[FFmpeg-user] Why is concat so slow on a powerful machine?

[Cley Faye]

2017-10-18 3:17 GMT+02:00 Kevin Duffey <kevinmduffey-at-yahoo.com at ffmpeg.org
>:

> Yup. I do not specify the output. I just use the same .mov file extension
> as the two source files. Is it possible even though I specify -c copy
> out.mov it is rendering and not Concat??
>
>
>
​You really should provide a minimal command line reproducing the issue and
the output of ffmpeg, otherwise it will be impossible to divine what's
happening.

Or, if you want a general answer, no, concat should be fast assuming that
I/O are fast and the output muxer is fast. Without more information it is
hard to say anything more.​