FrameRudiments

FrameRudiments renders Shorts, Canvas-style clips and full lyric visualisers from one traceable timeline. It is the offline Python renderer in the DanceFlow ecosystem.

It consolidates the shared Python/Pillow/FFmpeg mechanisms developed across the existing Gilt Trip, Blame Putin, Clay, Paper Dreams, Free Danny Tommo, Silly Sausage Britain and Moderate or Good renderers. Release-specific artwork, scene layouts and creative decisions belong in project files or Python scene hooks. Historical render scripts and approved outputs remain preserved.

Install and run

Python 3.11+ and FFmpeg with libx264/AAC are required. Install the package into its own virtual environment. Published packages use python -m pip install framerudiments; from a source checkout use python -m pip install .:

python -m pip install .
framerudiments --version
framerudiments demo demo --font /path/to/a/font.ttf
framerudiments plan demo/project.json --output demo-plan.json
framerudiments preflight demo/project.json --output preflight --ffmpeg /path/to/ffmpeg
framerudiments render demo/project.json --output render --ffmpeg /path/to/ffmpeg

Use a new output directory each time. --ffprobe overrides FFmpeg's sibling ffprobe. Environment alternatives are FRAMERUDIMENTS_FFMPEG and FRAMERUDIMENTS_FFPROBE. Fonts are explicit hashed inputs; no platform-specific font or FFmpeg location is hardcoded into the engine. The synthetic demo creates its own tone, sprite, LRC, CUE and four-dimensional recording.

Capabilities

• Portrait, landscape and square frame-addressed Pillow composition, at native constant 60 fps by default. Other frame rates require a recorded reason.
• Sample-addressed source excerpts and exact repetitions; no time-stretch, resampling, normalization or remix. The master is never changed. Short derivatives default to 120 ms quarter-sine endpoint fades; set audio.fade_seconds: 0 to preserve an approved raw seam. Visualisers and Canvas-style projects default to no fades. AAC encoding is lossy.
• One caption/cue ledger for actual raster transitions, JSON, SRT and ASS. Retains signed frame error, same-frame ordering, explicit clears, carry-in lyrics and repeat boundaries. Accepts UTF-8 LRC with offsets/multiple stamps and CD CUE INDEX 01 at 75 subframes/s. Section labels never become lyrics.
• Canonical lyric text comparison, exact input hashes, inert text, bounded text wrapping and fit-or-fail behavior. Optional previous/current/next captions and exact-text-associated lyric artwork (planes, tablets, signs, etc.).
• Native DanceRudiments catalogue sampling at integer pips; optional explicit interpolation of adjacent native samples for legacy compositor parity. Preserves the distinction between 64 pips/beat and 16 DanceMoves ticks/beat.
• Saved StemLab beat grids, accepted stemlab.loops.v1 selections, explicitly selected stemlab.dancerudiments.candidates.v1 matches, and native dancerudiments.recording files. No model execution or copied DSP. Match-window extrapolation needs an explicit choice. N-dimensional recordings retain their own source clock and never wrap outside capture.
• Transparent sprites, atlas cycles in musical ticks, cue/time-gated layers, position/rotation/scale mappings with selectable axes, same-pose directional trails, masks, background contain/cover and N-dimensional signed bars. Independent composite motion channels preserve separate bounce/sway/tilt. All transformed sprite alpha extents are checked against declared bounds on every frame. Custom scene drawing has its own review obligations.
• The existing seeded paper-glider flight model and connected-alpha sprite cleaner, plus a general frame-addressed lyric-art entrance/hold/exit helper. The flight model is stylized animation; it does not simulate real aerodynamics or establish musical synchronization by itself.
• H.264/yuv420p + AAC MP4 with fast start, full decoding, exact decoded frame count and every decoded timestamp checked for CFR. Audio length, sample rate and channel count are checked against the source. Includes encoded QA stills, a poster, phone preview, input/output hashes, commands and logs.

Project format

Start from framerudiments demo and replace its synthetic assets. Every file reference has path and sha256; paths are relative to the project JSON unless absolute. See docs/project-format.md for all fields and docs/extraction.md for source mechanisms and boundaries.

from framerudiments import Project, render

project = Project.load("release/project.json")

def scene(image, context):
    # Existing custom drawing consumes frame, source_seconds, output_seconds,
    # beat, lyric and cue. Return a frame-sized RGBA image.
    return image

render(project, "release/new-render", scene=scene, ffmpeg="/path/to/ffmpeg")

Pin any assets used by a custom scene with project.ref({"path": ..., "sha256": ...}) before rendering. The hook is supplied by trusted Python code, never imported or executed from a project JSON. Do not reproduce clock, sampling, caption, encode or verification loops in release adapters.

Evidence and limits

plan is preparation, preflight checks all composed frames without encoding, and render produces technical-QA passed; creative and attended listening review pending. No command uploads, schedules or publishes anything. Automatic checks cannot establish sung-word accuracy, pleasant motion, a musical loop seam, platform preview acceptance, rights or public eligibility. Caption boxes are composition constraints, not current official platform safe-zone verification. Review the exact encoded file and destination preview.

Constant-BPM and saved variable-grid clocks record their authority/status; an estimate never becomes artist confirmation. Beat grids extrapolate from their first/last interval outside their covered extent; constrain projects to supported intervals where that is unsuitable. A ranked match does not prove whole-song alignment. Recording source/axis provenance is retained; the author must select the correct master/stem association. No live WordPress timing, sensor or plugin configuration is changed by offline rendering.

All text in captions.ass is a portable timing sidecar with neutral styling; the raster compositor remains the authority for the approved layout.

Development

python -m pip install -e '.[dev]'
ruff check .
pytest
python -m build

Set FRAMERUDIMENTS_TEST_FONT and FRAMERUDIMENTS_FFMPEG to run all integration tests. Without them, corresponding checks report skipped. Tests cover native sampling, non-looping recordings, input identity, lyric clears, excerpt/repeat boundaries, text/alpha overflow and actual encoded portrait/landscape/square outputs. Use synthetic fixtures; never put songs, personal data or private analysis outputs into the source distribution.

Source, contribution and releases

Canonical repository · Python package · Issues and improvements

Read CONTRIBUTING.md before changing the engine. Improvements belong in focused pull requests to the canonical repository, with current README, meaningful tests and reproducible synthetic examples.

The GitHub Actions CI runs the complete render suite on Linux and Windows with Python 3.11 and 3.13. The release workflow validates the immutable v<version> tag, re-runs tests, builds/checks wheel and source distribution, performs a clean wheel render and publishes exact checksum-labelled assets. Pushing a new v* tag publishes to GitHub and PyPI automatically after validation; no human reviewer or manual publication approval is required. The pypi environment has no reviewer gate. An existing release is reused only after its source commit and downloaded checksums match; assets are never overwritten. Manual dispatch can resume a registry upload from an existing immutable tag, preserving its exact GitHub bytes. The PyPI job uses a separately configured trusted publisher; no API token is stored in this project. A GitHub release and a PyPI listing are separately verified outcomes.