File size reduction in Linux?

[Bob Elzer]

Or do you just need to split them apart to get them transferred and then put
them back together ??

 

-----Original Message-----
From: plug-discuss-bounces at lists.plug.phoenix.az.us
[mailto:plug-discuss-bounces at lists.plug.phoenix.az.us] On Behalf Of Matt
Graham
Sent: Saturday, December 12, 2009 10:53 AM
To: Main PLUG discussion list
Subject: Re: File size reduction in Linux?

From: mike Enriquez <mylinux at cox.net>
> I have a problem. I need to reduce my video files to from 40MB to 
> about 5-10 MB. My service provider says my files are too large and 
> blocks them. So I wonder if anyone has had this problem.
> Has anyone in the Linux community encounter this before?

Nope.  You're the first person who's ever needed to resize a bunch of video
files.  Actually, there's a very useful utility called ffmpeg that can
re-encode audio and video to a ton of different formats.  However, it's not
really n00b-friendly.  I used the file at
http://crow202.org/~mhgraham/presets.xml (originally part of a frontend
written in some bizarre dialect of Pascal) and a bit of shell to come up
with this:

#!/bin/bash
# converttoflv.sh
# no error checking at all.  Converts first arg to second arg ffmpeg -i $1
-vcodec flv -f flv -r 29.97 -s 320x240 -aspect \
4:3 -b 300kb -g 160 -cmp dct -subcmp dct -mbd 2 -flags +aic+cbp+mv0+mv4 \
-trellis 1 -ac 1 -ar 22050 -ab 56kb $2

...which, when invoked as "converttoflv.sh thing.avi thing.flv", will turn
thing.avi into a 320x240 FLV with a low bitrate audio stream at 22KHz and a
29.97 frames/sec framerate.  The resulting videos are suitable for
FlowPlayer and probably YouTube.  There are a metric ton of reasonable
presets in the XML file above, and they have descriptions.  You can roll
your own script(s) from that in about 30 seconds depending on your needs, or
modify the command lines to get something different.

There's probably something more polished out there, but the video
re-encoding projects I found via freshmeat/sourceforge were all
half-finished or special purpose.

--
Matt G / Dances With Crows
The Crow202 Blog:  http://crow202.org/wordpress/ There is no Darkness in
Eternity/But only Light too dim for us to see


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