Version 0.1.0 (#1)

Reviewed-on: #1
Co-authored-by: pedro-bento <mail@pbento.pt>
Co-committed-by: pedro-bento <mail@pbento.pt>

.forgejo/workflows/ci.yml

@@ -0,0 +1,45 @@
+name: CI
+
+# Forgejo Actions workflow. Forgejo resolves workflows from
+# .forgejo/workflows/ first (then .gitea/workflows/, then .github/workflows/).
+#
+# `runs-on: docker` matches the label exposed by the standard self-hosted
+# Forgejo runner. Change it if your runner was registered with another label.
+#
+# Actions are pinned to node20-compatible releases. Older forgejo-runner
+# versions (e.g. v6.4.0) reject any action whose action.yml declares
+# `using: node24` — checkout v4 is the last line that runs on node20.
+#
+# The pull-request-only version-bump gate lives in its own workflow
+# (version-bump.yml) because Forgejo does not reliably skip a job on a
+# job-level `if:` and reports the skipped job as a failure instead.
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  lint-and-test:
+    runs-on: docker
+    steps:
+      - name: Checkout
+        # v4 runs on node20 (v5+ require node24).
+        uses: https://data.forgejo.org/actions/checkout@v4
+
+      - name: Install uv
+        # Installed from the official script rather than a Node action so the
+        # job works on runners that only support node20.
+        run: |
+          curl -LsSf https://astral.sh/uv/install.sh | sh
+          echo "$HOME/.local/bin" >> "$GITHUB_PATH"
+          export PATH="$HOME/.local/bin:$PATH"
+          uv python install 3.13
+          uv --version
+
+      - name: Lint (ruff)
+        run: uvx --python 3.13 ruff check .
+
+      - name: Test (pytest)
+        # The suite only needs pytest: cadence.py imports nothing third-party
+        # at module level, so no torch/whisper/ffmpeg is required here.
+        run: uv run --python 3.13 --with pytest pytest -q

.forgejo/workflows/version-bump.yml

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+name: Version bump
+
+# Runs only on pull requests: it compares cadence.py's __version__ on the head
+# branch against the base branch and fails if the version was not increased.
+#
+# Kept as a separate workflow rather than a job-level `if:` inside ci.yml:
+# forgejo-runner does not reliably skip a job on `if:` and reports the skipped
+# job as a failure on push events.
+
+on:
+  pull_request:
+
+jobs:
+  version-bump:
+    runs-on: docker
+    steps:
+      - name: Checkout
+        # v4 runs on node20 (v5+ require node24); full history so the base
+        # branch is reachable for the comparison.
+        uses: https://data.forgejo.org/actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Require a version bump
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          # `github.base_ref` is the GitHub-compatible alias and is understood
+          # by Forgejo; `forgejo.base_ref` is the canonical spelling.
+          BASE="${{ github.base_ref }}"
+          if [ -z "$BASE" ]; then
+            echo "No base ref; skipping version check."
+            exit 0
+          fi
+
+          git fetch --no-tags origin "$BASE"
+
+          if [ ! -f cadence.py ]; then
+            echo "::error::cadence.py is missing from the change."
+            exit 1
+          fi
+
+          NEW=$(sed -n 's/^__version__[[:space:]]*=[[:space:]]*"\([^"]*\)".*/\1/p' cadence.py | head -n1)
+          if [ -z "$NEW" ]; then
+            echo "::error::No __version__ found in cadence.py"
+            exit 1
+          fi
+
+          # The script may be introduced by this very PR: if it does not exist
+          # on the base branch there is no previous version to bump from.
+          if ! git cat-file -e "FETCH_HEAD:cadence.py" 2>/dev/null; then
+            echo "cadence.py is new to '$BASE' (no base version); version check passes."
+            exit 0
+          fi
+
+          OLD=$(git show "FETCH_HEAD:cadence.py" | sed -n 's/^__version__[[:space:]]*=[[:space:]]*"\([^"]*\)".*/\1/p' | head -n1)
+          echo "base __version__: ${OLD:-<none>}  head __version__: $NEW"
+          if [ -z "$OLD" ]; then
+            echo "Could not read a base version; skipping."
+            exit 0
+          fi
+
+          # Require NEW to be strictly greater than OLD (version sort).
+          GREATER=$(printf '%s\n%s\n' "$OLD" "$NEW" | sort -V | tail -n1)
+          if [ "$NEW" = "$GREATER" ] && [ "$OLD" != "$NEW" ]; then
+            echo "Version bumped: $OLD -> $NEW"
+          else
+            echo "::error::cadence.py __version__ must be bumped above $OLD (currently $NEW)."
+            exit 1
+          fi

