[FFmpeg-user] What is the usage for -cgop/+cgop and -g options.

[Hongyi Zhao]

On Fri, Jan 29, 2021 at 11:27 AM "zhilizhao(赵志立)"
<quinkblack at foxmail.com> wrote:
>
>
>
> > On Jan 27, 2021, at 4:26 PM, Hongyi Zhao <hongyi.zhao at gmail.com> wrote:
> >
> > On Wed, Jan 27, 2021 at 10:52 AM pdr0 <pdr0 at shaw.ca> wrote:
> >>
> >> Hongyi Zhao wrote
> >>> I noticed there are -cgop/+cgop and -g options used by ffmpeg. But I
> >>> really can't figure out the usage of them. Any hints will be highly
> >>> appreciated.
> >>
> >> -g is the maximum gop length (the maximum keyframe interval) . Some
> >> codecs/settings have adaptive GOP and I frame placement, but it will never
> >> exceed that value
> >
> > I've tried to search through the whole source code repo and still
> > can't find any definitive explanation about this parameter.
>
> Use `ffmpeg -h full` for quick reference.
>
> For source code, ref. libavcodec//options_table.h

Wonderful notes/hints, thanks a lot.

Best regards,
HY

>
> >
> >> cgop is for specifying closed GOP
> >
> > Same for this one.
> >
> > Best
> > --
> > Assoc. Prof. Hongyi Zhao <hongyi.zhao at gmail.com>
> > Theory and Simulation of Materials
> > Hebei Polytechnic University of Science and Technology engineering
> > NO. 552 North Gangtie Road, Xingtai, China
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-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao at gmail.com>
Theory and Simulation of Materials
Hebei Polytechnic University of Science and Technology engineering
NO. 552 North Gangtie Road, Xingtai, China