Small Script help

jeffmiller45 · 10-12-2010, 11:36 AM

Okay, I'm rather new to linux, and I have a dedi server. I know how to browse, install, remove etc, all the basics needed to use it.

I've installed flvtool2, memcoder and ffmpeg, and at the moment im converting avi files in to flv. Im then passing metadata using yamdi.

However, this process is very timely as im converting loads of avi files at a time.

Im looking for a script, or a way where I can execute one command/script and which will convert all files in the directory I specify, then run those converted files through yamdi.

Please help. Im guessing it would be some sort of loop, and then changing for each file?
Thanks in advance!

Jeff..

mf93 · 10-12-2010, 12:41 PM

try

Code:

$ <whatever command you are running> <address of directory for files>/*

ie
$ convert /home/user/files/*

jeffmiller45 · 10-12-2010, 01:04 PM

Im slightly confused.

Doesnt a script have to start with

PHP Code:



#!/bin/bash

Basically the process im running manually at the moment is this.

PHP Code:



ffmpeg -y -i /home/user/public_html/video/Video.avi -b 800k -r 25 -f flv -ar 44100 /home/user/public_html/video/Video.flv

Once this has completed (takes about ten minutes on my server) I then manually execute this to add metadata.

PHP Code:



yamdi -i /home/user/public_html/video/Video.flv -o /home/user/public_html/video/Video2.flv

Obviously this process can be very timely. So is there a bash script I can use that will count all avi files in a directory. Then for each avi, convert it, then add meta using yamdi, then move onto the next?

I;ve been looking around google to try and find something similar that someone else might of written and change it, but I'm having no luck.

Thanks

jeffmiller45 · 10-12-2010, 01:19 PM

Hi again,

I found this thread, would this work ?

http://www.linuxquestions.org/questi...pt-wip-718990/

I also found this, this should work right? I just need to change the hardcode to what I need

Quote:

#!/bin/bash
#
# Convert files for Tivo

DIR=/media/TiVo/queue

for i in `find $DIR -type f *`; do

ffmpeg -i $i -target ntsc-dvd /media/TiVo/GoBack/$i.MPG
mv $i /media/TiVo/original

done

mf93 · 10-12-2010, 05:29 PM

copy and paste

Code:

#!/bin/bash
echo "make sure this is run from the directory in which the videos are stored"
ls | grep .avi > avifiles
cut -d . -f 1 avifiles > filenames
for f in $(cat filenames)
do
ffmpeg -y -i "$f".avi -b 800k -r 25 -f flv -ar 44100 "$f".flv
yamdi -i "$f".flv -o "$f2".flv 
done

that should do it---make sure you run this from the director where you put your videos

grail · 10-13-2010, 12:58 AM

Well at least one issue I see with both scripts is that if any of the file have spaces in them then the for loop will perform word splitting and you will not get what you want.
You need to remember that the idea of a script is to take what you would do say 10 times and make it so you only run the script once.

So let us break down what you have so far:

Quote:

ffmpeg -y -i /home/user/public_html/video/Video.avi -b 800k -r 25 -f flv -ar 44100 /home/user/public_html/video/Video.flv
yamdi -i /home/user/public_html/video/Video.flv -o /home/user/public_html/video/Video2.flv

So these are the two command you would run by hand as many times as required.

Quote:

Doesnt a script have to start with

Code:

#!/bin/bash

Well not necessarily but we will assume, based on your subsequent posts, that this is the shell you wish to use.

So the starting script to work with just one file would look like:

Code:

#!/bin/bash

ffmpeg -y -i /home/user/public_html/video/Video.avi -b 800k -r 25 -f flv -ar 44100 /home/user/public_html/video/Video.flv
yamdi -i /home/user/public_html/video/Video.flv -o /home/user/public_html/video/Video2.flv

Easy enough. I would then leave this part and then try and find a way to get all the files you are looking for.
Example 1

Code:

#!/bin/bash

for i in /media/TiVo/queue/*
do
    echo "$i"
done

This will work just fine as long as you know that there are no files in here that are not what you want and that there are no directories (note: word splitting is not an issue here)
Should you want only those items ending in '.avi' this can be appended to the asterix but will not rule out directories.

So then, as you rightly guessed you can go with find. The problem is that output from a command substitution [`` for you or $() for mf93] do undergo word splitting so any files returned that have
a space (ie. this is a nice.avi) will return each part, so not what you want.

A more robust solution is to redirect your find into a while / read loop, like so:

Code:

#!/bin/bash

while read -r line
do
    echo "$line"
done< <(find /media/TiVo/queue/ -type f -iname '*.avi')

Now you can still use your DIR variable, I am just overstating here.
Things to note here:

1. * at the end of your find would have yielded an error
2. -iname allows us to ignore case so we get, avi AVI aVi
3. there is a space between the 2 symbols < ... this is very important

So let me know if you get stuck but this should help, you only have to put the 2 together and work out your variables.
Remember also that as we may be worried about spaces that quotes ("") around your variables are a must.