Blutrain
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Discovery and moderation at library scale.

Most catalogues have a long tail nobody has watched because nobody has been shown it — and metadata too thin for anyone to find it deliberately.

01 / What is hard here

The problem underneath the problem.

Recommendation in media has a strong feedback loop: the system promotes what performed, which is what was promoted. Left unexamined it narrows the catalogue, concentrates viewing on a small slice, and reports this as an improvement in engagement.

Moderation has the opposite problem. Volume makes human review impossible, automation makes context-dependent errors, and both over-removal and under-removal carry real cost — in a market with several languages, scripts and regional sensitivities in the same feed.

02 / What we build

Work we take on in media & entertainment.

Catalogue enrichment
Automatic tagging, scene and topic detection, subtitle alignment and metadata generation that makes the long tail findable at all.
Discovery and ranking
Two-stage recommendation with deliberate exploration budget and catalogue-coverage monitoring, so that the system does not quietly shrink your library.
Content moderation support
Multi-language classification with confidence thresholds, human review queues and a measured appeal path — designed as triage rather than replacement.
Audience analytics
Cohort behaviour, retention and content performance analysis at title and segment level.
Localisation workflow
Subtitle and dub pipeline support across Indian languages with human review at the quality gate.

03 / Constraints

What shapes the build.

These are design constraints agreed at the start, not compliance work bolted on before launch. Retrofitting them is expensive and usually incomplete.

Catalogue coverage
Monitored as a first-class metric. A recommender that only surfaces the top few hundred titles is making a merchandising decision nobody approved.
Rights and windowing
Availability, territory and licensing constraints applied as a hard layer above ranking, not learned from data.
Moderation appeals
Automated removals need a review route, and appeal outcomes feed back into evaluation rather than disappearing.
Regional context
Language, script and regional sensitivity vary enough that a single national moderation model will be wrong in predictable places.

04 / What we advise against

Where we would say no.

We would advise against fully automated content removal without an appeal path, and against optimising recommendation on engagement alone — it is the metric most reliably improved by making the product worse.

We would rather lose the work than build something that creates a liability for you or a harm for the people on the other side of it. If that rules out what you had in mind, it is better established now than at delivery.

Next step

Working in media & entertainment?

Tell us which process is slow, expensive or error-prone. The diagnostic will tell you whether this is a problem worth solving with machine learning — including if it is not.