mh_PLAYer v2.12.1 — Release

mh_PLAYer v2.12.1 — Release Notes

High-Performance CGI/VFX Image Sequence & Video Player for Windows
Martin P. Heigan · anti-matter-3d.com/mhplayer

---

What's New in v2.12.1

v2.12.1 is a packaging and licensing update on top of the v2.12.0 feature
release (below).

Optional Windows installer — new

A signed, per-user Windows installer (mh_PLAYer_Win_x64_v2_12_1_Setup.exe)
now ships alongside the portable ZIP. No admin rights or UAC prompt — it
installs to your local app data, and its Select Additional Tasks page lets
you tick a Start Menu shortcut, a Desktop shortcut, and PATH integration (all
ticked by default). The portable ZIP remains available and unchanged.

Help → Install License… — new

Install a license without leaving the app: Help → Install License…, browse
to your signed license.dat, and mh_PLAYer validates and installs it for you,
then prompts you to relaunch — no manual file copying.

In-app documentation links

The Help menu now opens the Quick Start guide and CLI Cheat Sheet PDFs
directly, plus the Nuke Integration folder, alongside the User Manual and
License Agreement.

---

What's New in v2.12.0

Version 2.12 is a major feature release. It introduces a complete multi-clip
editing timeline, frame-accurate synchronised review across machines, and
Python plugin scripting — all built on the new Studio Pro license tier —
plus playlist interchange, drop-frame timecode, and a refreshed user manual.

---

EDL / Multi-Clip Timeline — new (Studio Pro)

Assemble multiple sequences and clips into a single ordered cut and review it
back-to-back, exactly as it will be conformed downstream.

• Per-clip In/Out trims, drag-to-reorder, and edge trim handles
• Non-modal EDL editor with a live playhead that tracks playback
• Loop playback, seamless next-clip pre-loading, and grade persistence across cuts
• CMX 3600 EDL import/export — round-trip with Premiere, Avid, Resolve, Final Cut
• Build a timeline directly from the Playlist (Send Playlist to Timeline)
• Headless render to movie or image sequence:

mh_player --convert cut.mhedl review.mp4
mh_player --convert cut.mhedl review.mov --display aces --burnin --codec prores

---

Synced Remote Review — new (Studio Pro)

Keep multiple mh_PLAYer instances on a LAN locked to the same frame, at full
quality.

• Frame-accurate playback synchronisation across machines
• Automatic session discovery — followers see a hosted session and join in one click
• Host-authoritative timing, bi-directional transport control, auth token, reconnect-on-drop

Distinct from the existing free browser Remote Review (open a frame in any
browser on the LAN), which remains available and unchanged.

---

Plugin Scripting — new (Studio Pro)

Extend the player with small Python plugins.

• Drop a .py file in the plugins/ folder; plugins load on startup
• Stable, versioned mh_player_api — state queries, playback control, status/log, and event hooks (on_frame_change, on_open_file, on_export_complete)
• Bundled example_plugin.py; full API reference in Appendix B of the manual

---

Playlist — reorder, trim & interchange

• Drag-to-reorder and per-shot In/Out trim, with trim badges in the list
• M3U / M3U8 import/export — VLC-compatible, with per-clip trim preserved
• One-click Send Playlist to Timeline (EDL)

---

Timecode, Colour & Audio

• Exact drop-frame timecode at 29.97 and 59.94 fps (SMPTE-correct), in the HUD, burn-in, and CMX 3600 export
• CDL grade (slope / offset / power) applied through a fast precomputed LUT
• Faster embedded-audio loading via a PyAV decode path
• Smoother seamless looping and a play-start warm gate that removes cold-start stutter

---

Interface

• Second quick-access icon row — Playlist, EDL, Onion-skin, Export, and Sync shortcuts
• Studio Pro tier badge and unified feature-locked messaging

---

Documentation

• New v2.12 User Manual (mh_PLAYer_v2_12_User_Manual.pdf, in the distribution root) — adds the EDL / Multi-Clip Timeline, Plugins, Studio Pro tier, an expanded CLI appendix, and a full Plugin API appendix
• Help → User Manual… opens it directly

---

Free vs Licensed Features

The core viewer, colour management, aspect ratio correction, stereo anaglyph,
browser remote review, the QC toolkit, and the full pipeline CLI remain free.
Paid licenses add the production workflow features; Studio Pro adds the
advanced collaboration and automation features.

Capability	Free	Individual	Studio	Studio Pro
Core viewer · colour · aspect ratio · stereo · browser remote review · QC · CLI	✓	✓	✓	✓
Annotations · A/B Compare · Playlist · Audio · Export · Slate & Burn-in	—	✓	✓	✓
EDL / Multi-Clip Timeline · Synced Remote Review · Plugin Scripting	—	—	—	✓
Licensed use across machines	—	Single (MAC)	Organisation-wide	Organisation-wide

Individual and Studio include the same feature set and differ only in
machine binding (single machine vs organisation-wide floating). Studio Pro
is the organisation-wide tier that also unlocks the EDL / Multi-Clip Timeline,
Synced Remote Review, and Plugin Scripting. All paid licenses are perpetual.

