Protocols (identical to the paper's meta-benchmark runs; exp/analysis/meta/meta_runner.py)
VIDEO (video1fps)
Frames: one frame per second of the timeline, at most 512 frames per item (uniform subsample beyond; the normalized store holds at most 1,024 frames per video), each frame resized to short side 224. When a model's context or memory rejects the request the frame count is halved and the request retried; the frames actually sent are recorded per item.
Prompt (frames first, then the text): These are {n} frames sampled from a video, in order. Answer the multiple-choice question about the video. Question: {question} Options: A. ... B. ... Answer with the option's letter from the given choices directly.
BLIND
Question and options only, no frames; four option permutations per item (seed 42, exp/analysis/meta/meta_runner.py permutations_for); the blind score is the mean over the four permutations.
Scoring
The rule scorer of the paper (exp/pipeline/scoring.py, mode "list"): the first option letter in the reply, or the option whose text the reply repeats; a reply that names no option is wrong. Gain = VIDEO - BLIND on the same items.