ffmpeg or sox cut only speaches

kzo81 · 08-10-2021, 10:13 AM

Hi,

Do you think it is possible to cut out only the speeches from a long radio recording?
I got 1 hour recording but there are some 3-10 second human speech in them.
There is complete silence in between the speeches.
The filename should be 1 second before the speech starts. I was experimenting with ffmpeg and sox.

Thanks,

Zolee

ondoho · 08-10-2021, 10:25 AM

Quote:

Originally Posted by kzo81

I was experimenting with ffmpeg and sox.

Tell us more about that. Also what your web searches revealed.
I am pretty sure cutting silence is possible with at least one of those two, but I'd have to look it up for you to tell you exactly how.

kzo81 · 08-10-2021, 10:52 AM

for instance this:

sox infile.wav outfile.wav silence 1 1 5%

This should trim out the silence which is under 5% noise and 1 second before and after. But when I open the file with audacity its a mess.

or this:

sox infile.wav outfile.wav silence 1 1 5% 1 1 5% : newfile : restart

with the second I dont know how to change the file names to the original starting point

ondoho · 08-10-2021, 10:56 AM

Play with the values?
Also, what's "a mess"?
The sox man page has some examples wrt 'silence', take a deeper look.

kzo81 · 08-10-2021, 11:06 AM

mess means in this context that compared to the original recording there the new trimmed recording has lost all qualities. Not even recognisable...
And I played with the values a lot.

andrew.46 · 08-12-2021, 04:24 AM

FFmpeg has a nice audio filter called 'silenceremove' that would be well worth looking at...

ondoho · 08-13-2021, 01:05 AM

^ +1

Quote:

Originally Posted by kzo81

mess means in this context that compared to the original recording there the new trimmed recording has lost all qualities. Not even recognisable...
And I played with the values a lot.

So you mean it actually does what you want, but the result is of inferior sound quality? Why in dog's name didn't you mention that before? I'm sure sox has settings to avoid this; did you even glance at its man page?