WebM cutter

webm.sh

#!/bin/bash

usage() {
    echo "WebM cutter and uploader."
    echo "Usage:   $0 <source> <start time> <length> [-subs]"
    echo "Example: $0 video.mkv 00:10:15 00:00:30"
    exit 1
}

if [ $# -eq 0 ]; then usage; fi

FONTDIR=$HOME/.fonts
TMPFILE=/tmp/`date +%s`.webm
PASSLOG=/tmp/pass1
PASSTMP=/tmp/pass1.webm

FFMPEGOPTS="-q:a 0 -ss $2 -t $3 -vpre libvpx-720p -ac 2 -codec:a libvorbis -ab 128k \
            -strict -2 -map 0:0 -map 0:1 -passlogfile $PASSLOG"

if [[ $4 = "-subs" ]];
then
    mkdir -p $FONTDIR
    ffmpeg -dump_attachment:t "" -i "$1"
    mv -vf *.ttf *.TTF *.otf *.OTF $FONTDIR
    ffmpeg -i "$1" /tmp/subs.ass
    ffmpeg -i "$1" $FFMPEGOPTS -vf "ass=/tmp/subs.ass" -pass 1 $PASSTMP
    ffmpeg -i "$1" $FFMPEGOPTS -vf "ass=/tmp/subs.ass" -pass 2 $TMPFILE
    rm -f /tmp/subs.ass
else
    ffmpeg -i "$1" $FFMPEGOPTS -pass 1 $PASSTMP
    ffmpeg -i "$1" $FFMPEGOPTS -pass 2 $TMPFILE
fi

rm -vf $PASSLOG
rm -vf $PASSTMP

echo "Encoded file saved to $TMPFILE"
# abyss $TMPFILE # may uncomment this line and replace with your uploader command