在流媒体视频分发这一块，很长一段时间里小丸工具箱都是唯一真神，因为它有一套极其深度优化的特调压制参数，可以把视频压制到一个惊人的低码率的同时，还能保留非常高的质量。
不做参数优化的情况下 Handbrake 对于这段视频只有 76 分
搜了 Handbrake 的很多教程，基本都是教界面怎么用，CRF 调多少，编码器选什么，最多就是把 Profile 调成 Slow ，Preset 调成 High 这种基础动作。
多数时候，一样的 CRF 获得的视频码率基本是一致的，但最终图像质量却有着天差地别，尤其是当我拍摄一段夕阳或者天空的场景时，能够很明显地看到 Handbrake 色彩断层比小丸更加严重。
所以琢磨了好一阵子，我终于把小丸的进阶 x264 参数复刻到了 Handbrake 上，使他们拥有一致的 vmaf 评分的同时，在 1080P 下还能获得 50%的编码速度提升：
这下终于能够在享受现代化的队列管理、灵活的音轨视频轨字幕轨映射的同时，还能获得和小丸一样的压制质量了。
参数
保存为 json ，预设→从文件导入
{
"PresetList": [
{
"AlignAVStart": true,
"AudioCopyMask": [],
"AudioEncoderFallback": "av_aac",
"AudioLanguageList": [
"any"
],
"AudioList": [
{
"AudioBitrate": 256,
"AudioCompressionLevel": 0,
"AudioEncoder": "av_aac",
"AudioMixdown": "stereo",
"AudioNormalizeMixLevel": false,
"AudioSamplerate": "auto",
"AudioTrackQualityEnable": false,
"AudioTrackQuality": -1,
"AudioTrackGainSlider": 0,
"AudioTrackDRCSlider": 0
}
],
"AudioSecondaryEncoderMode": true,
"AudioTrackSelectionBehavior": "all",
"ChapterMarkers": true,
"ChildrenArray": [],
"Default": true,
"FileFormat": "av_mp4",
"Folder": false,
"FolderOpen": false,
"Optimize": true,
"Mp4iPodCompatible": false,
"PictureCropMode": 0,
"PictureBottomCrop": 0,
"PictureLeftCrop": 0,
"PictureRightCrop": 0,
"PictureTopCrop": 0,
"PictureDARWidth": 1920,
"PictureDeblockPreset": "off",
"PictureDeblockTune": "medium",
"PictureDeblockCustom": "strength=strong:thresh=20:blocksize=8",
"PictureDeinterlaceFilter": "decomb",
"PictureCombDetectPreset": "default",
"PictureCombDetectCustom": "",
"PictureDeinterlacePreset": "default",
"PictureDeinterlaceCustom": "",
"PictureDenoiseCustom": "",
"PictureDenoiseFilter": "off",
"PictureSharpenCustom": "",
"PictureSharpenFilter": "off",
"PictureSharpenPreset": "medium",
"PictureSharpenTune": "none",
"PictureDetelecine": "off",
"PictureDetelecineCustom": "",
"PictureColorspacePreset": "off",
"PictureColorspaceCustom": "",
"PictureChromaSmoothPreset": "off",
"PictureChromaSmoothTune": "none",
"PictureChromaSmoothCustom": "",
"PictureItuPAR": false,
"PictureKeepRatio": true,
"PicturePAR": "auto",
"PicturePARWidth": 1,
"PicturePARHeight": 1,
"PictureWidth": 3840,
"PictureHeight": 2160,
"PictureUseMaximumSize": true,
"PictureAllowUpscaling": false,
"PictureForceHeight": 0,
"PictureForceWidth": 0,
"PicturePadMode": "none",
"PicturePadTop": 0,
"PicturePadBottom": 0,
"PicturePadLeft": 0,
"PicturePadRight": 0,
"PresetName": "1080P x264 xiaowan",
"Type": 1,
"SubtitleAddCC": false,
"SubtitleAddForeignAudioSearch": false,
"SubtitleAddForeignAudioSubtitle": false,
"SubtitleBurnBehavior": "none",
"SubtitleBurnBDSub": false,
"SubtitleBurnDVDSub": false,
"SubtitleLanguageList": [
"any"
],
"SubtitleTrackSelectionBehavior": "none",
"VideoAvgBitrate": 0,
"VideoColorMatrixCode": 0,
"VideoEncoder": "x264",
"VideoFramerateMode": "vfr",
"VideoGrayScale": false,
"VideoScaler": "swscale",
"VideoPreset": "slow",
"VideoTune": "",
"VideoProfile": "high",
"VideoLevel": "auto",
"VideoOptionExtra": "ref=4:bframes=3:me=umh:keyint=600:min-keyint=1:deblock=1,1:scenecut=60:qcomp=0.5:psy-rd=0.3,0:aq-mode=2:aq-strength=0.8",
"VideoQualityType": 2,
"VideoQualitySlider": 24,
"VideoMultiPass": true,
"VideoTurboMultiPass": true,
"x264UseAdvancedOptions": false,
"PresetDisabled": false,
"MetadataPassthrough": true
}
],
"VersionMajor": 56,
"VersionMicro": 0,
"VersionMinor": 0
}
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