A 10-day full-feature trial (every feature, including Studio Pro) is available on request — no payment required.

---

Download

⬇ mh_PLAYer v2.12.1 — Windows x64 (portable ZIP)

A signed Windows installer (mh_PLAYer_Win_x64_v2_12_1_Setup.exe, per-user, no admin) is also available on the download page.

Verify your download against SHA256SUMS.txt before running. The exe is digitally signed.
Submitted to Microsoft WDSI and VirusTotal before release.

---

System Requirements

Windows 10 / 11 (64-bit) · 16 GB RAM minimum · SSD recommended for L3 cache

---

Upgrading from v2.8.x

Drop-in replacement — extract the new ZIP and run. Workspaces (.mhplay) and
license.dat are compatible. Individual and Studio licenses continue to work;
the new EDL, Synced Remote Review, and Plugin features require a Studio Pro
license (or an active Trial).

Need to install or update a license? Use Help → Install License… and select
your license.dat — no manual file copying.

---

Copyright © 2026 Martin P. Heigan. All Rights Reserved.
anti-matter-3d.com/mhplayer · anti-matter-3d.com/contact

mh_PLAYer_v2_8_21

mh_PLAYer v2.8.21 — Release

High-Performance CGI/VFX Image Sequence & Video Player for Windows
Martin P. Heigan · anti-matter-3d.com/mhplayer

---

Download

The ZIP is attached below under Assets.

Also available with release notes and licensing information at
anti-matter-3d.com/mhplayer

---

What's New in v2.8.21

Stereo / Anaglyph Viewer (free — no license required)

• View stereo pairs as anaglyphs directly in the player
• Two-sequence mode: load left and right eye sequences independently
• Single stereo EXR mode: auto-detects left/right layer pairs (11 naming conventions)
• Four presets: Red-Cyan Half-Color · Red-Cyan Greyscale · Amber-Blue · Green-Magenta
• Swap eyes and gamma-correct options

Headless Anaglyph Convert (free — CLI, no license required)

• --anaglyph flag for batch pipeline use — farm-safe, no display required
• Supports two-sequence and single stereo EXR input modes
• Combinable with --ar in a single pass

Aspect Ratio Correction (free — GUI + CLI, no license required)

• 13 presets from 1:1 to 4K Scope, selectable in transport bar or sidebar
• --ar RATIO CLI flag — bakes display geometry into all output formats
• Saved to preferences and workspace

HUD Shot Name Source

• Shot name in the HUD overlay can now be sourced from filename, parent folder, or custom text

---

Installation

1. Download mh_PLAYer_v2_8_21.zip
2. Extract to any folder — no installer, no admin rights required
3. Run mh_PLAYer_Win_x64_v2_8_21.exe
4. Use Help → Manage Shortcuts… to create Desktop and Start Menu shortcuts
5. Use Help → CLI PATH Setup… to add mh_PLAYer to your user PATH

---

Release Contents

mh_PLAYer_Win_x64_v2_8_21.exe       Main application (digitally signed)
ffmpeg\                             Bundled FFmpeg
mh_PLAYer_v2_8_User_Manual.pdf      Full user manual
mh_player_nuke.py                   Nuke flipbook integration script
License_Agreement.pdf               End User License Agreement
README.txt                          Plain-text quick reference
SHA256SUMS.txt                      SHA-256 checksums for all files
SHA256SUMS.yaml                     Machine-readable checksums
release_manifest.cat                Signed Windows catalogue
manifest.yaml                       Release manifest

---

Verifying Your Download

PowerShell:

Get-FileHash mh_PLAYer_Win_x64_v2_8_21.exe -Algorithm SHA256

Command Prompt:

certutil -hashfile mh_PLAYer_Win_x64_v2_8_21.exe SHA256

Compare the output against SHA256SUMS.txt. The exe is digitally signed and the distribution is submitted to Microsoft WDSI and VirusTotal before every release.

---

Licensing

mh_PLAYer is free to download and use. The core viewer, colour management, QC toolkit, stereo/anaglyph, aspect ratio correction, and pipeline CLI require no license.

A license unlocks production workflow features: Annotations, A/B Compare, Playlist, Audio import, Export Frames, Export Video, and Slate & Burn-in.

License	Binding	Expiry
Individual — $25	Single machine (MAC-bound)	Perpetual
Studio — $125	Any machine in organisation	Perpetual
Trial	Any machine	10 days — all features

Point release updates are free.

