rwx/sh/ffmpeg.sh

# ╭────────┬─────────┬───────╮
# │ ffmpeg │ devices │ reset │
# ╰────────┴─────────┴───────╯

_rwx_cmd_rwx_ffmpeg_devices_reset() { rwx_ffmpeg_devices_reset "${@}"; }
rwx_ffmpeg_devices_reset() {
	local module="uvcvideo"
	modprobe --remove "${module}" &&
		modprobe "${module}"
}

# ╭────────┬────────┬─────────╮
# │ ffmpeg │ device │ formats │
# ╰────────┴────────┴─────────╯

rwx_ffmpeg_device_formats() {
	local device="${1}"
	[ -n "${device}" ] || device="/dev/video0"
	ffmpeg \
		-f "v4l2" \
		-list_formats "all" \
		-i "${device}"
}

# ╭────────┬───────╮
# │ ffmpeg │ input │
# ╰────────┴───────╯

rwx_ffmpeg_input_blue_yeti() {
	local device="alsa_input.\
usb-Generic_Blue_Microphones_2051BAB04XY8-00.analog-stereo"
	set -- \
		-f "pulse" \
		-i "${device}" \
		-ac "2" \
		-ar "48000"
	local argument
	for argument in "${@}"; do echo "${argument}"; done
}

rwx_ffmpeg_input_dell_precision() {
	local device="alsa_input.\
pci-0000_00_1f.3.analog-stereo"
	set -- \
		-f "pulse" \
		-i "${device}" \
		-ac "2" \
		-ar "48000"
	local argument
	for argument in "${@}"; do echo "${argument}"; done
}

rwx_ffmpeg_input_file() {
	local file="${1}"
	local from="${2}"
	local to="${3}"
	[ -n "${file}" ] || return
	set -- \
		-i "${file}"
	if [ -n "${to}" ]; then
		set -- "${@}" \
			-ss "${from}" \
			-to "${to}"
	fi
	local argument
	for argument in "${@}"; do echo "${argument}"; done
}

rwx_ffmpeg_input_hdmi() {
	local device="${1}"
	[ -n "${device}" ] || device="/dev/video0"
	set -- \
		-f "v4l2" \
		-video_size "1920x1080" \
		-framerate "60" \
		-input_format "yuyv422" \
		-i "${device}"
	local argument
	for argument in "${@}"; do echo "${argument}"; done
}

# ╭────────┬────────╮
# │ ffmpeg │ output │
# ╰────────┴────────╯

rwx_ffmpeg_output_audio_fast() {
	set -- \
		-codec:a "flac" \
		-compression_level "0"
	local argument
	for argument in "${@}"; do echo "${argument}"; done
}

rwx_ffmpeg_output_audio_slow() {
	set -- \
		-codec:a "libopus" \
		-b:a "128k"
	local argument
	for argument in "${@}"; do echo "${argument}"; done
}

rwx_ffmpeg_output_file() {
	local file="${1}"
	[ -n "${file}" ] || return
	set -- \
		-y "${file}"
	local argument
	for argument in "${@}"; do echo "${argument}"; done
}

rwx_ffmpeg_output_video_fast() {
	set -- \
		-codec:v "libx264" \
		-preset "ultrafast" \
		-crf "0"
	local argument
	for argument in "${@}"; do echo "${argument}"; done
}

rwx_ffmpeg_output_video_slow() {
	local crf="${1}"
	local codec="${2}"
	[ -n "${codec}" ] || codec="libx264"
	if [ -z "${crm}" ]; then
		case "${codec}" in
		"libx264") crf="23" ;;
		"libx265") crf="28" ;;
		*) ;;
		esac
	fi
	set -- \
		-codec:v "${codec}" \
		-preset "veryslow" \
		-crf "${crf}" \
		-movflags "+faststart" \
		-pix_fmt "yuv420p"
	local argument
	for argument in "${@}"; do echo "${argument}"; done
}

# ╭────────┬────────╮
# │ ffmpeg │ record │
# ╰────────┴────────╯

rwx_ffmpeg_record_hdmi_precision() {
	local file="${1}"
	[ -n "${file}" ] || return
	# LATER alternative
	# shellcheck disable=SC2046,SC2312
	set -- \
		$(rwx_ffmpeg_input_hdmi) \
		$(rwx_ffmpeg_input_dell_precision) \
		$(rwx_ffmpeg_output_video_fast) \
		$(rwx_ffmpeg_output_audio_fast) \
		$(rwx_ffmpeg_output_file "${file}")
	echo "${@}"
	ffmpeg "${@}"
}

rwx_ffmpeg_record_hdmi_yeti() {
	local file="${1}"
	[ -n "${file}" ] || return
	# LATER alternative
	# shellcheck disable=SC2046,SC2312
	set -- \
		$(rwx_ffmpeg_input_hdmi) \
		$(rwx_ffmpeg_input_blue_yeti) \
		$(rwx_ffmpeg_output_video_fast) \
		$(rwx_ffmpeg_output_audio_fast) \
		$(rwx_ffmpeg_output_file "${file}")
	echo "${@}"
	ffmpeg "${@}"
}

# ╭────────┬────────╮
# │ ffmpeg │ reduce │
# ╰────────┴────────╯

rwx_ffmpeg_reduce() {
	local input="${1}"
	local output="${2}"
	local from="${3}"
	local to="${4}"
	[ -n "${output}" ] || return
	# LATER alternative
	# shellcheck disable=SC2046,SC2312
	set -- \
		$(rwx_ffmpeg_input_file "${input}" "${from}" "${to}") \
		$(rwx_ffmpeg_output_video_slow) \
		$(rwx_ffmpeg_output_audio_slow) \
		$(rwx_ffmpeg_output_file "${output}")
	echo "${@}"
	ffmpeg "${@}"
}