,same file name,etc.Just with lower quality and hopefully half the filesize of the original.

Then once finished,replace the original where the files for the DVD movie are, with the newly encoded DVD movie file.If sucessful I wanted to do the same with the rest of the DVD files,hopefully lowering the overall file size to fit on a 4.7GB DVD-R.

I've been successful at doing this with several DVDs using ReMPEG2 and IFOEdit. I've reMPEG'd the feature or the xtras or both depending on their size and what I wanted to keep. I'll also strip VOBs and/or audio streams to decrease VOB sizes.

ReMPEG2 has tools to transcode audio AC3->mpa, exchange VOB video streams (very handy for menu VOBs), and re-sizing subpictures.

Generally, I don't lower the average video data rate below about 4 mbps. If the stuff still won't fit, its time to split.

[Joe018]

i havent worked with dvd much. mostly svcd. but i recently just made a pretty good quality dvd-r with ac3 audio. and it really wasnt all that complicated.

a 7 gig dvd with just the 4 x files episodes about 180 mins of vid came in at 3.5 gig on the dvd-r.

i dont know if this will help you but. here is what i did

1. ripped "entire" dvd with smart ripper
2. used ifoedit to strip streams into one LARGE vob file came about 7 gigs
3. loaded the vob file into tmpegs latest version and used the tools to simpe demux the audio only into a 257 or so meg ac3 file.

4. Frame served vid only from the single vob using dvd2 avi using kwags
half d1 compliant template for video only
A: modified cbr from 2500/300 70% to 3000/2100 80%
5. popped both the m2v and ac3 file into dvd it pe burned to dvd-rw (sucess)
6. burned to dvd-r sucess

only complaint is with dvd it. making the chapters was a pain in the ass.
and for some wierd reason at one pointi t stopped being able to play the m2v file. however to make the chapters i just read the times off the display in my soft dvd player from the dvd-rw i had pre authored with. burned any way and it came out fine.

if anyone intrested to check out the quality mail me i'll email a 10 second clip of the vid only to you.

-J

[lrosado]

Do not touch the audio. leave it as an ac3 file and when you end up with an m2v file from tmpg then use an authoring program like scenarist and have the program put to two files together into a vob and you will not have these audio problems you are saying. read into what people are trying to tell you, and you will be fine.