CineAudioDB: 9 real productions, 24-bit/48kHz FLAC stems (dialogue/music/sfx) with linear & production mixes

.gitattributes

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+*.flac filter=lfs diff=lfs merge=lfs -text
+*.wav filter=lfs diff=lfs merge=lfs -text

NOTICE.md

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+# NOTICE — Source attributions
+
+CineAudioDB contains audio **derived from** the works below. Attribution is required by the
+Creative Commons licenses of the source material. The mapping between these works and the
+anonymized `film_0X` identifiers is intentionally not published; this notice provides the
+attribution required by the CC-BY licenses without de-anonymizing the dataset.
+
+## Creative Commons source works (open-source animations)
+
+The open-source animation productions are derived from short films produced by the
+**Blender Foundation / Blender Institute** (https://www.blender.org), released under
+Creative Commons Attribution licenses:
+
+- **Sprite Fright** — © Blender Foundation, cloud.blender.org — licensed **CC-BY 4.0**
+- **Cosmos Laundromat: First Cycle** — © Blender Foundation, gooseberry.blender.org — licensed **CC-BY 4.0**
+- **Glass Half** — © Blender Foundation — licensed **CC-BY 3.0**
+
+Derived audio in this dataset (isolated stems, stereo downmixes, linear and reconstructed
+mixes) constitutes adaptations of the original soundtracks. The original works remain
+© Blender Foundation and are used under the terms of their respective CC-BY licenses.
+No endorsement by the Blender Foundation is implied.
+
+Sound effects and ambiences within these soundtracks may themselves originate from
+third-party libraries (e.g. Freesound) under their own licenses; consult the original
+productions' credits for details.
+
+## CC-BY-SA source work (Morevna / Pepper & Carrot)
+
+Four productions (the English and Russian versions of two animated shorts) are derived from the
+**Pepper & Carrot** motion-comic adaptation by the **Morevna Project**, based on the webcomic
+**Pepper & Carrot by David Revoy** (https://www.davidrevoy.com, https://morevnaproject.org),
+released under **Creative Commons Attribution-ShareAlike 4.0 (CC-BY-SA 4.0)**.
+
+Because CC-BY-SA is **copyleft**, any redistribution of these derived stems/mixes (and arguably any
+dataset bundle containing them) must itself be licensed **CC-BY-SA 4.0** with attribution. Keep these
+items' licensing distinct from the CC-BY material above.
+
+The dialogue/music/sfx stems for these two were **rendered from the production's Blender VSE** (audio
+strips grouped by source folder and mixed down per group).
+
+**Embedded third-party audio:** the sound-effects and music in this production are **third-party clips
+assembled from Freesound and other CC sources**, each with its own license and required attribution
+(e.g. contributors potentjello, kwahmah_02, FreqMan, GowlerMusic, Benboncan, joedeshon, edhutschek,
+AudioRiggs, unfa, Taira Komori, and others — full list in the source project's `credits/sound-fx.txt`).
+**These individual clip licenses have not been audited here and may include NonCommercial (CC-BY-NC)
+terms** — review them before any commercial use or redistribution.
+
+## License of the dataset compilation
+
+The selection, arrangement, processing scripts, and metadata of CineAudioDB are provided for
+research use. Downstream users must honor the per-production licenses recorded in
+`metadata.csv` and `films.json`.

