3.10 Feature release notes

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.

Bugfix 3.9.1 Release notes

Hey everyone, bugfix release 3.9.1 is now available. We've found a few things we wanted changed, but not enough to consider as a full release. If you want to know more we recommend looking at the full changelog.

Downloads can be found here.

Noteworthy Changes

Logout API call

There's a new API call to log out, which forces a clear of the authentication state of an API connection. This is necessary for browsers that can re-use previous connections even after log out

Track-ID based track selector

You can now use the track id (or pid) of a track within a stream. This works for video, audio and metadata. It can be done by adding an i# as selection. For example selecting the video track 256 you can use ?video=i256 for more information see track selectors.

Improvement EFPS / EFPKS

The effective frames per second and effective frames per kilo second have been improved to be caucluated over time rather than a single measure. This makes them far more accurate, though it can take up to 10 seconds before it's done measuring.

Metadata improvement

Stream health information now includes the track index and the (effective) frames per second.

Shared memory statistics in capabilities API call

Shared memory statistics are now available in the capabilities API call. Visible on the server stats page

Simulate live option is removed from the interface

This was an option that was never meant to be user-facing rather set automatically depending on the input used. Most notable playlist inputs, the option has been removed as it can cause unexpected/wrong behaviour if set wrongly.

Bugfix: JWK memory leak

There was a memory leak if JWKs were loaded from an URL. This has been patched.

Bugfix: DTSC memory leak

DTSC output could cause a minor memory leak when connections did not have enough bandwidth.

Bugfix: UDP API no longer respons to requests coming from its own listening port. This could sometimes happen and caused 100% CPU usage due to a loop.

Push statistics no longer accidentally pick up non-push SRT connections

Several other bugfixes and improvements.

Hey everyone!

Like every year, the MistServer team will be exhibiting at IBC2025!
If you're planning on attending, be sure to drop by and say hi.
We’ll be happy to share our latest updates, upcoming plans or even steal a few great ideas from you if you've got them.

Our booth can be found at 5.F43

Note: IBC will charge for tickets unless you use a customer code.
Feel free to use ours: IBC6310. You’ll need this near the end of the signup process.

Using the code will make entry free, but also forward the information you enter during signup to us. We will send you a single "thank you" email and then throw that data away.

Here are just a few of the things we’ll be showcasing:

Presentation: Building your own media pipeline powered by Open Source software

Speaker: Jaron Viëtor
Day: Sunday 14 Sep
Time: 12:45-13:00
Location: Hall 5 (5.A28)

Modular streaming platform powered by MistServer

Most streaming platforms lock you into their ecosystem. We do things differently and give you the keys.
MistServer is fully open source, and not only can you self-host your own platform, we actually recommend it.
Run and own everything yourself, yet be able to count on our team for support, advice and custom development.

Broadcast quality & encoding

MistServer has always focused on stream repackaging and internet distribution,
resulting in a robust server that supports nearly every streaming protocol.
However, one area we've been limited in is raw video signals and encoding.
That’s about to change. This year, we're introducing support for raw video signals such as SDI, NDI and (USB) webcams, along with encoding and decoding capabilities.
This means you can now build a complete studio-to-studio or studio-to-server contribution setup using just MistServer.

Updates & improvements

One of our most common questions: What’s new? Fortunately, our changelog has the details, but feel free to ask us in person anyway. We’re always happy to talk shop!

Hello everyone!

We will be returning to IBC this year as well This year you'll find at booth 5.F43. Joining us this year will be Sipradius, together we've made some exciting solutions we'll be proudly showing off.

So be sure to drop by if you want to see the last things we've been working on. Pick our brain about how to solve something, or simply drop by to steal our chocolates.

Hello everyone,

Traditionally MistServer had a PDF available as a manual, which contained great amounts of information. Perhaps a little too great as the PDF itself became bigger and bigger, and perhaps slightly too unwieldy.

We've decided to convert the manual to an online environment, allowing easier small edits and improving general usability.

We've reached a point where the majority of the documentation is now available and updated. So we're happy to start redirecting towards it. You can find it here. We've now started adapting some of the blog posts into How-to guides as well. Of course a proper search method will have to follow as well.

We will eventually put the documentation online in Github as well so users can easily suggest edits or request pages. Until we've reached that point feel free to email comments, suggestions or requests to info@mistserver.com.

No worries for the PDF lovers out there, we will update the PDF at our usual irregular schedule.