Powerdata is not showing

[troflog]

I have powerdata in my gpx file but for some reason It is only shown as zero in the .mov file. Here the format of the gpx:

<trkpt lat="*******" lon="******">
        <ele>183</ele>
        <time>2025-09-28T08:52:07.000Z</time>
        <extensions>
          <gpxtpx:TrackPointExtension>
            <gpxtpx:atemp>8</gpxtpx:atemp>
            <gpxtpx:hr>115</gpxtpx:hr>
            <gpxtpx:cad>28</gpxtpx:cad>
          </gpxtpx:TrackPointExtension>
          <gpxpx:PowerExtension>
            <gpxpx:PowerInWatts>230</gpxpx:PowerInWatts>
          </gpxpx:PowerExtension>
        </extensions>
      </trkpt>

I not found any info on how the gpx xml should look like. Do I need to change my gpx file?

[time4tea]

It looks like your power data is in a different format to the power data that I've previously seen. Ill do a bit of research into the file formats.

[troflog]

It is just a download from Strava. Originally from a Wahoo Roam. But I can try to change it, but need an example of valid format.

I tried with this

  <extensions>
    <power>0</power>
    <gpxtpx:TrackPointExtension>
     <gpxtpx:atemp>13</gpxtpx:atemp>
     <gpxtpx:hr>71</gpxtpx:hr>
     <gpxtpx:cad>0</gpxtpx:cad>
    </gpxtpx:TrackPointExtension>
   </extensions>

And it worked!!!!
The first format was from gpxstudio but know I just used lxml which do not mess up my gpx file. I use this to extract part of gpx file, since I do not need the whole 3 hours file to make overlay. Only interested in specific part.

There is no way to do this when running --use-gpx-only?

[time4tea]

There isn't a way to do just part of a gpx file at the moment... but also there are other easy ways to extract a portion of a file,

Its hard to know how much to build in, as the command line args are already quite intimidating!

Glad this worked for you!

[troflog]

I think I agree with you. It is important to follow the Unix principle and to one thing and one thing well. It is no problem to make a python script wrapping around your excellent tool that extract only part of the gpx file and then make the video.