Old 02-23-2007, 11:51 AM Offline   #1 (permalink)



 
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Post Movie Formats

Compliled from the best of my knowlage, If I am mistaken or missing something please let me know.

3GP
3GP is an MPEG-4 video format used mostly in mobile phones. And is also played by quicktime v 6.5+.

3ivX
Video format based on MPEG-4 video standard with certain modifications. 3ivX can be compared pretty easily to DivX Wink format, but in this comparision 3ivX unfortunately loses in quality.

AC3
Dolby Digital (AC-3) is Dolby's third generation audio coding algorithm. It is a perceptual coding algorithm developed to allow the use of lower data rates with a minimum of perceived degration of sound quality.

This coder has been designed to take maximum advantage of human auditory masking in that it divides the audio spectrum of each channel into narrow frequency bands of different sizes optimized with respect to the frequency selectivity of human hearing. This makes it possible to sharply filter coding noise so that it is forced to stay very close in frequency to the frequency components of the audio signal being coded. By reducing or eliminating coding noise wherever there are no audio signals to mask it, the sound quality of the original signal can be subjectively preserved. In this key respect, a coding system like AC-3 is essentially a form of very selective and powerful noise reduction.

In the consumer electronics industry the Dolby Digital soundtrack can be found on the latest generation of LaserDiscs (in space where one of the analog tracks used to be), can be found as the standard audio track on Digital Versatile Discs (DVD), is the standard audio format for High Definition Television (HDTV), and is being used for digital cable and satellite transmissions.

ASF
"Advanced Streaming Format". Microsoft's new audio/video format, meant specifically for streaming purposes. It doesn't specify how the video or audio should be encoded, but instead just specifies the structure of the video/audio stream. This means that ASF files can be encoded with basically any audio/video codec and would still be in ASF format.

Many times ASF is confused with Microsoft's implementation of MPEG-4 video format, because most of the ASF streams are encoded using this technology.

Audio-TS
If you look at the files on a DVD, you will notice that most DVDs have both a VIDEO_TS and AUDIO_TS folder, but the AUDIO_TS folder is usually empty. DVD-Audio would be stored in an AUDIO_TS folder but is a separate format to DVD-Video.

AVC
AVC stands for Advanced Video Coding, also known as MPEG-4 part 10, or MPEG-4 AVC.

AVI
AVI stands for Audio Video Interleave. This is a container video format that specifies certain structure how the audio and video streams should be stored within the file. AVI itself doesn't specify how it should be encoded (just like the streaming format ASF), so the audio/video can be stored in very various ways. Most commonly used video codecs that use AVI structure are M-JPEG and DivX Wink. AVI contains code called FourCC which tells what codec it is encoded with.

BIN/CUE Images
BIN/CUE images are CD-Images that come in both a .bin and .cue file. The .cue file just stores information on the bin file for the burning software. This CD Image type is one of the most used today and is very reliable.

Cam
In this particular case, with Cam we mean a specific method how movie pirates create illegal bootleg copies of original movies. Cam method is basically just a guy who uses either regular or professional camcorder to shoot the movie either from TV or actually inside a movie theatre (in some Cam copies of movies you can actually see audience as well Smile. These bootleg copies are normally then encoded into VCD, SVCD or DivX format and distributed illegally over the Internet.

DivX
DivX was developed by bunch of hackers, most notably a guy called gej and it is based on Microsoft's version of MPEG-4 encoding technology, called as Windows Media Video V3.

Basically Microsoft's encoders didn't allow users to save MPEG-4 streams into AVI structure format, but forced users to use ASF instead. It also had some other limitations -- and those limitations were overriden in DivX. It also added a support for other than Windows Media Audio audio encoding technology, allowing users to have MP3 audio on their movies.

In 2001, original "developers" of this hacked (and therefor illegal) codec released a new legal version of DivX, called DivX (without smiley). DivX (without smiley) supports old DivX movies and also adds new features and better compression quality than "original" DivX.
The name, DivX, comes from now defunct CircuitCity pay-per-view DVD format called DIVX.

With DivX, you can store 50-120 minutes of relatively GooD quality video to one CD (740MB) (==most of the movies can be stored in one CD, unlike in VCD or SVCD). Only negative aspect DivX Wink has when it's compared to VCD is the fact that VCDs can be played with regular stand-alone DVD players and DivXs can't.
DivX, like many other MPEG-4 formats, can however be played with certain MPEG-4 compatible, stand-alone DVD/DivX players.

DVD-Screener (DVD-Scr)
A DVD Screener is a promotional copy of a motion picture sent by a movie studios (on a DVD-Video disc) before the official DVD release date to movie critics, censors etc. The term DVDSrc is used by movie pirates to describe the source material of a bootleg SVCD, DivX, XviD or DVDR copy of a DVD Screener. These copies are usually of high, near-retail quality, but often contain some little extras on the video stream.

These extras includes timers, scrollers, black & white scenes, logos and serial numbers. The scrollers contain information about a few things, such as why some scenes of the movie appear in black & white, or have anti-piracy information that tell you how to contact anti-piracy groups if you have rented or purchased a DVD Screener copy of a movie. Serials are used to help track where the DVD Screeners were sent to (if they are copied and end up on the street or Internet) but these are usually blocked out completely by pirates.

Movie studios often also leave logos or watermarks on Screeners. The issue of DVD Screener piracy has caused controversy in Hollywood; even at one stage resulting in a DVD Screener ban. Plans were also introduced for the production of encrypted DVD Screeners (using the AES 128-bit encryption standard) that would special equipment (more than just a mere DVD Player) to be played back.

