[LAU] Glitch when encoding a wav file to mp3 with lame

[Andrea Del Signore]

On Tue, 22 May 2012 13:55:37 -0700, Kevin Cosgrove wrote:

> On 22 May 2012 at 9:46, david
> <gnome at hawaii.rr.com> wrote:
> 
>> On 05/22/2012 04:33 AM, Andrea Del Signore wrote:
>> > I've a little problem encoding an improvvisation I recorded in
>> > ardour2 with lame.
>> >
>> > After exporting sucessfully the two tracks, I run this command:
>> >
>> > lame --preset standard mixdown.wav
>> >
>> > The generated mp3 file is mostly ok, but there are some glitches as
>> > you can ear at 1'37" (mp3 link:
>> > http://persbaglio.it/downloads/improvvisando/risveglio.mp3 )
>> >
>> > I've done this process twice, with the same results and I'm almost
>> > sure that there isn't any glitch in the mixdown wave file (I can't be
>> > really sure just because I don't have the original here at hand).
> 
> I would check that WAV file.  See my comment below.
> 
>> > Any idea on what could be the cause?
>> 
>> Hmmm, try a different MP3 encoder?
> 
> I wasn't paying any attention to this thread until now.
> Yesterday and the day before I exported WAV files from ardour 2.8.11 and
> I noticed that a laugh that's balanced L/R at 6 seconds into the one
> track is also pulled forward to 2 seconds into the track and panned
> nearly all the way left, but slides toward center as it fades out.  The
> WAV file was exported via "Export range markers to multiple audio
> files...".  The problem exists in exports from each of the two days. 
> Only 2-3 of the 21 exported files have any trouble.

The wav is clean, as said in my other response I suspect it's just a 
problem with "windows media player" because nor totem, nor mplayer or vlc 
show the problem on linux

> 
> "Export session to audiofile..." doesn't exhibit the problem.

I used "Export session to audiofile..." for the mixdown.

> 
> Cheerio....

Thanks,
Andrea