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Old 11-28-2006, 03:45 PM   #1
rudlavibizon
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Batch converting video files


I would like to convert multiple video files using mencoder but i don't know which command to use. Is there an universal unix command that i can use to execute a program on multiple files?
I'm a newbie to linux and just started to learn the basic shell commands.
 
Old 11-28-2006, 04:53 PM   #2
fordeck
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You could use a for loop. Example:

Code:
$ ls -l
total 16
-rw-rw-r--  1 userbob userbob 0 Nov 28 14:43 file1
-rw-rw-r--  1 userbob userbob 0 Nov 28 14:43 file2
-rw-rw-r--  1 userbob userbob 0 Nov 28 14:43 file3
-rw-rw-r--  1 userbob userbob 0 Nov 28 14:43 file4
$
$
$ for i in file[1-4]; do mv $i "${i}.txt"; done
$
$
$ ls -l
total 16
-rw-rw-r--  1 userbob userbob  0 Nov 28 14:43 file1.txt
-rw-rw-r--  1 userbob userbob  0 Nov 28 14:43 file2.txt
-rw-rw-r--  1 userbob userbob  0 Nov 28 14:43 file3.txt
-rw-rw-r--  1 userbob userbob  0 Nov 28 14:43 file4.txt
$
Of course you would have to edit this to apply your conversion command.

Hope this helps.
Fordeck

Last edited by fordeck; 11-28-2006 at 04:55 PM.
 
Old 11-29-2006, 05:32 AM   #3
rudlavibizon
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Thanks for replying. I'll have to get more deeply into the matter. I've found some tutorials about shell scripting on the web . The problem i encountered is that mencoder asks for -o output option and that complicates the whole thing. I've not done any programming since high school (we were thought BASIC) and it will take me some time. Oh well...
 
Old 11-29-2006, 08:22 AM   #4
fordeck
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Actually you wouldn't have to script this, in the above example it was entered on the command line as shown.

I've not used mencoder, however if you post the syntax you're using to do single file I'll try to send you a small script that will do the job.
 
Old 11-30-2006, 11:16 AM   #5
rudlavibizon
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here is an example:

Code:
mencoder [input-file] -ovc copy -oac pcm -o [output-file]
 
Old 11-30-2006, 11:39 AM   #6
fordeck
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Ok, I don't have any files to test this on. But this one liner is meant to be entered in a terminal at the prompt. It assumes that you are converting <filename>.wmv files in the current directory to <filename>.pcm files, again in the current directory. If that was your intention you could simply cut the following line and paste it at the command prompt.

Code:
for i in *wmv; do mencoder $i -ovc copy -oac pcm -o "${i}.pcm"; done
Let me know if this is what you're after?

Regards,

Fordeck
 
Old 12-01-2006, 05:25 AM   #7
rudlavibizon
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Not exactly but i get the picture. Actually i was converting audio to pcm and just copying video (-ovc and -oac are options for video and audio codec) because mjpeg avi files from my camera have noisy audio playback in linux. So I did this:

Code:
for i in *AVI; do mencoder $i -ovc copy -oac pcm -o "pcm_${i}"; done
It was a success.

Many thanks

R.B.
 
  


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