🚀 MoTekLab Video Encoder 10.0.0 Released — Major Milestone: Lossless Passthrough, O(1) Memory Surgery & Theme Overhaul

We are thrilled to announce the official release of MoTekLab Video Encoder 10.0.0 — a landmark milestone release that re-architects our core video processing pipeline, introduces lossless video passthrough, eliminates RAM exhaustion on huge 4K files, adds deep bitrate analytics, and polishes the user interface with our brand-new theme and 1-click switcher.

Whether you run batch encodings on a Linux desktop or automate media pipelines via the headless CLI on a remote server, version 10.0.0 delivers unprecedented performance, reliability, and precision.

🌟 What's New in Version 10.0.0

1. ⚡ Lossless Video Stream Copy (FFmpeg Passthrough)

HandBrakeCLI has always been a pure transcoder and does not support video passthrough. In v10.0.0, we engineered an intelligent FFmpeg Backend Router:

• Instantaneous Remuxing: Convert containers between .mkv and .mp4 in 2–3 seconds without decoding or re-encoding video frames (-c:v copy).
• Audio-Only Transcoding: Keep original pristine video while transcoding audio (e.g. downmixing 7.1 DTS or 768k EAC3 to 192k AAC/Opus) or passing audio through.
• Dynamic UI State: Selecting *Copy (Passthrough)* automatically disables the RF quality slider (RF: N/A (Lossless Copy)) and displays an active passthrough indicator.
• Headless CLI: Available via vconv --encoder copy -i movie.mkv -f mp4.

2. 🔍 Enriched Media Telemetry & Bitrate Analysis

The media analyzer has been supercharged with deep stream probing:

• Bitrate Transparency: View exact video stream bitrates, MKV BPS tag bitrates, and overall container bitrates.
• Framerate & Color Depth: Immediate visibility of exact framerates (e.g. 23.976 fps, 60 fps) and bit depth (10-bit HDR/SDR vs 8-bit).
• Audio & Subtitle Breakdown: Channel configurations, sample rates (e.g. 48 kHz), audio bitrates, and subtitle formats (SRT, SubRip, mov_text).
• Themed UI Cards: Rendered in structured, color-coded HTML cards in the GUI (Analyze button) and detailed terminal telemetry (vconv -a).

3. 🛡️ Memory-Safe MP4 Atom Surgery ($O(1)$ RAM)

Previous versions loaded entire MP4 files into memory during iTunes ilst metadata and cover art injection. For 10GB–50GB 4K UHD movies, this risked triggering the Linux Out-Of-Memory (OOM) killer.

• Streaming Chunk Processing: Rewrote _binary_replace_ilst, _inject_ilst, and _apply_faststart to use streaming and in-place chunk updates. Peak memory usage remains minimal ($O(1)$) regardless of whether your video is 100 MB or 100 GB.
• 64-bit Atom Support: Full handling for large files where atom size requires 64-bit descriptors (size == 1).
• Atomic File Swapping: Metadata writes now commit through temporary files with fsync and os.replace, guaranteeing zero corruption even if power is lost mid-encode.

4. 💡 Pre-Flight Smart Efficiency Guard & Bloat Prevention

Have you ever re-encoded a 1GB HEVC movie only to find the output became 2GB?

• Automated Bloat Guard: Before encoding starts, MoTekLab Video Encoder analyzes source compression. If a file is already high-efficiency HEVC/AV1 and your target RF is $\le 28$, a live alert advises a higher RF (e.g. 30+) to avoid file expansion.
• Audio Bloat Audit: Warns when uncompressed or high-bitrate audio (such as EAC3 768k or DTS) is set to copy passthrough, suggesting AAC/Opus to save 300–700 MB.
• Size Delta Tracking: Files table status column now records the exact size difference (e.g. ✅ -320MB (-45%) or ⚠️ +106MB (+16%)).

5. 🎨 Fahhim Theming & 1-Click Toggle

• Top-Right Toggle: Easily switch between Fahhim Crimson Dark (☀️) and Fahhim Rosé Light (🌙) directly from the top toolbar.
• Modal Contrast Fix: Fixed stylesheet cascade specificity so dialogs and message boxes never inherit transparent backgrounds or dark-on-dark unreadable text in Light mode.

6. 🚀 Researched Optimal Quality & Size Presets

Three new state-of-the-art presets engineered for optimal visual quality per megabyte:

• av1_efficient: Modern SVT-AV1 10-bit (RF 27, Speed 6) achieving 25–35% smaller file sizes than HEVC with zero color banding.
• hevc_optimal: Film-tuned x265 10-bit (RF 25, Medium) with no-sao=1 (eliminates waxy faces) and aq-mode=3 (eliminates dark scene posterization).
• nvenc_optimal: Hardware accelerated NVIDIA GPU encoding (RF 25).

