export interface Mp4VideoTrackInfo {
    codec: string;
    label: string;
    contentType: string;
}
export interface Mp4VideoSample {
    offset: number;
    size: number;
    dts: number;
    cts: number;
    duration: number;
    isSync: boolean;
}
export interface Mp4vSoftwareTrack extends Mp4VideoTrackInfo {
    width: number;
    height: number;
    timescale: number;
    duration: number;
    decoderConfig: Uint8Array;
    samples: Mp4VideoSample[];
}
/**
 * Reads the declared video sample entry from an ISO BMFF/MP4 file.
 *
 * Browsers can accept the generic `video/mp4` container while silently
 * ignoring an unsupported video track. Inspecting `stsd` lets the renderer
 * distinguish that audio-only success from a genuinely decodable video.
 */
export declare const inspectMp4VideoTrack: (buffer: ArrayBuffer) => Mp4VideoTrackInfo | undefined;
/**
 * Extracts the minimal MP4V decode timeline needed by the Apache-2.0
 * PacketVideo software decoder. This intentionally avoids a general-purpose
 * media framework so the fallback stays small and offline-friendly.
 */
export declare const extractMp4vSoftwareTrack: (buffer: ArrayBuffer) => Mp4vSoftwareTrack | undefined;