.gitignore

@@ -0,0 +1,18 @@
+# Python
+__pycache__/
+*.py[cod]
+.pytest_cache/
+.ruff_cache/
+.venv/
+venv/
+
+# Files generated by cadence
+*.kdenlive
+*.srt
+*_llm_transcript.txt
+*.whisper.json
+*.tmp
+
+# OS / editor cruft
+.DS_Store
+Thumbs.db

README.md

@@ -1,2 +1,77 @@
 # cadence
 
+High-retention auto-editor for raw video recordings. It transcribes your audio, cuts silences and filler words, and writes a native `.kdenlive` project ready for final polish — plus `.srt` captions and an LLM-friendly transcript.
+
+## Quick start
+
+### Linux
+
+```sh
+# uv — installs to ~/.local/bin
+curl -LsSf https://astral.sh/uv/install.sh | sh
+
+# FFmpeg — pick your distro
+sudo apt install ffmpeg                           # Debian / Ubuntu
+sudo dnf swap ffmpeg-free ffmpeg --allowerasing   # Fedora
+sudo pacman -S ffmpeg                             # Arch
+
+# Run
+uv run cadence.py recording.mp4 --preset balanced --captions
+```
+
+> - **uv** installs to `~/.local/bin`; make sure that directory is on your `PATH` (the installer normally adds it — otherwise `export PATH="$HOME/.local/bin:$PATH"` in your shell profile).
+> - **Fedora**: enable [RPM Fusion](https://rpmfusion.org/Configuration) first. Fedora ships `ffmpeg-free`, which conflicts with the full `ffmpeg` package, so swap rather than install — `sudo dnf swap ffmpeg-free ffmpeg --allowerasing`.
+> - **Nobara**: codecs are managed by Nobara and manual changes are blocked. Run `nobara-sync install-codecs` (or the Codec Wizard) instead of `dnf swap`.
+
+### macOS
+
+```sh
+brew install uv ffmpeg
+
+uv run cadence.py recording.mp4 --preset balanced --captions
+```
+
+### Windows (PowerShell)
+
+```powershell
+powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"   # uv
+winget install -e --id Gyan.FFmpeg                                                   # FFmpeg
+
+uv run cadence.py recording.mp4 --preset balanced --captions
+```
+
+## Install as a command (Linux & macOS)
+
+Make `cadence` available everywhere by symlinking the script into a directory on your `PATH`:
+
+```sh
+chmod +x cadence.py
+mkdir -p ~/.local/bin
+ln -sf "$PWD/cadence.py" ~/.local/bin/cadence
+```
+
+Now call it from any directory:
+
+```sh
+cadence recording.mp4 --preset balanced --captions
+```
+
+`~/.local/bin` is added to `PATH` by the uv installer; if it isn't, add `export PATH="$HOME/.local/bin:$PATH"` to your shell profile (`~/.bashrc`, `~/.zshrc`, etc.).
+
+## Output
+
+- `recording.kdenlive` — the edited project.
+- `recording.srt` and `recording_llm_transcript.txt` — generated when `--captions` is used.
+
+Presets: `relaxed`, `balanced`, `punchy`. See all options with `uv run cadence.py --help`.
+
+## Development
+
+Run the linter and tests locally:
+
+```sh
+uvx ruff check .
+uv run --with pytest pytest -q
+```
+
+The test suite needs only `pytest` — `cadence.py` imports nothing third-party at module level, so no torch/whisper/ffmpeg is required to run it. CI runs both via Forgejo Actions (`.forgejo/workflows/ci.yml`).

