179 lines
8.3 KiB
Markdown
Executable File
179 lines
8.3 KiB
Markdown
Executable File
# OpenTranscode
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A single-file, batch transcoding GUI for Linux built with PySide6. Wraps **av1an** for chunk-parallel AV1/VP9/x265 encoding with a retro-futuristic MMD3 media console aesthetic.
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## Features
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- **Batch encoding** — Drop a source folder, pick settings, hit encode. Processes every matching file recursively.
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- **Three open codecs** — AV1 (SVT-AV1), VP9 (libvpx), x265 (HEVC) with per-codec preset selection.
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- **Config-driven profiles** — Codecs, audio, containers, and resolutions defined as dataclass tables — no nested if/else chains.
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- **av1an chunk-parallel encoding** — Scene-based chunking with multi-worker parallelism. Automatically detects `--chunk-method` support and scales workers to physical CPU cores minus one.
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- **Lossless intermediate pipeline** — Resolution changes use a lossless libx264 ultrafast CRF 0 pre-scale pass (yuv420p10le) with duration integrity verification before the final encode.
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- **Forced subtitle muxing** — Optional soft-subtitle remux post-encode. Prefers forced-disposition tracks. Container-aware: WebVTT for WebM, stream copy for MKV.
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- **Audio normalization** — Rotary volume knob (-20 dB to +6 dB gain).
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- **Real-time FFmpeg library probing** — Greys out audio codecs whose underlying FFmpeg libraries are missing.
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- **Distro-aware dependency management** — Auto-detects Arch, Debian/Ubuntu, Fedora/RHEL/Rocky/Alma, openSUSE, and NixOS. Installs packages, handles av1an version conflicts, and builds from source when repos are stale.
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- **Post-encode integrity checks** — Verifies output file size (≥ 5% of source) and duration (≥ 95% of source) before accepting. Failed outputs are deleted automatically.
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- **Batch delete with confirmation** — Single pre-flight prompt showing file count and total size. Sources deleted only after individual verification passes.
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- **Custom radio-knob widgets** — Retro rotary controls for CRF and audio normalization with snap-to-tick, glow indicators, and mouse/scroll interaction.
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- **MMD3 theme** — Brushed aluminum, amber/green LED displays, beveled metallic panels via QSS.
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## Requirements
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| Dependency | Minimum Version | Purpose |
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| Python | 3.12+ | Runtime |
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| PySide6 | 6.6+ | Qt6 GUI framework |
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| av1an | 0.4.0+ | Chunk-parallel encoder frontend |
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| FFmpeg | 5.0+ (with libsvtav1, libvpx, libx265, libopus, libvorbis, flac) | Encoding, probing, remuxing |
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| ffprobe | (bundled with FFmpeg) | Stream analysis and validation |
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| mkvtoolnix | any | MKV container support |
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| Rust/Cargo | latest stable | Building av1an from source (if repo version is stale) |
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### Per-Distro Package Lists
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**Arch / Manjaro / Endeavouros / Garuda / CachyOS:**
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`ffmpeg mkvtoolnix-cli nasm cython gcc cmake git ninja python-pip svt-av1 rav1e aom libvpx x265 libopus libvorbis flac`
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**Debian / Ubuntu / Linux Mint / Pop!_OS:**
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`ffmpeg av1an mkvtoolnix svt-av1 rav1e aom-tools libvpx-tools x265 nasm gcc cmake git cargo rustc`
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**Fedora:**
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`ffmpeg mkvtoolnix svt-av1 rav1e aom libvpx x265 nasm gcc cmake git ninja-build cargo rustc` (requires RPM Fusion)
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**RHEL / CentOS / Rocky / Alma:**
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Same as Fedora, plus `epel-release` and RPM Fusion.
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**openSUSE (Tumbleweed/Leap):**
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`ffmpeg av1an mkvtoolnix svt-av1 rav1e aom-tools libvpx-tools x265 nasm gcc cmake git ninja cargo rustc` (requires Packman repo)
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**NixOS:**
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Manual configuration required — see quickstart.
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> All distros: if the packaged av1an is below 0.4.0, the app automatically builds from git.
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## Install & Run
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```bash
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# Clone the repo
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git clone https://github.com/YOUR_USER/open-transcode.git
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cd open-transcode
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# Install Python dependency
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pip install PySide6
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# Run — dependency auto-install triggers on first launch
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python open-transcode-master.py
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```
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On first launch, if av1an or FFmpeg is missing, the app detects your distro and offers to install everything automatically (Arch, Debian, Fedora, openSUSE). NixOS users will see a config snippet to paste into their configuration.
