Re: Starting playback in the middle of a movement

[Richard Shann]

On Wed, 2019-12-11 at 11:46 +0100, Andreas Schneider wrote:
> On 12/11/19 11:09 AM, Richard Shann wrote:
> > On Mon, 2019-12-09 at 20:28 +0100, Andreas Schneider wrote:
> > > On 2019-12-08 21:36, Richard Shann wrote:
> > > > On Sun, 2019-12-08 at 20:51 +0100, Andreas Schneider wrote:
> > > > > When moving the playback start marker away from the beginning
> > > > > of
> > > > > a
> > > > > piece
> > > > > (using the playback control), I encounter the new behaviour
> > > > > that
> > > > > after
> > > > > stating playback it takes quite a while until the actual
> > > > > playback
> > > > > starts, or more precisely it seems that it plays back
> > > > > silently
> > > > > from
> > > > > the
> > > > > beginning of the movement and starts producing sounds when it
> > > > > arrives
> > > > > at
> > > > > the playback start marker. At least I guess that from the
> > > > > time it
> > > > > takes
> > > > > to start playing. I assume that this is a bug?
> > > > 
> > > > I am not seeing that behaviour, and I don't think anything has
> > > > changed
> > > > for a long time in that area of the program. Are you seeing the
> > > > messages announcing the starting and ending of playback on the
> > > > console?
> > > > I just did a few tests
> > > > 
> > > > Denemo - MESSAGE : Starting playback
> > > > Denemo - MESSAGE : Starting playback at 28.005368
> > > > Here endeth a scripted playbackstarting audio playback at
> > > > 56.010664
> > > > Denemo - MESSAGE : Starting playback
> > > > Denemo - MESSAGE : Starting playback at 56.010664
> > > > Here endeth a scripted playbackDenemo - MESSAGE : Using channel
> > > > 0
> > > > prognum 0
> > > > Denemo - MESSAGE : Using channel 1 prognum 0
> > > > starting audio playback at 54.010402
> > > > Denemo - MESSAGE : Starting playback
> > > > Denemo - MESSAGE : Starting playback at 54.010402
> > > > Here endeth a scripted playback
> > > > 
> > > > I was setting the start place via the Playback Control green
> > > > "|"
> > > > button
> > > > but I am getting the same immediate response with Ctrl-F5 and
> > > > with
> > > > Ctrl-Alt-Drag of the start playback marker followed by F5
> > > 
> > > When starting playback, I get the messages
> > > 
> > > Denemo - MESSAGE : Starting playback
> > > Denemo - MESSAGE : Starting playback at 0.000000
> > 
> > Do you get these two promptly when you start playback, or are they
> > delayed until playback actually starts?
> 
> I get these two messages immediately when clicking playback start.
> The
> sound starts considerably later.
> 
> > > independent of where the playback start marker is. Playback ends
> > > with
> > > the message
> > > 
> > > Here endeth a scripted playback
> > 
> > Are you using JACK or Alsa?
> 
> I am using JACK.

Mmm, that's something that I have even less experience with - does it
allow you to ask for messages to indicate when it does things - when it
gets input? Did you upgrade to the latest Debian Stable? I haven't done
that yet, which could account for the difference we are seeing.
This is contingent on the old versions of Denemo showing the same
behaviour (see below).

> 
> > > Do you have a suggestion how to debug?
> > 
> > Are you able easily to run an old version of Denemo to check that
> > it is
> > something external and not some difference within your Denemo
> > binary?
> 
> Yes, I can just install some old Debian packages or build an old
> version. Is there a specific version you have in mind?

Well, I guess the last version you used which didn't show that
behaviour, but you could go a long way back before you would find a
version with different audio source code I think. You do realize you
don't need to install when you have built Denemo? You can execute it
directly from the src directory if you built without a --prefix in the
configure step. An older version would pick up the old .denemo-x.y.z if
you still have it around, otherwise it will create a new one and ignore
later .denemo-x.y.z files.

Richard