Is there a plugin I'm missing that allows me to determine the volume samples over the length of an audio file?
For example, a sample of every second to gain the dB vs timestamp?
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ebur128 filter provides info in terms of the Loudness Recommendation EBU R128 metric.
astats filter can provide this info, in terms of dBs:
ffmpeg -i in.mp3 -af astats=metadata=1:reset=1,ametadata=print:key=lavfi.astats.Overall.RMS_level:file=log.txt -f null -
This produces an output like this:
frame:221 pts:226304 pts_time:4.71467 lavfi.astats.Overall.RMS_level=-67.437152 frame:222 pts:227328 pts_time:4.736 lavfi.astats.Overall.RMS_level=-67.159036 frame:223 pts:228352 pts_time:4.75733 lavfi.astats.Overall.RMS_level=-63.862748 frame:224 pts:229376 pts_time:4.77867 lavfi.astats.Overall.RMS_level=-63.666815
If this is too fine-grained in terms of temporal resolution, increase the reset value which is the frame count for the filter's sampling frequency. For a 1-second slice, an integer approximating
audio sampling rate/1000 should be used.