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

[80n]

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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