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crf-vmaf-training-data

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video-encoding
vmaf
crf
x264
x265
vp9
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metadata 
license: cc0-1.0
task_categories:
  - other
tags:
  - video-encoding
  - vmaf
  - crf
  - x264
  - x265
  - vp9
  - av1
  - lightgbm
  - video-quality
size_categories:
  - 1M<n<10M

CRF <-> VMAF training data

Training datasets behind Alice-1 - a LightGBM model that predicts the CRF value needed to hit a target VMAF score for a given video segment, codec and resolution.

Contents

File Rows Description
training_table.parquet 1,762,232 Main table. Feature aggregates -> CRF for a target VMAF, per codec/resolution.
probe_data.parquet 52,316 Probe-encode data. Two 2s probe encodes per (segment, codec, resolution) cell with measured VMAF + bitrate.

Schema: training_table

One row = (video segment * codec * target resolution * target VMAF) -> the CRF that achieves that VMAF.

Column Type Description
source_key string Source video identifier (dataset/filename)
dataset string Corpus subset (main, hc, ext, …)
split string Train/validation/test split
segment_start float Segment start time (s)
codec string x264, x265, vp9, av1
preset string Encoder preset (mostly veryfast; null for some rows)
source_width / source_height int Source resolution
target_width / target_height int Encoded resolution (720/1080/1440/2160)
fps float Frames per second
segment_duration float Segment length (s, ~10)
vmaf_model string VMAF model version
fit_method string How CRF was extracted from the encode ladder (logistic fit)
si_mean / si_std float Spatial Information (ITU-T P.910) mean/std over segment
ti_mean / ti_std float Temporal Information mean/std
vmafmotion float VMAF motion feature
target_vmaf int Target VMAF score (60–95)
crf float Label: CRF achieving target_vmaf

Schema: probe_data

One row = (segment * codec * resolution) with two cheap probe encodes.

Column Description
probe_crf1, probe_vmaf1, probe_bitrate1_kbps First probe encode (2s): CRF, measured VMAF, bitrate
probe_crf2, probe_vmaf2, probe_bitrate2_kbps Second probe encode (different CRF)
probe_sec Probe duration (2.0s)
probe_vmaf = probe_vmaf1 (primary probe feature)
probe_slope VMAF slope between the two probe points
probe_log_br, probe_log_br2 log10 of probe bitrates

Sources

~40,861 unique (segment, codec, resolution) cells from ~9,000 source clips: Blender Open Movies, Internet Archive public-domain films, NASA SVS, Wikimedia Commons, Pexels/Pixabay/Coverr/Mixkit stock, Xiph.org test media, YouTube CC. All sources are openly licensed.

Citation

If you use this dataset, please link the repo.

License

CC0-1.0 (public domain dedication). Feature aggregates and measurements computed by the authors from openly licensed sources; no video content is included.