What's VOB?

A VOB file is an MPEG-2 system stream. This means that it complies 100% with the MPEG-2 system level standard, ISO 13818-1. However, VOB files are a very strict subset of the standard. So while all VOB files are MPEG-2 system streams, not all MPEG-2 system streams comply with the definition for a VOB file.

The VOB is a collection of one or more cells. An entire title could use just one VOB, but they usually use more. Sometimes the use is arbitrary, usually along the lines of a new VOB for each chapter, and within the VOB cells for each scene. This is not a requirement. In fact, there is only one place where seperate VOBs are required, and that is multiple angles.

A VOB contains several streams multiplexed together: Video, Audio and Subtitles. Video is MPEG-2, audio can be AC-3, Linear PCM, Mpeg 2 multichannel or MPEG1 layer2 2 channel audio. AC3 is pretty much the standard and MPEG-2 multichannel can only be found on very few discs (one example is "In the line of fire, PAL edition") as this format was initially considered to be the standard format in Region2 (Europe and Japan) but was later dropped. PCM is mostly found on music DVDs and MP2 on cheaper productions. PCM is high quality uncompressed audio which takes a lot of space, hence it's not an ideal choice for full length movies with extras and possibly multiple languages. AC3 streams have a bitrate between 192 and 448kbit/s. 192kbit/s is used for 2 channel sound, and 384-448kbit/s for 5.1channel surround.

A VOB can contain one main video stream and several multiangle streams, allowing you to switch (as an example) the perspective during the movie. This feature is mostly used to display storyboards or other extra features during playback. The maximum bitrate of the video stream is 9.8mbit/s. Together, video and audio stream must be below 10mbit/s at any given moment. It's possible to have up to 9 different audio streams and you can usually switch the audio stream during playback (this feature can be disabled during the authoring phase of a DVD). It's also possible to have up to 32 different subtitle streams. Subtitles are 4 color bitmaps which are overlayed over the video stream, they're usually not encoded into the video stream.

Related Articles:
What's DVD?
How to rip/convert dvd .vob on mac!

What's DVD?

DVD also known as "Digital Versatile Disc" or "Digital Video Disc" which is a popular optical disc storage media format. Its main uses are video and data storage. Most DVDs are of the same dimensions as compact discs (CDs) but store more than six times as much data.

Variations of the term DVD often describe the way data is stored on the discs: DVD-ROM has data which can only be read and not written, DVD-R and DVD+R can only record data once and then function as a DVD-ROM. DVD-RW, DVD+RW and DVD-RAM can both record and erase data multiple times. The wavelength used by standard DVD lasers is 650 nm[1], and thus has a red color.

DVD-Video and DVD-Audio discs respectively refer to properly formatted and structured video and audio content. Other types of DVDs, including those with video content, may be referred to as DVD-Data discs. As next generation High definition optical formats also use a disc identical in some aspects yet more advanced than a DVD, such as Blu-ray Disc, the original DVD is occasionally given the retronym SD DVD (for standard definition).

DVD contains two directories: VIDEO_TS(VIDEO_PS) and AUDIO_TS(AUDIO_PS). AUDIO_TS is used for DVD Audio and contains the audio files, whereas VIDEO_TS is used to store all data for the movie. There might be more directories which contain DVD-ROM features for your PC. And you can see there's 3 types of files on a DVD: .VOB, .IFO and .BUP.


Related Article:
The crack on DVD!
How to rip DVD video_ts on mac!

The crack on DVD!(Part 2)

The DVD discs can store from 4.7 gigabytes (GB) to 17.0 gigabytes (GB) with
the following configurations and capacities:
· 4.7 GB (Single Sided, Single Layer), referred to as DVD-5
· 8.5 GB (Single Sided, Dual Layer), referred to as DVD-9
· 9.4 GB (Double Sided, Single Layer), referred to as DVD-10
· 17.0 GB (Double Sided, Dual Layer), referred to as DVD-18



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how to rip dvd ts on mac!

What's DVD?

If you want to play a dvd on a portable device like iPod, iPhone, PSP, Zune, Apple TV etc., you need to rip the dvd to a video which are compatible with the player like MP4 video.

DVD contains two files:VIDEO_TS and AUDIO_TS. The AUDIO_TS is always empty, all the dvd information is packaged in VIDEO_TS. The easiest way to rip a dvd is using a third party software. Below are the simple steps about how to rip the dvd ts files to mp4 or other format on mac by iSkysoft DVD Ripper for Mac.

If you want more details about the program or advanced functions:
Video: Set video encoding settings by selecting a resolution, a frame rate, a bit rate and a video encoder.
Audio: Set audio encoding settings by selecting a sample rate, an audio channel, a bit rate and an audio encoder.
Tip: customize the outfile resolution by manually inputting the resolution values; change the output file name; change the output file save directory; snapshot; merge into one file and so on. here is a demo:
How to rip DVD to all sorts of video and audio files on Mac OS X

Below is the based 3 steps:

Download iSkysoft DVD Ripper for Mac!

Step 1: Add DVD files
Add DVD files by choosing from 'Load DVD' or 'Load IFO', IFO file is in the VIDEO_TS directory.


















Step 2: Select a format for the output file.


























Step 3: Click the 'Convert' to start convertion.

That's all.

The crack on DVD!(Part 1)

Region codes and countries:

Region code	Area
0	Informal term meaning "worldwide". Region 0 is not an official setting; discs that bear the region 0 symbol either have no flag set or have region 1–6 flags set.
1	Canada, United States; U.S. territories; Bermuda
2	Western and Central Europe; Western Asia; Egypt, Japan, South Africa, Swaziland; British overseas territories, French overseas territories
3	Southeast Asia; South Korea; Non-mainland China (Taiwan); Hong Kong
4	Australia; Oceania; Central and South America; Caribbean; Mexico
5	Ukraine, Belarus, Russia, Africa, Central and South Asia, Mongolia, North Korea.
6	Mainland China
7	Reserved for future use (found in use on protected screener copies of MPAA-related DVDs and "media copies" of pre-releases in Asia)
8	International venues such as aircraft, cruise ships, etc.[1]
ALL	Region ALL discs have all 8 flags set, allowing the disc to be played in any locale on any player.

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