Preparing a new play it slowly release

[29a]

Hi Guys,

I'm currently preparing a new release of my application play it slowly.
Play it slowly is a software to play back audio files at a different speed or pitch. You can find out more about it here:
http://29a.ch/playitslowly/

The most recent sourcecode is on github:
http://github.com/jwagner/playitslowly

Can you think of any feature that you'd like to see in the next release? And more importantly does the git version work for you?

Thanks,
Jonas

[raboof]

On debian, i had to install 'python-simplejson' first.

Seems to be fully functional. When i manipulate the 'speed' while playing, the 'position' slider also moves - that doesn't seem right: I'd say it should change speed but not location.

As for features, some things I could dream up:
- toggle between play/pause with the spacebar (even if the focus is on some other element)
- allow controlling the transport from other application (either through midi or jack transport)
- allow placing and jumping to markers and loop points (beyond the existing start/end positions)

[29a]

Hi Raboof,

Thanks for the feedback. The thing with the speed and the position slider is as far as I know a problem of gstreamer. It seems to report wrong position values when the speed changes during playback. I found a hack to work arround this but it introduces stuttering in return. I'll try to find a better solution tomorrow. I tried to find a way to get notified about the jack 'playback' events, but I couldn't find any API for it.

Thanks again,
Jonas

[Pablo]

Nice app!

I have reinstalled it, from the git version. It works.

I have tried changing speed and location doesn't change. It does change the location slider position, to match the new lenght of the song. I don't see why this is not correct.

alt + p and alt + e (play and rewind according to the README) don't work here.

This app is simple and effective. I like it. It plays through jack, stable and OOTB.

Thank you very much!

Pablo

[raboof]

I tried to find a way to get notified about the jack 'playback' events, but I couldn't find any API for it.

The API for this is called the 'JACK Transport' API, and it looks like pyjack supports it.

I have tried changing speed and location doesn't change. It does change the location slider position, to match the new lenght of the song. I don't see why this is not correct.

If you're at the 30th second of a 86-second song, and you double the tempo, then you're at the 15th second of a 43-second song - the location slider location should not change (30/86 = 15/43).

[Pablo]

If you're at the 30th second of a 86-second song, and you double the tempo, then you're at the 15th second of a 43-second song - the location slider location should not change (30/86 = 15/43).

Yes, you are right.

[29a]

Ok I have improved the workaround a bit more so it's now basically ok, but the stuttering is still a bit annoying.

Regarding simplejson, you need it only when you are still using python 2.5 almost two years after 2.6 was released this is also stated in the manual.

Pablo, it's weird that the shortcuts aren't working for you. Are the P on the Play button and the e on rEwind marked with an undersore? Are you using gnome or kde?

Regarding the jack transport api, I consider this for another release. I would surely be useful for keeping play it slowly in sync with ardour or hydrogen, but it needs some thought on it. Just using pyjack probably won't work well together with gstreamer.

Thanks again,
Jonas