pytest.ini

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+[pytest]
+testpaths = tests

ruff.toml

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+line-length = 100
+target-version = "py313"
+
+[lint]
+select = ["E", "F", "I"]
+# E501 is intentionally ignored: the file embeds long prose (the LLM prompt
+# template) and a few generated-string lines that cannot be wrapped cleanly.
+ignore = ["E501"]

tests/conftest.py

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+import sys
+from pathlib import Path
+
+sys.path.insert(0, str(Path(__file__).resolve().parents[1]))
+
+import pytest  # noqa: E402
+
+import cadence  # noqa: E402
+
+
+@pytest.fixture
+def make_track(tmp_path):
+    """Small factory for building VideoTrackData objects in tests."""
+
+    def _make(
+        *,
+        name: str = "video.mp4",
+        duration: float = 2.0,
+        fps_num: int = 30,
+        fps_den: int = 1,
+        width: int = 1920,
+        height: int = 1080,
+        audio_track_idx: int = 0,
+        audio_stream_count: int = 1,
+        words: list | None = None,
+        timeline: list | None = None,
+    ) -> cadence.VideoTrackData:
+        if timeline is None:
+            timeline = [cadence.Segment(0.0, duration, "keep")]
+        return cadence.VideoTrackData(
+            video=tmp_path / name,
+            duration=duration,
+            fps_num=fps_num,
+            fps_den=fps_den,
+            width=width,
+            height=height,
+            audio_track_idx=audio_track_idx,
+            audio_stream_count=audio_stream_count,
+            words=list(words) if words else [],
+            timeline=list(timeline),
+        )
+
+    return _make

