adb shell screenrecord /sdcard/test.mp4

Records the device's display to a .mp4 file

adb pull /sdcard/test.mp4

Download test.mp4 file from Android Device.

adb shell screenrecord [options] <filename>

Options:

--size WIDTHxHEIGHT

  Set the video size, e.g. "1280x720". Default is the device's main

  display resolution (if supported), 1280x720 if not. For best results,

  use a size supported by the AVC encoder.

--bit-rate RATE

  Set the video bit rate, in bits per second. Value may be specified as

  bits or megabits, e.g. '4000000' is equivalent to '4M'. Default 20Mbps.

--bugreport

  Add additional information, such as a timestamp overlay, that is helpful

  in videos captured to illustrate bugs.

--time-limit TIME

  Set the maximum recording time, in seconds. Default / maximum is 180.

--verbose

  Display interesting information on stdout.