README.md

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+---
+pretty_name: CineAudioDB
+license: other
+license_name: mixed-cc-by-sa-and-cc-by
+language:
+  - en
+  - fr
+  - de
+  - ru
+task_categories:
+  - audio-to-audio
+tags:
+  - audio-source-separation
+  - cinematic-audio
+  - music-source-separation
+  - speech-enhancement
+  - dnr
+  - film-audio
+size_categories:
+  - n<1K
+---
+
+# CineAudioDB
+
+**A real-world evaluation set for cinematic audio source separation.**
+
+CineAudioDB contains real film/animation productions with ground-truth stems
+(**dialogue**, **music**, **sfx**) for evaluating cinematic source-separation models.
+Unlike synthetic datasets that sum stems linearly, real productions are mixed with a
+non-linear mastering chain (compression, limiting, sidechain ducking, reverb), so the
+released stems do **not** generally sum to the mastered mix. To support fair evaluation
+under both assumptions, every production is provided in two input versions:
+
+- **`linear_mix`** — the three stems summed (perfectly additive: `mix = dialogue + music + sfx`).
+- **`production_mix`** — the real mastered stereo mix (non-additive; this is what audiences hear).
+
+This is the real-content evaluation companion to the synthetic generation pipeline described
+in the accompanying paper.
+
+## At a glance
+
+| | |
+|---|---|
+| Productions | 9 (7 open-source animations + 2 student production) |
+| Stems | `dialogue`, `music`, `sfx` (ambience merged into sfx); `film_01` also ships 8 fine stems → 3-/4-stem groupings |
+| Mix versions | `linear_mix` (additive), `production_mix` (mastered, where available) |
+| Total duration | **2.46 h** |
+| Audio format | **FLAC (lossless), 24-bit, 48 kHz** |
+| Channels | stereo (one production is mono native) |
+
+## Why two mix versions
+
+Mask-based separators (e.g. Bandit, MRX) assume `mix = Σ stemₖ` and estimate each source as
+`ŝₖ = x ⊙ mₖ`. Real mastered mixes break this assumption: mastering redistributes and limits
+energy so individual stems routinely exceed the mix in some time-frequency bins.
+
+- Evaluate on **`linear_mix`** to isolate model quality from the mixing-process mismatch
+  (the input decomposes *exactly* into the ground-truth stems).
+- Evaluate on **`production_mix`** to measure real deployment performance on professionally
+  mastered audio. Because the mapping is non-additive, scale-/shift-sensitive metrics (e.g.
+  SI-SNR) are best complemented by listening tests.
+
+## Directory structure
+
+```
+CineAudioDB/
+├── README.md
+├── NOTICE.md            # source attributions (CC-BY)
+├── metadata.csv         # one row per audio file (HF audiofolder-compatible)
+├── films.json           # per-production summary
+└── data/
+    ├── film_01/         # dialogue, music, sfx, linear_mix          (additive)
+    │   └── fine/        # 8 atomic print-master stems (see below)
+    ├── film_02/         # dialogue, music, sfx, linear_mix, production_mix
+    ├── film_03/         # dialogue, music, sfx, linear_mix, production_mix   (mono)
+    └── film_04/         # dialogue, music, sfx, linear_mix, production_mix
+```
+
+Within a production, every file has identical length, sample rate, and channel count.
+
+### Fine stems (film_01)
+
+`film_01` is delivered as a full professional print master, so it uniquely ships its **8 atomic
+stem categories** in `data/film_01/fine/` — `dx` (dialogue), `vo` (voice-over), `mx` (music),
+`fx` (hard effects), `fol` (foley), `bg` (backgrounds/ambience), `pfx` (production effects),
+`arch` (archival). They are scaled by the same per-production gain as the 3-stem files, so any
+grouping sums **exactly** (to 24-bit precision) to the corresponding stem and to `linear_mix`:
+
+| grouping | dialogue | music | ambience | sfx |
+|---|---|---|---|---|
+| **3-stem** (top-level files) | `dx+vo` | `mx` | — | `fx+fol+bg+pfx+arch` |
+| **4-stem** (paper's synthesis taxonomy) | `dx+vo` | `mx` | `bg` | `fx+fol+pfx+arch` |
+
+```python
+import soundfile as sf, numpy as np
+fine = "data/film_01/fine/"
+def s(*names): return sum(sf.read(fine+n+".flac")[0] for n in names)
+dialogue, music, ambience, sfx = s("dx","vo"), s("mx"), s("bg"), s("fx","fol","pfx","arch")
+# dialogue + music + ambience + sfx == data/film_01/linear_mix.flac  (24-bit precision)
+```
+
+## Productions (anonymized)
+
+| id | duration | channels | mix type | production_mix | source | license |
+|----|---------:|----------|----------|:--------------:|--------|---------|
+| `film_01` | 78.00 min | stereo (downmix from 5.1) | additive¹ | — | student production | **CC-BY-SA-4.0** |
+| `film_02` | 12.11 min | stereo | non-additive | ✓ | open-source animation | CC-BY-4.0 |
+| `film_03` | 10.45 min | **mono** | non-additive | ✓ | open-source animation | CC-BY-4.0 |
+| `film_04` |  3.22 min | stereo (DAW reconstruction) | non-additive | ✓ | open-source animation | CC-BY-3.0 |
