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25 lines
858 B
Markdown
25 lines
858 B
Markdown
---
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status: draft
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date: 2026-05-20
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definition: technical
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---
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# HEVC variant selection
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Select HEVC variants only when the browser and active media pipeline can decode them, while retaining AVC fallback.
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## Proposed direction
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- Filter by codec capability before applying quality policy.
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- Prefer HEVC only through explicit policy or a measured efficiency advantage.
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- Reuse normal video-track switching when codec transitions are supported.
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- Retain a playable AVC path for devices with incomplete HEVC support.
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## Before implementation
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Define codec-string normalization, platform exceptions, changeType requirements, and preference policy. Test HEVC-only, mixed HEVC/AVC, false-positive capability results, and midstream fallback.
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## Related
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[Capability probing](./capability-probing.md) and [rendition selection caps](./rendition-selection-caps.md).
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