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ICB at a glance
ICB
The Truevision line grew out of EPICenter-era PC graphics boards, and several board names ended up surviving as filename extensions even when the underlying raster structure stayed close to the wider TGA family.
M4S at a glance
M4S
CMAF emerged from industry convergence between Apple's fMP4 HLS initiative and DASH-IF fragmented MP4 requirements, producing a common segment format that both ecosystems could serve from a single encode.
Format comparison
| Feature | ICB | M4S |
|---|---|---|
| File type | Image | Video |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 1991 | 2012 |
| Inventor | Truevision | ISO/IEC (MPEG-DASH working group) |
| Status | active | active |
| Transparency | Not supported | Not supported |
| Animation | Not supported | Not supported |
| Primary use cases |
|
|
| Layer support | Not supported | Supported |
| Camera raw data | Not supported | Not supported |
| HDR support | Not supported | Not supported |
| Streaming ready | Not supported | Supported |
When to use each format
When to use ICB
- Your source file is already in ICB.
- Preserve source expectations before exporting to M4S.
- ICB is commonly used in image workflows.
When to use M4S
- Your target workflow expects M4S.
- Improve delivery compatibility with M4S.
- M4S is commonly used in video workflows.
FAQs
Why convert ICB to M4S?
Convert to M4S when packaging video for MPEG-DASH or CMAF delivery, where playback depends on many short media fragments rather than a single monolithic file.
It is the right target for adaptive streaming infrastructure, CDN-friendly segmented delivery, and modern VOD or live workflows built around fragmented ISO BMFF media.
What changes when converting ICB to M4S?
This conversion changes how the format behaves in downstream tools and delivery environments.
Moving to M4S adds layer support. Moving to M4S adds streaming delivery.
What should I review after converting ICB to M4S?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.