Ed pointed out that the create pngwalk facility fails when you use an events file with minute-long events but the template is daily, then daily files would be produced.
Also there's the problem that when a minutely template is used, then the names are generated automatically, and it will stop at 20000 files.
Also there's the problem that when a minutely template is used, then the names are generated automatically, and it will stop at 20000 files.