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Re: Effects that change duration of a track

From: Eric Wong
Subject: Re: Effects that change duration of a track
Date: Mon, 27 Jan 2020 21:18:38 +0000

James Rowe <address@hidden> wrote:
> Hi,
>   So, you’re laying in bed listening to a podcast with an effect
> that modifies playback length, such as sox’s ``tempo -s 1.9``.  How do
> people deal with dtas-console displaying the “wrong” duration¹?  Or, is
> there a correct way to manage effects that modify track times?

It's a known problem.  dtas-player_effects(7) manpage does warn
against effects which modify track times.

dtas would have to know about which sox effects which could
alter track time, and there's also LADSPA plugins, too...
Things get complicated really fast.

Another solution would be similar to what we do for trim/volume
ReplayGain and expose a parameter/effect which dtas itself will
use to inject "tempo" into the effects chain.  It covers the
majority of cases like yours, I think; but doesn't cover effects
like "splice" or "vad"

> Thanks,
> James
> 1. Laying in bed looking at dtas-console in termux on a phone screen is
>    hard enough without having to do mental arithmetic ;)

Heh.  I just never cared about track times too much when just
listening to what I'm listening to.

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