Hardware encoding
Hardware encoding is video encoding done by dedicated chips, such as GPUs or built-in media engines, rather than by general software running on a CPU. Phones, laptops and broadcast encoders all use hardware encoders for speed. It is much faster and uses less power, though software encoders often reach better quality at the same bitrate.
Why it matters
Hardware encoding makes real-time video practical on phones, laptops and live production gear, and lowers power and server costs at scale. The tradeoff is that software encoders often squeeze more quality from each bit. Choosing between them affects live latency, encoding bills and the quality viewers see.
How it works
- A device includes a dedicated media engine, such as a block inside a GPU or phone chip.
- Software sends raw frames to that engine instead of compressing them on the main processor.
- The engine runs fixed encoding steps in silicon, which is much faster and uses less power.
- The compressed output, usually H.264, HEVC or AV1, returns to the app for streaming or saving.
Hardware vs software encoding: which is better?
Hardware encoding is better for speed and power use, while software encoding is usually better for quality at a given bitrate. Hardware suits live streaming, screen recording and phones, where real time matters. Software encoders such as x264 suit on-demand libraries, where spending more time per frame produces smaller files that cost less to deliver.
Should I use NVENC or x264 for streaming?
Use NVENC if you want to stream without slowing your computer, and x264 if you have spare CPU power and want slightly better quality at the same bitrate. NVENC runs on a dedicated part of NVIDIA GPUs, so games and other apps keep their performance. On recent GPUs the quality gap is small for most live streams.
Where it's used
Live sports streamers and live shopping apps use dedicated chips to turn camera feeds into streams in real time, trading a little compression efficiency for speed.
By the numbers
- NVIDIA's NVENC hardware encoder was introduced with the Kepler-based GeForce 600 series in March 2012. (Nvidia NVENC (Wikipedia))
