Video bitrate calculation

First we want to know how many kilobits are in 240 Megabyte.

240 MByte * 1024 = 245760 KByte * 8 bit = 1966080 kbit

The video is 1149 seconds (19:09 minutes) long, so we need to divide the 1966080 kbit by 1149 seconds.

1966080 kbit / 1149 sec = 1711 kbit/s

Next we need to subtract the audio bitrate from that (let's assume 96 kbit/s).

1711 kbit/s - 96 kbit/s = 1615 kbit/s

So you would set 96 kbit as the audio bitrate and 1615 kbit as the video bitrate.