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## Project Structure
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```
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open-transcode/
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├── open-transcode-master.py # Single-file application (~2800 lines)
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├── README.md # This file
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├── quickstart.md # Setup & first-encode walkthrough
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├── LICENSE # AGPL-3.0
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└── .gitignore # Python/Qt/OS artifacts
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```
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## How It Works
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### Encoding Pipeline
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```
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Source file
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│
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├─ ffprobe pre-validation (skip if no video stream or < 0.5s)
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│
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├─ [If resolution != Original]
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│ └─ Lossless pre-scale → {file}.scaled_tmp.mkv
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│ (libx264 ultrafast CRF 0, yuv420p10le, scale+pad filter)
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│ └─ Duration integrity check (≥ 95% of source)
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│
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├─ av1an encode (chunk-parallel, scene-based splitting)
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│ └─ Workers: physical_cores - 1
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│
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├─ Post-encode verification
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│ ├─ Size check: output ≥ 5% of source
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│ └─ Duration check: output ≥ 95% of source
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│
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├─ [If subtitle language selected]
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│ └─ Soft subtitle remux (forced track preferred)
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│ ├─ MKV: -c:s copy (any codec)
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│ └─ WebM: -c:s webvtt (container requirement)
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│
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└─ [If delete-source enabled]
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└─ Delete source (only after verification passes)
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```
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### Distro Auto-Detection
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On startup, reads `/etc/os-release` and matches against known distro families. Each family has:
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- Package manager and install command template
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- Extra binary search paths (e.g. `~/.cargo/bin` for Rust-built tools)
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- Distro-specific av1an encoder name quirks
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- A dedicated `*_prep_deps()` function with fine-grained package installation
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### Config-Driven Profiles
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All codec/container/audio/resolution options are defined as `@dataclass` tables:
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- `VIDEO_CODECS` — Label, av1an encoder name, CRF range, default CRF, params function, preset map
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- `AUDIO_PROFILES` — Label + FFmpeg parameter tokens
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- `CONTAINER_PROFILES` — Label + file extension
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- `RESOLUTION_PRESETS` — Label, category (standard/wide/ultrawide/original), dimensions
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- `SUBTITLE_OPTIONS` — Label + ISO 639-2 language code (or None)
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The UI indexes into these tables — zero conditional logic for profile selection.
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## Supported Input Formats
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Default: `.mp4 .mkv .avi .mov .ts .m4v .flv .wmv .webm .mpg .mpeg`
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Configurable at runtime via the FILTER field in the UI (comma-separated extensions).
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## Supported Output Formats
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| Container | Video Codecs | Audio Codecs | Subtitles |
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| MKV (.mkv) | AV1, VP9, x265 | Opus, Vorbis, FLAC | Any (stream copy) |
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| WebM (.webm) | AV1, VP9 | Opus, Vorbis, FLAC | WebVTT only |
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## UI Controls
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| Control | Type | Range / Options |
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| SOURCE / SINK | Path fields + browse | Any directory |
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| VIDEO | Combo | AV1 (SVT-AV1), VP9, x265 (HEVC) |
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| PRESET | Combo | 4 per codec (e.g. Slow/Medium/Fast/Faster) |
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| AUDIO | Combo | Opus 96k/128k/64k, Vorbis 128k/192k, FLAC |
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| CONTAINER | Combo | MKV, WebM |
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| RESOLUTION | Combo | Original, 720p–4K (16:9 / 21:9 / 32:9) |
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| SUBS | Combo | None, English (forced track preferred) |
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| CRF | Rotary knob | 18–52 (codec-dependent range) |
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| AUDIO NORM | Rotary knob | -20 dB to +6 dB (0 = off) |
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| DELETE SOURCE | Checkbox | Per-batch confirmation prompt |
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## Troubleshooting
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**av1an build fails:** Ensure Rust is installed (`rustup`) and you have ~2 GB of free disk space in `/tmp`. The build takes 5–15 minutes depending on hardware.
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**Codec greyed out:** The corresponding FFmpeg library is missing. Install it via your package manager or re-run the auto-prep.
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**"chunk-method not recognized":** Your av1an is below 0.4.0. The auto-prep should handle this by building from git. If it doesn't, manually remove the packaged av1an and rebuild.
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**WebM + non-WebVTT subtitles fail:** WebM only supports WebVTT subtitles. The app auto-converts during remux. If the source subtitle codec can't be converted, the mux is silently skipped.
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**Permission denied on av1an install:** The git build attempts `sudo cp` to `/usr/local/bin`. Ensure your user has sudo access, or manually copy the binary from `/tmp/av1an-build/target/release/av1an`.
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## License
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AGPL-3.0 — see [LICENSE](LICENSE). |