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arxiv: 2604.21767 · v1 · submitted 2026-04-23 · 💻 cs.CL · cs.SI

Misinformation Span Detection in Videos via Audio Transcripts

Pith reviewed 2026-05-09 22:03 UTC · model grok-4.3

classification 💻 cs.CL cs.SI
keywords misinformation detectionvideo analysisaudio transcriptsspan detectionnatural language processinglanguage modelsfact checking
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The pith

Audio transcripts let language models locate misinformation to specific video segments at F1 0.68.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper creates two new datasets from over 500 videos containing more than 2,400 annotated segments where fact-checked misinformation claims appear. It transcribes each video's audio into text and trains classifiers on those transcripts to identify the exact spans responsible for the misleading content. Prior work only labeled entire videos as true or false, but this span-level approach supplies the missing detail on which claims drive the misinformation. The method reaches an F1 score of 0.68 using current language models and releases the datasets, transcripts, audio, and videos for further use.

Core claim

By converting video audio to text and labeling the segments that contain verified misinformation claims, two datasets are built that support training models to detect the precise portions of a video responsible for its misleading nature. Classifiers built with state-of-the-art language models applied to these transcripts identify the misinformation spans at an F1 score of 0.68.

What carries the argument

Misinformation span detection on audio transcripts using language-model classifiers trained on annotated video segments.

Load-bearing premise

Human annotations correctly and consistently mark the exact spans that carry misinformation, and transcripts alone contain enough information to detect those claims without visuals or other context.

What would settle it

New independent annotators marking the same videos produce substantially different span boundaries, or models trained on transcripts miss claims that only become clear when the video image is viewed.

Figures

Figures reproduced from arXiv: 2604.21767 by Breno Matos, Fabricio Benevenuto, Rennan C. Lima, Rodrygo L.T. Santos, Savvas Zannettou.

Figure 1
Figure 1. Figure 1: Example of a fact-checked video with pointers to [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Overview of our methodology regarding the BOL4Y dataset [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Monthly sum of misinformation claims. Vertical lines signal important events during Bolsonaro’s administration. [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: Temporal analysis of the performance of our classifiers. [PITH_FULL_IMAGE:figures/full_fig_p009_4.png] view at source ↗
read the original abstract

Online misinformation is one of the most challenging issues lately, yielding severe consequences, including political polarization, attacks on democracy, and public health risks. Misinformation manifests in any platform with a large user base, including online social networks and messaging apps. It permeates all media and content forms, including images, text, audio, and video. Distinctly, video-based misinformation represents a multifaceted challenge for fact-checkers, given the ease with which individuals can record and upload videos on various video-sharing platforms. Previous research efforts investigated detecting video-based misinformation, focusing on whether a video shares misinformation or not on a video level. While this approach is useful, it only provides a limited and non-easily interpretable view of the problem given that it does not provide an additional context of when misinformation occurs within videos and what content (i.e., claims) are responsible for the video's misinformation nature. In this work, we attempt to bridge this research gap by creating two novel datasets that allow us to explore misinformation detection on videos via audio transcripts, focusing on identifying the span of videos that are responsible for the video's misinformation claim (misinformation span detection). We present two new datasets for this task. We transcribe each video's audio to text, identifying the video segment in which the misinformation claims appears, resulting in two datasets of more than 500 videos with over 2,400 segments containing annotated fact-checked claims. Then, we employ classifiers built with state-of-the-art language models, and our results show that we can identify in which part of a video there is misinformation with an F1 score of 0.68. We make publicly available our annotated datasets. We also release all transcripts, audio and videos.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

3 major / 2 minor

Summary. The manuscript introduces the task of misinformation span detection in videos using audio transcripts. It creates two novel datasets from over 500 videos with more than 2,400 annotated segments containing fact-checked claims, transcribes the audio to text, and trains classifiers with state-of-the-art language models to identify the specific spans responsible for misinformation, reporting an F1 score of 0.68. The datasets, transcripts, audio, and videos are released publicly.

