Hi Jan,
I expected it to start with silence and was just checking, however Bobs
file does _not_ start with silence, although he claimed to pad 10
seconds at the beginning. That's why I wanted to know the actual command
in use.
cheers, Erich
On 24.09.2016 17:41, Jan Stary wrote:
> On Sep 24 07:06:23, erich@xxxxxxxxxx wrote:
>> Hi Bob,
>>
>> can you post the command you used to generate that file?
>> It is indeed not "silent" at the beginning:
>>
>>> sox sound77.wav -n trim 0 9 stats
>>
>> DC offset -0.000002
>> Min level -0.007812
>> Max level 0.007812
>> Pk lev dB -42.14
>> RMS lev dB -48.17
>> RMS Pk dB -47.83
>> RMS Tr dB -48.64
>> Crest factor 2.00
>> Flat factor 2.17
>> Pk count 99.0k
>> Bit-depth 1/8
>> Num samples 397k
>> Length s 9.000
>> Scale max 1.000000
>> Window s 0.050
>>
>> However, if I do a pad:
>>
>>> sox sound77.wav test.wav pad 10
>
> The manpage says
>
> pad { length[@position(=)] }
> [...]
> position is optional for the first and last lengths specified
> and if omitted correspond to the beginning and the end of
> the audio respectively.
>
> So if I am reading this right, you are padding
> with 10 seconds of silence at the beginning.
>
> Then in particular the first 9 seconds is silence:
>
>> and analyze the result, it's silent:
>>
>>> sox test.wav -n trim 0 9 stats
>> DC offset 0.000000
>> Min level 0.000000
>> Max level 0.000000
>> Pk lev dB -inf
>> RMS lev dB -inf
>> RMS Pk dB -inf
>> RMS Tr dB -inf
>> Crest factor 1.00
>> Flat factor 111.97
>> Pk count 794k
>> Bit-depth 0/0
>> Num samples 397k
>> Length s 9.000
>> Scale max 1.000000
>> Window s 0.050
>
> Jan
>
>
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