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Image MIME Reference
JPEG-XS-Sequence

JPEG XS Image Sequence (HEIF Container)

image/jxss
VS

Valve Texture Format

image/vnd.valve.source.texture
VTF

A complete technical comparison of JPEG XS Image Sequence (HEIF Container) and Valve Texture Format — covering compression, feature support, browser compatibility, magic bytes, and when to choose each format.

Equal browser support

Feature Support

Feature JPEG-XS-Sequence VTF
Transparency (Alpha) Yes Yes
Animation Support Yes Yes
Progressive Loading ✕ No ✕ No
HDR Support Yes Yes
EXIF Metadata Yes ✕ No
ICC Color Profile Yes ✕ No
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
Full JPEG-XS-Sequence reference →
Valve Texture Format
image/vnd.valve.source.texture
Extension
.vtf
Container Valve Texture Format Header
Compression DXTC (DXT1, DXT3, DXT5) / Uncompressed (BGRA8888, RGB888, etc.)
Algorithm
DXT1-DXT5None
Color Depth 8-bit, 24-bit (RGB), 32-bit (RGBA), 16-bit Floating Point (HDR)
Developed by Valve Corporation
Released 2004
Magic Bytes
56 54 46 00
Full VTF reference →

Browser Support Comparison

Browser JPEG-XS-Sequence VTF
Chrome Chrome
✕ ✕
Firefox Firefox
✕ ✕
Safari Safari
✕ ✕
Edge Edge
✕ ✕
IE IE (Legacy)
✕ ✕
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
VTF

VTF Strengths

  • Extremely fast loading within the Source Engine because the block-compressed data goes directly into the GPU's VRAM without CPU decompression overhead
  • Bundles mipmaps, volumetric slices, cubemap faces, and animation frames entirely within a single file
  • Openly documented by the Valve Developer Community, leading to a massive ecosystem of third-party modding tools
Limitations
  • Strictly tied to the Source Engine ecosystem; entirely useless in standard web or print contexts
  • No native support in standard image editors without hunting down and installing specialized plugins
  • Block compression algorithms (DXT) are lossy and can cause visible artifacting, especially on normal maps or smooth gradients

When to choose which format

JPEG-XS-Sequence
Use JPEG-XS-Sequence when…
  • Live Broadcast Video Snippets
  • Medical Imaging Sequences
  • HDR Burst Photography Archiving
  • Automotive & Drone Video Storage
VTF
Use VTF when…
  • Source Engine Game Textures
  • Custom Maps and Modding (Garry's Mod, CS:GO)
  • Animated In-Game Decals and Sprays
  • Environment Cubemaps (Skyboxes)

More comparisons

JPEG-XS-Sequence vs ACES → VTF vs ACES → JPEG-XS-Sequence vs APNG → VTF vs APNG → JPEG-XS-Sequence vs AVCI → VTF vs AVCI → JPEG-XS-Sequence vs AVCS → VTF vs AVCS → JPEG-XS-Sequence vs AVIF → VTF vs AVIF → All comparisons →
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