i'd think about adding scene change detection to your fixed number of frames extact, lot's of things may happen during 4 secs. i bet you can add this just as an extra filter to that simple mod 240 filter, so everything will be done in 1 pass
On Fri, Jan 25, 2019 at 3:55 PM Dennis Mungai <dmng...@gmail.com> wrote: > On Fri, 25 Jan 2019 at 17:32, Joshua Barnard < > joshua.barn...@lawrencedavid.co.uk> wrote: > > > Hi all, > > > > Thank you for taking the time to read this. > > > > I'm working on a project for my company that involves creating a time > > lapse video. > > > > The issue I'm having is that I have 6TB of raw video recorded at > > 1080p/60FPS and I need to condense this down to 5-10 minutes of video > > footage. > > > > Is it possible to use FFMPEG to create a still image every 240 frames? > > > > Kind Regards, > > > > > > Joshua Barnard > > Group Marketing Manager > > > > > > Lawrence David Limited > > > > > > > > _______________________________________________ > > ffmpeg-user mailing list > > ffmpeg-user@ffmpeg.org > > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > > > To unsubscribe, visit link above, or email > > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > > > Hello there, > > It's possible. > > For a single image every 240 frames, assuming a frame rate of 60, you can > exploit the select filter as shown: > > ffmpeg -i input -filter:v 'select=not(mod(n\,240))' image%02d.png > > To use time-based selection which will also include the first frame: > > ffmpeg -i input -filter:v > 'select=isnan(prev_selected_t)+gte(t-prev_selected_t\,4),setpts=N/(60*TB)' > image%02d.png > > For documentation, see the select and the setpts filters: > > 1. Select: http://ffmpeg.org/ffmpeg-filters.html#select_002c-aselect > > 2. setpts filter: > http://ffmpeg.org/ffmpeg-filters.html#asetpts_002c-setpts > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > http://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
