..as fast as bandwidth to the fileserver can allow, running encodes in parallel up to amount of processors. AAC seems compatible with HW decoders everywhere + also with Chromebooks, which invited me to create this:
#!/bin/bash -e
TEMP=/fast/temp
DOWN=2 #allow 1 more than max 'uploads' to keep encoding busy
UP=1 #limit in order to write in a streamlined fashion rather than trashing NAS/FS, due to potential race condition +1 might happen
[[ -z $1 ]] && echo "Usage: $0 <file> [file] [file].." && exit 0
FAACS=$(nproc)
PGID=$$ #limit scope for pgrep
cd "$TEMP"
sleeprnd() { echo $((RANDOM % ($(pgrep -xcg $PGID sleep)+1) +1)); } #random secs between 1 .. amount of sleep processes we're running
waitcount() { while [[ $(pgrep -xcg $PGID $1) -ge $2 ]]; do sleep $(sleeprnd); done; }
re-encode() {
ORIG="$1"
BASE="$(basename "$ORIG" .mkv)"
LOCAL="$BASE"_orig.mkv
DEST="$(dirname "$ORIG")"/"$BASE"_aac.mkv
#now wait for ample space to be available @TEMP
until [[ $(df --output=avail "$TEMP" | tail -n 1) -gt $(( 7 * $(du "$ORIG" | sed -e 's/\t.*//g') )) ]]; do sleep $(sleeprnd); done
waitcount cp $DOWN; cp -v "$ORIG" "$LOCAL"
mkvmerge --no-audio "$LOCAL" -o "$BASE"_noaudio.mkv
for TRACK in $(mkvmerge -i "$LOCAL" | grep ': audio' | sed -e 's/:.*//g' -e 's/.* //g'); do
mkvextract tracks "$LOCAL" $TRACK:"$BASE"_audio
waitcount faac $FAACS; ffmpeg -v 0 -i "$BASE"_audio -f wav - \
| faac -b 160 - -o "$BASE"_audio_$TRACK.aac &>/dev/null
done
mkvmerge "$BASE"_noaudio.mkv "$BASE"_audio_*.aac -o "$BASE".new.mkv
rm "$BASE"_*
waitcount cp $UP; cp -v "$BASE".new.mkv "$DEST"
touch "$DEST" -r "$ORIG"
#mv "$DEST" "$ORIG"
echo "$ORIG" >>/dev/shm/ramdisk/log
rm "$BASE".new.mkv
}
while [[ -n "$1" ]]; do
re-encode "$1" &
sleep 1
shift
done
wait
