[FFmpeg-devel] [PATCH 1/1] avcodec/mpegutils: add motion_vec debug mode

[Paul B Mahol]

On Fri, Sep 2, 2022 at 5:12 PM Chema Gonzalez <chema at berkeley.edu> wrote:

> So is there a filter that already dumps this information?
>

Not in text but in visual, note that you can write own code that uses
library to dump MV as text, because MV are exported when certain flag is
enabled.

>
> Thanks,
> -Chema
>
> On Fri, Sep 2, 2022 at 12:56 AM Paul B Mahol <onemda at gmail.com> wrote:
> >
> > On Thu, Sep 1, 2022 at 8:43 PM Chema Gonzalez <chema at berkeley.edu>
> wrote:
> >
> > > Hi Paul,
> > >
> > > Can you please describe how you can get the MV values?
> > >
> >
> > See how filters do it. They visualize MV but using similar logic one
> could
> > dump them to ton of texts.
> >
> >
> >
> > >
> > > Thanks,
> > > -Chema
> > >
> > >
> > > On Thu, Sep 1, 2022 at 10:52 AM Paul B Mahol <onemda at gmail.com> wrote:
> > > >
> > > > On Thu, Sep 1, 2022 at 5:06 PM Chema Gonzalez <chema at berkeley.edu>
> > > wrote:
> > > >
> > > > > Hi,
> > > > >
> > > > > All the other debug modes (qp, skip, mb_type) use the same
> approach.
> > > > >
> > > > >
> > > > This adds to much code for something that is already possible.
> > > >
> > > >
> > > > > -Chema
> > > > >
> > > > >
> > > > > On Thu, Sep 1, 2022 at 6:30 AM Ronald S. Bultje <
> rsbultje at gmail.com>
> > > > > wrote:
> > > > > >
> > > > > > Hi,
> > > > > >
> > > > > > On Wed, Aug 31, 2022 at 7:10 PM Chema Gonzalez <chemag at gmail.com
> >
> > > wrote:
> > > > > >>
> > > > > >> Add a new debug mode ("motion_vec") that prints the values of
> the
> > > > > >> motion vectors (MV).
> > > > > >
> > > > > >
> > > > > > Isn't this super-hacky? In a well-designed system, a codec might
> > > export
> > > > > its MVs using designated structs (which we already have) and then
> use
> > > these
> > > > > structs to print it in a codec-agnostic way using a filter (which
> IIRC
> > > we
> > > > > already have?).
> > > > > >
> > > > > > Ronald
> > > > > _______________________________________________
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