videoedit.sh

videoedit.sh

#!/bin/bash

convert_to_seconds() {
    time="${1}"
    timev=(${time//:/ })
    timea[2]=1
    timea[1]=60
    timea[0]=$((60 * 60))
    index=$(("${#timev[*]}"))
    time_seconds=0
    while [[ "${index}" -gt 0 ]]; do
	index=$(("${index}" - 1))
	value=$(echo "${timev[${index}]}" | sed 's/^ *0*//g')
	[[ -z "${value}" ]] && value=0
	multiplier="${timea[${index}]}"
	time_seconds=$(("${time_seconds}" + ("${value}" * "${multiplier}")))
    done
    echo "${time_seconds}"
}

timeline_in_seconds() {
    while read line; do
	(echo "${line}" | grep -v '^[0-9:, ]*$') && {
	    echo "Invalid Input: contains chars other than [0-9:, ]: ${line}" 2>&1
	    echo "Example Input: 00:02:34, 00:04:43"
	    continue
	}
	timev=(${line//,/ })
	start=$(convert_to_seconds "${timev[0]}")
	end=$(convert_to_seconds "${timev[1]}")
	duration=$(("${end}" - "${start}"))
	duration=$([[ "${duration}" -lt 0 ]] && echo 0 || echo "${duration}")
	echo "${start}" "${duration}"
    done
}

split_video() {
    video="${1}"
    chunknum=0
    timeline_in_seconds | while read offset duration; do
	chunk="${video%.*}.${chunknum}.mp4"
	chunknum=$(("${chunknum}" + 1))
	[[ -e "${chunk}" ]] && continue
	[[ "${duration}" -le 0 ]] && unset duration
	ffmpeg -y -nostdin -hide_banner -hwaccel vaapi -ss "${offset}" ${duration:+-t ${duration}} -i "${video}" -autoscale 0 -filter_complex 'hwupload,scale_vaapi=1920:1080' -c:a aac -c:v h264_vaapi -profile:v constrained_baseline -ar 44100 -r 24 -b:a 128k -b:v 1000k "${chunk}"
    done
}

join_video() {
    video="${1}"
    combined="${video%.*}.combined.mp4"
    concatinput=$(mktemp)

    defer_join_video() {
	rm "${concatinput}"
    }
    trap defer_join_video EXIT

    [[ -e "${combined}" ]] && return
    split_video "${@}"
    chunks=$(ls -1 "${video%.*}"* | grep '\.[0-9]*\.mp4$')
    for video in ${chunks}; do
	video=$(realpath "${video}")
	echo "file ${video}" >>"${concatinput}"
    done
    ffmpeg -y -nostdin -hide_banner -hwaccel vaapi -f concat -safe 0 -i "${concatinput}" -c copy "${combined}"
}

join_video "${@}"