move and rename

lib/ffmpeg.sh

@@ -0,0 +1,93 @@
+#!/usr/bin/env bash
+
+get_duration() {
+	local file="$1"
+	ffprobe \
+		-v error \
+		-show_entries format=duration \
+		-of default=noprint_wrappers=1:nokey=1 \
+		"${file}"
+}
+
+get_crop() {
+	local file="$1"
+	local duration
+	duration="$(get_duration "${file}")" || return 1
+	# don't care about decimal points
+	IFS='.' read -r duration _ <<<"${duration}"
+	# get crop value for first half of input
+	local timeEnc=$((duration / 2))
+	ffmpeg \
+		-y \
+		-hide_banner \
+		-ss 0 \
+		-discard 'nokey' \
+		-i "${file}" \
+		-t "${timeEnc}" \
+		-map '0:v:0' \
+		-filter:v:0 'cropdetect=limit=100:round=16:skip=2:reset_count=0' \
+		-codec:v 'wrapped_avframe' \
+		-f 'null' '/dev/null' 2>&1 |
+		grep -o crop=.* |
+		sort -bh |
+		uniq -c |
+		sort -bh |
+		tail -n1 |
+		grep -o "crop=.*"
+}
+
+get_stream_codec() {
+	local file="$1"
+	local stream="$2"
+	ffprobe \
+		-v error \
+		-select_streams "${stream}" \
+		-show_entries stream=codec_name \
+		-of default=noprint_wrappers=1:nokey=1 \
+		"${file}"
+}
+
+get_file_format() {
+	local file="$1"
+	local probe
+	probe="$(ffprobe \
+		-v error \
+		-show_entries format=format_name \
+		-of default=noprint_wrappers=1:nokey=1 \
+		"${file}")" || return 1
+	if line_contains "${probe}" 'matroska'; then
+		echo mkv
+	else
+		echo mp4
+	fi
+}
+
+get_num_streams() {
+	local file="$1"
+	ffprobe \
+		-v error \
+		-show_entries stream=index \
+		-of default=noprint_wrappers=1:nokey=1 \
+		"${file}"
+}
+
+get_num_audio_streams() {
+	local file="$1"
+	ffprobe \
+		-v error \
+		-select_streams a \
+		-show_entries stream=index \
+		-of default=noprint_wrappers=1:nokey=1 \
+		"${file}"
+}
+
+get_num_audio_channels() {
+	local file="$1"
+	local stream="$2"
+	ffprobe \
+		-v error \
+		-select_streams "${stream}" \
+		-show_entries stream=channels \
+		-of default=noprint_wrappers=1:nokey=1 \
+		"${file}"
+}