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Improved

Slicer Release 260604.03.01

June 30th, 2026

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Changes since 260210.02.01-master slicer release

Fixes

  • Allow -breaks for VOD Slicer.
  • Attempt to detect and prevent excess audio buildup.
  • Fix Slicer websocket connection to local broker, use_brokers=3.
  • Fix -dasher timed metadata output (ID3 tags) in .ts slices.
  • Fix a use_brokers=3,4 slicing schedule and slicing commands regression introduced in the 240603.02.01 Slicer release.
  • Drop overlay image bug if it's missing the alpha channel data.
  • Fix input file timecode generation.
  • Drop boundary break metadata after it is consumed.

Enables

  • Content mixing (double box, squeeze back) boundary effect breaks via the /boundary Slicer API.
  • Automated periodic boundary effect breaks via the /periodic_breaks or /carousel Slicer APIs.
  • Support for boundary effects with the no_duration flag.
  • Cancellation of current or pending boundary effects by ssai_id in the /remove_break API payload.
  • Support for libpython 3.14 and 3.15.

Other changes

  • Live Slicer file mode improvements.
  • Set H264 VUI sample aspect ratio parameters.
  • Reduce default audioBlankSamplesDelay to 2 seconds and increase guesstimating limit to 1200 frames.
  • Always use -encwait; reduce grace period to 5 minutes for VOD and 1 minute for Live.
  • Make -cc1_desc work with -render_608 cc1.
  • Move preview and livepreview downstream from content mixer.
  • Re-enable explicit static gain adjustment for Dolby audio.
  • Add current_effect to /status response.
  • Increase Live Slicer configuration file line length limit to 4096 bytes per line.
  • Logging improvements.
  • Add /restart_log Slicer API endpoint.
  • Add /transcribe_start and /transcribe_stop Slicer API endpoints.
  • Add audio_transcription to Slicer status.
  • Build system updated to Ubuntu 20.04. As a result, NVENC and Whisper AI require NVIDIA driver version 460 or newer.

Known issues

Apple M-series Slicer build (mac_arm64) does not support Dolby AC3/EC3 encoding, or Nielsen options.

Prerequisites

  • This Slicer release was built on Ubuntu 20.04 and therefore requires glibc 2.31 or newer.

  • NVIDIA driver 460 or later is required for:

    • HEVC 4K HDR/SDR.
    • Whisper AI transcription.

  • Mac intel build:

sudo xattr -d -r com.apple.quarantine uplynk_slicer_mac_64-260604.03.01-master
  • Mac arm64 build:
sudo xattr -d -r com.apple.quarantine uplynk_slicer_mac_arm64-260604.03.01-master