Subject: Re: [linux-audio-user] Invert And Mix
From: Alex Timmer (mijn_troep_AT_yahoo.com)
Date: Mon Aug 25 2003 - 15:11:24 EEST
--- Steve Harris <S.W.Harris_AT_ecs.soton.ac.uk> wrote: > On Sun, Aug
24, 2003 at 11:03:43 -0700, Mark Knecht wrote:
> > Presumably if one file had a few seconds of silence at the
> start of
> > end I could just delete that by hand in vi? I don't know how far
> off in
> > lines diff can handle looking for a first match, but a few
> seconds could
> > end up being 100K lines...
>
> I think diff would handle it fine, it doesn't have much choice, but
> you would get bored paging through all those zeros.
>
> I guess an easy fix would be to crunch up all the 0.0's so that
> instead of
> 0.0 0.0
> 0.0 0.0
> ...
> 40000 times
>
> you got
> 0.0 0.0 40000
>
> (run length encoding) so diff would just sho the difference in the
> numer, rather than listing all the lines. It would be a trivial
> awk script I think, an exercise for the reader :)
>
> - Steve
hi,
you could pipe the diff output to 'uniq -c' command here?... with the
-c parameter it counts the input (see manpage). example:
[12] HOME> cat > uneek1
0
0
0
0
0
0
0
0
0
0
1
2
3
[13] HOME> cat > uneek2
1
2
3
[14] HOME> diff uneek1 uneek2
1,10d0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
< 0
[15] HOME> diff uneek1 uneek2 |uniq -c
1 1,10d0
10 < 0
a perfect match (with only a starting silence in one of the files)
should result in only one line of counted zero's in the uniq's
results. i think. =)
gr, ALEX
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