Video bitrate from image resolution and bit depth03 May 2023
To estimate the video bitrate based on image resolution and framerate, you can use the following formula:
Video Bitrate (bits per second) = Image Resolution (pixels) × Framerate (frames per second) × Bit Depth (bits per pixel)
The bit depth represents the number of bits used to represent each pixel in the video. It is typically 8 bits per pixel for standard video, but it can be higher for high-quality or professional content.
For example, let’s say you have a video with a resolution of 1920x1080 (2.07 million pixels) and a framerate of 25 frames per second (NTSC standard). Assuming a bit depth of 24 bits per pixel ( bits per color of RGB), the estimated video bitrate would be:
Video Bitrate = 2 073 600 pixels × 25 frames per second × 24 bits per pixel = 1.24 Gbps.
Keep in mind that this is a theoretical uncompressed bitrate, and the actual video bitrate may vary depending on factors such as video codec, compression settings, content complexity, and desired video quality.
For instance, when using the Prores 422 codec, the video bitrate would be around 185.7Mbps (15% of the uncompressed bitrate). Using Blueray H.264 compression, this could go as low as 38Mbps.