On 16-02-2019 05:03 AM, Nick wrote:
Hi,
why was the "Modified force_key_frames option to accept frame numbers"
(2014) declined?
https://ffmpeg.org/pipermail/ffmpeg-devel/2014-November/165167.html
You can even specify frame numbers in the current ffmpeg version using:
-force_key_frames expr:gte(n,n_forced*96)
Using a framerate of 24 means a keyframe every 4s.
I think it is very useful to have something like
/force_key_frames n:0,25,50,75,100/
For a regular pattern like that one, you can already use
-force_key_frames expr:not(mod(n,25))
Expressions are be evaluated using the interface documented at
https://ffmpeg.org/ffmpeg-utils.html#Expression-Evaluation
Gyan
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