[FFmpeg-user] Frames at a particular (interval) distance

[Tom Evans]

On Tue, Mar 18, 2014 at 2:57 PM, oana1404 <oana.inel at gmail.com> wrote:
> Hi,
>
> I'm trying to extract key frames from a video using the following option:
> eq(pict_type\,I). However, there are lot of keyframes, and I wouldn't want
> to get all of them. Thus, I've been thinking to get the timestamps only for
> keyframes at a difference between 50 and 60 seconds. Is there a way to do
> that?

Yes, as listed in the docs for the select filter:

Select only I frames contained in the 10-20 time interval:


select=between(t\,10\,20)*eq(pict_type\,I)

http://ffmpeg.org/ffmpeg-filters.html#select_002c-aselect

Cheers

Tom