Overview

The node saves clips in mp4 format, along with the Pipeline metadata contained in those frames, as a files API object.
Files created by this node are also listed in the Console under the Deployment detail page when the save location is Lumeo cloud.

Format of output

This node creates 2 files for every clip it saves:

Media file (MP4 format), named <node_name>-YYYY-MM-DDThhmmss.usZ.mp4. Ex. clip1-2023-01-20T083909.952Z.mp4. The timestamp in the file name is the creation timestamp. This file contains the media for the clip in mp4 format.
Metadata file (JSON format) named <node_name>-YYYY-MM-DDThhmmss.usZ.mp4.json. Ex clip1-2023-01-20T083909.952Z.mp4.json. This file contains the metadata for all the frames contained in the media file in JSON format.

Inputs & Outputs

Inputs : 1, Media Format : Encoded Video
Outputs : 1, Media Format: Encoded Video
Output Metadata : None

Properties

Property	Value
`max_duration`	Maximum duration for the clip, in seconds. Once this duration is reached, a new clip will be started.
`prebuffer_interval`	Duration, in seconds, of video to record before the trigger condition is met. Note: See section below on how Pre-buffer works depending on the `trigger_mode` property.
`max_size`	Maximum size of a clip in bytes. Once this size is reached, a new clip will be started.
`location`	Where to save clips & associated metadata. Options : `local` : Save to local disk, in the folder specified under `path` property. `lumeo_cloud` : Upload to Lumeo's cloud service. For this location, Lumeo will always create a files object for each clip. `s3` : Upload to a custom S3 bucket.
`path`	Path to save the clips, if `location` == `local`. If you change the defaults, ensure that the path is writable by `lumeod` user. If location is set to `lumeo_cloud` clips are temporarily stored at `/var/lib/lumeo/clip_upload` (till they are uploaded).
`max_edge_files`	Maximum number of files to keep on local disk, when `location` == `local`, for this specific node. Ignored when `location` == `lumeo_cloud`. If this property is not set, Lumeo will continue to save till the disk fills up. If it is set, Lumeo will save to local disk in a round robin manner (overwrite the 1st file once `max_edge_files` have been written).
`trigger`	Start recording a clip once the trigger condition is met. The trigger expression must be a valid Dot-notation expression that operates on Pipeline Metadata and evaluates to `True` or `False`. See details here. ex. `nodes.annotate_line_counter1.lines.line1.total_objects_crossed_delta > 0`
`trigger_mode`	`Exact` : Record for as long as the trigger condition is met, but only up to the defined maximum duration. `Fixed Duration` : Record for the defined maximum duration once the trigger condition is met.
`s3_endpoint`	AWS S3-compatible endpoint to upload to. Used when `location` == `s3`. ex. `https://storage.googleapis.com` or `https://fra1.digitaloceanspaces.com`
`s3_region`	AWS S3-compatible endpoint Region. Used when `location` == `s3`. ex. `us` or `fra1`
`s3_bucket`	AWS S3-compatible bucket name. Used when `location` == `s3`. ex. `lumeo-data`
`s3_key_prefix`	Folder prefix within the AWS S3-compatible bucket that files will be created in. Used when `location` == `s3`. ex. `production/test`
`s3_access_key_id`	S3 API Key ID with write access to the specified bucket. Used when `location` == `s3`. ex. `GOOGVMQE4RCI3Z2CYI4HSFHJ`
`s3_secret_access_key`	S3 API Key with write access to the specified bucket.

Pre-buffer Interval

This diagram below explains how the pre-buffer interval changes how the video clip is recorded.

Metadata

Metadata Property	Description
None	None