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video_transcoding

TLDR

Create multiple versions of video content optimized for different use cases

Why Transcode?​

  • Device Compatibility: Different devices support different formats
  • Network Adaptation: Multiple bitrates for varying connection speeds
  • Storage Optimization: Smaller files for mobile users
  • User Experience: Smooth playback without buffering

Quality Ladder Strategy​

Original: 1080p @ 5000kbps (high quality source)
- 1080p @ 3000kbps (high-end devices)
- 720p @ 1500kbps (standard quality)
- 480p @ 800kbps (mobile/slow connections)
- 360p @ 400kbps (very slow connections)

Transcoding Timing​

Eager​

Transcode immediately after upload

  • Pro: Fast delivery, better user experience
  • Con: Higher storage costs, processing overhead

Lazy​

Transcode on first request

  • Pro: Lower storage costs, only popular content processed
  • Con: Slow first viewing experience

Smart​

Transcode based on predicted popularity

  • Pro: Balance of cost and performance
  • Con: Complex prediction logic needed

Format Considerations​

  • H.264: Universal compatibility (use this as baseline)
  • H.265/HEVC: Better compression, newer devices
  • AV1: Future codec, best compression
  • Container: MP4 for broad compatibility

References

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