[LAU] [SOLVED] Annoying click in sox + lame pipe

[Lorenzo Sutton]

Well... Sorry to answer my self. I was in such a hurry I wasn't paying 
enough attention to the various switches:

On 20/09/2011 15:29, Lorenzo Sutton wrote:
> I have a sox + lame pipe of this kind:[1][2]
>
> sox sin.mp3 -t wav - trim 10 20 fade t 2 10 2 | lame - -r out.mp3

Indeed the -t wav in sox will produce a wave file, and thus with a 
header, while -r in lame expects raw. So change -t wav to -t raw or 
remove the -r in lame solves the problem:

sox sin.mp3 -t wav - trim 10 20 fade t 2 10 2 | lame - out.mp3

or

sox sin.mp3 -t raw - trim 10 20 fade t 2 10 2 | lame - -r out.mp3

So "the click is the header"...

Sorry again for posting in a rush :)
Lorenzo.

>
> Everything is fine but the final mp3 file[3] always has an annoying
> click at the beginning. This has somewhat to do with the pipe as it
> doesn't happen if I create a wave file from sox. Nor does it happen if I
> use sox only:
>
> sox sin.mp3 out2.mp3 trim 10 15 fade t 2 10 2
>
> Yet the latter needs sox compiled with mp3 support, which is less
> portable than the above.
>
> I'm not sure how to look into this so any suggestion is welcome.
>
> Lorenzo
>
> [1] No I can't use better, non-evil formats this time
> [2] No, I haven't the uncompressed source, so I can only use the mp3 as
> input: life sucks.
> [3] Here: BUT ATTENTION!! There is a click at the beginning so turn
> volume right down: http://lorenzosu.altervista.org/temp/dump/out.mp3 The
> source file here:
> http://lorenzosu.altervista.org/temp/dump/sin.mp3
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