Purchase or request a trial: anti-matter-3d.com/mhplayer

---

Copyright © 2026 Martin P. Heigan. All Rights Reserved.
Governed by the End User License Agreement included in the distribution.

mh_PLAYer v2.12.0 — Release

mh_PLAYer v2.12.0 — Release Notes

High-Performance CGI/VFX Image Sequence & Video Player for Windows
Martin P. Heigan · anti-matter-3d.com/mhplayer

---

What's New in v2.12.0

Version 2.12 is a major feature release. It introduces a complete multi-clip
editing timeline, frame-accurate synchronised review across machines, and
Python plugin scripting — all built on the new Studio Pro license tier —
plus playlist interchange, drop-frame timecode, and a refreshed user manual.

---

EDL / Multi-Clip Timeline — new (Studio Pro)

Assemble multiple sequences and clips into a single ordered cut and review it
back-to-back, exactly as it will be conformed downstream.

• Per-clip In/Out trims, drag-to-reorder, and edge trim handles
• Non-modal EDL editor with a live playhead that tracks playback
• Loop playback, seamless next-clip pre-loading, and grade persistence across cuts
• CMX 3600 EDL import/export — round-trip with Premiere, Avid, Resolve, Final Cut
• Build a timeline directly from the Playlist (Send Playlist to Timeline)
• Headless render to movie or image sequence:

mh_player --convert cut.mhedl review.mp4
mh_player --convert cut.mhedl review.mov --display aces --burnin --codec prores

---

Synced Remote Review — new (Studio Pro)

Keep multiple mh_PLAYer instances on a LAN locked to the same frame, at full
quality.

• Frame-accurate playback synchronisation across machines
• Automatic session discovery — followers see a hosted session and join in one click
• Host-authoritative timing, bi-directional transport control, auth token, reconnect-on-drop

Distinct from the existing free browser Remote Review (open a frame in any
browser on the LAN), which remains available and unchanged.

---

Plugin Scripting — new (Studio Pro)

Extend the player with small Python plugins.

• Drop a .py file in the plugins/ folder; plugins load on startup
• Stable, versioned mh_player_api — state queries, playback control, status/log, and event hooks (on_frame_change, on_open_file, on_export_complete)
• Bundled example_plugin.py; full API reference in Appendix B of the manual

---

Playlist — reorder, trim & interchange

• Drag-to-reorder and per-shot In/Out trim, with trim badges in the list
• M3U / M3U8 import/export — VLC-compatible, with per-clip trim preserved
• One-click Send Playlist to Timeline (EDL)

---

Timecode, Colour & Audio

• Exact drop-frame timecode at 29.97 and 59.94 fps (SMPTE-correct), in the HUD, burn-in, and CMX 3600 export
• CDL grade (slope / offset / power) applied through a fast precomputed LUT
• Faster embedded-audio loading via a PyAV decode path
• Smoother seamless looping and a play-start warm gate that removes cold-start stutter

---

Interface

• Second quick-access icon row — Playlist, EDL, Onion-skin, Export, and Sync shortcuts
• Studio Pro tier badge and unified feature-locked messaging

---

Documentation

• New v2.12 User Manual (mh_PLAYer_v2_12_User_Manual.pdf, in the distribution root) — adds the EDL / Multi-Clip Timeline, Plugins, Studio Pro tier, an expanded CLI appendix, and a full Plugin API appendix
• Help → User Manual… opens it directly

---

Free vs Licensed Features

The core viewer, colour management, aspect ratio correction, stereo anaglyph,
browser remote review, the QC toolkit, and the full pipeline CLI remain free.
Paid licenses add the production workflow features; Studio Pro adds the
advanced collaboration and automation features.

Capability	Free	Individual	Studio	Studio Pro
Core viewer · colour · aspect ratio · stereo · browser remote review · QC · CLI	✓	✓	✓	✓
Annotations · A/B Compare · Playlist · Audio · Export · Slate & Burn-in	—	✓	✓	✓
EDL / Multi-Clip Timeline · Synced Remote Review · Plugin Scripting	—	—	—	✓
Licensed use across machines	—	Single (MAC)	Organisation-wide	Organisation-wide

Individual and Studio include the same feature set and differ only in
machine binding (single machine vs organisation-wide floating). Studio Pro
is the organisation-wide tier that also unlocks the EDL / Multi-Clip Timeline,
Synced Remote Review, and Plugin Scripting. All paid licenses are perpetual.

A 10-day full-feature trial (every feature, including Studio Pro) is available on request — no payment required.

---

Download

⬇ mh_PLAYer v2.12.0 — Windows x64

Verify your download against SHA256SUMS.txt before running. The exe is digitally signed.
Submitted to Microsoft WDSI and VirusTotal before release.

---

System Requirements

Windows 10 / 11 (64-bit) · 16 GB RAM minimum · SSD recommended for L3 cache

---

Upgrading from v2.8.x

Drop-in replacement — extract the new ZIP and run. Workspaces (.mhplay) and
license.dat are compatible. Individual and Studio licenses continue to work;
the new EDL, Synced Remote Review, and Plugin features require a Studio Pro
license (or an active Trial).

---

Copyright © 2026 Martin P. Heigan. All Rights Reserved.
anti-matter-3d.com/mhplayer · anti-matter-3d.com/contact