Slideshow / Powerpoint / Online meeting / Lecture Presets

Discuss encoding for devices and presets.
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Gunpowder
Posts: 6
Joined: Sat Jun 27, 2020 10:17 am

Slideshow / Powerpoint / Online meeting / Lecture Presets

Post by Gunpowder »

In these times its necessary to keep the online lectures small as possible, because there are so many of them when you study.
This is my first try and my 2 hours media was compressed to 170MB. I bet there is more to configure, buts thats ok for me. Just copy the code to editor and safe as .json file.

Code: Select all

{
  "PresetList": [
    {
      "AlignAVStart": true,
      "AudioCopyMask": [
        "copy:aac",
        "copy:ac3",
        "copy:dtshd",
        "copy:dts",
        "copy:mp3",
        "copy:truehd",
        "copy:flac",
        "copy:eac3"
      ],
      "AudioEncoderFallback": "ac3",
      "AudioLanguageList": [],
      "AudioList": [
        {
          "AudioBitrate": 160,
          "AudioCompressionLevel": 0.0,
          "AudioEncoder": "av_aac",
          "AudioMixdown": "stereo",
          "AudioNormalizeMixLevel": false,
          "AudioSamplerate": "auto",
          "AudioTrackQualityEnable": false,
          "AudioTrackQuality": -1.0,
          "AudioTrackGainSlider": 0.0,
          "AudioTrackDRCSlider": 0.0
        }
      ],
      "AudioSecondaryEncoderMode": true,
      "AudioTrackSelectionBehavior": "first",
      "ChapterMarkers": true,
      "ChildrenArray": [],
      "Default": false,
      "FileFormat": "mp4",
      "Folder": false,
      "FolderOpen": false,
      "Mp4HttpOptimize": false,
      "Mp4iPodCompatible": false,
      "PictureAutoCrop": true,
      "PictureBottomCrop": 26,
      "PictureLeftCrop": 0,
      "PictureRightCrop": 0,
      "PictureTopCrop": 0,
      "PictureDARWidth": 1280,
      "PictureDeblock": 4,
      "PictureDeinterlaceFilter": "decomb",
      "PictureCombDetectPreset": "default",
      "PictureCombDetectCustom": "",
      "PictureDeinterlacePreset": "default",
      "PictureDeinterlaceCustom": "",
      "PictureDenoiseCustom": "",
      "PictureDenoiseFilter": "off",
      "PictureDenoisePreset": "light",
      "PictureDenoiseTune": "none",
      "PictureSharpenCustom": "",
      "PictureSharpenFilter": "off",
      "PictureSharpenPreset": "medium",
      "PictureSharpenTune": "none",
      "PictureDetelecine": "off",
      "PictureDetelecineCustom": "",
      "PictureItuPAR": false,
      "PictureKeepRatio": true,
      "PictureLooseCrop": false,
      "PictureModulus": 2,
      "PicturePAR": "auto",
      "PicturePARWidth": 1,
      "PicturePARHeight": 1,
      "PictureRotate": "0:0",
      "PictureForceHeight": 0,
      "PictureForceWidth": 0,
      "PresetName": "Good Slide Show",
      "Type": 1,
      "UsesPictureFilters": false,
      "UsesPictureSettings": 2,
      "SubtitleAddCC": false,
      "SubtitleAddForeignAudioSearch": true,
      "SubtitleAddForeignAudioSubtitle": false,
      "SubtitleBurnBehavior": "foreign",
      "SubtitleBurnBDSub": false,
      "SubtitleBurnDVDSub": false,
      "SubtitleLanguageList": [],
      "SubtitleTrackSelectionBehavior": "none",
      "VideoAvgBitrate": 0,
      "VideoColorMatrixCode": 0,
      "VideoEncoder": "x264",
      "VideoFramerate": "30",
      "VideoFramerateMode": "pfr",
      "VideoGrayScale": false,
      "VideoScaler": "swscale",
      "VideoPreset": "fast",
      "VideoTune": "",
      "VideoProfile": "main",
      "VideoLevel": "4.0",
      "VideoOptionExtra": "",
      "VideoQualityType": 2,
      "VideoQualitySlider": 22.0,
      "VideoQSVDecode": false,
      "VideoQSVAsyncDepth": 4,
      "VideoTwoPass": true,
      "VideoTurboTwoPass": true,
      "x264Option": "--ref 1 --deblock 0:0 --partitions i4x4,i8x8,p8x8,b8x8 --me hex --subme 2 --psy-rd 1.00:0.00 --no-mixed-refs --merange 16 --trellis 0 --8x8dct --cqm flat --deadzone-inter 21 --deadzone-intra 11 --chroma-qp-offset 0 --threads 9 --lookahead-threads 3 --bframes 3 --b-pyramid normal --b-adapt 1 --b-bias 0 --direct spatial --weightp 1 --keyint 750 --min-keyint 25 --scenecut 40 --rc-lookahead 10 --crf 23.0 --qcomp 0.60 --qpmin 0 --qpmax 69 --qpstep 4 --vbv-maxrate 750 --vbv-bufsize 1500 --nal-hrd none --ipratio 1.40 --aq-mode 1:direct=auto",
      "x264UseAdvancedOptions": true
    }
  ],
  "VersionMajor": "34",
  "VersionMicro": "0",
  "VersionMinor": "0"
}
mduell
Veteran User
Posts: 7259
Joined: Sat Apr 21, 2007 8:54 pm

