Hey, Michael,
On 04/21/2020 01:55 AM, Michael Koch wrote:
Am 21.04.2020 um 04:09 schrieb Mark Filipak:
Hey,
I have a question for you knowledgeable folks.
I've seen where some use the term "keyframe" but I've never seen a definition. It's not terribly
important, but here goes...
I've assumed -- you know how good I am at that! -- that a keyframe is the I-frame that's at the
beginning of a GOP.
Am I correct?
I think this is correct, see also here:
https://en.wikipedia.org/wiki/Key_frame
Michael
That Wikipedia article implies pretty strongly that all I-frames are keyframes.
The MPEG spec uses the term "keyframe" occasionally, and in a manner that implies that keyframes are
particular I-frames, but then doesn't really resolve the question regarding what quality makes an
I-frame a keyframe. The only thing I could think of was the particular I-frame that begins a GOP.
There's a problem with that: Not all stream formats have GOPs even though the literature about those
formats refer to keyframes. Maybe in those formats, all I-frames are keyframes. ?????
I guess it's like "interlaced", just another video term that has a 'variable'
definition. ;-)
Hopefully, someone else will contribute. For now, there's 2 votes for keyframe
== 1st frame of GOP.
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