pre_conversion.sh

#!/bin/sh
#
# This is an example of a pre-conversion hook.  This script is always invoked
# with /bin/sh (shebang ignored).
#
# The first parameter is the full path where the video will be converted.
#
# The second parameter is the full path to the source file.
#
# The third argument is the name of the HandBrake preset that will be used to
# convert the video.
#

CONVERTED_FILE="$1"
SOURCE_FILE="$2"
PRESET="$3"

echo "pre-conversion: Output File = $CONVERTED_FILE"
echo "pre-conversion: Source File = $SOURCE_FILE"
echo "pre-conversion: Preset = $PRESET"

EXTENSION="$(echo "${SOURCE_FILE##*.}" | tr '[:upper:]' '[:lower:]')"
case "$EXTENSION" in
    avi|mp4)
        # Nothing to do.  Allow conversion of known video files.
        echo "pre-conversion: allowing file conversion."
        ;;
    mkv)
        # Do not convert MKVs.  Move the file to its final destination.
        EXTENSION="$(echo "${CONVERTED_FILE##*.}" | tr '[:upper:]' '[:lower:]')"
        if [ "$EXTENSION" = "mkv" ]; then
            echo "pre-conversion: file conversion not required, moving file."
            mkdir -p "$(dirname "$CONVERTED_FILE")"
            mv "$SOURCE_FILE" "$CONVERTED_FILE"
        else
            echo "ERROR: Destination file has unexpected extension '$EXTENSION'."
        fi
        ;;
    *)
        # Remove unknown files.
        echo "pre-conversion: preventing file conversion by removing file."
        rm "$SOURCE_FILE"
esac