Rockbox Export

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Author Xobes
Description A pair of user jobs for transcoding recordings for use on Rockbox, and specifically the Sansa e250. Can trancode with or without commercials. Last tested with MythTV 0.21, some options may have changed.
Supports


Rockbox Export

These scripts are what I use to convert mythtv recordings to smaller versions able to be played in rockbox[1] on my SanDisk Sansa e250.

The video and audio bit rates, as well as the resolution, were painstakingly tweaked to find an acceptable rate for the specific player I use. These files may prove to be a good starting point for someone else.

Note: I placed all these files in my home directory in a bin directory (/home/xobes/bin/) you'll probably want to use a different, yet similar, location.

Set up a User Job

/home/xobes/bin/myth_small_mpeg_no_commercials %CHANID% %STARTTIME% "%TITLE%" "%SUBTITLE%"
/home/xobes/bin/myth_small_mpeg %CHANID% %STARTTIME% "%TITLE%" "%SUBTITLE%"

The Code

mk_rockbox_mpg

This script is used by both of the previous example scripts. This is where the conversion actually happens.


Script.png mk_rockbox_mpg.sh

#!/bin/sh

# programs
NICE="/usr/bin/nice -n19"
FFMPEG="/usr/bin/ffmpeg"

# set up the options (hard coded 4:3 right now)
displayresolution="224x160"
vbitrate="200k"
abitrate="128k"
fps="25"

FM_ARGS="-threads 2 -y -i $1 -r $fps -s $displayresolution -vcodec mpeg2video -b $vbitrate -ab $abitrate -ac 2 -ar 44100 -acodec libmp3lame $2"

# run the commands
$NICE $FFMPEG $FM_ARGS
echo $OUTFILE

myth_small_mpeg_no_commercials

Script.png myth_small_mpeg_no_commercials.sh

#!/bin/sh
# expecting:
CHANID="$1"
STARTTIME="$2"
TITLE="$3"
SUBTITLE="$4"

OUTDIR="/myth/storage1/exports/rockbox"

# programs
NICE="/usr/bin/nice -n19"
MYTHTRANSCODE="/usr/bin/mythtranscode"
MYTHCOMMFLAG="/usr/bin/mythcommflag"
CONVERT="/home/xobes/bin/mk_rockbox_mpg"
SED="/bin/sed"

# convert space laden variables to have underscores instead (not used in lookup)
sed_str="s/[$\!@\/:;~#%^&*\`\(\)\"\'<>,.?]//g"
OTITLE=`echo $TITLE | $SED -e 's/[[ \t]]*/_/g' | $SED -e $sed_str`
OSUBTITLE=`echo $SUBTITLE | $SED -e 's/[[ \t]]*/_/g' | $SED -e $sed_str`

# files
TMPFILE="/tmp/$1_$2.tmp"
OUTFILE="$OUTDIR/$OTITLE-$OSUBTITLE-$STARTTIME.mpg"

# options
MC_ARGS="-c $CHANID -s $STARTTIME --gencutlist"
MT_ARGS="--showprogress -p autodetect -c $CHANID -s $STARTTIME --honorcutlist --mpeg2 -o $TMPFILE"

# bring it all together:

echo flag commercials
$NICE $MYTHCOMMFLAG $MC_ARGS

echo export commercial-free video stream
$NICE $MYTHTRANSCODE $MT_ARGS

echo reduce commercial-free video stream
$CONVERT $TMPFILE $OUTFILE

echo remove temporary files
rm -f $TMPFILE
rm -f $TMPFILE.map

myth_small_mpeg

Script.png myth_small_mpeg.sh

#!/bin/sh
# expecting:
CHANID="$1"
STARTTIME="$2"
TITLE="$3"
SUBTITLE="$4"

OUTDIR="/myth/storage1/exports/rockbox"

# programs
NICE="/usr/bin/nice -n19"
MYTHTRANSCODE="/usr/bin/mythtranscode"
MYTHCOMMFLAG="/usr/bin/mythcommflag"
CONVERT="/home/xobes/bin/mk_rockbox_mpg"
SED="/bin/sed"

# convert space laden variables to have underscores instead (not used in lookup)
sed_str="s/[$\!@\/:;~#%^&*\`\(\)\"\'<>,.?]//g"
OTITLE=`echo $TITLE | $SED -e 's/[[ \t]]*/_/g' | $SED -e $sed_str`
OSUBTITLE=`echo $SUBTITLE | $SED -e 's/[[ \t]]*/_/g' | $SED -e $sed_str`

# files
TMPFILE="/tmp/$1_$2.tmp"
OUTFILE="$OUTDIR/$OTITLE-$OSUBTITLE-$STARTTIME.mpg"

# options
MC_ARGS="-c $CHANID -s $STARTTIME --gencutlist"
MT_ARGS="--showprogress -p autodetect -c $CHANID -s $STARTTIME --mpeg2 -o $TMPFILE"

# bring it all together:
echo export commercial-laden video stream
$NICE $MYTHTRANSCODE $MT_ARGS

echo reduce commercial-free video stream
$CONVERT $TMPFILE $OUTFILE

echo remove temporary files
rm -f $TMPFILE
rm -f $TMPFILE.map