> For video codec H.264 there are two parameters:
> Framerate (e.g. 25 or 30 or 29,97)
> keyframe interval (I guess measured in seconds after the last keyframe
> .e.g 50 or 200):
> What are the corresponding cmdline parameters for ffmpeg?
> How can I tell ffmpeg to use the same values as the input?
FFmpeg will use the same framerate as the input stream, unless the user
overrides it, using `-r` or `fps` or a few other filters
Usually there is no point in mimicking the source keyframe placement. The
encoder will place keyframes as is optimal. But if you insist, add
`-force_key_frames source`. You can also force a fixed keyframe interval
using `-g N` where N is measured in frames (not seconds).