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Is there a way to trim off N samples from audio file using SoX / FFmpeg or the likes of?

Vasyl Shumskyi
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2 Answers2

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Using SoX trim :

sox in.wav out.wav trim 0s 1000s

Trims first 1000 samples with 0 samples offset.

's' here means 'sample', not 'second'. To trim by 'seconds' you should remove 's'

To trim specified range of sample(s): 

sox in.wav out.wav trim 5000s 100s

Trims 100 samples, from 5000 to 5100 (5000s - samples offset, 100s - number of samples to trim after offset)

sox in.wav out.wav trim 123456788s 1s

Trims 123456789-nd sample (123456788s - samples offset, 1s - number of samples to trim after offset)

Vasyl Shumskyi
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2

Use the atrim filter:

ffmpeg -i input -af atrim=start_sample=65614:end_sample=102400 output

  • start_sample - The number of the first sample that should be output.

  • end_sample - The number of the first sample that should be dropped.

llogan
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  • Thanks! Exactly what i needed. Is it possible to combine both of the parameters to get N-th sample with one FFmpeg invocation (let's say 123456789)? I've tried ffmpeg -i input.wav -af atrim=start_sample=123456788 -af atrim=end_sample=123456789 output.wav – Vasyl Shumskyi Oct 02 '16 at 07:21
  • Cool! Thanks @LordNeckbeard – Vasyl Shumskyi Oct 03 '16 at 07:58