Madek Media Service

Prototyping

TODOs

Inspections

• Handle situations when an inspection gets lost

Building, Development & Testing this Project

Building

build: ./bin/uberjar.

Development

The Media-Service consists of several services like the server one or more inspectors etc.

Invoking ./bin/XYZ-run relinks .nrepl-port to the last started service!

Run the Server

./bin/server-run

Inspector

Run: ./bin/inspector-run

Config: ./bin/inspector-create-config

Data Management

Create some test files in the old store

FactoryGirl.create :research_video_media_entry,  responsible_user_id: '653bf621-45c8-4a23-a15e-b29036aa9b10'

Remove all media_files etc:

TRUNCATE TABLE media_files CASCADE;

Notes

Preview creation in V3

    THUMBNAILS = { maximum: nil,
                   x_large: { width: 1024, height: 768 },
                   large: { width: 620, height: 500 },
                   medium: { width: 300, height: 300 },
                   small_125: { width: 125, height: 125 },
                   small: { width: 100, height: 100 } }

• see create_previews! in datalayer/app/models/media_file.rb

• effective conversion see convert ind datalayer/lib/file_conversion.rb, uses the command convert from ImageMagic

S3 Upload via Browser

TLDR: pre-signed URLs seems likely to work for AWS and other implementations

https://docs.min.io/docs/upload-files-from-browser-using-pre-signed-urls.html

Meta Data Extraction with Exif

TLDR: seems to work, but not in every case, falls back to full download

• Does ExitTool stop processing a file (or stream) when it reaches the required data? i.e. if the metadata is in the header (or the first bit of the file) will it find it without having to read the whole file? Yes, if possible. See the -fast option.

https://exiftool.org/forum/index.php?topic=7579.0

https://exiftool.org/exiftool_pod.html#PIPING-EXAMPLES

curl -s http://a.domain.com/bigfile.jpg | exiftool -fast - Extract information from an image over the internet using the cURL utility. The -fast option prevents exiftool from scanning for trailer information, so only the meta information header is transferred.

SHA1 in the Browser

https://stackoverflow.com/questions/18586839/read-file-stream-using-javascript-in-web-browser?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa