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catfinder5000-prekog

Overview

Overview of Prekog lambda

“Prekog” lambda script to:

  1. Do the timing reconciliation (start/end) in the Dynamo DB

  2. Put the media files and metadata in the S3 bucket (JSON format for easy representation)

Why I designed it this way

This is a seperate Lambda Function from the "parse" so that it can be run in parallel each time a Rekognition Label that we want to create a Live to VOD asset is desired. Since the time for the end of the archive probably hasn't happened yet, I needed to create a secondary Lambda to continue to poll the database until the event has been satisfied and we get our cat video.

Code Steps

  1. start of archive

    1. get 1 entry before in DynamoDB

    2. check to see if a "Cat" label exists

    3. check to see if scenechange confidence within threshold

    4. loop until those are met

    5. identify timestamp for start of archive

  2. end of archive

    1. get 1 entry after in DynamoDB

    2. check to see if a "Cat" label exists

    3. check to see if scenechange confidence within threshold

    4. loop until those are met

    5. identify timestamp for end of archive

  3. send XML with start/end times to Delta REST

  4. parse response to DyanamoDB table for website

Environment Variables

Mandatory

DELTA_URL

DELTA_CONTENTNAME

Optional

DYNAMO_MAIN = "catfinder5000-main"

DYNAMO_MAIN_GSI = "id_type-id_filename-index"

DYNAMO_LIST = "catfinder5000-list"

DYNAMO_SUMMARY = "catfinder5000-summary"