helper_scripts - beandog's mostly dvds multimedia wiki

====== Helper Scripts ======

This is an archive of old stuff. Most things now I wrote into [[dvd_info]].

This is just a collection of little scripts.

=== avi2mpg ===

<code bash>
#!/bin/bash
F=`basename $1 .avi`
MPG=${F}.mpg
if [[ ! -f ${MPG} ]]; then
	mencoder $1 -o $MPG -profile dvd
	fi
</code>

=== close_trays ===

<code bash>
#!/bin/bash
eject -t /dev/dvd
eject -t /dev/dvd1
</code>

=== confcat ===

Strip all empty strings and commented strings

<code>
#!/bin/bash
grep -vh '^#' "$@" | grep -v '^$'
</code>

=== dumpchapters ===

<code bash>
#!/bin/sh
if [[ -n $1 ]]; then
	dvdxchap /dev/dvd -t ${1} > chapters.txt
else
	dvdxchap /dev/dvd > chapters.txt
fi
</code>

=== dumpsub ===

<code bash>
#!/bin/sh
CHAPTERS=""
if [[ ! -z $2 ]]; then
	CHAPTERS="-chapter ${2}"
	if [[ ! -z $3 ]]; then
		CHAPTERS="-chapter ${2}-${3}"
	fi
fi
echo mencoder dvd://${1} -ovc copy -nosound -vobsubout movie -o /dev/null -slang en -quiet ${CHAPTERS}
</code>

=== dumpvob ===

<code bash>
#!/bin/sh
mplayer dvd://${1} -dumpstream -dumpfile movie.vob
</code>

=== dvd_id ===

Once you pop in a DVD, it takes a few seconds to initialize and be able to read, even though the device shows as available.

This helper script just waits patiently until it can correctly read the DVD.

It calls the binary [[disc_id]] which you'll need installed first.

<code bash>
#!/bin/bash
EXIT_CODE=1
DEVICE=$1
if [[ -z $DEVICE ]]; then
	DEVICE=/dev/dvd
fi

if [[ ! -b $DEVICE ]]; then
	echo "Device $DEVICE doesn't exist" >&2
	exit 1
fi

while [[ $EXIT_CODE != 0 ]]; do
	/usr/local/bin/disc_id $DEVICE 2> /dev/null
	EXIT_CODE=$?

	if [[ $EXIT_CODE != 0 ]]; then
		sleep 1
	fi
done
</code>
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