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whisper-base_timestamped broken with chunk_length_s=30 #1358

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bugSomething isn't working
@jozefchutka

Description

@jozefchutka

System Info

transformers.js: 3.6.1

Environment/Platform

  • Website/web-app
  • Browser extension
  • Server-side (e.g., Node.js, Deno, Bun)
  • Desktop app (e.g., Electron)
  • Other (e.g., VSCode extension)

Description

Using chunk_length_s=30 andonnx-community/whisper-base_timestamped produces broken timestamsp

Reproduction

Run the following code and notice the output in console log using the attachedsrc.pcm (in .zip)

<scripttype="module">const{env,pipeline} = await import("https://cdn.jsdelivr.net/npm/@huggingface/transformers@3.6.1/dist/transformers.min.js");env.allowLocalModels = false;const buffer = await (await fetch("src.pcm")).arrayBuffer();const audio = new Float32Array(buffer);const pipe = await pipeline("automatic-speech-recognition","onnx-community/whisper-base_timestamped",{dtype:{encoder_model:"fp32",decoder_model_merged:"q4"},device:"webgpu"});const result = await pipe(audio,{chunk_length_s:30,stride_length_s:5,return_timestamps:"word",language:"en"});console.log(result.chunks.map(chunk =>`${chunk.timestamp[0]} ->${chunk.timestamp[1]}${chunk.text}`))</script>

it prints:

"29.98 -> 29.98  every","29.98 -> 29.98  day","29.98 -> 29.98  style."

Timestamps are invalid and there is also far more speaking.

Changingchunk_length_s to29 fixes the issue and produces rather valid output:

"0 -> 0.42  everyday","0.42 -> 0.86  style.","1.38 -> 1.56  - True","1.56 -> 2  classic","2 -> 2.5  delivers","2.5 -> 3.02  premium","3.02 -> 3.54  essentials","3.54 -> 3.84  built","3.84 -> 4.08  for","4.08 -> 4.42  real","4.42 -> 4.9  life.","5.4 -> 5.64  Grab","5.64 -> 6.04  yours","6.04 -> 6.36  at","6.36 -> 6.86  Target,","7.3 -> 7.78  Costco,","8.28 -> 8.3  or","8.3 -> 8.5  head","8.5 -> 8.7  to","8.7 -> 9.34  TrueClassic","9.34 -> 10.04 .com","10.04 -> 12.28 /p4p.","12.86 -> 13.08  Get","13.08 -> 13.38  hooked","13.38 -> 13.52  up","13.52 -> 13.94  today.","14.16 -> 14.24  Now","14.24 -> 14.46  before","14.46 -> 14.62  we","14.62 -> 14.82  go,","15.1 -> 15.24  just","15.24 -> 15.42  wanna","15.42 -> 15.56  give","15.56 -> 15.68  a","15.68 -> 15.86  big","15.86 -> 16.1  shout","16.1 -> 16.28  out","16.28 -> 16.76  to","16.76 -> 16.9  the","16.9 -> 17.52  CEO","17.52 -> 17.86  and","17.86 -> 18.32  founder,","18.48 -> 18.6  Ryan","18.6 -> 18.92  Frouder,","18.98 -> 19.06  for","19.06 -> 19.22  coming","19.22 -> 19.36  on","19.36 -> 19.5  our","19.5 -> 19.76  show","19.76 -> 20.4  and","20.4 -> 20.6  just","20.6 -> 20.86  showing","20.86 -> 21.08  some","21.08 -> 21.28  love.","21.46 -> 21.62  Now,","21.9 -> 22.36  let's","22.36 -> 22.46  get","22.46 -> 22.7  back","22.7 -> 23.06  to","23.06 -> 23.22  the","23.22 -> 23.54  episode","24.32 -> 24.44  I","24.44 -> 24.6  mean","24.6 -> 25.4  like","25.4 -> 25.52  I","25.52 -> 25.68  said","25.68 -> 26.12  we're","26.12 -> 26.34  going","26.34 -> 26.58  through","26.58 -> 26.82  that","26.82 -> 27.34  we're","27.34 -> 27.56  losing","27.56 -> 28.02  stars","28.02 -> 29.26  and","29.26 -> 29.38  then","29.38 -> 29.56  we","29.56 -> 29.84  kind","29.84 -> 29.98  of"

Why is 30 broken in this case? Is 29 safer in all cases or is it just coincidence?

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