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Subject: Re: Playback Speed/Pitch

Re: Playback Speed/Pitch

From: Grant Hardy <>
Date: Sat, 6 Jan 2007 12:30:13 -0800

What is this 2% thing? I don't really understand where you'd use it.

----- Original Message -----
From: "Dominik Riebeling" <>
To: "Rockbox" <>
Sent: Saturday, January 06, 2007 12:54 AM
Subject: Re: Playback Speed/Pitch

> On 1/6/07, Alexandre Enkerli <> wrote:
>> Is there any way to increase playback speed (without changing pitch) by
>> more
>> than 2%? If not, is it a hardware limitation?
> It is NOT possible to change the playback speed without affecting the
> pitch (i.e. timestretching) at all. There is no 2% time stretching
> feature in Rockbox, so please stop talking about.
>> podcasts and audiobooks a completely different experience. If it weren't
>> for
>> the 2% limitation, it'd be easy to sell Rockbox devices as the ideal
>> podcast-listening tool (what with bookmarking, etc.).
> Rockbox is an open source project. It's not a product planned in any
> way to sell. If you like it feel free to donate some money to the
> project. So thinking about what would make it better selling is
> completely useless and of no interests to the Rockbox team.
> There is not 2% limitation. The 2% thing is for beat matching and for
> that reason the 2% steps don't stick. It is NOT timestretching. It
> also has the "chipmunk" thing (which might be not that easy to hear at
> 2%).
>> (Using a mid-December Rockbox build on an iRiver H120.)
> When reporting things please make sure to use a current build. Rockbox
> changes pretty fast (at least sometimes), so reporting against a one
> week old build may already be outdated because someone might already
> have implemented / fixed the issue.
> As for your question: real timestretching is a lot more cpu intensive
> than pitching (read: faster playback like Rockbox currently does) and
> nobody has implemented it yet. Feel free to work on it yourself and
> submit a patch. We have feature requests for time stretching (faster
> playback without changing the height of the music tones) and the
> opposite, changing the music tones without affecting the playback
> speed. I'm pretty sure a lot of people would love such a thing.
> - Dominik
Received on 2007-01-06

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