What are WMV DivX XviD ASF RM RMVB MOV VOB IFO AOB video files?
Some Popular Video Files Format Overview
- What is 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 WMV version 7 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 video format
is originally based on hacked WMV codec.
- What is DivX XviD?
A new legal version of DivX video encoding technology, released
by company called DivXNetworks. Originally the development of
DivX codec went something like this: First there was Microsoft's
MPEG-4 codec. Hackers made a more flexible version of it and
started calling it DivX, XviD is an open source video codec
project which was launched in 2001 to continue Project Mayo's
open source DivX codec.
- What is 3GP?
3GP is a file format which is used in mobile phones to store media (audio/video). 3GP file format is a simpler version of "ISO 14496-1 Media Format". MOV (used by QuickTime) is also a format which follows similar file format. 3GP format can only carry video encoded as MPEG-4 or H.263. Audio is stored in AMR-NB or AAC-LC formats.
- What is 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.
- What is RM RMVB?
RM RMVB stands for Real Media. Streaming video and audio format
developed by RealNetworks. RM files is very small but the quality
is horrible. it can be decoded by special hardware or by software.
MPEG achieves high compression rate by storing only the changes
from one frame to another, instead of each entire frame. The
video information is then encoded using a technique called DCT.
- What is MOV QuickTime ?
- Quicktime is a multimedia development, storage, and playback
technology from Apple. Quicktime files combine sound, text,
animation, and video in a single file. Using a Quicktime player
that either comes with a Web browser or can be downloaded from
Apple or the browser company, you can view and control brief
multimedia sequences, Quicktime files can be recognized by their
file name extensions: *.qt, *.mov, and *.moov.
- What is VOB IFO AOB BUP files
? - The DVD-Video and DVD-Audio specifications
define how audio and video data are stored in specialized files.
The IFO files contain menus and other information about the
video and audio. The BUP files are backup copies of the IFO
files. The VOB files (for DVD-Video) and AOB files (for DVD-Audio)
are MPEG-2 program streams with additional packets containing
navigation and search information. Since a VOB file is just
a specialized MPEG-2 file, most MPEG-2 decoders and players
can play them. You may need to change the extension from VOB
to MPG. However, any special features such as angles or branching
will cause strange effects. The best way to play a VOB file
is to use a DVD player application to play the entire volume
(or to open the VIDEO_TS.IFO file), since this will make sure
all the DVD-Video features are used properly. Many DVDs are
encrypted, which means the VOB files won't play when copied
to your hard drive. If you try to copy the IFO and VOB files
to a recordable DVD it may not play. You may also run into VRO
files created by DVD video recorders using the -VR format. In
some cases you can treat the files just like VOB files, but
in other cases they are fragmented and unplayable. You'll need
a utility such as Heuris Extractor to copy them to a hard disk
in usable format.
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