Significance. If the central results hold after addressing validation gaps, the work could meaningfully advance fine-grained, interpretable misinformation detection beyond coarse video-level classification by localizing claims within transcripts. The public release of the annotated datasets and associated media is a clear strength that would support reproducibility and follow-on research in computational linguistics and fact-checking.

major comments (3)
  1. [Abstract] Abstract: The abstract states an F1 score of 0.68 but supplies no information on dataset construction details, annotation process, model choices, baselines, or evaluation splits, preventing verification that the numbers support the claim.
  2. [Dataset sections] Dataset sections: The description of annotating fact-checked claims into video segments reports neither inter-annotator agreement nor any details on annotation guidelines, number of annotators, or consistency checks. This is load-bearing because the F1 score interpretation requires the >2,400 segments to constitute reliable ground truth.
  3. [Experiments/Results] Experiments/Results: No ablation or analysis is provided to show that performance derives from transcript features alone rather than visual/contextual cues, leaving the claim that 'audio transcripts alone' suffice untested.
minor comments (2)
  1. [Abstract] Abstract: The sentence 'identifying the span of videos that are responsible for the video's misinformation claim' is repetitive and could be rephrased for clarity.
  2. [Abstract] Abstract: Consider specifying the exact number of videos and segments early in the abstract to give readers immediate scale.

Simulated Author's Rebuttal

3 responses · 0 unresolved

We thank the referee for the detailed and constructive feedback on our manuscript. We address each of the major comments point by point below, indicating the revisions we plan to make to strengthen the paper.

read point-by-point responses
  1. Referee: [Abstract] Abstract: The abstract states an F1 score of 0.68 but supplies no information on dataset construction details, annotation process, model choices, baselines, or evaluation splits, preventing verification that the numbers support the claim.

    Authors: We agree that the abstract could benefit from additional context to support the reported results. In the revised version, we will expand the abstract to briefly mention the dataset construction (two novel datasets from over 500 videos with more than 2,400 annotated segments), the annotation of fact-checked claims, the use of state-of-the-art language models for classification, and the evaluation leading to an F1 score of 0.68. Specific details on baselines and splits will be cross-referenced to the main text. revision: yes

  2. Referee: [Dataset sections] Dataset sections: The description of annotating fact-checked claims into video segments reports neither inter-annotator agreement nor any details on annotation guidelines, number of annotators, or consistency checks. This is load-bearing because the F1 score interpretation requires the >2,400 segments to constitute reliable ground truth.

    Authors: We recognize the critical need for detailed annotation information to ensure the reliability of the ground truth. We will revise the dataset sections to provide more comprehensive details on the annotation process, including the number of annotators, the guidelines followed for mapping fact-checked claims to video segments, and any procedures used to ensure consistency. Inter-annotator agreement was not calculated during the original annotation; we will acknowledge this limitation in the revised manuscript and discuss its implications for the results. revision: partial

  3. Referee: [Experiments/Results] Experiments/Results: No ablation or analysis is provided to show that performance derives from transcript features alone rather than visual/contextual cues, leaving the claim that 'audio transcripts alone' suffice untested.

    Authors: The proposed method and classifiers operate exclusively on the audio transcripts using language models, without incorporating any visual or additional contextual features from the videos. As such, the F1 score of 0.68 is derived solely from transcript-based features. We will update the experiments and results section to explicitly clarify this aspect and include a brief discussion or note to confirm that no visual cues are utilized in the classification process. revision: yes

Circularity Check

0 steps flagged

No circularity in derivation chain

full rationale

The paper describes a conventional supervised learning pipeline: transcribe video audio, have humans annotate misinformation claim spans to create new datasets (>500 videos, >2400 segments), then train language model classifiers on the transcripts to predict spans, reporting an empirical F1 of 0.68. No equations, derivations, or first-principles results are claimed. No self-definitional steps, fitted inputs renamed as predictions, load-bearing self-citations, imported uniqueness theorems, or ansatzes smuggled via citation appear in the provided text. The central result is an out-of-sample performance metric on newly collected external data, making the chain self-contained without reduction to its own inputs.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on the quality of human annotations for spans and the assumption that transcripts suffice for claim detection; no free parameters or invented entities are mentioned.

axioms (1)
  • domain assumption Audio transcripts of videos accurately capture the spoken claims needed for misinformation identification
    The datasets are built by transcribing audio and annotating segments based on those transcripts.

pith-pipeline@v0.9.0 · 5630 in / 1179 out tokens · 42001 ms · 2026-05-09T22:03:00.105884+00:00 · methodology

discussion (0)

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