Chef plating a dish: degraded input
The input a super-resolution tool is given: the published clip /files/video/comfy-realism-v1/kitchen-chef.mp4 reduced from 640x480 to 160x120 by an exact 4x area downscale, over all 49 frames at 24.0 fps. Because the reduction is an exact integer factor of a clip that is already in this catalogue, anything a tool produces from this file can be MEASURED against the original rather than judged by eye. For reference, a plain bicubic enlargement back to 640x480 scores 27.165 dB PSNR and 0.861 SSIM against that original - the number any model has to beat to be worth running.
Browser-playable test video · 2.042 seconds
Specifications
- Frames
- 49
- Fps
- 24
- Scale
- 4
- Downscale Method
- area
- Ground Truth
- /files/video/comfy-realism-v1/kitchen-chef.mp4
- Ground Truth Width
- 640
- Ground Truth Height
- 480
- Synthetic
- true
- Disclosure
- Derived from an AI-generated clip already in this catalogue. Synthetic, not real footage.
- Schema Version
- 1
- Role
- source
- Width
- 160
- Height
- 120
Testing contract
Expected to pass- Scenario
- Enlarge this clip back to the ground truth's resolution with whatever upscaler is under test, then measure PSNR and SSIM against that published clip.
- Expected result
- It is 160x120, an exact 4x area reduction of /files/video/comfy-realism-v1/kitchen-chef.mp4 over all 49 frames. Because the factor is exact and the source is already in this catalogue, the output can be MEASURED rather than judged by eye. A plain bicubic enlargement scores its recorded dB here, which is the number a model has to beat to be worth running.
What is a .mp4 file?
MP4 (MPEG-4 Part 14) is the dominant container for digital video, holding video, audio, subtitle, and metadata tracks in a tree of typed boxes. `ftyp` declares the brand, `moov` carries the sample tables that make seeking possible, and `mdat` holds the media; when an encoder writes `moov` last, playback cannot begin until the file has fully downloaded, which a faststart remux fixes. It derives from Apple's QuickTime format, generalized by ISO into the ISOBMFF base that MOV, 3GP, and HEIF share.
How to use this file
Use an example MP4 to test box parsing and track detection, seeking, range-request streaming, and transcode or thumbnail pipelines: verifying that a file with a trailing `moov` box is still handled, and that codec support is checked per track rather than inferred from the extension.
How to use this file for testing
“Chef plating a dish: degraded input” is a deterministic Novus Examples fixture for Video upscaling, Super-resolution. Low-resolution clips produced from a documented high-quality source by a recorded filter, so super-resolution output can be measured against the original rather than judged by eye.
Documented properties for this file: 160×120 · source · 24 fps. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.
Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such, expect parsers to fail loudly rather than silently accept them.
Media fixtures are short and synthetic by design. Prefer waveform or transcript ground truth in the same group when measuring ASR, trim, upscale, or sync tools; do not assume broadcast-quality masters.
Code examples
<video controls preload="metadata" width="640" src="kitchen-chef-small.mp4"></video>Related files
- mp4Articulated lorry at a loading bay: degraded inputThe input a super-resolution tool is given: the published clip /files/video/comfy-realism-v1/truck-depot.mp4 reduced from 640x480 to 160x120 by an exact 4x area downscale, over all 49 frames at 24.0 fps. Because the reduction is an exact integer factor of a clip that is already in this catalogue, anything a tool produces from this file can be MEASURED against the original rather than judged by eye. For reference, a plain bicubic enlargement back to 640x480 scores 24.913 dB PSNR and 0.793 SSIM against that original - the number any model has to beat to be worth running.
- mp4Articulated lorry at a loading bay: restored by Real-ESRGANThe 160x120 input in this group restored to 640x480 by Real-ESRGAN x4plus (BSD-3-Clause), frame for frame with all 49 frames intact, so it compares directly against the published ground truth /files/video/comfy-realism-v1/truck-depot.mp4. Measured with ffmpeg's own filters it scores 25.299 dB PSNR and 0.842 SSIM; the same degraded input enlarged by plain bicubic scores 24.913 dB and 0.793, so it beats bicubic on both, by +0.39 dB and +0.0490 SSIM. Both figures are measurements against the same original, which is what makes them comparable at all.
- mp4Barista at the espresso machine: degraded inputThe input a super-resolution tool is given: the published clip /files/video/comfy-realism-v1/cafe-barista.mp4 reduced from 640x480 to 160x120 by an exact 4x area downscale, over all 49 frames at 24.0 fps. Because the reduction is an exact integer factor of a clip that is already in this catalogue, anything a tool produces from this file can be MEASURED against the original rather than judged by eye. For reference, a plain bicubic enlargement back to 640x480 scores 30.791 dB PSNR and 0.911 SSIM against that original - the number any model has to beat to be worth running.
- mp4Barista at the espresso machine: restored by Real-ESRGANThe 160x120 input in this group restored to 640x480 by Real-ESRGAN x4plus (BSD-3-Clause), frame for frame with all 49 frames intact, so it compares directly against the published ground truth /files/video/comfy-realism-v1/cafe-barista.mp4. Measured with ffmpeg's own filters it scores 30.639 dB PSNR and 0.941 SSIM; the same degraded input enlarged by plain bicubic scores 30.791 dB and 0.911, so the two metrics DISAGREE: -0.15 dB of PSNR against it, +0.0300 of SSIM for it. That is the signature of a perceptual upscaler - it invents texture, which restores structure while moving individual pixels further from the original, and it is why a super-resolution result reported as one number is not reportable. Both figures are measurements against the same original, which is what makes them comparable at all.
- mp4Cat on a windowsill: degraded inputThe input a super-resolution tool is given: the published clip /files/video/comfy-realism-v1/cat-window.mp4 reduced from 640x480 to 160x120 by an exact 4x area downscale, over all 49 frames at 24.0 fps. Because the reduction is an exact integer factor of a clip that is already in this catalogue, anything a tool produces from this file can be MEASURED against the original rather than judged by eye. For reference, a plain bicubic enlargement back to 640x480 scores 32.598 dB PSNR and 0.917 SSIM against that original - the number any model has to beat to be worth running.
- mp4Cat on a windowsill: restored by Real-ESRGANThe 160x120 input in this group restored to 640x480 by Real-ESRGAN x4plus (BSD-3-Clause), frame for frame with all 49 frames intact, so it compares directly against the published ground truth /files/video/comfy-realism-v1/cat-window.mp4. Measured with ffmpeg's own filters it scores 31.398 dB PSNR and 0.932 SSIM; the same degraded input enlarged by plain bicubic scores 32.598 dB and 0.917, so the two metrics DISAGREE: -1.20 dB of PSNR against it, +0.0150 of SSIM for it. That is the signature of a perceptual upscaler - it invents texture, which restores structure while moving individual pixels further from the original, and it is why a super-resolution result reported as one number is not reportable. Both figures are measurements against the same original, which is what makes them comparable at all.
Generated by generation/comfy_upscale_wave.py. Free for any use, no attribution required, license.