[FFmpeg-user] Large Video Project

[Dennis Mungai]

On Fri, 25 Jan 2019 at 17:32, Joshua Barnard <
Joshua.Barnard at 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 at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at 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