tests/test_core.py

@@ -0,0 +1,290 @@
+import json
+import sys
+
+import pytest
+
+from cadence import (
+    Segment,
+    Word,
+    _cache_key,
+    _read_cache,
+    _write_cache,
+    build_timeline,
+    compute_jl_cut_shifts,
+    frames_to_tc,
+    map_words_to_edited_timeline,
+    normalize_token,
+    parse_args,
+)
+
+# ---------------------------------------------------------------------------
+# normalize_token
+# ---------------------------------------------------------------------------
+
+@pytest.mark.parametrize(
+    ("raw", "expected"),
+    [
+        ("Uh...", "uh"),
+        ("—", ""),
+        ('"Hello,"', "hello"),
+        ("  Word?  ", "word"),
+        ("...", ""),
+        ("Umm!", "umm"),
+    ],
+)
+def test_normalize_token(raw, expected):
+    assert normalize_token(raw) == expected
+
+
+# ---------------------------------------------------------------------------
+# frames_to_tc
+# ---------------------------------------------------------------------------
+
+def test_frames_to_tc_zero_and_negative():
+    assert frames_to_tc(0, 30.0) == "00:00:00.000"
+    assert frames_to_tc(-7, 30.0) == "00:00:00.000"
+
+
+def _parse_tc(tc: str) -> float:
+    h, m, s = tc.split(":")
+    return int(h) * 3600 + int(m) * 60 + float(s)
+
+
+@pytest.mark.parametrize("frames", [1, 30, 100, 1000, 30000, 90000])
+def test_frames_to_tc_roundtrip_ntsc(frames):
+    fps = 30000 / 1001
+    tc = frames_to_tc(frames, fps)
+    secs = _parse_tc(tc)
+    back = round(secs * fps)
+    assert abs(back - frames) <= 1
+
+
+# ---------------------------------------------------------------------------
+# build_timeline
+# ---------------------------------------------------------------------------
+
+def _assert_tiling(timeline, duration, min_keep):
+    assert timeline, "timeline must not be empty"
+
+    # Alternating keep/drop actions.
+    for prev, nxt in zip(timeline, timeline[1:]):
+        assert prev.action != nxt.action
+
+    # Contiguous tiling of [0, duration].
+    assert timeline[0].start == pytest.approx(0.0)
+    for prev, nxt in zip(timeline, timeline[1:]):
+        assert prev.end == pytest.approx(nxt.start)
+    assert timeline[-1].end == pytest.approx(duration)
+
+    keep = sum(s.end - s.start for s in timeline if s.action == "keep")
+    drop = sum(s.end - s.start for s in timeline if s.action == "drop")
+    assert keep == pytest.approx(duration - drop)
+
+    for seg in timeline:
+        if seg.action == "keep":
+            assert (seg.end - seg.start) >= min_keep - 1e-9
+
+
+@pytest.mark.parametrize(
+    ("cuts", "duration"),
+    [
+        ([], 10.0),
+        ([(2.0, 3.0, "silence"), (5.0, 6.0, "filler")], 10.0),
+        ([(0.0, 1.0, "x"), (9.5, 10.0, "y")], 10.0),
+        ([(0.0, 2.0, "a"), (2.02, 4.0, "b")], 5.0),
+        ([(1.0, 2.0, "a"), (2.0, 3.0, "b"), (3.0, 4.0, "c")], 4.0),
+    ],
+)
+def test_build_timeline_invariants(cuts, duration):
+    min_keep = 0.08
+    timeline = build_timeline(cuts, duration, min_keep_dur=min_keep)
+    _assert_tiling(timeline, duration, min_keep)
+
+
+def test_build_timeline_no_cuts_single_keep():
+    assert build_timeline([], 5.0) == [Segment(0.0, 5.0, "keep")]
+
+
+def test_build_timeline_zero_duration_returns_keep():
+    # Verified real behavior: the empty list falls through to a single keep
+    # segment spanning [0, 0].
+    assert build_timeline([], 0.0) == [Segment(0.0, 0.0, "keep")]
+
+
+# ---------------------------------------------------------------------------
+# compute_jl_cut_shifts
+# ---------------------------------------------------------------------------
+
+def _keeps(*pairs):
+    return [Segment(s, e, "keep") for s, e in pairs]
+
+
+def _assert_jl_bounds(segs, shifts, fps, jl_frames):
+    for i in range(len(segs) - 1):
+        cur_in = int(round(segs[i].start * fps))
+        cur_out = int(round(segs[i].end * fps))
+        cur_dur = max(1, cur_out - cur_in)
+        next_in = int(round(segs[i + 1].start * fps))
+        next_out = int(round(segs[i + 1].end * fps))
+        next_dur = max(1, next_out - next_in)
+        handle = max(0, next_in - cur_out - 1)
+        bound = min(jl_frames, handle, cur_dur // 4, next_dur // 4)
+        assert abs(shifts[i]) <= bound
+    assert shifts[-1] == 0
+
+
+def test_jl_off_and_trivial_cases():
+    segs = _keeps((0, 1), (2, 3), (4, 5))
+    assert compute_jl_cut_shifts(segs, 30.0, "off", 10) == [0, 0, 0]
+    assert compute_jl_cut_shifts(segs, 30.0, "j", 0) == [0, 0, 0]
+    assert compute_jl_cut_shifts(_keeps((0, 1)), 30.0, "j", 10) == [0]
+    assert compute_jl_cut_shifts([], 30.0, "j", 10) == []
+
+
+def test_jl_j_signs_and_bounds():
+    segs = _keeps((0, 1), (2, 3), (4, 5))
