Multi-Stem Recording
Record the composite feed, mixed audio, and every audio source to separate files — remix or strip copyrighted music in post without re-recording.
Multi-stem recording is how DualStream writes full sessions to disk. Instead of a single muxed video file, each session produces several synchronized files — a composite A/V per canvas, a mixed audio master, and one audio stem per source. Every file is Matroska (.mkv) and shares the same session timestamp.
Why Multi-Stem?
With a single mixed file you're locked into whatever levels you had during the stream. With stems, each audio source is a separate file you can load into any editor or DAW:
- Lower the game audio under commentary.
- Strip copyrighted music before uploading to YouTube.
- Boost a guest's mic that was too quiet.
- Pull the mixed-audio master for podcast episodes with no video at all.
Stems Produced
Every session writes the following files to its session directory:
| File | Stem Type | Contents |
|---|---|---|
stream_h.mkv | composite_av | Horizontal (16:9) composite — full video + master audio. |
stream_v.mkv | composite_av | Vertical (9:16) composite — full video + master audio. |
mixed_audio.mkv | mixed_audio | Audio-only master mix, no video. |
<source>.mkv per audio source | audio_stem | One file per mic / desktop / game / music / browser source. |
All stems share the same session clock, so they line up frame-for-frame when dropped onto a timeline.
VOD Track
The Exclude from VOD Track feature works alongside multi-stem recording. Audio sources marked as VOD-excluded are kept out of the stream's VOD audio track on platforms that support it, while still being recorded locally as their own stem — so copyrighted music never lands on Twitch VODs but stays available for your edit.
See Audio for details on configuring the VOD track.
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