[Libav-user] How to control ffmpeg's key-frame generation?

[Stefano Sabatini]

In data Wednesday 2013-01-02 15:30:39 +0900, Quy Pham Sy ha scritto:
> I'm making a segmenter that intervene ffmpeg's write_frame function and
[...]
> Here is my questions:
> 
>    1.
> 
>    is that true that ffmpeg generate keyframes at irregular intervals (and
>    interval time can be up to few second (eg. 6)?

Yes, look for GOP size.

>    2.
> 
>    How can we control the ffmpeg key frame generation? (i guess there
>    should be a ffmpeg command's argument for this, -force_key_frames maybe,
>    but I'm not sure)

-force_key_frames, and check the ffmpeg-devel archive for:
ffmpeg: implement -force_key_frames expression evalution