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Managed Services for Video Encoding and Chunking

1. AWS Elemental MediaConvert

AWS MediaConvert provides a managed solution for:

  • Transcoding videos into multiple resolutions (360p, 480p, 720p, 1080p)
  • Creating HLS/DASH outputs (chunks + playlists)
  • Generating thumbnails
  • Watermarking, DRM, and more

How It Works

(i) Upload the original video to an S3 bucket.

(ii) Create a MediaConvert job with:

  • Input S3 URL
  • Output S3 path
  • Output group: HLS (or DASH)

(iii) AWS automatically:

  • Transcodes into different resolutions
  • Chunks into .ts files
  • Generates .m3u8 playlists

(iv) Host output on CloudFront or another CDN.

2. Example Workflow with AWS MediaConvert

Step 1: Upload Video to S3

Example path:
s3://my-video-bucket/uploads/video123.mp4

Step 2: Create MediaConvert Job

Use the AWS Console or AWS SDK/CLI.
Specify an HLS output group and multiple resolutions:

  • 1080p → 5000 kbps
  • 720p → 3000 kbps
  • 480p → 1500 kbps
  • 360p → 800 kbps

Step 3: Output Folder Structure (Example)

s3://my-video-bucket/outputs/video123/
├── 360p/
│   ├── segment0.ts
│   └── 360p.m3u8
├── 720p/
│   └── ...
├── master.m3u8   ← adaptive HLS playlist

Step 4: Serve via CloudFront or S3 (Public)

Embed using HTML:

<source
  src="https://cdn.myvideos.com/video123/master.m3u8"
  type="application/x-mpegURL"
/>

Workflow Diagram

flowchart TD
    A[User Uploads
     ─ Full Video File] --> B[Transcoding
      ─ Multiple Res ]
    B --> C[Chunking
     ─ 4–6 sec segments ]
    C --> D[Store in S3/Blob/CDN
 - /video123/1080p
 - /video123/720p
 - /video123/master.m3u8 ]
    D --> E[ User Plays in Browser
     ─ using HLS/DASH Player ]
  • Chunks are fetched live as needed (Adaptive Bitrate)

What AWS Elemental MediaConvert Does

When you provide MediaConvert with a video file (like MP4), it:

  1. Transcodes the Video

  2. Converts to multiple resolutions (240p, 360p, 480p, 720p, 1080p, etc.)

  3. Compresses using codecs like H.264 or H.265

  4. Splits into Chunks

  5. Breaks each resolution into small segments (e.g. 6-second .ts files for HLS or .m4s for DASH)

  6. Generates Playlist Files

  7. For HLS: creates .m3u8 master + variant playlists

  8. For DASH: creates .mpd manifest

  9. Stores All Files in S3

  10. Segments and playlists are stored in your chosen S3 bucket