yet another scripting question

evilgold · 2009-04-01 01:25:18

Could some kind soul who understands bash scripting well enough explain to me a way to do the fallowing:

I have a directory containing video files, i'd like to convert ALL of them to mkv format with mencoder. The easiest way i can think of would be (if possible) using a small script that lists the contents of the DIR, then runs the command "vs" on each file. vs being an alias i setup for "mencoder -profile default"

Currently i have to do it manually like this:

vs filename-01.avi -o filename-01.mkv

What i'd like to do is have a command or 2 that runs vs on each file one at a time, and has the -o option of the same filename but with mkv in place of avi,

Also can anyone reccomend a good book for learning this sort of thing? I plan on taking a bash scripting course soon, but its been pretty booked for the past few months.

Procyon · 2009-04-01 01:42:50

You will need shopt to use aliases in bash scripts, and you also want *.avi to 'glob'(?) to nothing if there is nothing. So something like this may do:

#! /bin/bash
shopt -s expand_aliases nullglob
for file in *.avi; do
mkvname=$(basename "$file" .avi).mkv
echo Converting "$file" to "$mkvname"
vs "$file" -o "$mkvname"
done

big_gie · 2009-04-01 01:45:05

for f in *.avi; do
    vs ${f} -o ${f/.avi/.mkv}
done

Using ${variable/search pattern/replace to} you can do what you want

See:
Advanced Bash-Scripting Guide
http://tldp.org/LDP/abs/html/

ChoK · 2009-04-01 01:51:14

I use that to extract mp3 from flv files, I think it can help you.

# !/bin/sh

 
for fichier in *.mp3.flv
do
ffmpeg -i "${fichier}" -f mp3 -vn -acodec copy "${fichier/.mp3.flv}".mp3
rm -f "${fichier}"
done

exit 0

all my flv are name something.mp3.flv ,
I search for them, assign one to the "fichier" variable (file in french) and dump them to "${fichier/.mp3/flv}".mp3 --> this takes the original filename, cutting the .mp3.flv and replacing it by mp3, I delete the original, rinse and repeat.

evilgold · 2009-04-01 02:18:20

Thanks to everyone!

I used Procyon's script with a bit of a modification (full mencoder command instead of vs) and just made it /usr/bin/local/vs and removed the alias.

Seems to be working exatly as i wanted.

Interesting thing about the alias not working from the script...didnt know that would happen.

Arch Linux

#1 2009-04-01 01:25:18

yet another scripting question

#2 2009-04-01 01:42:50

Re: yet another scripting question

#3 2009-04-01 01:45:05

Re: yet another scripting question

#4 2009-04-01 01:51:14

Re: yet another scripting question

#5 2009-04-01 02:18:20

Re: yet another scripting question

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