Script - RemoveCommercials

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Revision as of 22:06, 14 October 2007 by Vangorra (talk | contribs)

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The follow script can be setup as a User Job to automatically flag and remove commercials from a recording.

#!/bin/sh
VIDEODIR=$1
FILENAME=$2
# Sanity checking, to make sure everything is in order.
if [ -z "$VIDEODIR" -o -z "$FILENAME" ]; then
        echo "Usage: $0 <VideoDirectory> <FileName>"
        exit 5
fi
if [ ! -f "$VIDEODIR/$FILENAME" ]; then
        echo "File does not exist: $VIDEODIR/$FILENAME"
        exit 6
fi
# The meat of the script. Flag commercials, copy the flagged commercials to
# the cutlist, and transcode the video to remove the commercials from the
# file.
mythcommflag -f $VIDEODIR/$FILENAME
ERROR=$?
if [ $ERROR -gt 126 ]; then
        echo "Commercial flagging failed for ${FILENAME} with error $ERROR"
        exit $ERROR
fi
mythcommflag --gencutlist -f $VIDEODIR/$FILENAME
ERROR=$?
if [ $ERROR -ne 0 ]; then
        echo "Copying cutlist failed for ${FILENAME} with error $ERROR"
        exit $ERROR
fi
mythtranscode --honorcutlist --showprogress -i $VIDEODIR/$FILENAME -o $VIDEODIR/$FILENAME.tmp
ERROR=$?
if [ $ERROR -ne 0 ]; then
        echo "Transcoding failed for ${FILENAME} with error $ERROR"
        exit $ERROR
fi
mv $VIDEODIR/$FILENAME $VIDEODIR/$FILENAME.old
mv $VIDEODIR/$FILENAME.tmp $VIDEODIR/$FILENAME
mythcommflag -f $VIDEODIR/${FILENAME} --rebuild
ERROR=$?
if [ $ERROR -ne 0 ]; then
        echo "Rebuilding seek list failed for ${FILENAME} with error $ERROR"
        exit $ERROR
fi
mythcommflag --clearcutlist -f $VIDEODIR/$FILENAME
ERROR=$?
if [ $ERROR -eq 0 ]; then
        # Fix the database entry for the file
        cat << EOF | mysql mythconverg
UPDATE 
        recorded
SET
        cutlist = 0,
        filesize = $(ls -l $VIDEODIR/$FILENAME | awk '{print $5}') 
WHERE
        basename = '$FILENAME';
EOF
        exit 0
else
        echo "Clearing cutlist failed for ${FILENAME} with error $ERROR"
        rm /usr/video/$FILENAME.tmp
        exit $ERROR
fi

See the discussion tab for tips on using the mpeg2 lossless transcoding.

If you use this scipt and have commercial auto-skip set then during playback you will notice that MythTV skips over parts of your program. This is because the information about where commercials are located is still available. Adding this query after the UPDATE and before the EOF will remove the commercial points and allow things to run smoothly.

DELETE FROM 

`recordedmarkup`

WHERE 

CONCAT( chanid, starttime ) IN ( SELECT CONCAT( chanid, starttime )

		 FROM 

recorded WHERE basename = '1042_20071013225900.mpg' );


Please note that this script will save the original file as ${FILENAME}.old. You should periodically remove these files to save space. If you want to remove them automatically, you could use the following command:

find /var/video -name \*.old -ctime 2 -exec rm {} \;

Place this command into a script in /etc/cron.daily or into crontab. This will remove all backup files that are older than 2 days.

Note:

I update this script as I make changes to my own system. You should watch this article so you're notified of changes as they occur. If you do not have a wiki account and do not wish to create one you should check back periodically to get changes.