#!/bin/bash

AUDIO_DEVICE=pulse
VIDEO_DEVICE=/dev/video0

# Why does OUTPUT_CODECS have to specify -pix_fmt ?  Answered:
# https://stackoverflow.com/questions/37967120/ffmpeg-convert-from-h-264-high-444-profile-to-h-264-main-profile

# Why aac and libx264?  Browser support:
# https://gist.github.com/Vestride/278e13915894821e1d6f

# Explanation of -profile and -level:
# https://trac.ffmpeg.org/wiki/Encode/H.264

OUTPUT_CODECS='-c:a aac -c:v libx264 -pix_fmt yuv420p  -profile:v high -level 4.1 -movflags +faststart'
# OUTPUT_CODECS='-c:a aac -c:v libx264'
OUTPUT_EXTENSION=mp4

MAX_RECORDING_TIME=00:05:00

NOW=$(date -Iseconds)

OUTPUT=recording.${NOW//[:T]/.}.${OUTPUT_EXTENSION}
OUTPUT_LINK=recording.latest.${OUTPUT_EXTENSION}

VIDEO_OPTS='-framerate 30 -video_size 640x480'
VIDEO_OPTS='-input_format mjpeg -framerate 30 -video_size 800x600'
# VIDEO_OPTS='-input_format mjpeg -framerate 15 -video_size 1600x1200'

record()
{
	local timeout="${MAX_RECORDING_TIME+-t $MAX_RECORDING_TIME}"
	ffmpeg -hide_banner -loglevel error -stats \
		$timeout -f video4linux2 ${VIDEO_OPTS} -i "$VIDEO_DEVICE" \
		$timeout -f "$AUDIO_DEVICE" -i default \
		-c:v rawvideo  -pix_fmt yuv420p  -f xv win \
    ${OUTPUT_CODECS} \
		"$1"
}

silently() { "$@" >/dev/null 2>&1; }

silently amixer-enable-mic
banish
record "$OUTPUT"

[ -h "$OUTPUT_LINK" -o ! -e "$OUTPUT_LINK" ] && ln -sf "$OUTPUT" "$OUTPUT_LINK"