/**
 * Emit the reduced still-picture sequence header used by the pure TypeScript
 * encoder. The profile is 8-bit 4:2:0 with full-range BT.709/sRGB signaling.
 */
export declare function encodeSequenceHeader(width: number, height: number): Uint8Array;
/** Emit the uncompressed KEY_FRAME header for a single 64x64-superblock tile. */
export declare function encodeFrameHeader(width: number, height: number, baseQIdx: number): Uint8Array;