What is Video Encoding? How Video Encoding Works? (2026 Updated)

Video encoding is the process of compressing raw video into an efficient format that can be streamed over the internet without consuming impossible amounts of bandwidth. A camera produces enormous, uncompressed files; encoding shrinks them dramatically using a codec, while preserving as much visual quality as possible. Without it, streaming as we know it simply would not exist.

Codecs, bitrates, and resolutions

A codec is the method used to compress and later decompress the video. H.264, also called AVC, is the most widely supported and plays on virtually every device. Newer codecs such as HEVC and AV1 deliver the same visual quality at a noticeably lower bitrate, which saves on delivery costs, but they require more modern hardware to decode. Bitrate is the amount of data used per second of video: higher bitrate generally means better quality and larger files. Resolution, such as 720p, 1080p, or 4K, describes the pixel dimensions of the picture.

Why streaming needs many versions of one video

A single encoded file cannot serve every viewer well, because audiences watch on wildly different screens and connections. Encoding therefore produces an adaptive ladder: several renditions of the same content at different resolutions and bitrates. The player then switches between these rungs in real time based on available bandwidth, stepping down to avoid buffering and climbing back up when the connection improves. This is the foundation of adaptive bitrate streaming.

Smarter encoding saves money

• Per-title encoding analyzes each video and assigns only as much bitrate as it actually needs
• Content-aware techniques spend more bits on complex scenes and fewer on simple ones
• Choosing the right mix of codecs balances broad device reach against bandwidth savings

Common questions about encoding

Which codec should I use?

H.264 offers the widest compatibility and is a safe default. HEVC and AV1 cut bandwidth for viewers on capable devices. Many operators encode in more than one codec and serve the most efficient option each device supports.

What is the difference between encoding and transcoding?

Encoding turns a raw source into a compressed format. Transcoding converts an already-encoded file into other formats or bitrates, which is what creates the adaptive ladder used for streaming.