System Context — ODL Video Service
Generated 2026-06-24 17:02 UTC · c4gen dev
The widest view: ODL Video Service and every external actor and system it exchanges data with. Edges shown are curated and code-verified; raw graph-derived candidates are listed under Dependencies & Cycles.
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External systems & peers
| System | Role |
|---|---|
| Keycloak (SSO) | OAuth2/OIDC IdP (via social-auth-app-django) federating MIT Touchstone SAML; supplies user_groups claim. |
| MIT Touchstone | MIT institutional SAML IdP that Keycloak federates to for authentication. |
| AWS MediaConvert | Managed transcoder (via mitol-django-transcoding). Reads source from S3, writes HLS + MP4 + thumbnails to the transcode/thumbnail buckets, and notifies on completion. |
| CloudWatch / SNS | MediaConvert job-state-change events route through CloudWatch/EventBridge to SNS, which POSTs the job result to the OVS transcode-jobs webhook. |
| CloudFront CDN | Delivers private video (HLS/MP4), thumbnails, and subtitles via RSA-signed URLs; invalidated on retranscode and thumbnail replacement. |
| Dropbox | Source of uploaded videos; browser Chooser selects shared links that Celery streams server-side to S3. |
| YouTube Data API | Public videos in YOUTUBE-stream collections are uploaded to YouTube with captions; status polled back. |
| Mailgun | Transactional email — video status notifications to collection admins. |
| MITx Online Open edX | MITx Online / MIT Learn self-hosted Open edX (courses.learn.mit.edu). OVS registers transcoded video metadata into its edxval API (/api/val/v0/videos/) so videos play inside MIT Learn courses. |
| xPRO Open edX | xPRO self-hosted Open edX (courses.xpro.mit.edu). OVS publishes video metadata to its edxval API for xPRO course videos. OVS posts per-collection to every linked EdxEndpoint (DB-configured base_urls; also the residential MITx deployment, which is not mapped here). |
| Sentry | Error and performance monitoring. |
| MIT Learn | SOA discovery platform. Its Celery ETL pulls OVS public videos + transcripts daily to index them as learning resources (downstream consumer of the OVS public API). |