+    shifts = compute_jl_cut_shifts(segs, 30.0, "j", 2)
+    assert shifts == [2, 2, 0]
+    assert all(x >= 0 for x in shifts)
+    _assert_jl_bounds(segs, shifts, 30.0, 2)
+
+
+def test_jl_l_signs_and_bounds():
+    segs = _keeps((0, 1), (2, 3), (4, 5))
+    shifts = compute_jl_cut_shifts(segs, 30.0, "l", 2)
+    assert shifts == [-2, -2, 0]
+    assert all(x <= 0 for x in shifts)
+    _assert_jl_bounds(segs, shifts, 30.0, 2)
+
+
+def test_jl_clamped_by_handle():
+    # Touching segments leave no handle, so even a large request becomes 0.
+    segs = _keeps((0, 1), (1, 2))
+    assert compute_jl_cut_shifts(segs, 30.0, "j", 100) == [0, 0]
+
+
+def test_jl_last_element_always_zero():
+    segs = _keeps((0, 1), (2, 3), (4, 5), (6, 7))
+    for mode in ("j", "l"):
+        assert compute_jl_cut_shifts(segs, 30.0, mode, 2)[-1] == 0
+
+
+# ---------------------------------------------------------------------------
+# map_words_to_edited_timeline
+# ---------------------------------------------------------------------------
+
+def test_map_words_to_edited_timeline(make_track):
+    td1 = make_track(
+        name="a.mp4",
+        duration=4.0,
+        timeline=[
+            Segment(0.0, 2.0, "keep"),
+            Segment(2.0, 3.0, "drop"),
+            Segment(3.0, 4.0, "keep"),
+        ],
+        words=[
+            Word("a", 1.0, 1.2),
+            Word("dropped", 2.1, 2.3),
+            Word("b", 3.1, 3.3),
+        ],
+    )
+    td2 = make_track(
+        name="b.mp4",
+        duration=3.0,
+        timeline=[Segment(0.0, 3.0, "keep")],
+        words=[Word("c", 0.5, 0.7)],
+    )
+
+    mapped = map_words_to_edited_timeline([td1, td2])
+    onsets = {text: (s, e) for s, e, text in mapped}
+
+    assert "dropped" not in onsets
+    assert onsets["b"][0] == pytest.approx(2.1)
+    assert onsets["c"][0] == pytest.approx(3.5)
+    assert len(mapped) == 3
+
+
+# ---------------------------------------------------------------------------
+# cache helpers
+# ---------------------------------------------------------------------------
+
+def test_cache_roundtrip_and_no_version_key(tmp_path):
+    path = tmp_path / "cache.json"
+    words = [Word("Hello", 0.0, 0.5), Word("world", 0.5, 1.0)]
+
+    _write_cache(path, words)
+
+    assert _read_cache(path) == words
+    payload = json.loads(path.read_text(encoding="utf-8"))
+    assert "version" not in payload
+    assert payload["words"][0] == {"text": "Hello", "start": 0.0, "end": 0.5}
+
+
+def test_write_cache_empty_words_writes_nothing(tmp_path):
+    path = tmp_path / "empty.json"
+    _write_cache(path, [])
+    assert not path.exists()
+
+
+def test_read_cache_corrupt_returns_none(tmp_path):
+    path = tmp_path / "bad.json"
+    path.write_text("{not valid json", encoding="utf-8")
+    assert _read_cache(path) is None
+
+
+def test_read_cache_empty_words_returns_empty_list(tmp_path):
+    path = tmp_path / "empty.json"
+    path.write_text(json.dumps({"words": []}), encoding="utf-8")
+    assert _read_cache(path) == []
+
+
+def test_read_cache_bare_list_returns_none(tmp_path):
+    path = tmp_path / "list.json"
+    path.write_text(json.dumps([{"text": "x", "start": 0, "end": 1}]), encoding="utf-8")
+    assert _read_cache(path) is None
+
+
+def test_cache_key_varies_with_model_and_language():
+    base = _cache_key("large-v3", "faster-whisper", "en")
+    assert base != _cache_key("small", "faster-whisper", "en")
+    assert base != _cache_key("large-v3", "faster-whisper", "fr")
+    assert base == _cache_key("large-v3", "faster-whisper", "en")
+
+
+# ---------------------------------------------------------------------------
+# parse_args
+# ---------------------------------------------------------------------------
+
+def _parse(monkeypatch, argv):
+    monkeypatch.setattr(sys, "argv", ["cadence.py", *argv])
+    return parse_args()
+
+
+@pytest.mark.parametrize(
+    "argv",
+    [
+        ["video.mp4", "--audio-track", "0"],
+        ["video.mp4", "--jl-frames", "-1"],
+        ["video.mp4", "--pad", "-0.1"],
+        ["video.mp4", "--max-silence", "abc"],
+    ],
+)
+def test_parse_args_rejects_invalid(monkeypatch, argv):
+    with pytest.raises(SystemExit) as exc:
+        _parse(monkeypatch, argv)
+    assert exc.value.code != 0
+
+
+def test_parse_args_defaults_are_none(monkeypatch):
+    args = _parse(monkeypatch, ["video.mp4"])
+    assert args.max_silence is None
+    assert args.pad is None
+    assert args.min_keep is None
+    assert args.jl_frames is None
+    assert args.preset is None
+
+
+def test_parse_args_version_exits_zero(monkeypatch):
+    with pytest.raises(SystemExit) as exc:
+        _parse(monkeypatch, ["--version"])
+    assert exc.value.code == 0

