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| MF_E_THINNING_UNSUPPORTED | MF_E_UNSUPPORTED_RATE_TRANSITION |
MF_E_REVERSE_UNSUPPORTED
MF_E_REVERSE_UNSUPPORTED means that a negative playback rate is not available. Many live sources and format pipelines cannot seek or decode frames backward in a way that supports reverse playback.
Choose a different feature path
- Query rate support before presenting a reverse-playback control.
- For a seekable file, an application may implement a separate frame-stepping or indexed-seek experience instead of relying on a negative rate.
- Do not present this as a network or decoder crash; it is a declared capability limit.
Keep the current playback state intact unless the API contract for the attempted rate change says otherwise.
Microsoft: IMFRateSupport::IsRateSupported · Microsoft: custom media source guidance
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