export declare type FFmpegToolchainExeWrapper = any;
export declare type FFmpegFileItem = {
    name: string;
    data: Uint8Array;
};
export declare type FFmpegConversionTargetInfo = {
    targetCodec: string;
    targetFiletypeExt: any;
    targetBitrateKbps: number;
};
export declare class FFmpegStdPipeBuffer {
}
export declare class FFmpegTool {
    ffmpeg: FFmpegToolchainExeWrapper;
    private _onStdErrPipeByte;
    private _onStdOutPipeByte;
    constructor(ffmpeg: FFmpegToolchainExeWrapper, _onStdErrPipeByte?: (newByte: number, bytesCount: number) => void, _onStdOutPipeByte?: (newByte: number, bytesCount: number) => void);
    /**
     * Slightly low-level method, better use a more convenient wrapper if it can fit your purpose.
     *
     * Usage example:
     *
     *  // notice the redundant inputfile pathname information passed here, reason why is somewhere
     *  // inside ffmpeg.s
     *  const args = ['-i', 'input.mp3', '-c:a', 'aac', '-b:a', '128k', 'output.mp4'];
     *  const outData = ffmpegWrapper.runWithOneInputFile(new Uint8Array(data), 'input.mp3', args);
     *
     * @param fileData
     * @param fileName
     * @param ffmpegArguments
     */
    runWithOneInputFile(inputFile: FFmpegFileItem, ffmpegArguments: string[]): FFmpegFileItem;
    /**
     * see https://www.ffmpeg.org/ffmpeg-codecs.html#Codec-Options
     * @param inputFileData
     * @param inputExtension
     * @param audioConfig
     * @param videoConfig
     * @param extraArgs
     */
    convertAVFile(inputFileData: Uint8Array, inputExtension: string, audioConfig: FFmpegConversionTargetInfo | null, videoConfig: FFmpegConversionTargetInfo | null, extraArgs?: string[]): Uint8Array;
    /**
     *
     * @param inputFileData
     * @param inputExtension without dot
     * @param targetCodec ffmpeg codec identifier, defaults to 'aac'
     * @param targetFiletypeExt without dot, defaults to 'mp4'
     */
    convertAudioFile(inputFileData: Uint8Array, inputExtension: string, targetCodec?: string, targetFiletypeExt?: string, targetBitrateKbps?: number): Uint8Array;
    getVersion(): Promise<string>;
}