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GPS Babel maybe. It's not the most user-friendly but very powerful https://www.gpsbabel.org/htmldoc-1.5.4/filter_track.html
aggi-
Thanks, I'll see what happens...
Split by distance.
The input track will be split into several tracks if the distance between successive track points is greater than the distance given as a parameter. The distance must be numeric and can be in miles or kilometers, expressed as one of the character "k", or "m". If sdistance is given no parameters, this option has the same effect as the split option without parameters. If there is more than one track, use the pack option before before using this.
For example, to split the track if the distance between points is greater than 100 meters, use this:
gpsbabel -t -i gpx -f in.gpx -x track,pack,sdistance=0.1k" -o gpx -F out.gpx
The sdistance option can be combined with the split option. The track then will be split only if both time and distance interval exceeds the supplied values. This technique can be used to filter out gaps from the tracklog. The gap is kept only if the gps device is without signal for longer time than that given and during that time it moves a distance over that given. This example splits the track if the device is without signal for at least 5 minutes and during this time moves more than 300 meters:
gpsbabel -t -i gpx -f in.gpx -x track,pack,sdistance=0.3k,split=5m -o gpx -F out.gpx
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Won't split without a time.
" the track filter requires timestamps on all trackpoints"
hippy
I've been using this to split GPX files into smaller 100km chunks, but is there something similar that won't kill the elevation data?
https://simple-gpx.herokuapp.com/