#!/bin/bash
# Run this script in the dir containing all the flv files you wish to convert to x264.
# There are no arguments. The script will copy both the audio and video bitrates into
# the new file via mediainfo.

IFS=$'\012'
for file in $(find -maxdepth 1 -mindepth 1 -iname '*.flv'); do
    # find flv bitrate for video and audio
    vkbps=$(perl -e "print $(mediainfo --inform="Video;%BitRate%" "${file}") / 1000")
    akbps=$(perl -e "print $(mediainfo --inform="Audio;%BitRate%" "${file}") / 1000")
    outputname="${file%.*}.mkv"

    echo filename is ${file}
    echo videobit rate set to ${vkbps}
    echo audobit rate set to ${akbps}

    # do not overwrite existing mkv's
    if [[ -e $outputname ]]; then
        echo >&2 Output file already exists: $outputname
        echo >&2 Skipping...
        echo >&2

        continue
    fi

    HandBrakeCLI -i "${file}" -o "${outputname}" --encoder x264 bframes=2:subme=6:mixed-refs=0:weightb=0:ref=5:8x8dct=0:me=umh:direct=temporal:trellis=0:b-adapt=2 --vb ${vkbps} -2 -T --aencoder faac -B ${akbps} || rm -f -- "$outputname"
done