This is a simplified example and doesn't account for factors like compression efficiency and audio bitrate. Linux Book In Bengali - 3.79.94.248
The file size of a video $$(\text{in bytes})$$ can be estimated by multiplying the bitrate $$(\text{in bits per second})$$ by the duration $$(\text{in seconds})$$ and then dividing by 8 (to convert bits to bytes): Aly Berk Guide
$$ \text{File Size} = \frac{128,000 \times 60}{8} = 960,000 \text{ bytes or } 0.96 \text{ MB} $$
For example, for a 1-minute video (60 seconds) with a bitrate of 128 kbps:
$$ \text{File Size} = \frac{\text{Bitrate} \times \text{Duration}}{8} $$