Convert any video (i.e.: AVI, MOV, MP4) to MP4 or WEBM with FFmpeg. Has option to export MP4 with YUV planar color space so it works with QuickTime and Safari.

convert-video.sh

#!/bin/bash

# Version 1.0 2016-06-03 https://gist.github.com/kus/318f21b840df0b7a6377563ce717c184
# MIT license

# Prerequisites:
# Homebrew: http://brew.sh/
# Install FFmpeg via Homebrew: brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-libass --with-libquvi --with-libvpx --with-theora --with-libogg --with-libvorbis --with-opus --with-x265
# Make the script executable: sudo chmod u+x convert-video.sh
# Run: ./convert-video.sh

# Output directory
OUTPUT_DIR="output/"
# The video extension you want to target
EXTENSION=".mp4"
TRANSPARENT=false
# Output files. Change from true/false
# MP4
OUTPUT_MP4=false
# MP4 with YUV planar color space with 4:2:0 chroma subsampling (QuickTime/Safari support)
OUTPUT_MP4_YUV=false
# WebM
OUTPUT_WEBM=true
# Delete output directory
DELETE_OUTPUT_DIR=false
# Work out current directory
WORKING_DIR=$(cd "${0%/*}" && echo "${PWD}/")

# Delete output directory
if $DELETE_OUTPUT_DIR; then
	rm -rf "${WORKING_DIR}${OUTPUT_DIR}"
fi

# Create output directory if it doesn't exist
mkdir -p "${WORKING_DIR}${OUTPUT_DIR}"

# H264 https://trac.ffmpeg.org/wiki/Encode/H.264
# -preset (Preset)
# A preset is a collection of options that will provide a certain encoding speed to compression ratio.
# ultrafast, superfast, veryfast, faster, fast, medium, slow, slower, veryslow
# -crf (Constant Rate Factor)
# Quality 0-51: where 0 is lossless, 23 is default, and 51 is worst possible. A lower value is a higher quality and a subjectively sane range is 18-28
# Bitrates
# -b:v 500k -maxrate 500k -bufsize 1000k -b:a 128k
# Force AAC audio
# -codec:a libfdk_aac
# Encoding for dumb players / Apple Quicktime https://trac.ffmpeg.org/wiki/Encode/H.264
# You may need to use -pix_fmt yuv420p for your output to work in QuickTime and most other players. These players only supports the YUV planar color space with 4:2:0 chroma subsampling for H.264 video. Otherwise, depending on your source, ffmpeg may output to a pixel format that may be incompatible with these players.
# -pix_fmt yuv420p
# Divisible by 2
# You may need to make the video divisible by 2 when using certain options, if you do you can use this:
# -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2"

# WebM https://trac.ffmpeg.org/wiki/Encode/VP8
# -crf (Constant Rate Factor)
# By default the CRF value can be from 4–63, and 10 is a good starting point. Lower values mean better quality.
# You may need to use -pix_fmt yuva420p for your output to work in QuickTime and most other players. These players only supports the YUV planar color space with 4:2:0 chroma subsampling for H.264 video. Otherwise, depending on your source, ffmpeg may output to a pixel format that may be incompatible with these players.
# Divisible by 2
# You may need to make the video divisible by 2 when using certain options, if you do you can use this:
# -vf "scale=trunc(iw/2)*2:trunc(ih/2)*2"
FILES=(*${EXTENSION}) && \
for INDEX in "${!FILES[@]}"; do
	FOLDER_PATH=${FILES[INDEX]}
	FILENAME="${FOLDER_PATH##*/}"
	FILENAME_NO_EXTENSION="${FILENAME%.*}"
	if test "$FILENAME_NO_EXTENSION" != "*"; then
		echo "Converting ${FILENAME_NO_EXTENSION}..."
		if $OUTPUT_MP4; then
			ffmpeg \
				-i "${WORKING_DIR}${FILENAME}" \
				-vcodec h264 \
				-acodec aac \
				-preset slow \
				-crf 23 \
				-b:v 2500k -maxrate 500k -bufsize 1000k -b:a 128k \
				-y \
				"${WORKING_DIR}${OUTPUT_DIR}${FILENAME_NO_EXTENSION}.mp4"
		fi
		if $OUTPUT_MP4_YUV; then
			ffmpeg \
				-i "${WORKING_DIR}${FILENAME}" \
				-vcodec h264 \
				-acodec aac \
				-preset slow \
				-crf 23 \
				-vf "scale=trunc(iw/2)*2:trunc(ih/2)*2" \
				-pix_fmt yuv420p \
				-b:v 2500k -maxrate 500k -bufsize 1000k -b:a 128k \
				-y \
				"${WORKING_DIR}${OUTPUT_DIR}${FILENAME_NO_EXTENSION}_yuv.mp4"
		fi
		if $OUTPUT_WEBM; then
			if $TRANSPARENT; then
				AUTO_ALT_REF=0
			else
				AUTO_ALT_REF=1
			fi
			ffmpeg \
				-i "${WORKING_DIR}${FILENAME}" \
				-vcodec libvpx \
				-acodec libvorbis \
				-preset slow \
				-auto-alt-ref ${AUTO_ALT_REF} \
				-crf 30 \
				-b:v 2500k -maxrate 500k -bufsize 1000k -b:a 128k \
				-y \
				"${WORKING_DIR}${OUTPUT_DIR}${FILENAME_NO_EXTENSION}.webm"
		fi
	fi
done