📜 Complete Historical Changelog by Version

To help users upgrading from earlier releases, here is the full progression of features and fixes leading up to 10.0.0:

Version 10.0.0 (October 2026 — Major Milestone)

• Added: Lossless Video Stream Copy mode via FFmpeg backend (-c:v copy).
• Added: Enriched Media Telemetry extracting container bitrates, stream bitrates, framerate, 10-bit depth, and sample rates.
• Added: Memory-safe $O(1)$ RAM MP4 metadata surgery and 64-bit atom support.
• Added: Smart Efficiency Guard with pre-flight bloat warnings and audio size advice.
• Added: 1-click top-right theme toggle between Crimson Dark and Rosé Light.
• Added: Optimal presets (av1_efficient, hevc_optimal, nvenc_optimal).
• Added: Full in-app Command Line Interface (CLI) Reference modal (Help -> CLI Reference).
• Added: Headless CLI --preset parity and non-clobbering defaults.
• Fixed: Modal dialog background transparency and light theme contrast cascade in ui/theme.py.
• Fixed: Light theme QGroupBox title masking border line glitch.
• Fixed: Queue execution clobbering file table and per-job custom settings.
• Security: Hardened directory permissions to 0700 and config/queue files to 0600.
• Security: In-place self-updater pre-verifies Debian package identity prior to pkexec.

Version 9.8.0 (October 2026)

• Added: Fahhim Theme Engine with Rosé Light, Crimson Dark, and live OS System follow.
• Added: Dynamic content-hugging settings panel width (_HugTabWidget).
• Fixed: 10-bit video sources with embedded cover art silently encoding as 8-bit AV1 (fixing black screen bug on VLC/VDPAU).
• Fixed: HandBrakeCLI exit 3 crash caused by x264-specific subme=9 in x265 commands (subme=7).
• Fixed: Wheel events silently altering comboboxes and sliders while scrolling.
• Fixed: Activity log cramped at 100px; wrapped left settings in scroll area.

Version 9.7.5 (October 2026)

• Fixed: QThread lifetime abort crash (qFatal) on rapid dialog refresh by introducing robust thread parking and lifetime management.

Version 9.7.4 (October 2026)

• Fixed: Upstream HandBrake CLI update detection (preventing invalid Flatpak installation attempts).

Version 9.7.3 (October 2026)

• Added: Responsive window sizing adapting to small laptop displays (1366x768 and 1024x600).
• Fixed: NVEncC binary detection and lowercase package parsing.

Version 9.7.2 (October 2026)

• Added: In-place self-update engine (Help -> Check for Updates -> Update & Restart) supporting .deb and .AppImage.
• Added: Single-version XDG Start Menu launcher integration honoring /opt/vconv.

Version 9.7.0 (October 2026)

• Added: Universal Hardware Capability Engine dynamically probing GPU AV1, HEVC, and NVEncC support.
• Added: 10-bit color depth preservation for modern HDR and high-fidelity video.

Version 9.6.1 (May 2026)

• Added: Programmatic Apple ilst metadata atom builder preserving tags and cover art when transcoding MKV to MP4.

Version 9.2.x (May 2026)

• Rebrand: Renamed to MoTekLab Video Encoder with modern glassmorphism interface.
• Added: Full Arabic RTL localization and UTF-8 subtitle charset handling.
• Added: Dual execution mode with PyQt6 GUI and headless CLI.

📥 Downloads & Installation

Option 1: Debian / Ubuntu / Linux Mint (.deb)

# Download the package from GitHub Releases
wget https://github.com/motaz-hefny/MoTekLab-vconv/releases/download/v10.0.0/vconv_10.0.0_all.deb

# Install package
sudo dpkg -i vconv_10.0.0_all.deb
sudo apt-get install -f   # Resolves any missing dependencies

Option 2: Standalone Portable AppImage

# Download AppImage
wget https://github.com/motaz-hefny/MoTekLab-vconv/releases/download/v10.0.0/vconv-10.0.0-x86_64.AppImage

# Make executable and launch
chmod +x vconv-10.0.0-x86_64.AppImage
./vconv-10.0.0-x86_64.AppImage

Option 3: In-App Self-Update

If you already have MoTekLab Video Encoder v9.7.2 or higher installed:

1. Open the application.

2. Go to Help → Check for Updates.

3. Click 🔄 Update & Restart to automatically download and install v10.0.0!

💬 Community Discussion & Feedback

We want to hear from you!

• Have you tried the new Lossless Copy mode or the AV1 High Efficiency preset?
• What performance or size differences are you observing with your video libraries?
• Are there specific codecs, hardware encoders, or features you would like to see in future releases?

Drop your comments, questions, and benchmark results below! 🚀