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evmux Knowledge Base

Recording

evmux provides two distinct recording methods: Local Recording (ISO) for capturing individual participant feeds, and Cloud Recording for capturing the complete composition.

Recording types

Local Recording (ISO Recording)

Isolated recording captures each participant’s feed independently on their own computer:

  • Per participant. Each speaker or guest records their own camera and microphone feed locally.
  • High quality, up to 4K. Each participant is recorded at their camera’s full resolution, up to 4K, with no streaming compression. This is the only way to get resolution higher than 1080p; the livestream and the cloud recording are both 1080p.
  • Saved in the browser first. Recordings are stored on the participant’s computer while the show runs.
  • Automatic upload. After recording, the files are uploaded to evmux in the background.
  • Producer access. The producer can download all participant ISO recordings after the broadcast.

How it works:

  1. When local recording starts, each participant’s browser records their own feed.
  2. The recording is saved on their computer in small pieces as the show runs.
  3. In the background, evmux keeps checking for finished pieces and uploads them.
  4. Uploads are done in a way that survives large files and interruptions.
  5. The producer downloads the ISO recordings from the dashboard.

Important: don’t close evmux until uploads finish. ISO recordings are saved on each participant’s own computer first, then uploaded to our servers in the background. Every participant should keep evmux open until their recording has finished uploading. If they close the tab or leave before the upload completes, the not-yet-uploaded video can be lost.

A local recording can contain video and audio or audio only.

Cloud Recording

Cloud recording captures the entire composition, the final mixed output:

  • Scene recording. Records exactly what viewers see: the composed scene with all layers.
  • 1080p. The composed output, both the livestream and this cloud recording, is 1080p. For higher resolution, use Local Recording (ISO) above.
  • Single output. One recording file containing the final mix.
  • Platform recording. Some streaming platforms also record automatically (YouTube VODs, Facebook videos, Twitch archives).

Use cases

ISO recording for post-production

ISO recordings enable professional post-production:

  • Multi-camera editing. Edit with multiple camera angles.
  • Quality preservation. Each feed is at full quality without network compression.
  • Audio separation. Separate audio tracks for each participant.
  • Backup. Independent recordings provide redundancy.

Cloud recording for quick sharing

Cloud recording provides immediate access:

  • Instant replay. View the recording right after the broadcast.
  • Platform integration. Automatic publishing on streaming platforms.
  • Viewer access. Viewers can watch what they missed.

Combined workflow

Professional broadcasters often use both:

  1. Cloud recording for immediate VOD availability.
  2. ISO recording for high-quality post-production edits.

Best practices

  1. Enable ISO recording for all participants to capture every feed.
  2. Leave free disk space. Browser storage is limited; long recordings need room.
  3. Monitor upload status. Check that recordings upload successfully after the broadcast.
  4. Download ISO recordings promptly. Cloud storage may have retention limits.
  5. Record video and audio unless bandwidth is critical.
  6. Test before important broadcasts. Verify recording works in your pre-show checks.