Rust reimplementation of derive.
cargo run --release -- \
--bounds '34.205911 -119.009399 33.709276 -118.026123' \
--width 2000 \
--output heatmap.png \
--ppm-stream \
--frame-rate 1950 \
~/Downloads/strava-data-dump/ \
| ffmpeg -i - -y heatmap.mp4
