import type { VideoRenderJob } from './types.js';
declare function processAlive(pid: number | undefined): boolean;
declare function readTail(filePath: string, maxBytes?: number): string;
export interface FfmpegPlan {
    args: string[];
    outputPath: string;
    subtitlePath?: string;
}
export declare function buildFfmpegPlan(projectDir: string, outputPath: string, jobId: string): FfmpegPlan;
export interface StartRenderInput {
    projectDir: string;
    outputFileName?: string;
    ffmpegPath?: string;
    overwriteOutput?: boolean;
}
declare function acquireOutputLock(lockPath: string, projectDir: string, jobId: string): void;
export declare function startRender(input: StartRenderInput): Promise<VideoRenderJob>;
export declare function getRenderJob(projectDir: string, jobId: string): VideoRenderJob & {
    logTail?: string;
};
declare function ffprobeFor(ffmpegPath?: string): string;
export declare function validateVideo(filePath: string, ffmpegPath?: string): Promise<{
    valid: boolean;
    format: unknown;
    streams: unknown[];
    issues: string[];
}>;
export declare const __testing: {
    ffprobeFor: typeof ffprobeFor;
    processAlive: typeof processAlive;
    acquireOutputLock: typeof acquireOutputLock;
    readTail: typeof readTail;
};
export {};