[FFmpeg-user] [N-46469-gc995644] "Invalid duration specification for t: 00:60:00"?

[Gilles]

Hello

I need to slice a video into 60-minute segments.

I googled for it, but still can't get ffmpeg (N-46469-gc995644 from
Nov  5 2012) to slice parts of an MP4 video:

ffmpeg.exe -i input.mp4 -ss 00:00:00 -t 00:60:00 -c:v copy -c:a copy
File1.mp4

"Invalid duration specification for t: 00:60:00"

What am I doing wrong?

Thank you.