/**
 * assembleStage — Stage 6 of `executeRenderJob`. Final mux + faststart.
 *
 * Skipped entirely for png-sequence (there's no container to mux; the
 * frames were copied directly to `outputPath` by `encodeStage`).
 *
 * When the composition has audio, runs `muxVideoWithAudio(videoOnlyPath,
 * audioOutputPath, outputPath)`. When it doesn't, runs
 * `applyFaststart(videoOnlyPath, outputPath)` to move the `moov` atom to
 * the front so the file plays from a partial download.
 *
 * Hard constraints preserved verbatim:
 *   - The "Assembling final video" `updateJobStatus` payload fires at
 *     90% at the start of the stage.
 *   - "Audio muxing failed: <err>" / "Faststart failed: <err>" throw
 *     verbatim on the respective `success: false` results.
 */
import type { ProgressCallback, RenderJob } from "../../renderOrchestrator.js";
export interface AssembleStageInput {
    job: RenderJob;
    /** Encoded video produced by `encodeStage` or `captureStreamingStage`. */
    videoOnlyPath: string;
    /** Mixed audio path (only read when `hasAudio` is true). */
    audioOutputPath: string;
    /** Final on-disk output. */
    outputPath: string;
    hasAudio: boolean;
    abortSignal: AbortSignal | undefined;
    assertNotAborted: () => void;
    onProgress?: ProgressCallback;
}
export interface AssembleStageResult {
    /** Wall-clock ms for the assemble phase. */
    assembleMs: number;
}
export declare function runAssembleStage(input: AssembleStageInput): Promise<AssembleStageResult>;
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