Around the time of the Academy Awards ceremony used to be the most active time for DVD Screener piracy but efforts by the MPAA and FBI have seriously reduced it.

DVD-Rip
Bootlegged movie copy made directly from a DVD-Video disc and encoded into some other format, like SVCD or DivX.

MPEG-7
Most of the people always think of video encoding algorithms when they hear the magic word "MPEG". This is quite right for MPEG-7 as well, but not totally.

MPEG-7 doesn't itself offer any new encoding features and it is not meant for representing audio/video content, unlike its siblings MPEG-1, MPEG-2 and MPEG-4. Instead, it offers metadata information for audio and video files, allowing searching and indexing of a/v data based on the information about the content instead of searching the actual content bitstream.

NTSC
Color TV standard developed in the U.S. in 1953 by National Television System Committee. NTSC is used in United States, Canada, Japan, in most of the American continent countries and in various Asian countries. Rest of the world uses either some variety of PAL or SECAM standards.

Telecine
This term has two descriptions:

1) As movies are normally shot using 24.00fps framerate and American TV system, NTSC, uses framerate of 29.97fps, movie framerates need to be changed in order to get them play smoothly on TV.

This process, where studios add additional frames to the picture in order to increase the framerate, is called telecine. Process where various video editing tools reverse this process is called inverse telecine.

Technical details will be added later on.

2) Telecine also means a method to make an illegal bootleg copy of an original movie. Telecine method can be done in various ways, but normally it includes process where the movie is taken directly from the reel to digital format and then encoded into DVD-R, VCD, SVCD, DivX or XviD format. Other bootleg methods include Telesync, Screener, Cam and DVD-Rip.

Telesync
One of the multiple terms used by movie pirates to describe the source material that was used to make a bootlegged pirate copy, normally distributed in VideoCD, SVCD or DivX format.

Precisely Telesync means a copy which was shot in an empty cinema or from the projection booth with a professional camera, directly connected to the sound source.

TV-Rip
Term used mostly by Internet pirates to describe something that has been recorded from a subscription channel or from PRE-AIR Satellite feeds. PRE-AIR satellite feeds may have no channel logos on them but may have something small wrong with them like a slight flicker in the colours. Nearly every known current running series are released as TV-RIPs on the Internet by various release groups.

VOB
VOB stands for DVD Video Object. It is basically one of the core files found on DVD-Video discs and contains the actual movie data.

Basically VOB file is just a basic MPEG-2 system stream -- meaning that it is a file that contains multiplexed MPEG-2 video stream, audio streams (normally AC3 and DTS formats) and subtitle streams.

WMV
WMV stands for Windows Media Video -- developed and controlled by Microsoft.

WMV is a generic name of Microsoft's video encoding solutions and doesn't necessarily define the technology what it uses -- since version 7 (WMV7) Microsoft has used its own flavour of MPEG-4 video encoding technology (not very surprising, it's not compatible with other MPEG-4 technologies..). DivX Wink video format is originally based on hacked WMV codec.

XviD
An open source MPEG-4 video codec project which was launched in 2001 to continue Project Mayo's open source DivX codec.

Basically a short piece of history is required in here to understand this fully.

Original DivX Wink codec was not developed from the scratch, but was just a hacked version of Microsoft's WMV video codec. This version, best known as DivX Wink v3.11 alpha (which was the last official version of the hacked codec), quickly became ridiculously popular among videofreaks all over the world.

RMVB
RMVB is an abbreviation for Real Media variable bitrate. It is an extension of the RealMedia multimedia container format developed by RealNetworks.As opposed to the more common RealMedia container, which holds streaming media constant bit rate, RMVB is typically used for multimedia content stored locally. Files using this format have the suffix encoded at a .rmvb.
RMVB files are typically much smaller in file size than their .mpeg formats, while still retaining reasonable quality. For this reason, they have become common among file-sharing protocols such as Bit Torrent. Support is now available in a wide variety of multimedia players, including the proprietary RealPlayer 10 and the open-sourced Media Player Classic, using an appropriate DirectShow filter.

Thanks to Frank_Hardy -

.dat

A VideoCD or SuperVideoCD data file. Typically a .dat file found on VCD or SVCD disc contains MPEG-1 (in case of VCD) or MPEG-2 (SVCD) -encoded video and audio encoded in MP2 format.

However, as VCD and SVCD can contain variety of other content as well, it is easier to simply state that .dat contains whatever data is there on a disc for that particular track -- it can be a normal, plain audio/video data, but it can also contain subtitles or photos (JPEG -compressed).

VCD .dat files can be played with virtually all standard video software players, but in order to play SVCD .dat files, the system needs to have an MPEG-2 codec installed or the player has to have an integrated MPEG-2 decoding that supports SVCDs (one such player is open-source player called Media Player Classic).
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Old 02-23-2007, 11:58 AM Offline   #2 (permalink)



 
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Old 02-23-2007, 12:00 PM Offline   #3 (permalink)



 
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moved.....
 
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Old 02-23-2007, 04:43 PM Offline   #4 (permalink)

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this is a really good post though..

im gonna tag it for future questions
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Old 02-23-2007, 06:37 PM Offline   #5 (permalink)



 
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Originally Posted by JhJ View Post
this is a really good post though..

im gonna tag it for future questions
yea but he put it in the movies section
 
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Old 02-23-2007, 08:05 PM Offline   #6 (permalink)

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Originally Posted by bshepjr View Post
yea but he put it in the movies section
bshep 4 super
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