[FFmpeg-user] key frame

[Paul B Mahol]

On Fri, Jun 28, 2024 at 1:20 AM Richard Bartczak via ffmpeg-user <
ffmpeg-user at ffmpeg.org> wrote:

>
> Am 28.06.24 um 00:52 schrieb Mark Filipak:
> > On 27/06/2024 17.55, Richard Bartczak via ffmpeg-user wrote:
> >>
> >> Am 27.06.24 um 22:39 schrieb Mark Filipak:
> >>> Hello All,
> >>>
> >>> I'm considering buying professional video software to evaluate and
> >>> analyze FFmpeg trims and splices and for troubleshooting. My objective
> >>> is to improve my edits, and to improve FFmpeg. I'm retired, I have
> >>> plenty of time, I have plenty of money.
> >>>
> >>> From here:
> >>>
> https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/uc_system/design/guides/videodg/vidguide/basics.html
> >>>
> >>>
> >>> "I-frames are also known as key frames because their content is
> >>> independent of any other frames and they can be used as a reference
> >>> for other frames."
> >>>
> >>> If "key frame" is simply another name for an I-frame, why are there
> >>> two names? pdr0 & Balling at trac.ffmpeg.org hint that key frames are
> >>> specific I-frames with specific methods but they don't elaborate and I
> >>> don't want to burden them.
> >>>
> >>> I'd appreciate an explanation of 'key frame', or a link to an existing
> >>> explanation of course. All I can find is keyframe animation, which of
> >>> course is a technique, not an MPEG method.
> >>>
> >>> Thank you,
> >>> Mark.
> >>>
> >
> > Thanks, Gloster. Now I'm going to eliminate everything that has
> > nothing to do with key frame.
> >
> >> Gloster
> >
> > Oh, look at that. There's nothing left. Hahaha.... I just love
> > ffmpeg-user. There's a laugh a minute.
> >
> Laugh a few minutes more :
>
> "An example of interview prediction is shown in Figure 10.18. View 0
> (top) is predicted
> using a hierarchical GOP structure (Chapter 6) using conventional
> H.264/AVC tools. Each
> GOP consists of an I slice or ‘key picture’ followed by seven B slices."
> (Iain E. Richardson - H264 (2nd edition),2010, p. 304).
>
> Iain E. Richardson, refer to
> https://ieeexplore.ieee.org/author/37268555400


Difference between I-frame and key frame is so subtle that is not relevant
for your project.


>
>
> Gloster
>
>
>
>
> _______________________________________________
> ffmpeg-user mailing list
> ffmpeg-user at ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-user
>
> To unsubscribe, visit link above, or email
> ffmpeg-user-request at ffmpeg.org with subject "unsubscribe".
>