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    Interface X264Options

    Typed options for the libx264 encoder. All options derived directly from ffmpeg -h encoder=libx264 dump.

    interface X264Options {
        preset?:
            | "ultrafast"
            | "superfast"
            | "veryfast"
            | "faster"
            | "fast"
            | "medium"
            | "slow"
            | "slower"
            | "veryslow"
            | "placebo";
        tune?: | "film"
        | "animation"
        | "grain"
        | "stillimage"
        | "fastdecode"
        | "zerolatency";
        profile?: "baseline"
        | "main"
        | "high"
        | "high10"
        | "high422"
        | "high444";
        crf?: number;
        qp?: number;
        bFrames?: number;
        bPyramid?: "none" | "strict" | "normal";
        aqMode?: 0 | 1 | 2 | 3;
        aqStrength?: number;
        weightp?: 0 | 1 | 2;
        refs?: number;
        subq?: number;
        me?: "hex" | "dia" | "umh" | "esa" | "tesa";
        meRange?: number;
        trellis?: 0 | 1 | 2;
        deblock?: string;
        nalHrd?: "none" | "vbr" | "cbr";
        bitrate?: number;
        maxrate?: number;
        bufsize?: number;
        qpMin?: number;
        qpMax?: number;
        keyintMax?: number;
        keyintMin?: number;
        scenecutThreshold?: number;
        x264Params?: string;
        pixFmt?: PixelFormat;
    }
    Index

    Properties

    preset? tune? profile? crf? qp? bFrames? bPyramid? aqMode? aqStrength? weightp? refs? subq? me? meRange? trellis? deblock? nalHrd? bitrate? maxrate? bufsize? qpMin? qpMax? keyintMax? keyintMin? scenecutThreshold? x264Params? pixFmt?

    Properties

    preset?:
        | "ultrafast"
        | "superfast"
        | "veryfast"
        | "faster"
        | "fast"
        | "medium"
        | "slow"
        | "slower"
        | "veryslow"
        | "placebo"

    Encoding preset. Slower = better compression. Default: medium

    tune?:
        | "film"
        | "animation"
        | "grain"
        | "stillimage"
        | "fastdecode"
        | "zerolatency"

    Visual tune. Optimize for content type or special use case.

    profile?: "baseline" | "main" | "high" | "high10" | "high422" | "high444"

    H.264 profile

    crf?: number

    Constant Rate Factor, 0–51. Lower = better quality. Ignored if qp or bitrate set.

    qp?: number

    Constant QP mode, -1 means disabled. Overrides crf.

    bFrames?: number

    Number of B-frames, 0–16

    bPyramid?: "none" | "strict" | "normal"

    B-frame pyramid mode

    aqMode?: 0 | 1 | 2 | 3

    Adaptive quantization mode: 0=disabled, 1=VAQ, 2=auto-VAQ, 3=LADSAQ

    aqStrength?: number

    AQ strength, 0–3.0

    weightp?: 0 | 1 | 2

    Weighted prediction for P-frames: 0=none, 1=blind, 2=smart

    refs?: number

    Number of reference frames, 1–16

    subq?: number

    Subpel motion estimation quality, 1–11

    me?: "hex" | "dia" | "umh" | "esa" | "tesa"

    Motion estimation method

    meRange?: number

    ME range, 4–1000

    trellis?: 0 | 1 | 2

    Trellis quantization: 0=disabled, 1=final MB, 2=all MBs

    deblock?: string

    Deblocking filter parameters as "alpha:beta", e.g. "0:0"

    nalHrd?: "none" | "vbr" | "cbr"

    NAL HRD model for CBR/VBR signaling

    bitrate?: number

    Target video bitrate in kbps (VBV/ABR mode)

    maxrate?: number

    Maximum bitrate, kbps

    bufsize?: number

    Bufsize for VBV, kbps

    qpMin?: number

    Minimum QP

    qpMax?: number

    Maximum QP

    keyintMax?: number

    GOP size (keyframe interval)

    keyintMin?: number

    Min keyframe interval

    scenecutThreshold?: number

    Scene cut threshold, -1 to disable

    x264Params?: string

    Pass raw x264 option string, e.g. "ratetol=1.0:qcomp=0.7"

    pixFmt?: PixelFormat

    Forced pixel format

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