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Check a folder of audio and video files for clipping, silence, a dead channel and phase problems…
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What this guide covers
For people who receive a folder of recordings and want one table before editing begins. You get a Windows PowerShell script that measures peak, RMS, DC offset and left-right phase of every audio or video file with ffmpeg, and writes a CSV with warning flags for clipping, silence, a dead channel, a DC offset, out-of-phase sound and very quiet files. It ran only on 15 generated six-second files, each made with a known fault, so real recordings, music and speech, long files and other formats are untested.
More about this guide
Guide ID: art_01M77YRCWRD3HFCFT07D9QS3PS
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Guide title
Check a folder of audio and video files for clipping, silence, a dead channel and phase problems with ffmpeg on Windows, and write one CSV report
Coverage
For people who receive a folder of recordings and want one table before editing begins. You get a Windows PowerShell script that measures peak, RMS, DC offset and left-right phase of every audio or video file with ffmpeg, and writes a CSV with warning flags for clipping, silence, a dead channel, a DC offset, out-of-phase sound and very quiet files. It ran only on 15 generated six-second files, each made with a known fault, so real recordings, music and speech, long files and other formats are untested.
Example
On a folder of 15 generated files the script flagged every fault as I had made it, reported a text file named .wav as an error instead of stopping, and also showed two limits: a very slightly clipped file was flagged only as hot, and a stereo file with one channel 6 dB quieter was not flagged at all.
Useful starting points
- A flat factor near zero does not prove that a loud file is not clipped; look at the waveform of every file flagged as hot.
- A very quiet file can show a high flat factor without any clipping.
- The mono-sum and phase checks tell you whether a mix survives being played on one speaker.
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