Video file types

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Guest

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.
 
Ray said:
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.
Click to expand...


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.
 
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.
Click to expand...

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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