FFMPEG Help

Hi,

I know this may not be the proper place to post this, but I’m having difficulty in the timing of image capturing with FFMpeg.

All I would like to do is capture a single image for either every 30 seconds or 1 minute of a video. The parameters -r and -vframes are not working as I thought from the documentation I found for FFMpeg.

Does anyone have any proven examples of capturing a single image for every 30 seconds of a video? I either end up with an image for every frame or an image for every 4 seconds.

Thanks,
Kevin