Variable in shell script

Discussion in 'Programming' started by sanyi007, Dec 5, 2009.

0
  1. #1
    Hi all!

    I'm a beginner, and would like to create a shell script, which will get the length of an avi file, then halves it for cutting with mencoder... here is what i have now:

    #!/bin/bash
for file in /home/mysite/mydomain/myfiles/*.avi
do
moviedata= mplayer -vo dummy -ao dummy -identify $file 2>/dev/null | perl -nle '/ID_LENGTH=([0-9\.]+)/ && ($t +=$1) && printf "%02d:%02d:%02d",$t/2/3600,$t/2/60%60,$t/2%60' | tail -n 1

mencoder -endpos "$moviedata" -oac copy -ovc copy "$file" -o "$file.splitted.avi"
done
    Code (markup):
    It is really close to working... if you echo $moviedata, you get the half time in a formatted way, for example: 00:32:22.
    If i insert it into mencoder, it says "Error parsing option on the command line: -endpos"

    After that, i echoed the mencoder converter line, and i saw, that the $moviedata variable moved into the beginning of the line:

    
Here is the echoed line:
[B]00:51:19[/B]mencoder -endpos  -oac copy -ovc copy /home/mysite/mydomain/myfiles/1.avi -o /home/mysite/mydomain/myfiles/1.avi.splitted.avi

It should be like this:
mencoder [B]-endpos  00:51:19[/B] -oac copy -ovc copy /home/mysite/mydomain/myfiles/1.avi -o /home/mysite/mydomain/myfiles/1.avi.splitted.avi
    Code (markup):
    I hope someone can help me to make this script working.
     
    sanyi007, Dec 5, 2009 IP
  2. Kaizoku

    Kaizoku Well-Known Member

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    #2
    try backticks

    `mencoder -endpos "$moviedata" -oac copy -ovc copy "$file" -o "$file.splitted.avi"`
    `mencoder -endpos "${moviedata}" -oac copy -ovc copy "${file}" -o "${file.splitted.avi}"`

    If you want parse literal quote, I think you need to escape it.

    which ever works

    btw there is an easier way to get duration, using ffmpeg

    ffmpeg -i ${file} 2>&1 | grep "Duration" | cut -d ' ' -f 4 | sed s/,//
     
    Kaizoku, Dec 5, 2009 IP
  3. sanyi007

    sanyi007 Peon

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    #3 
    `mencoder -endpos "$moviedata" -oac copy -ovc copy "$file" -o "$file.splitted.avi"`
`mencoder -endpos "${moviedata}" -oac copy -ovc copy "${file}" -o "${file.splitted.avi}"`
    Code (markup):
    Hi, i tried both ways, but itdoesn't work, somehow it still ignores the data. ( $file and $file.splitted avi is accepted, only the $moviedata isn't, kinda weird, i'm sure there is something wrong with serving the variable, not the mencoder command itself)

    ffmpeg -i ${file} 2>&1 | grep "Duration" | cut -d ' ' -f 4 | sed s/,//
    Code (markup):
    Well, the problem with this is that i'm just a beginner... i only want to cut movies to half, so i need to divide the whole lenght of the movie with 2, but i can't do this here because the lack of knowledge :(. If you can give me an example where i will get the half time of the movie in this format: 01:20:11 (h:m:s) i would be really glad.

    I really don't know why the first command which i found is not working, i think it is something with serving the moviedata variable, something is wrong with the way i get it, i think.
     
    Last edited: Dec 5, 2009
    sanyi007, Dec 5, 2009 IP