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

[David Earl]

On 21/02/2008 23:56, David Earl wrote:
> One thing I realised just cycling along this evening, having stepped 
> back from the project for a while, is that when you don't have a 
> waypoint at the start it is hard to synchronise on a marker, because it 
> they are sampled, not related to any specific point, so to make this 
> truly useful I need to add something to let you adjust or identify the 
> sync point.

What I did in the end (now checked in for tomorrow's build) was to give 
a new operation "Make Audio Marker At Play Head" on the right button 
menu of an audio layer (particularly the artificial one arising from 
"Make Sampled Audio Layer").

You play the audio (typically from the automatically generated marker 
before the landmark where you will synchronise, ignoring what the sound 
track is saying) and pause audio when you see the orange play head arrow 
reach the sync landmark. Then choose "Make Audio Marker At Play Head" 
and it will make you a marker, which you can then choose to synchronise 
with. (You really need to have been moving as you pass the landmark to 
ensure there is no ambiguity as to the time at the location you pause at.)

Synchronise the audio to that new point as before, by playing from that 
new marker, pausing when the audio reaches your "NOW" cue, and choose 
"Synchronize Audio". If your dictaphone was started before the first 
point of the GPS track, you'll need to use the rewind button to step 
back to the sync cue - not play from an earlier marker, as that would 
then sync to that marker, which is not what you want.

Note that you can also use "Make Audio Marker At Play Head" to add 
additional markers in the track, if you want to play the audio more than 
once or twice where the sampling didn't put a convenient marker, or if 
you _are_ using waypoints then at a location where you forgot to mark one.

Additionally, I've set the audio tracing to be on by default (you need 
to see the arrow to make use of the new facility).

David