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

[Carl Eugen Hoyos]

Gilles <codecomplete <at> free.fr> writes:

> [C:\]ffmpeg -i input.mp4 -ss 00:59:50 -c:v copy -c:a copy FL.2.mp4

Assuming your question is why the output file is not 
shorter than the input file:
If you put -ss time after -i, it means "decode the input until 
(exactly) time, then start encoding", since -codec copy does 
not do any encoding, the parameter is ignored.

If you put -ss time in front of -i, it means "seek 
(approximately) to time" before doing anything else, 
this (at least to a certain degree) also works with 
-codec copy.

Carl Eugen