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MD at a glance
MD
Markdown was created in 2004 by John Gruber with Aaron Swartz, but the later CommonMark effort became important because the original syntax description was too ambiguous to keep implementations aligned.
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 | MD | PMD |
|---|---|---|
| File type | Document | Video |
| Extensions |
|
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| MIME type |
|
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| Created year | 2004 | 2004 |
| Inventor | John Gruber and Aaron Swartz | Sony |
| Status | active | legacy |
| Primary use cases |
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When to use each format
When to use MD
- Your source file is already in MD.
- Preserve source expectations before exporting to PMD.
- MD is commonly used in document 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 MD 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 MD to PMD?
This conversion changes how the format behaves in downstream tools and delivery environments.
What should I review after converting MD to PMD?
Validate output quality on representative files and confirm the target format behaves correctly in the destination workflow.