+| `film_05` |  7.58 min | stereo (Blender VSE render) | non-additive | ✓ | open-source animation (EN) | **CC-BY-SA-4.0** |
+| `film_06` |  7.59 min | stereo (Blender VSE render) | non-additive | ✓ | open-source animation (RU) | **CC-BY-SA-4.0** |
+| `film_07` |  1.89 min | stereo (Blender VSE render) | additive³ | — | open-source animation (EN) | **CC-BY-SA-4.0** |
+| `film_08` |  1.90 min | stereo (Blender VSE render) | additive³ | — | open-source animation (RU) | **CC-BY-SA-4.0** |
+| `film_09` | 25.00 min | stereo | non-additive | ✓ | student production | **CC-BY-SA-4.0** |
+
+
+## Audio format & normalization
+
+- **FLAC (lossless), 24-bit, 48 kHz** throughout — bit-exact to the source PCM (verified `maxdiff=0`),
+  decoded transparently by `soundfile` and 🤗 `datasets`.
+- Surround sources are downmixed to stereo via **ITU-R BS.775**
+  (`Lt = L + 0.707·C + 0.707·Ls`, `Rt = R + 0.707·C + 0.707·Rs`; LFE dropped).
+- A single per-production gain is applied uniformly to **all** files of that production so the
+  loudest signal peaks at **−1 dBFS** (no clipping in fixed-point). This preserves the additive
+  property (`linear_mix = g·(dialogue+music+sfx)`) and the relative balance between stems and the
+  production mix. The applied gain is recorded in `films.json`.
+- Additivity verified: `max|dialogue+music+sfx − linear_mix| ≈ 2·10⁻⁷` (24-bit quantization floor).
+
+## Loading
+
+```python
+import soundfile as sf
+
+# additive evaluation: input decomposes exactly into the targets
+mix,  sr = sf.read("data/film_02/linear_mix.flac")
+dia,  _  = sf.read("data/film_02/dialogue.flac")
+mus,  _  = sf.read("data/film_02/music.flac")
+sfx,  _  = sf.read("data/film_02/sfx.flac")
+# mix == dia + mus + sfx  (to 24-bit precision)
+
+# real-world evaluation: mastered, non-additive input
+prod, _  = sf.read("data/film_02/production_mix.flac")
+```
+
+Or via 🤗 `datasets` (each row = one audio file; filter on `component` / `kind` / `film_id`):
+
+```python
+from datasets import load_dataset
+ds = load_dataset("audiofolder", data_dir="CineAudioDB", split="test")
+stems = ds.filter(lambda r: r["kind"] == "target_stem")
+```
+
+`metadata.csv` columns: `file_name, film_id, component, kind, channels, sample_rate, bit_depth,
+frames, duration_sec, peak, mix_type, source_type, license`.
+
+## Processing & provenance
+
+Each production arrived in a different state; all were normalized to the layout above.
+
+- **film_01** — 8 professional print-master stem categories (DX, VO, MX, FX, FOL, BG, PFX, ARCH),
+  each as six 24-bit mono channels of a 5.1 mix. Each category was downmixed to stereo (BS.775) and
+  grouped: `dialogue = DX+VO`, `music = MX`, `sfx = FX+FOL+BG+PFX+ARCH`.
+- **film_02** — stems trimmed of 11.45 s trailing silence to align with the mastered mix; mono
+  center dialogue duplicated to L=R; original 24-bit stereo master used as `production_mix`.
+- **film_03** — native **mono, 16-bit**; kept mono (stereo cannot be honestly recovered) and upcast
+  to 24-bit. The supplied mixture is the mastered `production_mix`.
+- **film_04** — reconstructed from a DAW (Ardour) session by rendering each region (source slice,
+  region gain, fades, center pan) into per-category stereo buses; reverb sends and master-bus
+  plugins are intentionally **not** replicated, which is what makes the stems dry and the mix
+  non-additive. The real session render is the `production_mix`, advanced by 682 samples (~14 ms)
+  to compensate for master-bus latency and align with the stems.
+
+## Known limitations
+
+- **film_03 is mono.** Its `dialogue`/`music`/`sfx` and both mixes are single-channel.
+- **film_04 stems are dry reconstructions.** They omit master-bus reverb/EQ/limiting; the intro/outro
+  theme music audible in its `production_mix` is *not* isolated in the stems (it existed only inside a
+  full-mix bounce and was excluded to keep the music target clean). This is a genuine non-additive gap.
+- **`production_mix` ≠ Σ stems** for `film_02`–`film_04` by design. Use `linear_mix` when you need exact
+  additivity.
+- Surround productions lose the LFE channel in the stereo downmix (standard practice).
+
+## Citation
+
+```bibtex
+@inproceedings{cineaudiodb2026,
+  title     = {Realistic Data Generation and Evaluation for Cinematic Audio Source Separation},
+  author    = {Anonymous},
+  booktitle = {Interspeech (under review)},
+  year      = {2026}
+}
+```
+
+## Licensing & attribution
+
+This dataset mixes licenses. See **[NOTICE.md](NOTICE.md)** for the required attributions of the
+Creative Commons source works. The open-source animations are derived from CC-BY films
+(© Blender Foundation); the student productions are released under **CC-BY-SA 4.0**. You must
+comply with the per-production licenses
+listed in `metadata.csv` / `films.json`.

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