Background

Emerging markets in 'mobile video devices' such as dashcams, drones, body-worn video and smartphones are increasing consumer demand for geotagged video on the web and especially with access to moving objects, e.g. distance & speed for vehicles, and sensor data, e.g. heart rate for fitness users.

Web browser integration of timed video metadata enables users to easily access and share their data with the online community and makes geotagged videos accessible to web search engines in a common format. OGC Testbed-16 Full Motion Video to Moving Features task has highlighted benefits of exporting embedded (in-band) metadata to a separate, linked (out-of-band) file for web access using Web Video Map Tracks (WebVMT), including the need for a web API for moving objects & sensors.

Discussion

Key concepts include:

1. Data sync to synchronise timed metadata, including location, with video on the web;
2. Interpolation to represent intermediate values between sample points for sensors and locations;
3. Moving objects to determine distance, speed, etc. from a timed location sequence (trajectory);
4. 3D coordinates to (optionally) include height/altitude/elevation, though 2D should be the initial focus.

The aim is to draft a lightweight solution, so consideration should be given to:

1. Relevance with identified common use cases;
2. Flexibility to accommodate most use cases;
3. Simplicity to minimise design complexity & processing overheads;
4. Alignment with existing standards.

Participants are urged to join and contribute to the WebVMT Community Group (CG) where GitHub issues form focal points for the key issues to enable ideas to be shared and discussed before the TPAC meeting.

Objectives

The goal is to draft a justified list of properties for inclusion in a web API which is designed for accessing moving objects & sensors in a browser and suitable for 'mobile video devices.'

Participation

All participants should register for TPAC 2020.

Please add relevant comments to the following issues which will be used to capture feedback by Friday 23 October 2020:

• Data synchronisation with video;
• Data interpolation between samples;
• Data attributes for moving objects & sensors;

These issues will form the basis of discussion and the conclusions agreed at the breakout meeting in the week 26-30 October 2020.