recordVideoAndroid.sh

#!/bin/bash

# Based on https://gist.github.com/johnjohndoe/5398030 
checkForAndroidDevice() { 
  
  NOT_PRESENT="List of devices attached"
  ADB_FOUND=`adb devices | tail -2 | head -1 | cut -f 1 | sed 's/ *$//g'`
 
  if [[ ${ADB_FOUND} == ${NOT_PRESENT} ]]; then
    echo "Android device seems to be missing."
    return 1
  else
    echo "Android device found."
    return 0
  fi 
}

if ! checkForAndroidDevice; then        
    exit 1;
fi

# Check for Android version: at least KitKat
OS_VERSION=`adb shell getprop ro.build.version.release`
if [[ "$OS_VERSION" < "4.4.0" ]]; then  
    echo "Android OS version too old. KitKat or newer needed"      
    exit 1;
fi

# Create the destination dir, if it does not exists
adb shell 'mkdir -p /sdcard/recorded_video' 

NOW=$(date +%s)
FILENAME="rec_$NOW"

# Start the recording
adb shell screenrecord /sdcard/recorded_video/$FILENAME.mp4