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Vob file size
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tpeddi
Newbie
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23. October 2003 @ 07:47 |
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I purchased a 200Gig hard drive a few months back and began making backups of mv dvd's with smartripper. I've recently purchaced a Plextor PX-708A DVD-r/-rw +r/+rw with ezcd6. The part i dont understand that, for example, the movie 8 Mile shows to be 4.8Gig on the hard drive yet when i build a dvd in ezcd using these vob files, the software estamates the dvd to be 17.38Gig
Im aware of the muti layer/Larger space on comercial dvd's than on dvd-r's but this is sitting on the hard drive. I have dvdxcopy gold and i would rather put one dvd on two dvd-r's to maintain quality but three DVD's is pushing it.
I'm certain when i get the original dvd back i would be able to copy it to two dvd's with xcopy gold but i just want to understand this querk.
Thanks in advance for any help
-Tim
The Timin8or
This message has been edited since posting. Last time this message was edited on 23. October 2003 @ 07:51
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Minion
AfterDawn Addict
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23. October 2003 @ 15:10 |
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It Sounds Like an error in EZCD6, Maybe you should try something else to author the DVD cuz No DVD is that Big.....
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Wild0ne
Junior Member
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23. October 2003 @ 18:32 |
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................. yet !
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Discmania
Senior Member
2 product reviews
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24. October 2003 @ 13:04 |
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I have 8 Mile in Xvid format and it's only just over 1Gb!! I would urge you to try DVD Shrink also as then all movies will ne less than 4.38Gb. Even with a 200Gb hard drive the space will soon dissapear if you keep all copies on your HD.
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tpeddi
Newbie
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25. October 2003 @ 10:31 |
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Dont you sacrifice video and audio quality with apps like DVD Shrink? I dont mind using two DVD +r's if I maintain all quality? And I delete backups after I make two copies.
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Discmania
Senior Member
2 product reviews
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25. October 2003 @ 15:41 |
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That's fine if you want to do that but if I were you I'd try DVD Shrink too since on most movies if you rip the movie only (no extras) you can't tell any difference. I also have DVDXCopy but only use it on long movies when compression is more than about 30% or when the entire disc fits onto one DVD-R.
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tpeddi
Newbie
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26. October 2003 @ 10:04 |
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I was under the impression that all video files on a dvd's are compressed. Are different dvd's compressed at different rates?
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AfterDawn Addict
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26. October 2003 @ 10:15 |
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hi all
easy guides to use!
http://www.chrismccann.co.uk
also dvd arnt compressed as such! - you have to compress if the disc is over 4.36 gig to fit on dvd+-r's
Thx..
Nothing here to see, move along folks.
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tpeddi
Newbie
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26. October 2003 @ 11:23 |
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As such as what? My understanding is that dvd's use mpg compression. Dvd players have a mpg decompressor (if you will). I would think that files on a dvd are compressed to the max they could be. The only way to obtain more compression is to sacrifice actual data. Which is why you would loose quality when you shrink the file size. I'm going to read more before i sound like a idiot.
Ok i read up and understand a little better. What i would like to know is: is there a way to rip (backup) the dvd menus and such to put on the new dvd after you have "shrinked" the file sizes. Also, what is re-authoring?
The Timin8or
This message has been edited since posting. Last time this message was edited on 26. October 2003 @ 11:47
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Wild0ne
Junior Member
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26. October 2003 @ 12:51 |
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Quote Rotary - "you have to compress if the disc is over 4.36 gig to fit on dvd+-r's"
Why is this when the disc is 4.7gb ? Using DVD2One I find that I have to compress to 4.4 or 4.45gb to fit - shouldnt I be able to compress to 4.7gb ?
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Discmania
Senior Member
2 product reviews
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26. October 2003 @ 16:05 |
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1Gb = 1024mb so 4.38Gb = 4485mb. The difference between 4485mb and 4700mb (4.7Gb) is space available for the lead-in and lead-out inprint of the recording. All you should remember is 4.38 and not 4.7.
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Wild0ne
Junior Member
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26. October 2003 @ 21:04 |
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Ahhhhhhhhhh thx.But if 4.38Gb=4485Mb then shouldnt 4.7Gb=4812Mb ?
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Discmania
Senior Member
2 product reviews
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27. October 2003 @ 00:20 |
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Yes you are quite right (my mistake).
This message has been edited since posting. Last time this message was edited on 27. October 2003 @ 00:20
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Staff Member
2 product reviews
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27. October 2003 @ 07:01 |
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Actually I believe the issue with the 4.7GB number is the math being used. The correct formula is GB=Bytes/1024/1024/1024 (2^30). The number being used to get 4.7GB for a DVD is GB=Bytes/1000/1000/1000 (10^9). That means 4.7GB advertised is really 4.3772161006927490234375GB which gets rounded to 4.37GB. If you've bought a new IDE hard drive in the last couple of years it will probably use the same "marketing math" for it's size (40GB advertised ~ 37GB actual). The first place I ever saw this was when Iomega started making Zip and Jaz drives, but it may have started somewhere else.
This message has been edited since posting. Last time this message was edited on 27. October 2003 @ 07:02
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Discmania
Senior Member
2 product reviews
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28. October 2003 @ 06:53 |
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A brave effort Verbal but unfortunately we are not all math wizards and there is nothing more confusing than making things more confusing.
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AfterDawn Addict
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28. October 2003 @ 07:15 |
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hi all
I get confused just waking up in the morning, so the rest of the day is a complete blur?
anyone know where i am?
LOL
Thx...
Nothing here to see, move along folks.
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tpeddi
Newbie
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28. October 2003 @ 11:08 |
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Well at this point we are just playing around. anyone have an answer for my menu question. what about making a image file from a dvd. anyone know of a app that dose that?