Re: Slideshow / Powerpoint / Online meeting / Lecture Presets

Post by mduell »

Why not use the stillimage tune instead of the long pile of crap you have?
Gunpowder
Posts: 6
Joined: Sat Jun 27, 2020 10:17 am

Re: Slideshow / Powerpoint / Online meeting / Lecture Presets

Post by Gunpowder »

mduell wrote: Sat Jun 27, 2020 9:04 pm Why not use the stillimage tune instead of the long pile of crap you have?
Well, because its crap and the filesize is 3 times bigger than my results.
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BradleyS
Moderator
Posts: 1859
Joined: Thu Aug 09, 2007 12:16 pm

Re: Slideshow / Powerpoint / Online meeting / Lecture Presets

Post by BradleyS »

Not exactly specifying the options correctly, either. option1=foo:option2=bar etc.

For a lecture you can probably use mono audio and half the audio bit rate.
Gunpowder
Posts: 6
Joined: Sat Jun 27, 2020 10:17 am

Re: Slideshow / Powerpoint / Online meeting / Lecture Presets

Post by Gunpowder »

Could you post the best presets in your opinion, without half the audio bit rate? Would like to try em out and compare.
musicvid
Veteran User
Posts: 3761
Joined: Sat Jun 27, 2009 1:19 am

Re: Slideshow / Powerpoint / Online meeting / Lecture Presets

Post by musicvid »

You can cut your video frame rate in half without much impact, assuming you are filming talking heads.
It's what many cellphones and webcams do.
Gunpowder
Posts: 6
Joined: Sat Jun 27, 2020 10:17 am

Re: Slideshow / Powerpoint / Online meeting / Lecture Presets

Post by Gunpowder »

I dont like to half the frame rate, when the frames are basicly always the same. The right presets should do the thing, but it seems nobody knows how to do this.
musicvid
Veteran User
Posts: 3761
Joined: Sat Jun 27, 2009 1:19 am

Re: Slideshow / Powerpoint / Online meeting / Lecture Presets

Post by musicvid »

Actually, we do know how to do this. You can:
1. Reduce the Audio and/or Video Bitrate directly
2. Raise the Audio and/or Video compression factor
3. Reduce the Video Resolution or number of Audio channels
4. Reduce the Frame Rate
5. Reduce the color bit depth or chroma subsampling

Good luck!
mduell
Veteran User
Posts: 7259
Joined: Sat Apr 21, 2007 8:54 pm

Re: Slideshow / Powerpoint / Online meeting / Lecture Presets

Post by mduell »

Also
6. Apply an appropriate video encoder tune.
musicvid
Veteran User
Posts: 3761
Joined: Sat Jun 27, 2009 1:19 am

Re: Slideshow / Powerpoint / Online meeting / Lecture Presets

Post by musicvid »

Also, (thx for reminder)
7. Add a light denoise filter. Judiciously.
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