tests/test_kdenlive.py

@@ -0,0 +1,70 @@
+import json
+import xml.etree.ElementTree as ET
+
+import cadence
+
+
+def _write_and_parse(make_track, tmp_path, **kwargs):
+    td = make_track(**kwargs)
+    out = tmp_path / "project"
+    cadence._generate_multi_kdenlive_project([td], out)
+    kdenlive = out.with_suffix(".kdenlive")
+    assert kdenlive.exists()
+    return ET.parse(kdenlive).getroot()
+
+
+def _sequence_tractor(root):
+    for tractor in root.findall("tractor"):
+        if tractor.find("property[@name='kdenlive:uuid']") is not None:
+            return tractor
+    raise AssertionError("sequence tractor not found")
+
+
+def _track_producers(tractor):
+    return [t.get("producer") for t in tractor.findall("track")]
+
+
+def _group_track_indices(tractor):
+    prop = tractor.find("property[@name='kdenlive:sequenceproperties.groups']")
+    groups = json.loads(prop.text)
+    return [child["data"].split(":")[0] for group in groups for child in group["children"]]
+
+
+def test_project_with_system_audio(make_track, tmp_path):
+    root = _write_and_parse(
+        make_track, tmp_path, audio_stream_count=2, audio_track_idx=0
+    )
+
+    assert root.find("chain[@id='chain_a2_0']") is not None
+
+    seq = _sequence_tractor(root)
+    assert _track_producers(seq) == ["producer0", "tractor0", "tractor_a2", "tractor1"]
+    assert _group_track_indices(seq) == ["0", "1", "2"]
+
+
+def test_project_without_system_audio(make_track, tmp_path):
+    root = _write_and_parse(
+        make_track, tmp_path, audio_stream_count=1, audio_track_idx=0
+    )
+
+    assert root.find("chain[@id='chain_a2_0']") is None
+
+    seq = _sequence_tractor(root)
+    assert _track_producers(seq) == ["producer0", "tractor0", "tractor1"]
+    assert _group_track_indices(seq) == ["0", "1"]
+
+
+def test_system_stream_wiring_audio_track_0(make_track, tmp_path):
+    root = _write_and_parse(
+        make_track, tmp_path, audio_stream_count=2, audio_track_idx=0
+    )
+    chain = root.find("chain[@id='chain_a2_0']")
+    assert chain.find("property[@name='astream']").text == "1"
+
+
+def test_system_stream_wiring_audio_track_1(make_track, tmp_path):
+    root = _write_and_parse(
+        make_track, tmp_path, audio_stream_count=2, audio_track_idx=1
+    )
+    chain = root.find("chain[@id='chain_a2_0']")
+    assert chain.find("property[@name='astream']").text == "0"

tests/test_transcripts.py

@@ -0,0 +1,25 @@
+import cadence
+from cadence import Segment, Word
+
+
+def test_generate_combined_transcripts(make_track, tmp_path):
+    td = make_track(
+        name="video.mp4",
+        duration=2.0,
+        timeline=[Segment(0.0, 2.0, "keep")],
+        words=[Word("Hello.", 0.2, 0.5), Word("world.", 0.6, 0.9)],
+    )
+    out = tmp_path / "captions"
+
+    cadence.generate_combined_transcripts([td], out)
+
+    srt = out.with_suffix(".srt")
+    assert srt.exists()
+    assert srt.stat().st_size > 0
+
+    llm_transcript = out.with_name(f"{out.stem}_llm_transcript.txt")
+    assert llm_transcript.exists()
+    assert llm_transcript.stat().st_size > 0
+
+    # Atomic writes must not leave temp files behind.
+    assert not list(tmp_path.glob("*.tmp"))

tests/test_version.py

@@ -0,0 +1,23 @@
+"""Version metadata checks.
+
+These keep the CI version-bump gate meaningful: `__version__` must stay a
+parseable `MAJOR.MINOR.PATCH` string and be surfaced by `--version`.
+"""
+
+import re
+import sys
+
+import cadence
+
+
+def test_version_is_semver():
+    assert re.fullmatch(r"\d+\.\d+\.\d+", cadence.__version__)
+
+
+def test_version_flag_reports_version(monkeypatch, capsys):
+    monkeypatch.setattr(sys, "argv", ["cadence", "--version"])
+    try:
+        cadence.parse_args()
+    except SystemExit as exc:
+        assert exc.code == 0
+    assert cadence.__version__ in capsys.readouterr().out