Re: [SoX-users] convert wav to ogg twice produces diffrent binary files

[Jeremy N. - ml s. u. <jn....@wi...>]

On 2017-10-15 19:52, Måns Rullgård wrote:
> Dennis Muratshin <fra...@gm...> writes:
> 
>> for example run these commands:
>> 
>> sox.exe src.wav dest1.ogg -G rate 44100
>> sox.exe src.wav dest2.ogg -G rate 44100
>> 
>> It will produce two files with small difference between them:
>> http://prntscr.com/gxdifd
>> Is there any way to avoid it?
> 
> It could be due to dither.  Try the -R option to use a fixed seed for
> the random number generator.

It's hard to tell from the screenshot how big the files are... but they
look as if they might be tiny.  The line 1 difference might I guess be
a date/time stamp, if the file format allows that.

Then ... do we have just one or two 'frames' (if that's an appropriate
term) of audio?  Might they also have a date/time stamp in them?

I'd have thought a dither difference would affect many bytes in the 
audio
stream, but then again maybe that depends on what the audio in the file
actually is - silence, test tones, real music?

-- 
Jeremy Nicoll - my opinions are my own