[FFmpeg-trac] #6570(avfilter:closed): loudnorm filter changes sample rate
FFmpeg
trac at avcodec.org
Tue Aug 15 22:21:49 EEST 2017
#6570: loudnorm filter changes sample rate
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Reporter: slhck | Owner:
Type: defect | Status: closed
Priority: normal | Component: avfilter
Version: git-master | Resolution: invalid
Keywords: loudnorm | Blocked By:
Blocking: | Reproduced by developer: 0
Analyzed by developer: 0 |
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Comment (by slhck):
Okay, I understand now, thanks. Of course it makes sense to avoid
unnecessary resampling. But seeing that multiple users are confused by
this, and that it leads to unplayable files, there should be at least a
sentence in the documentation saying:
“To accurately detect true peaks, the audio stream will be upsampled to
192 kHz.”
One might even consider printing a warning, since no other filter that I
know of will adjust the sample format or stream properties without
explcitly informing the user (e.g., frame rate, pixel size, …):
“Warning: Audio sample rate was automatically changed to 192 kHz.”
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Ticket URL: <https://trac.ffmpeg.org/ticket/6570#comment:2>
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