issue_types.json

{
  "suite_version": "video_inconsistency_v2",
  "time_convention": "Frame i covers [i/fps, (i+1)/fps). A span over frames s..e inclusive has start_time = s/fps and end_time = (e+1)/fps; a point event (dropped_frames) at the cut before frame k has start_time == end_time == k/fps.",
  "issue_types": [
    {
      "name": "frozen_frames",
      "category": "temporal",
      "spatial": false,
      "point_event": false,
      "description": "Motion stops: the same frame is held for a run of frames, then motion resumes with a jump."
    },
    {
      "name": "dropped_frames",
      "category": "temporal",
      "spatial": false,
      "point_event": true,
      "description": "A run of frames was cut out mid-shot, so objects and the camera jump forward instantly. Reported at the cut."
    },
    {
      "name": "reversed_segment",
      "category": "temporal",
      "spatial": false,
      "point_event": false,
      "description": "A segment plays backwards: motion runs in reverse, then snaps forward."
    },
    {
      "name": "spliced_footage",
      "category": "temporal",
      "spatial": false,
      "point_event": false,
      "description": "Frames from an unrelated shot are inserted into the middle of a continuous shot."
    },
    {
      "name": "color_grade_jump",
      "category": "appearance",
      "spatial": false,
      "point_event": false,
      "description": "The colour grade / white balance changes abruptly for a segment and then changes back."
    },
    {
      "name": "exposure_flicker",
      "category": "appearance",
      "spatial": false,
      "point_event": false,
      "description": "One to three frames are much brighter or darker than their neighbours."
    },
    {
      "name": "mirrored_segment",
      "category": "geometric",
      "spatial": false,
      "point_event": false,
      "description": "A segment is horizontally flipped, so the scene's layout swaps sides."
    },
    {
      "name": "zoom_jump",
      "category": "geometric",
      "spatial": false,
      "point_event": false,
      "description": "A segment is abruptly punched in (cropped and scaled up), then snaps back to the original framing."
    },
    {
      "name": "inserted_object",
      "category": "spatial",
      "spatial": true,
      "point_event": false,
      "description": "A foreign object is pasted into the frame; it pops in and out abruptly and does not interact with the scene."
    },
    {
      "name": "blurred_region",
      "category": "spatial",
      "spatial": true,
      "point_event": false,
      "description": "A rectangular region is blurred or pixelated for a segment, as if retouched or censored."
    }
  ],
  "decoy_types": [
    {
      "name": "scene_cut",
      "description": "The shot changes to a different scene for good (an ordinary cut, not an inserted fragment)."
    },
    {
      "name": "exposure_drift",
      "description": "Brightness drifts smoothly up or down over a stretch (auto-exposure, a passing cloud)."
    },
    {
      "name": "white_balance_drift",
      "description": "The colour cast drifts smoothly over a stretch (auto white balance catching up)."
    },
    {
      "name": "smooth_zoom",
      "description": "The camera zooms in or out gradually (a normal push-in or pull-out)."
    },
    {
      "name": "object_enters",
      "description": "An object moves into the frame from outside, following the scene's motion."
    },
    {
      "name": "object_exits",
      "description": "An object moves out of the frame, following the scene's motion."
    },
    {
      "name": "object_stops",
      "description": "An object comes to rest while the rest of the scene keeps moving."
    },
    {
      "name": "camera_stops",
      "description": "The camera pan slows to a halt and holds still (natural, gradual deceleration)."
    },
    {
      "name": "illumination_flicker",
      "description": ""
    },
    {
      "name": "auto_exposure_step",
      "description": ""
    },
    {
      "name": "auto_white_balance_step",
      "description": ""
    },
    {
      "name": "fast_zoom",
      "description": ""
    },
    {
      "name": "camera_direction_change",
      "description": ""
    },
    {
      "name": "camera_speed_change",
      "description": ""
    }
  ]
}