Encoder Version 4.0.8 Release Notes

Updated March 11, 2026 17:30

AI-Media released Alta TS Encoder v4.0.8 on November 21, 2025. This update includes improvements and resolves issues for these components:

Multiplexer

This release doubles the input buffer size to account for bursty input, input rate variation and GOP (Group of Pictures) size fluctuation.
We have added buffers that use high-performance, lock-free substitutes to avoid deadlocks or overfilling when the above input cases occur.
Alta TS now includes processes for the graceful handling of elementary stream (ES) sync scenarios. Specifically, ES process ID (PID) streams (i.e. audio) no longer clock multiplexer buffers when their presentation timestamp (PTS) values fall behind the program clock reference (PCR).

SRT Output as Listener now handles multiple caller connections when sending data.
We have made general improvements for the overall stability of transport streams using SRT.
This release includes improved logging for error detection.

This release corrects an issue that caused duplicate substitutions and occasional dropped words in caption output.

This version resolves an issue where rapidly disconnecting and reconnecting causes the Alta instance to crash.
A previous issue that caused socket deadlocking and required users to restart the Alta instance has been resolved.
An issue with filled internal buffers preventing output from being sent, and requiring the Alta instance to be restarted, no longer occurs.
SRT Input as Caller now attempts to reconnect and no longer requires users to restart their Alta instance. This resolves an issue where, if the connection fails when the Alta instance is starting, the system retries automatically.
SRT Output as Caller now attempts to reconnect and no longer requires users to restart Alta instance. This resolves an issue where, if the connection fails when the Alta instance is starting, the system retries automatically.

This update is intended for systems running version 4.00 or higher. If your system is running an earlier version and you encounter any problems during the upgrade process, submit a case to AI-Media's support team.
This upgrade is distributed asa .deb file of approximately 45 MB. Be sure your workstation has enough free space before you download the update file.
The upgrade process takes approximately 10 minutes to complete, and stops all running Alta channels. Be sure to schedule this update for a time that is suitable for your company.
Do not navigate away from the System Update page until the entire update is complete. If you navigate away from the update page, you will need to restart the update process.

To upgrade your TS to version 4.0.8:

Complete the AI-Media Product Update Request form (opens in a new window). Be sure to select the specific Alta package types that you need for your site. Our Sales or Support teams will contact you and provide you with the necessary update files.
Follow the instructions you receive from AI-Media and download the upgrade files to a workstation on your network.
Log into your Alta Web Portal, and then click Update in the top tool bar.
On the System Update page, click Browse, and then navigate to the location on your computer where you downloaded the installation file.
Select the update file, and then click Upload on the System Update page.
Click Apply. The system processes the update.
Note: One the update starts, there is no way to cancel it.
Click Confirm on the success message. The system returns you to your Alta Channels page.
On the Alta Channels page, restart any Alta Channels that did not restart automatically.
Navigate to System > System Info from the top tool bar and confirm the Encoder version is Alta ts Encoder v4.08.