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EPUB at a glance
EPUB
EPUB grew out of the digital publishing standards ecosystem and later moved under W3C stewardship, reinforcing its identity as an open publishing format rather than a vendor-specific storefront file.
PMD at a glance
PMD
The .pmd extension appeared in Sony's prosumer and professional recording device output alongside other Sony-proprietary formats like MQV, serving as a companion metadata or media descriptor file.
Format comparison
| Feature | EPUB | PMD |
|---|---|---|
| File type | Ebook | Video |
| Extensions |
|
|
| MIME type |
|
|
| Created year | 2007 | 2004 |
| Inventor | IDPF / W3C | Sony |
| Status | active | legacy |
| Primary use cases |
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When to use each format
When to use EPUB
- Your source file is already in EPUB.
- Preserve source expectations before exporting to PMD.
- EPUB is commonly used in ebook workflows.
When to use PMD
- Your target workflow expects PMD.
- Improve delivery compatibility with PMD.
- PMD is commonly used in video workflows.
FAQs
Why convert EPUB to PMD?
Convert to PMD when maintaining compatibility with a Sony-centered production workflow, preserving source media from a professional ingest system, or migrating archived broadcast assets that were originally wrapped for structured editorial exchange.
What changes when converting EPUB to PMD?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting EPUB to PMD?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.