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VFW_E_TOO_MANY_COLORS
Meaning
Windows documents VFW_E_TOO_MANY_COLORS as “Too many colors for the current display settings”. In practical terms, it is returned when the requested palette or indexed video format contains more colors than the current display configuration can support.
Likely causes
- Possible cause 1: palette entry count exceeds the selected display depth.
- Possible cause 2: format negotiation preserves a high-color palette for a restricted device mode.
- Possible cause 3: legacy overlay hardware exposes a smaller palette capacity.
Evidence to collect
- Capture 1: requested color count, bit depth and palette entries.
- Capture 2: display mode and renderer capability limits.
- Capture 3: media-type negotiation choices.
Correct handling and retry
- Corrective action 1: reduce or quantize the palette for the target mode.
- Corrective action 2: select a higher-color display mode when operationally acceptable.
- Corrective action 3: negotiate a true-color media subtype instead of indexed presentation.
Retry guidance. Retry after changing palette size, display mode or media type.
Difference from nearby HRESULTs
VFW_E_NO_PALETTE_AVAILABLE means no palette exists; it means one exists but exceeds the active display capacity.
Practical scenario
A remote session exposes an 8-bit-compatible legacy surface while the stream carries a larger indexed palette; renegotiating the format avoids it.
Official Microsoft references
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