sox sample

sox_sample.txt

Samples read:            484181
Length (seconds):     21.958322
Scaled by:         2147483647.0
Maximum amplitude:     0.859467
Minimum amplitude:    -0.903442
Midline amplitude:    -0.021988
Mean    norm:          0.056249
Mean    amplitude:    -0.000458
RMS     amplitude:     0.101440
Maximum delta:         0.790161
Minimum delta:         0.000000
Mean    delta:         0.015871
RMS     delta:         0.028693
Rough   frequency:          992
Volume adjustment:        1.107

$ cat sound.wav | sox -t wav - -n stat 2>&1 | gsed -n -r 's/RMS[ ]+amplitude:[ ]+(.*)$/\1/p'
0.101440

# probar ffmpeg -i input.mov -acodec copy -vn -f adts -strict -2 -