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VFW_E_PALETTE_SET
Meaning
Windows documents VFW_E_PALETTE_SET as “Setting a color key would conflict with the palette already set”. In practical terms, it is returned when DirectShow refuses to set a color key because a palette is already configured and the two states conflict.
Where the failure belongs
This result belongs to DirectShow filter-graph processing. The relevant condition is that DirectShow refuses to set a color key because a palette is already configured and the two states conflict.
Evidence to collect
- Capture 1: current palette contents and owner.
- Capture 2: requested color-key type and value.
- Capture 3: order of overlay configuration calls.
Likely causes
- Possible cause 1: the application sets palette mode before color-key mode.
- Possible cause 2: reconnection preserves palette state unexpectedly.
- Possible cause 3: two components independently configure mutually exclusive overlay presentation options.
Diagnostic sequence
- Confirm that the observed path matches this condition: DirectShow refuses to set a color key because a palette is already configured and the two states conflict.
Practical scenario
A renderer receives a palette from media-type negotiation and later application code tries to set a destination key; selecting one mode resolves it.
Correct handling and retry
- Corrective action 1: choose one presentation strategy and clear the conflicting palette through the documented path.
- Corrective action 2: centralize overlay state ownership.
- Corrective action 3: reinitialize state after display or graph changes.
Retry guidance. Retry after removing the conflicting palette and verifying renderer support for a color key.
Difference from nearby HRESULTs
VFW_E_COLOR_KEY_SET is the inverse conflict: a key already exists when code attempts to set a palette.
Official Microsoft references
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