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Ray

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Since: Feb 04, 2005
Posts: 55



(Msg. 1) Posted: Mon Oct 10, 2005 1:39 am
Post subject: Video file types
Archived from groups: microsoft>public>windowsxp>newusers (more info?)
What is the difference between the various video file extensions - .avi,
..dat, .mpeg etc.? I notice .avi files take up a considerably larger space
compared to .dat for example.

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Sparda




Joined: Jun 27, 2005
Posts: 2062



(Msg. 2) Posted: Mon Oct 10, 2005 6:11 am
Post subject: Re: Video file types [Login to view extended thread Info.]
The type of video isn't necessarily defined by the file extension, for example you could rename a video file to .bmp and as long as you have a good player, it will work out what kind of video file is based on what information is available from the file it's self, rather then assuming it's a image based on the file extension. However, in this case avi is unencoded video, which will take up lots of space. mpeg is either mpeg 1 or mpeg 2 encoded and takes up less space. Additionally, avi files often are not plain audio and video, it is common place for them to be mpeg 4.

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"Vanguard \

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Since: Sep 06, 2005
Posts: 46



(Msg. 3) Posted: Mon Oct 10, 2005 9:57 am
Post subject: Re: Video file types [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"Ray" <Ray.TakeThisOut@discussions.microsoft.com> wrote in message
news:64567CE5-0790-421B-B175-829307CF3C7F@microsoft.com...
> What is the difference between the various video file extensions - .avi,
> .dat, .mpeg etc.? I notice .avi files take up a considerably larger space
> compared to .dat for example.


Different methods of formatting the data within a file for the same video
output. Write a note in Notepad and save it in a .txt file. Write the same
text string in a Word .doc file. Notice the .doc file is larger than the
..txt file. Same text string, different formatting of the data to store that
content. A 14-byte .txt file will blow up to a 19KB .doc file.

Google can provide LOTS of articles describing the various video formats.
For example, search on "video file formats" and you find some.

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