Chroma Key
Chroma Key Compositing
A technique replacing a solid-color background (green screen) with another image or video.
Technical Detail
Video processing of chroma key involves multiple interdependent parameters: codec, container, resolution, frame rate, bitrate, color space, and audio track configuration. The MediaSource Extensions (MSE) API enables adaptive streaming in browsers, while the WebCodecs API provides low-level access to hardware encoders/decoders. Understanding chroma key is critical for balancing visual quality against bandwidth and storage constraints — a 1-minute 4K video at high quality can exceed 500 MB unoptimized.
Example
```html <!-- Chroma Key: HTML5 video with format fallback --> <video controls preload="metadata"> <source src="video.webm" type="video/webm; codecs=vp9,opus"> <source src="video.mp4" type="video/mp4"> Your browser does not support HTML5 video. </video> ```
Related Tools
R
Resolution Reference
B
Bitrate Calculator
F
Frame Rate Converter
T
Timecode Calculator
A
Aspect Ratio Calculator
F
File Size Estimator
S
Speed & Slow-Mo Calculator
S
Storage Planner
S
Subtitle Time Converter
B
Bandwidth Calculator
C
Color Space Reference
C
Codec Reference
P
Platform Specs Guide
C
Chroma Subsampling Guide
K
Key & Scale Reference
S
Screen Recording Guide
Related Terms
ABR
AV1
B-Frame
Bitrate (Video)
CBR
CFR
Chroma Subsampling
Color Grading
Container Format
CRF
DASH
Deinterlacing
Dolby Vision
Frame Blending
Frame Rate
GOP
H.264
H.265
HDR10
HLG
HLS
I-Frame
Interlacing
Key Derivation
Keyframe
Letterboxing
LUT
Motion Estimation
Muxing
Optical Flow
P-Frame
Pillarboxing
Proxy Editing
Public Key
Rec. 2020
Rec. 709
Stabilization
Subtitle
Timecode
Transcoding
Trimming
Two-Pass Encoding
VBR
VFR
Video Codec