Show per-display bitrate in dual output mode during streaming

[aleksandr-voitenko]

Note

This PR's target branch is mw_fix_btrt

Warning

This PR depends on streamlabs/obs-studio-node#1738

Motivation and Context

Desktop currently shows a single combined bitrate metric in Performance Metrics. That is confusing in dual output mode because horizontal and vertical outputs can have different bitrate behavior, and the combined value does not make it clear what each display is actually sending.

This also matters for Twitch Enhanced Broadcasting / Dual Format. obs-studio-node now exposes per-display enhanced broadcasting stats, so desktop can present the horizontal and vertical bitrate separately instead of relying only on an aggregate stream value.

Single-output streaming should keep the existing presentation.

Changes

• Added streaming performance stats helpers for aggregating active output instances.
• Added optional per-display bitrate/data-output aggregation for dual output mode.
• Uses Enhanced Broadcasting displayStats when available.
• Falls back to output context mapping for normal dual streaming across platforms.
• Keeps the existing combined bitrate metric when dual output mode is disabled.
• Updates Performance Metrics bandwidth display to H: <num> V: <num> in dual output mode.
• Added tests for streaming stats aggregation and Performance Metrics metadata.

[bundlemon]

BundleMon

Files added (4)

Status	Path	Size	Limits
✅	renderer.(hash).js	+7.79MB	-
✅	vendors~renderer.(hash).js	+4.67MB	-
✅	updater.js	+115.29KB	-
✅	guest-api.js	+40.23KB	-

Total files change +12.61MB

Final result: ✅

View report in BundleMon website ➡️

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Current branch size history