Improved MacOS Transcoding Forum Preview

Announcing the Improved MacOS Transcoding Forum Preview!

Changes Include:

  • Migrated some custom solutions to those maintained by upstream ffmpeg
  • Implemented support for decoding 12 bit videos
  • Implemented Hardware decoding of AV1 videos (m3 and newer only)
  • Implemented Hardware Tonemapping
  • Implemented Hardware burn in of Image based Subtitles (such as PGS)

Known Issues:

  • None (yet)

How it Works:

While this build does not have any new features, we have noticed performance boosts in certain scenarios as well as the previously mentioned bug fixes. The best way to help us test this upgrade is to install this forum preview build and then use plex as you normally would. While any issues you encounter are of interest we are primarily interested in achieving parity with the current version of the transcoder. Whenever possible please validate that any issue you encounter is not also an issue in the public or beta versions of PMS.

Before you proceed:

The server builds listed below are pre-alpha releases and have not been fully tested so we always advise caution. Make sure you have recent database backups and preferably run these builds independently from your main media server if possible and create new libraries to test pre-release software.
With that out the way…

Downloads (Updated 2026/06/08)

I haven’t tested AV1, 12-bit, etc content yet but I am able to test some H264 content. Playback generally looks good across a number of videos but I am seeing an issue with Skip Back. When hitting the Skip Back button on the web player, the time rewind is sometimes inconsistent (less than 10 seconds) and it eventually gets stuck on a timestamp it can’t skip back past.

I’ve attached videos showing the behavior from the latest prod release and the test release. It’s not obvious what I’m doing from the video but I’m just starting play and then clicking Skip Back repeatedly.

Mac mimi M4, Sequoia 15.7.7
Player: Web Player on Safari 26.5
Prod version: 1.43.2.10687
Test version: 1.43.3.10745

Prod:

Test:

https://stream.new/v/mNYYqE9vfiianxcC2rjfRC7Z8V01LOBsuNStUrKJDYR8

Can you please restart pms, reproduce, then send debug logs?