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

[oana1404]

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?
For example, if the timestamps are the following:  
t:18.320000
t:24.160000
t:35.880000
t:37.800000
t:47.040000
t:52.840000
t:55.840000
t:64.200000
t:66.080000
t:77.720000
t:80.320000
 I would like to have only t:52.840000. 
Thank you!




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