If you’ve ever wondered why a two-hour movie fits in a few gigabytes instead of filling an entire hard drive, the answer is video encoding. Here’s a practical rundown of what it is, why it matters, and what to consider when you’re encoding video on your own server.
What Is Video Encoding?
Raw, uncompressed video is enormous — a camera sensor recording 30 frames per second is really just capturing 30 full-resolution photos every second, which adds up to gigabytes per minute of footage. Video encoding compresses that raw stream into a much smaller file using a codec, without destroying the video’s usability.
Most compression works by finding redundancy between frames. If two consecutive frames are nearly identical, the encoder can store the differences instead of two full frames — often shrinking file size dramatically with little visible quality loss.
Codecs, in Plain Terms
A codec (short for coder/decoder) is the software that compresses video during encoding and decompresses it during playback. The most common codec today is H.264 — nearly every phone, browser, and streaming platform supports it. Others you’ll encounter include HEVC (H.265), VP9, and AV1, each offering different trade-offs between compression efficiency, quality, and hardware support.
Codec is different from container format. The codec determines how the video data is compressed; the container (MP4, MOV, MKV, etc.) is the file format that wraps the compressed video, audio, and metadata together.
Encoding vs. Transcoding
The two terms get used interchangeably, but they’re not quite the same:
- Encoding is compressing raw video into a usable format for the first time, or converting it to a different codec.
- Transcoding is creating additional versions of an already-encoded video — different resolutions, bitrates, or formats — typically to serve different devices or connection speeds.
Transcoding is always a form of encoding, but not all encoding is transcoding.
Quality vs. File Size: The Trade-off
Higher-quality video means larger files, longer uploads, and more bandwidth for anyone watching. Lower-quality video is smaller and loads faster, but looks worse. Four factors mainly drive file size for a given codec:
- Duration — longer video, bigger file
- Resolution — more pixels, bigger file
- Frame rate — more frames per second, bigger file
- Motion — more movement in the scene, bigger file (static shots compress much better)
A rough guide to common resolutions:
| Resolution | Typical Bitrate | Best For |
|---|---|---|
| 360p | 350–800 kbps | Slow connections, smooth playback over quality |
| 720p (HD) | 1200–1900 kbps | Good general-purpose quality |
| 1080p (Full HD) | 1900–4500 kbps | High-quality playback where bandwidth allows |
| 4K (2160p) | 15,000+ kbps | Maximum quality; most viewers can’t stream it reliably yet |
Why Encoding Needs Real CPU Power
Encoding, especially at higher resolutions or with newer codecs like HEVC/AV1, is CPU-intensive — the encoder is running complex math on every frame to find the best possible compression. This is exactly the kind of workload that benefits from a high single-thread and multi-thread performance CPU rather than a general-purpose shared server, since encode time scales directly with available processing power.
That’s the whole idea behind KwikServer’s Encoding RDP — it’s built around AMD Ryzen 9 processors with high PassMark benchmarks specifically so encoding jobs that would crawl on a typical VPS finish quickly, with full admin access to run whatever encoding software you prefer.
A Quick Glossary
Frame rate — frames displayed per second (fps); common values are 24, 25, 30, and 60. Higher frame rates render motion more smoothly; lower rates can look more “cinematic.”
Bitrate — how much data the video uses per second, usually in kbps or Mbps. Higher bitrate generally means better quality, but only up to the limit of the source material.
Aspect ratio — the proportional relationship between a video’s width and height, e.g. 16:9 for most modern screens.
Resolution — the pixel dimensions of the video, such as 1920×1080 (commonly shortened to “1080p”).
Video encoding is what makes streaming, video calls, and fast uploads possible at all — understanding the basics makes it much easier to pick the right settings, and the right hardware, for what you’re producing.