What is the function of a video codec in digital video production?

• A. To compress and decompress video files for storage and transmission.
• B. To edit video frames directly.
• C. To increase display resolution.
• D. To add subtitles.

Answer: (A)

A video codec is responsible for compressing and decompressing video data so it can be stored efficiently and transmitted over networks. When you encode, the codec uses algorithms to remove redundant information and represent the video in a way that takes up less space, often balancing quality, bitrate, and computational needs. When you decode, that compressed data is reconstructed back into playable video for editing, viewing, or further processing. This makes workflows practical—from archiving large footage to streaming online.

Other tasks in the production chain aren’t the codec’s job. Editing frames directly is done by editing software, not by the codec. Increasing display resolution is upscaling, a processing step that occurs after decoding, not a function of the codec itself. Adding subtitles is handled as separate data tracks or tools that accompany the video, not part of the encoding/decoding process.