What is Video Encoding?
Video encoding converts raw or decoded frames into a codec-compressed bitstream. Encoder settings determine bitrate, quality, frame structure, profile, processing cost, and playback compatibility.
How Video Encoding works
Encoding begins with ordered frames and optional audio, then applies prediction, transforms, quantization, and entropy coding according to a selected codec. Rate control allocates bits across time, while GOP structure and reference choices determine seek behavior and resilience. The same master is commonly encoded into several resolution and bitrate combinations for different devices and networks. This stage precedes muxing or streaming packaging and is usually the most compute-intensive transformation in a delivery pipeline.
Key facts
- A profile selects permitted coding tools, while a level constrains properties such as picture size and processing demand; unsupported combinations can prevent decoder initialization.
- Two-pass encoding can analyze a complete recording before allocating bits, whereas live encoding must make rate-control decisions without knowledge of future scenes.
- Nominal bitrate is not a quality measure by itself: codec generation, resolution, frame rate, source complexity, and encoder decisions all affect the resulting image.
When Video Encoding matters
Encode uploaded masters into renditions suited to storage, playback, and adaptive streaming. Higher compression efficiency may demand more processing or newer decoders, narrowing compatible devices.