Script for batch mencoder command

[elreteipos]

First of all, I am not familiar with shell scripting, so I'm asking for your help. I want to do
mencoder aVideoFile.avi -of mpeg -oac lavc -lavcopts acodec=mp2:abitrate=192 -af resample=44100:0:0 -ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=50 -vf scale,harddup -ofps 25 -zoom -xy 176 -o aVideoFile.mpgfor all files in /media/ipod and its subdirectories. How can I do that?

[colo]

find /media/ipod -type f -exec mencoder {} -of mpeg -oac lavc -lavcopts acodec=mp2:abitrate=192 -af resample=44100:0:0 -ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=50 -vf scale,harddup -ofps 25 -zoom -xy 176 -o {}.mpg \;

[elreteipos]

Thanks. There's one more thing I want to do: if both FILENAME.avi and FILENAME.avi.mpg exist, don't let mencoder convert the file again since it has already been converted. Is that possible by, perhaps, adding a "do-not-overwrite" parameter to the mencoder command?

[Mr. C.]

Do you want FILENAME.avi to convert to FILENAME.mpg or FILENAME.avi.mpg ?

Sometimes the find command gets too difficult to use to build complex commands, so its better to use find in combination with a shell script. The shell script does the basic job of encoding the file, but only if the file.mpg does not exist. The find command is responsible for sending do_encode the filenames to work on.

Here's your new find command:


find /media/ipod -name '*.avi' -type f -exec ~/do_encode {} \;

it will call a shell script called do_encode, which you will create as follows:


#!/bin/bash

function encode
{
echo mencoder "$1" -o "$2" -of mpeg -oac lavc -lavcopts \
acodec=mp2:abitrate=192 -af resample=44100:0:0 \
-ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=50 \
-vf scale,harddup -ofps 25 -zoom -xy 176
}

mpg=$(echo $1 | sed 's/\.avi$/\.mpg/')
if [ -e "$mpg" ] ; then
echo $1 already encoded to $mpg
else
encode "$1" "$mpg"
fi

Save the code above into a file named do_encode in your home directory, and changer permissions on it:


chmod a+x ~/do_encode

MrC

[elreteipos]

Do you want FILENAME.avi to convert to FILENAME.mpg or FILENAME.avi.mpg ?I think FILENAME.avi.mpg is easier for the program to recognize, so I'll use that format.

Does this work? ipodConvert:
#! /bin/bash
find /media/ipod -wholename *.avi -exec mencoderAVI {} \;
find /media/ipod -wholename *.mp4 -exec mencoderMP4 {} \;
find /media/ipod -wholename *.mov -exec mencoderMOV {} \;mencoderAVI:
#!/bin/bash

function encode
{
echo mencoder "$1" -o "$2" -of mpeg -oac lavc -lavcopts \
acodec=mp2:abitrate=192 -af resample=44100:0:0 \
-ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=100 \
-vf scale,harddup -ofps 25 -zoom -xy 176
}

mpg=$(echo $1 | sed 's/\.avi$/\.mpg/')
if [ -e "$mpg" ] ; then
echo $1 already encoded to $mpg
else
encode "$1" "$mpg"
fiSame for mencoderMP4 and mencoderMOV, but I replaced
mpg=$(echo $1 | sed 's/\.avi$/\.mpg/')with
mpg=$(echo $1 | sed 's/\.mp4$/\.mpg/')and
mpg=$(echo $1 | sed 's/\.mov$/\.mpg/')ipodConvert and the mencoder scripts are included in $PATH.

[Mr. C.]

It doesn't sound like there is a question here. You have it under control ?

