{ "source_video_id": "5127fc37e55090d37fa8cf20bb590aef", "source_url": "https://ugchdrmturk.s3.us-east-2.amazonaws.com/videos/5127fc37e55090d37fa8cf20bb590aef.mp4", "source_sha256": "b530301bcc01bc1ee7eba41988b525b788719a48ba0eb6988d6a1a1346d5bf55", "sdr_sha256": "6f4a310a2a8142ea297cc7bd9951b1cb2b147a9d385cede383453d42b13fad41", "source_signal": { "codec": "HEVC Main10", "pixel_format": "yuv420p10le", "size": [ 1920, 1080 ], "fps": 30, "primaries": "BT.2020", "transfer": "ST2084 PQ", "matrix": "BT.2020 nonconstant luminance", "range": "limited 10-bit" }, "sdr_signal": { "codec": "H264/libx264 CRF16 preset fast", "pixel_format": "yuv420p", "size": [ 1920, 1080 ], "fps": 30, "duration_seconds": 6, "frame_count": 180, "primaries": "BT.709", "transfer_tag": "BT.709", "matrix": "BT.709", "range": "limited 8-bit" }, "tone_mapping": "Fixed global Reinhard luminance shoulder Ld=100*L/(L+100), input/output in cd/m\u00b2. Applied identically to all frames. Not a learned reconstruction.", "gamut_mapping": "Linear BT.2020 to XYZ to BT.709; reduce chroma toward equal-channel neutral at fixed luminance until all channels lie in [0,100] cd/m\u00b2.", "SDR_mastering_and_analysis": "Ideal zero-black BT.1886 EOTF,100 cd/m\u00b2 white, gamma2.4; encoder applies its inverse. Actual SDR file is decoded again for every reported sample/statistic. Clamp reconstructed SDR nonlinear RGB to [0,1] before the bounded-display EOTF; pre-clamp overshoot fractions are recorded.", "PQ_analysis": "ST2084 EOTF to absolute display-referred RGB components, followed by BT.2020 RGB-to-XYZ. Negative reconstructed nonlinear RGB is clipped to zero; positive overshoot preserved. Fractions recorded below.", "chroma_reconstruction": "Nearest-neighbor 2x2 replication of each native 4:2:0 chroma sample in both encoded files; SDR production downsamples nonlinear chroma with 2x2 box average.", "roi_normalized_xywh": [ 0.05, 0.1, 0.6, 0.6 ], "roi_pixels_xyxy": [ 96, 108, 1248, 756 ], "point_grid": [ 24, 16 ], "peak_marker": "Separate diamond marks maximum-Y pixel in the full ROI, with exact pixel coordinates recorded. It is not a representative grid sample.", "point_exclusion": "Y<0.1 cd/m\u00b2 excluded because near-black chromaticity is unstable. Counts per frame recorded.", "point_color_preview": "Shared Reinhard Y/(Y+100), BT.709 conversion, clamp and sRGB encoding, for dot colors only.", "sample_rate_fps": 5, "sample_pairs": 30, "times": [ 0.0, 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0, 2.2, 2.4, 2.6, 2.8, 3.0, 3.2, 3.4, 3.6, 3.8, 4.0, 4.2, 4.4, 4.6, 4.8, 5.0, 5.2, 5.4, 5.6, 5.8 ], "reference_display_note": "PQ values and SDR100nit/zero-black reference are signal calculations, not measurements of the browser/display. SDR is one documented rendering choice; it is not the only valid tone map and this comparison does not establish quality differences.", "software": { "PyAV": "17.1.0", "FFmpeg_libraries": { "libavutil": [ 60, 26, 101 ], "libavcodec": [ 62, 28, 101 ], "libavformat": [ 62, 12, 101 ], "libavdevice": [ 62, 3, 101 ], "libavfilter": [ 11, 14, 101 ], "libswscale": [ 9, 5, 101 ], "libswresample": [ 6, 3, 101 ] }, "generator": "dataset-video.py", "measurement": "river-data.py" }, "data": [ { "time": 0.0, "frame_index": 0, "sdr": { "minimum": 4.103268978283188e-05, "p50": 61.59, "p95": 86.35, "maximum": 91.47575766748363, "fraction_outside_BT709": 0.0, "fraction_above_100_nits": 0.0, "negative_nonlinear_RGB_fraction": 0.00048761145404663925, "above_one_nonlinear_RGB_fraction": 0.2944556970164609, "point_count": 383, "peak_pixel_xy": [ 344, 460 ], "peakPoint": [ 0.31122, 0.32075, 91.476, "#bbb6bd" ] }, "hdr": { "minimum": 0.0, "p50": 160.54, "p95": 621.16, "maximum": 963.1521380657426, 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