blackatends

#!/bin/bash
# blackatends
# Accepts one or many video files as an input and determines how many frames of black are at the beginning and at the end
SCRIPTDIR=$(dirname "${0}")
. "${SCRIPTDIR}/mmfunctions" || { echo "Missing '${SCRIPTDIR}/mmfunctions'. Exiting." ; exit 1 ;};
VERSION=1.0

_cleanup(){
    _log -a "Process aborted"
    exit 1
}

trap _cleanup SIGHUP SIGINT SIGTERM

_usage(){
    echo
    echo "$(basename "${0}") ${VERSION}"
    echo "This program will report on the number of black frames at the beginning and end of a video file."
    echo
    echo "Usage: $(basename ${0}) file1 [ file2 ... ]"
    echo
    echo "Options:"
    echo "  -h display this help"
    echo
    exit
}
[ "${#}" = 0 ] && _usage

# command-line options for help and invalid options
OPTIND=1
while getopts ":h" OPT; do
    case "${OPT}" in
        h) _usage ;;
        \?) echo "Invalid option: -${OPTARG}" ; _writeerrorlog "blackatends" "You used an invalid option and the script had to exit" ; exit 1 ;;
        :) echo "Option -${OPTARG} requires an argument" ; _writeerrorlog "blackatends" "The option selected required an argument and none was provided. The script had to exit." ; exit 1 ;;
    esac
done
shift $(( ${OPTIND} - 1 ))

while [ "${*}" != "" ] ; do
    _log -b
    [ "${#}" != 0 ] && SOURCEFILE="${1}"
    _black_at_ends "${SOURCEFILE}"
    _log -e
    shift
done