Some questions about FFmpegFrameGrabber

[kana-cr]

grabKeyFrame Does GrabKeyFrame capture I-frames in the video?Leafing through some documents did not see the specific explanation, directly look at the source is not intuitive

[saudet]

That's what it's supposed to be doing, yes, but it doesn't work if the video doesn't have any key frames...

[kana-cr]

Thanks for your answer!