autoEdit 2 Documentation
1.0.13
1.0.13
  • Introduction
  • Overview
    • Intro
      • Development approach
      • from 1.0.5 to 1.0.6
    • Architecture Overview
      • Lo fi Design Sketches
      • High fidelity sketches in HTML
    • Support the project
    • documentation section template
    • Build / Deployment
      • Deployment/build for Mac OS X
      • Deployment / Build for Linux
      • Deployment / Build for Windows
      • Travis CI continuous build
        • previous travis setup
  • R&D Doc
    • About R&D doc section
    • Transcription & Media Processing
      • Transcription json
      • Transcriber
        • audio to video
        • STT sdks
          • IBM Watson STT
          • Gentle STT
          • Pocketsphinx
      • Video preview conversion
      • Read metadata
    • Hypertranscript
    • Selections, Annotations, Papercuts
      • Selections
      • Annotations
      • Tags
    • Paper-edit
      • Paper-edit json
      • search-filter
      • drag-and-drop
      • Preview Paper-edit video
    • Export
      • EDL export
      • XML export
      • mp4 export
  • Appendix
    • Dev configuration
    • Current db setup
    • EDL Format
    • Reusable components
    • Prerequisites
    • Testing
    • Updating automated documentation
    • ffmpeg and ffprobe in electron
    • Adding STT services
  • Appendix - Data structures
    • IBM Watson json specs
    • Gentle Json transcription specs
    • Pocketsphinx results
    • autoEdit transcription Json
  • QA List
    • QA Intro
  • Adobe Panel
    • autoEdit Adobe CEP Panel dev setup
      • Adobe Extensions HostList codes
    • autoEdit Adobe CEP Panel integration overview
    • Jsx functions for Adobe CEP autoEdit adobe Panel
    • Packaging and distributing Adobe CEP Extensions
      • Packaging signing Adobe CEP Panel in details
      • Submit to Adobe
  • Project Page
    • Build project page
    • Build/update demo front end page
  • Roadmap
    • Improvements
    • Roadmap
      • Paper-editing Roadmap
      • Extra Features Roadmap
      • Future Roadmap
        • Live video editing
        • Social Media Export
        • Translate transcriptions
        • Web app
          • Multi-user collaboration
        • Searchable Editable Archive
        • NLP insights
        • Slack/Chat bot integration
        • Interactive dev tool
        • Phone mms integration with twillio
        • B-roll computational photography
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On this page
  • Component/part description
  • Related projects
  • Implementations Options considered
  • Current implementation
  • What needs refactoring
  1. R&D Doc
  2. Transcription & Media Processing

Video preview conversion

Component/part description

Convert input video into lower res video preview. For hypertranscript view.

Uses ffmpeg. Fluent ffmpeg.

Related projects

NA

Implementations Options considered

initially converted to ogg video. Quality was very poor, so moved to webm.

Then in previous implementation using NWJS this needs to be webm coz mp4 not supported. Issue is making it cross browser compatible. webm not supported by safari and iOS.

Current implementation

However with the recent move to Electron, was able to refactor and add support for mp4.

ffmpeg command 

ffmpeg -i inputfile -vf "scale=-1:360" -c:v libx264 -preset ultrafast -crf 40 output.mp4

see component

What needs refactoring

Seems quiet fast now.

PreviousPocketsphinxNextRead metadata

Last updated 6 years ago

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