android-screen-to-gif.sh

#!/bin/bash -x

# How to install:
#   exo-open "http://developer.android.com/sdk/index.html#Other"
#   brew install libav-tools imagemagick ffmpeg
#   wget https://gist.githubusercontent.com/paour/0e0454ea63cbe19e91ac/raw/android-screen-to-gif.sh
#   chmod a+x android-screen-to-gif.sh

# Help message
function usage() {
	cat << EOF
Captures screen from Android device via ADB and converts it to a GIF.
Usage: ./android-screen-to-gif.sh output.gif [adb parameters]

EOF
}

# Output file
if [[ ! "$1" ]]; then
	usage
	exit 1
fi

TMP_MP4="/tmp/android-screen-tmp.mp4"
TMP_PALETTE="/tmp/android-screen-tmp.png"
OUT_GIF=$1
shift

echo $1
echo "$@"

# Cleanup
rm -f "$TMP_MP4" "$TMP_PALETTE"

# Record and pull video
echo "Starting recording, press CTRL+C when you're done..."
trap "echo 'Recording stopped, downloading output...'" INT
adb $@ shell screenrecord --verbose "/sdcard/tmp-android-screen.mp4"
trap - INT
sleep 5
adb $@ pull "/sdcard/tmp-android-screen.mp4" "$TMP_MP4"
sleep 1
adb $@ shell rm "/sdcard/tmp-android-screen.mp4"

# Convert to GIF
echo "Converting to GIF..."
FILTERS="fps=10,scale=640:-1:flags=lanczos"
ffmpeg -i $TMP_MP4 -vf "$FILTERS,palettegen" -y $TMP_PALETTE
ffmpeg -i $TMP_MP4 -i $TMP_PALETTE -lavfi "$FILTERS [x]; [x][1:v] paletteuse" -y $OUT_GIF

exit 0