Image MIME Reference
JPEG-XS-Codestream
JPEG XS Codestream
image/jxsc
VS
JPEG XS Image Sequence (HEIF Container)
image/jxss
JPEG-XS-Sequence
A complete technical comparison of JPEG XS Codestream and JPEG XS Image Sequence (HEIF Container) — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.
Equal browser support
Feature Support
| Feature | JPEG-XS-Codestream | JPEG-XS-Sequence |
|---|---|---|
| Transparency (Alpha) | Yes | Yes |
| Animation Support | ✕ No | Yes |
| Progressive Loading | ✕ No | ✕ No |
| HDR Support | Yes | Yes |
| EXIF Metadata | ✕ No | Yes |
| ICC Color Profile | ✕ No | Yes |
JPEG XS Codestream
image/jxsc
Extension
.jxsc.jxs
Container
None (Raw Codestream)
Compression
Lossy (Visually Lossless) / Mathematically Lossless
Algorithm
JPEG XS (ISO/IEC 21122-1)
Color Depth
8-bit, 10-bit, 12-bit, 14-bit, 16-bit
Developed by
Joint Photographic Experts Group (JPEG) / intoPIX
Released
2019
Magic Bytes
FF 10
JPEG XS Image Sequence (HEIF Container)
image/jxss
Extension
.jxss.jxs
Container
HEIF / ISOBMFF (ISO/IEC 23008-12)
Compression
Lossy (Visually Lossless) / Mathematically Lossless
Algorithm
JPEG XS (ISO/IEC 21122-1)
Color Depth
8-bit, 10-bit, 12-bit, 14-bit, 16-bit
Developed by
Joint Photographic Experts Group (JPEG)
Released
2019
Magic Bytes
XX XX XX XX 66 74 79 70 6A 78 73 73
Browser Support Comparison
| Browser | JPEG-XS-Codestream | JPEG-XS-Sequence |
|---|---|---|
Chrome
|
✕ | ✕ |
Firefox
|
✕ | ✕ |
Safari
|
✕ | ✕ |
Edge
|
✕ | ✕ |
IE (Legacy)
|
✕ | ✕ |
JPEG-XS-Codestream
JPEG-XS-Codestream Strengths
- Eliminates container overhead, maximizing parsing speed and minimizing latency to fractions of a millisecond
- Highly optimized for direct hardware implementation in FPGAs and ASICs
- Perfect for continuous data streaming over IP networks without needing to establish file headers
Limitations
- Lacks standard container metadata (EXIF, XMP, ICC profiles), meaning color space and orientation data must be handled externally or out-of-band
- Zero support in web browsers or standard consumer operating systems
- Often requires specialized broadcast hardware or custom software libraries to decode
JPEG-XS-Sequence
JPEG-XS-Sequence Strengths
- Provides sub-millisecond encoding and decoding latency across a video sequence while retaining visually lossless quality
- Leverages the robust ISOBMFF track structures for accurate frame timing, audio synchronization, and metadata handling
- Optimized for professional video production and IP broadcasting workflows
Limitations
- Zero web browser compatibility, limiting its use entirely to professional and industrial hardware workflows
- Compression ratios are significantly lower than consumer video codecs like HEVC or AV1
- Extremely niche format that requires highly specialized broadcast hardware or custom software libraries to process
When to choose which format
JPEG-XS-Codestream
Use JPEG-XS-Codestream when…
- Hardware Decoding Pipelines (FPGA/ASIC)
- Live Broadcast Infrastructure
- Video over IP Transport
- Embedded Camera Systems
JPEG-XS-Sequence
Use JPEG-XS-Sequence when…
- Live Broadcast Video Snippets
- Medical Imaging Sequences
- HDR Burst Photography Archiving
- Automotive & Drone Video Storage