Interesting, let us know if you get to the bottom of this.
On Sun, Apr 28, 2013 at 6:40 PM, [email protected] <[email protected]>wrote:
> As usual on these kind of forums, I will answer myself.
>
> It appears this issue is due to Lame. Depending on the type
> of mp3 being generated,Lame will skip n samples at the
> start and end of the pcm data it reads from the source file.
>
> Using Lame 3.99.3 and 3.99.5 alone at the command line
> exhibits this behaviour (though it only introduces 50ms
> of silence at the beginning and chops 30ms from the
> end of the file).
>
> I note however, that Audacity is capable of using Lame to
> encode mp3s without this issue. So an examination of
> the Audacity code is in order, it looks like they have a
> solution or workaround for this issue.
>
>
> Apr 27, 2013 11:16:19 PM, [email protected] wrote:
> >
> >I am trying to manipulate sound files with liquidsoap and have
> >everything pretty much working the way I want it, but...
> >
> >%mp3 and %external encodings are adding around 100ms of silence
> >to the beginning of my output files and cutting about 60ms off the end
> >of the output files.
> >
> >One can test this with the demonstration script "reencoding.liq" and
> >just change the output encoding to %mp3. (%vorbis does not do this)
> >
> >I am running the native win32 builds posted. Both version 1.0.1 and
> >version 1.1.1-beta1 show this behaviour.
> >
> >Is there some setting I have missed that will correct this or have I
> >found a bug? I reviewed the ocaml-lame code but could not see
> >anything obvious... (since the %external encoding also shows this
> >problem the issue must lie elsewhere anyway) Also, setting the
> >clock sync to true has no effect on this, the problem persists
> >- don't know if that info helps any, but I tried it.
> >
> >Actually, when I use lame as an external encoder it still
> >introduces ~100ms of silence at the start of the file, but
> >chops less off the end of the file.
> >
> >Has anyone else encountered this or found a solution for it?
> >
>
>
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