Why Video files occupy more space than Audio files do?

[smith]

I have many video files in the form of AVI/RMVB/DVDRIP on the hard disk. I
found that these files really occupy much more space of disks than Audio
files like MP3/WMA/RM. Three video documentaries, each of which lasts for 1
hour, may make one DVD-R fully written, but 400 MP3 files that last for 30
minutes each won't take all the space of it. What is the reason?

In addition, if I want to store many video files, do I need a hard disk with
enormorous capacity?

 

[Edwin vMierlo]

I have many video files in the form of AVI/RMVB/DVDRIP on the hard disk. I
found that these files really occupy much more space of disks than Audio
files like MP3/WMA/RM. Three video documentaries, each of which lasts for 1
hour, may make one DVD-R fully written, but 400 MP3 files that last for 30
minutes each won't take all the space of it. What is the reason?

the reason is that video need to store more "bits", video files are just
larger, nothing you can do about that
therefore a film does not fit a CD, but needs to be on a DVD, DVD holds more
"bits" then a CD.

 

[Richard Urban]

Why are some words longer than others? It the content in the files pal.

Music by nature has less information in a given amount of time as compared
to video (which also usually contains music/voice).

--

Regards,

Richard Urban
Microsoft MVP Windows Shell/User
(For email, remove the obvious from my address)

Quote from George Ankner:
If you knew as much as you think you know,
You would realize that you don't know what you thought you knew!

 

[MicroFox]

yes and those videos are compressed!

2 hours of video that is not compressed fills one dvd that is 4.7 gb...
so...

you can either archive the videos onto dvd R, or get a huge new disk to put
them in.

 

[over]

Actually, a DVD is also compressed (just not as much as most AVI files).
Two hours of uncompressed video could take up more like 80-200GB
depending on the resolution of the video.

yes and those videos are compressed!

2 hours of video that is not compressed fills one dvd that is 4.7
gb... so...

you can either archive the videos onto dvd R, or get a huge new disk
to put them in.

 

[Jonny]

Would hardly consider AVI a form of compressed audio/video format. Standard
unmodified avi format has much more video information, and is considered
uncompressed. It is a hard drive space hog. Mpeg is compressed compared to
avi. DVD movie A/V uses a mpeg2 format.
--
Jonny

Actually, a DVD is also compressed (just not as much as most AVI files).
Two hours of uncompressed video could take up more like 80-200GB
depending on the resolution of the video.

 

[Jonny]

AVI format is basically, as written, audio/video from raw. Not compressed
at all. Video, by its very nature, requires much more data to reproduce its
various characteristics compared to audio.

MP3s are near the recent end of compression technology of audio. How big a
is a wav file compared to the same length audio for a mp3?

 

[MicroFox]

I know, but I wanted to keep it simple and not tell him that too...

Actually, a DVD is also compressed (just not as much as most AVI files).
Two hours of uncompressed video could take up more like 80-200GB
depending on the resolution of the video.