[FFmpeg-devel] [PATCH] Include field_mode information in NUT stream info

[Anders Rein]

Hi! Thanks for the feedback.I have no problem adding the "X-" prefix
to the field order key, however I was just following the way
"r_frame_rate" was passed. As far as I can see this field is not
mentioned in nut.txt either and should also be using the X- prefix. Or
am I missing something?

On Mon, 10 Mar 2025 at 21:19, Michael Niedermayer
<michael at niedermayer.cc> wrote:
>
> Hi
>
> On Mon, Mar 10, 2025 at 05:44:22PM +0100, Anders Rein wrote:
> > This will make it possible to transmit raw video over NUT without losing
> > the field order information.
>
> [...]
>
> > diff --git a/libavformat/nutenc.c b/libavformat/nutenc.c
> > index 55efb114c3..abe4e3fb98 100644
> > --- a/libavformat/nutenc.c
> > +++ b/libavformat/nutenc.c
> > @@ -21,6 +21,7 @@
> >
> >  #include <stdint.h>
> >
> > +#include "libavcodec/defs.h"
> >  #include "libavutil/intreadwrite.h"
> >  #include "libavutil/mathematics.h"
> >  #include "libavutil/mem.h"
> > @@ -560,12 +561,22 @@ static int write_streaminfo(NUTContext *nut, AVIOContext *bc, int stream_id) {
> >              count += add_info(dyn_bc, "Disposition", ff_nut_dispositions[i].str);
> >      }
> >      if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
> > +        const char* field_order;
> >          uint8_t buf[256];
> >          if (st->r_frame_rate.num>0 && st->r_frame_rate.den>0)
> >              snprintf(buf, sizeof(buf), "%d/%d", st->r_frame_rate.num, st->r_frame_rate.den);
> >          else
> >              snprintf(buf, sizeof(buf), "%d/%d", st->avg_frame_rate.num, st->avg_frame_rate.den);
> >          count += add_info(dyn_bc, "r_frame_rate", buf);
> > +
> > +        // Since the NUT specifications (nut.txt) do not support field order information,
> > +        // the stream_info side channel is used as a means to transfer this information.
> > +        // This is strictly not a part of the NUT specifications and should not be required.
> > +        field_order = ff_nut_serialized_field_order_value_or_null(st->codecpar->field_order);
> > +        if (field_order != NULL) {
> > +            count += add_info(dyn_bc, "field_order", field_order);
> > +        }
>
> either send a patch to nut.txt or it should be "X-field_order" for non
> standard fields
>
> thx
>
> [...]
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
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