[FFmpeg-user] keeping one frame for 3

[lorenzo angeli]

Hi , I'm trying to have one still frame and an image sequence clip joined
with concat.
It seems to be working fine, but I'm not sure how to make the still image
lasting 3 frames. at the moment I'm using :

ffmpeg -loop 1 -t 1 -i <input image> -i <input>.%4d.<ext> --filter_complex
"[in]....[out]" ..... out.mov

What's the correct flag to set so the first input image stays for 3 frames
rather than 25 sec ?
Thanks
L.

P.s
Sorry if this question has already been asked before but I couldn't find
references.


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