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Discmania
Senior Member
2 product reviews
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28. October 2003 @ 14:04 |
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Nero will create an image file if you have the full version but not of a copyrighted DVD.
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Staff Member
2 product reviews
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29. October 2003 @ 03:45 |
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Quote:
A brave effort Verbal but unfortunately we are not all math wizards and there is nothing more confusing than making things more confusing.
That's all right. You don't really need to understand it, but when I see certain incorrect information I have a compulsive need to correct it. Guess that's why I'm a teacher. ;)
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Staff Member
2 product reviews
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29. October 2003 @ 06:31 |
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Ok, since I helped derail the thread and generally confuse things I suppose it's only fair that I try to help out a little. ;)
Quote:
The part i dont understand that, for example, the movie 8 Mile shows to be 4.8Gig on the hard drive yet when i build a dvd in ezcd using these VOB files, the software estamates the dvd to be 17.38Gig
Sometimes a DVD has multiple titles that have a lot of the same video and audio, usually for things like adding scenes in that were cut for the theatrical release or alternate endings. When I open Jay & Silent Bob Strike Back with DVD Shrink, it shows the main move being Titles 1 & 2 with a size of 5955MB combined, but when I drag this into the Re-author window it says Title 1 is 5295MB and Title 2 is 5440MB. That means most of the video and audio streams are used for both titles, but parts of it are only played in 1 title or the other. Since there's nowhere on the disc to play a different version of the movie I just backed up the bigger of the 2 titles. I don't know if this is what's happening with EZCD, but if it's trying to actually re-author the DVD itself it seems likely.
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I would think that files on a dvd are compressed to the max they could be. Which is why you would loose quality when you shrink the file size. I'm going to read more before i sound like a idiot.
It's true that DVD video uses MPEG-2 compression, but that doesn't automatically mean that it's compressed as efficiently as possible. My theory is that some movies are intentionally not optimized so that it will be more difficult to make a full copy (or for some other reason like poor encoder settings). When I backed up The Simpsons Season 1 I was able to fit 4 episodes on a DVD-R with no compression, but when I backed up Season 2 I could only get 3 to a disc, no matter which episodes I combined. Now I have a single Simpsons DVD that only has 4 Halloween episodes and it's on a DVD-5. Maybe I'm just reading more into this than there is, but my take on take on it is optimal compression is only guaranteed when it makes a difference in disc production costs, like fitting on a DVD-5 instead of a DVD-9.
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The only way to obtain more compression is to sacrifice actual data.
There are basically 2 ways to make a video stream smaller and with either you'll obviously have less data than you started with, but that's only 1 of 3 factors that determine playback quality.
1. Compress or Encode
Compress: If you are using a 1 Click program like DVD Shrink you're just removing data from the video, hopefully at the places that you're least likely to notice it.
Encode: You can also use an MPEG-2 Encoder like CCE or TMPGEnc to completely recreate the video stream, which gives you better quality, particularly for a bigger movie, but is a more complicated process to learn and requires at least a little more work on your part.
2. Movie Specifics
Depending on the actual content of the movie - the amount of change from frame to frame, the amount of detail, and how well the movie was encoded originally, some movies can be much smaller without sacrificing a lot of quality and some can't.
3. Viewing Hardware
Viewing on better equipment (like when I watch my backups on a friend's 65" widescreen HDTV monitor) will make imperfections more noticeable. The only guaranteed way to avoid losing any quality on high end equipment is to keep the original video stream, but for normal viewing equipment you can't always tell the difference.
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Well at this point we are just playing around. anyone have an answer for my menu question. what about making a image file from a dvd. anyone know of a app that dose that?
You can make an image with DVD Decryptor, but that won't do you any good if the movie is DVD-9 because you can't just compress the image. You have to remove the audio and subtitles that you don't want and compress individual video streams if you want to make it fit on a single disc. If you don't want to change or lose anything on a DVD-9 you have to split it across 2 discs.
What you need to do to split depends on whether you want to keep everything (menus and extras), whether the movie will fit on 1 disc by itself, and whether the menus and extras will fit on 1 disc without the main movie. Best case scenario for this (with DVD Shrink) - use DVD Shrink to make a disc with just the main movie, and then again to remove just the main movie, leaving functional menus and all the extras.
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Wild0ne
Junior Member
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29. October 2003 @ 15:16 |
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Vurbal - Good read thx.
Tpeddi - a simpler method would be to use a programme like Neodvd4plus after DVD2One or dvdshrink to create your own menus.
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Staff Member
2 product reviews
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30. October 2003 @ 05:08 |
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No problem. Always happy to ramble incoherently. ;)
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tpeddi
Newbie
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30. October 2003 @ 05:13 |
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Yes, a good read thx. I think i will stick with using two dvd-r's and dvd-xcopy for the movies I care about and WILL be shown on a hd monitor at a later date and use DVD Shrink and alike for one time viewers or kids movies. I have this anal-retentive streak in me that has to feel like my backup is as good as the original. I got this back when i had no hard drive space had a cdr burner and wanted to back up cd's. I didn?t trust mp3 to give me that warm fuzzy feeling of just as good as the original. So I always used .wav and direct copies. I've overcome this nowadays and have ten gig of mp3's at 128kbps but all my original cd's are backed up to 256kbps to maintain the warm without the fuzzy feeling.
The only movie I have backed up is lord of the rings and the two disk copy seems to be exact, warm, and fuzzy. My brother brought over a one disk copy and I can tell. No warm or fuzzy there.
This has been a fun conversation and my first time getting info this way. I usually just search and search until I figure it out. I?ve been doing it that way for 8 years now.
The Timin8or
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Staff Member
2 product reviews
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30. October 2003 @ 05:19 |
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Glad I could help.
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