Re: Avi compression


"Larry Johnson" <larry@xxxxxxxxxxx> wrote in message
news:sf5Of.32850$_c.13039@xxxxxxxxxxxxxxxxxxxxxxxxxx
If you want to keep the full DV-AVI quality the answer is, "no, there is
no way to compress it further and therefore make the file size smaller".
If you are just wanting a playable CD version of the file then the answer
is, "yes, you may use any number of software based codecs for this
purpose".

Software based codecs include: Cinepak, Quicktime, Indeo, DivX and many
more. You may choose a target data rate with most of them to reduce file
sizes. You may also use other techniques as well. Most software based
codecs use square pixels, and if I am assuming correctly that your video
file is DV- it uses non-square pixels.

So, if you original video is DV and you compress it using square pixel the
result is a squished looking picture. To avoid this you could use your NLE
program to crop 40 pixels on both left and right sides of the original
video turning it into a square pixel ready resolution of 640x480.
Otherwise the square pixel equivalent would be 720x540, which stretches
the video vertically to accomodate this resolution.

Other ways of reducing file size can be reducing the frame rate to 15fps,
or 14.98fps -half fps for non-interlaced and interlaced video
respectively. You can also reduce the audio sampling rate from 48kHz or
44kHz 16bit stereo to 22kHz to 8bit stereo. Actually there are many
choices of 16bit and 8bit stereo and mono audio combintaions.

Then again, you could encode this file to MPEG-2 and make a playable DVD
out of it. No matter what you do to reduce the file size to fit it on a CD
you will have to give up the notion of ever using it again within an
editing environment. Even if you use MPEG-2, somewhere down the line the
compression will reach up and bite you on the ass sooner or later.


"themire" <julian.keenaghan@xxxxxxxxx> wrote in message
news:1141298174.984988.279210@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi,

Simple question about compressing AVI files.

I have an AVI file that is ~730 MB and therefore won't fit on a CD.

How do I compress it a small bit so that it will?

Thanks,
Julian


Why do you assume that the OP has DV-AVI? My
guess would be that he downloaded a DivX or Xvid
movie.

Luck;
Ken


.

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