MrC

[elreteipos]

I customized the script a little bit to suit my needs. I have a problem though:
pdedecker@BETAubuntu:~/Scripts$ vipodconv
[Skipped] /media/ipod/Video/EY5-full.avi
[Skipped] /media/ipod/Video/EY6-full.avi
[Skipped] /media/ipod/Video/EY7-full.avi
[Skipped] /media/ipod/Video/EY3-full.avi
[Skipped] /media/ipod/Video/EY4-full.avi
[Skipped] /media/ipod/Podcasts/Family's Naturally Sadie/0111 - Spring break.mp4
[Skipped] /media/ipod/Podcasts/Family's Naturally Sadie/0112 - Family and Friends.mp4
[Convert] /media/ipod/Podcasts/- Video Package - A PodShow Channel/commandN Episode 83.mp4
MEncoder 2:0.99+1.0pre8-0ubuntu8 (C) 2000-2006 MPlayer Team
CPU: Intel(R) Celeron(R) CPU 2.40GHz (Family: 15, Model: 3, Stepping: 4)
CPUflags: Type: 15 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 1 SSE2: 1
Compiled with runtime CPU detection.
File not found: '"/media/ipod/Podcasts/-'
Failed to open "/media/ipod/Podcasts/-.
Cannot open file/device.

Exiting...As you can see, mencoder is having trouble interpreting a directory name that contains the - symbol. Do you know how I can fix this?

This is vipodconv:
#! /bin/bash
find /media/ipod -wholename *.avi -exec vipodconv_mencoder "{}" \;
find /media/ipod -wholename *.mp4 -exec vipodconv_mencoder "{}" \;
find /media/ipod -wholename *.mov -exec vipodconv_mencoder "{}" \;
find /media/ipod -wholename *.m4v -exec vipodconv_mencoder "{}" \;

This is vipodconv_mencoder:
#!/bin/bash

function encode
{
mencoder \"$1\" -o \"$1.mpg\" -of mpeg -oac lavc -lavcopts \
acodec=mp2:abitrate=192 -af resample=44100:0:0 \
-ovc lavc -lavcopts vcodec=mpeg2video:vbitrate=100 \
-vf scale,harddup -ofps 25 -zoom -xy 176 -quiet
}

if [ -e "$1.mpg" ] ; then
echo [Skipped] $1
else
echo [Convert] $1
encode "$1" "$1.mpg"
fiAgain: both programs are accessible via the $PATH stuff.
And by the way, can mencoder also handle M4V files?

[Mr. C.]

When you escaped the quotes with backslashes in


mencoder \"$1\" -o \"$1.mpg\"

you removed the ability to protect the value passed as $1. The double quotes are required so that mencoder gets exactly what was passed inside $1.

I don't know what mencoder does with its arguments. See if you can pass a filename that contains a dash directly to mencoder itself. I also have no idea what mencoder can handle. Search the web for mencoder to find its home page. Perhaps its this: http://www.mplayerhq.hu/DOCS/HTML-single/en/MPlayer.html#mencoder

MrC

[cgreulich]

I'm trying to do something similar with FFMPEG, but I can't seem to make it work following this thread as an example. Here is what I'd like to do:

I'd like to be able to run a script named "encode" in any given directory and have it take all the files in the directory that I execute the script from and have it run this:

ffmpeg -i inputfile.avi -ab 128 -b 1000 -vcodec mpeg4 -s 360x240 -deinterlace outputfile.avi

where inputfile.avi is every file in the directory, and all of the encoded output files go into a subdirectory called /output retaining their original file names.

Is this possible to do? I'd really appreciate any help, I have about 500 home video files that I captured with Kino that I'm trying to encode and I can't find an easy way to do it.

[Mr. C.]

Put this in a file called ~/encode:


#!/bin/bash

mkdir output
for movie in *.avi ; do
echo Processing $movie
ffmpeg -i $movie -ab 128 -b 1000 -vcodec mpeg4 -s 360x240 -deinterlace output/$movie
done

Run this command to make it executable:

chmod a+x encode

and then run encode from inside your movie directory.


cd moviedir
~/encode

MrC

[cgreulich]

This works great!!!

Thank you so much for your help:)

[Mr. C.]

You're welcome.

MrC

[m2nmx]

Thank you very much Mr. C., the script works perfectly. Below I give example for using this script for processing whole directory with mencoder:


#!/bin/bash


for movie in *.avi ; do
echo Processing "$movie"
mencoder "$movie" -ofps 22 -vf-add scale=320:240 -vf-add expand=320:240:-1:-1:1 -srate 44100 -ovc xvid -xvidencopts bitrate=280:max_bframes=0:quant_type=h263:me_quali ty=3 -oac lavc -lavcopts acodec=mp2:abitrate=64 -o /home/TypeYourOutputDir/"$movie"
done