Hey Everyone! We worked hard on this release as we wanted it done before FOSDEM2026, since we'll be demoing our newest feature and wanted to make sure it is available immediately.

This release comes with the MistProcComposer, a tool to mix, match, create overlays, watermarks, failovers and sync streams within MistServer! We're quite proud of this feature and hope you'll enjoy it as well.

As always, the full changelog is available as well.

MistProcComposer

A new type of input process that can mix multiple raw streams together and (optionally) synchronize them. Create multiviews, failovers, picture-in-picture, overlays, and much more with ease! More details available at the documentation.

Behaviour change: Raw tracks now by default mask from viewers, but not processes

This is done to make sure the MistProcComposer can reach the raw tracks and it makes sense to use it for processing in general.

NOSESS environment option

You can now run MistServer binaries with the NOSESS environment option to disable the session system.

Added support for RTP with fragmented AAC audio packets.

No more warnings about using IPv4 on an IPv6 capable system

MistServer should now correctly bind the correct socket type without switching back all the time.

WS/MP4 now allows tracks 1.5s away from the most live track instead of 250ms.

WS/MP4 would refuse to load in anything futher than 250ms away from the most live track, this was a bit aggressive for some slower transcoding processes.

MistProcAV improvements

We've improved the stability for MistProcAV and added better hardware support for Nvidia. A bigger overhaul is still on the way, but it should provide a much more stable and low latency experience already.

RECORDING_END trigger/webhook would sometimes be 1 second off

The RECORDING_END trigger/webhook would sometimes be 1 second off in its naming sense when used with $second or $datetime when write access was slow. This has now been corrected.

Various other bugfixes & stability improvements

Fixed incorrect auto-detection for E-RTMP support at certain Black Magic Design devices

This caused RTMP to not work as the devices did not support E-RTMP, however this is now correctly recognized.