[OSM-talk] Continuous audio in JOSM on tracks without waypoints

[John McKerrell]

Yes, this sounds great. I don't tend to log explicit waypoints so  
this is going to be much more useful for me. Did you think about  
having a little arrow or some sort of marker that followed the trace  
as you played the audio or is there some specific reason that this  
would not be possible?

John

On 20 Feb 2008, at 19:17, 80n wrote:

> David
> This sounds like it will be super cool (sorry about the pun).  I'll  
> be trying this out on my next expedition.
>
> Etienne
>
> On Wed, Feb 20, 2008 at 6:16 PM, David Earl  
> <david at frankieandshadow.com> wrote:
> To augment continuous audio synchronized with waypoints that I mailed
> about earlier this week, I have now also added the facility to work  
> with
> continuous audio recordings on tracks where you don't have or don't  
> want
> to use explicit GPS waypoints. This will be in tomorrow's JOSM build.
>
> After loading your GPX track, right click on the GPX layer and choose
> the new "Make Sampled Audio Layer" option. This will ask for your WAV
> file; then it will create a new layer combining the audio track  
> with the
> GPX trackpoints to produce a set of audio markers laid out along the
> track. These will be at least 15 seconds and 75 metres apart, or
> whatever values you choose for these in Advanced Preferences settings
> for "marker.audiosampleminsecs" and "marker.audiosampleminmetres"
> respectively)(*).
>
> You're then in a similar position to applying audio to explicit
> waypoints as per my previous changes: you can synchronise to a marker
> near the beginning of the track, play by reference to the visual
> position on the map, jump forward and back in the commentary, pause  
> and
> resume and so on.
>
> The sampled markers are named according to the time offset from the
> beginning of the sound track (e.g. "1:37", "1:09:07"). To facilitate
> this, I've reversed the default for whether to show text for button
> markers (audio, image and web), but you can turn these off as before,
> transiently from the right button layer menu, or permanently by  
> setting
> marker.buttonlabels to false in Advanced Preferences.
>
> David
>
>
> (*) the defaults are chosen so that they are about the same for a
> cyclist travelling at 5 metres per second (about 11mph or 18km/h), so
> you get a useful but not overwhelming number of samples, but if you  
> stop
> or slow down, you don't suddenly get a concentration of points close
> together. Of course if you stop and then record intermittently, you'll
> still find it hard to locate the bit of commentary you want - the  
> whole
> idea is it is related to landmark junctions or loops you make in the
> road or whatever. If you're in a car you might want to set the sample
> time a bit shorter, say 7.5 in an urban environment, though the  
> distance
> would probably be the same unless you actually want a higher or lower
> density, and maybe 60 to 90 seconds apart if walking at a typical 1  
> m/s.
>
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