[FFmpeg-devel] NAN compile error fix patch

[FFmpeg-devel] NAN compile error fix patch

[John Nelson via ffmpeg-devel]

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This is a known issue apparently and been fixed in other places in the code in a similar way - however, there is a check for isnan() in the same file, so perhaps this won't work as well as the other cases.

Thanks,
John

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[FFmpeg-devel] Re: NAN compile error fix patch

[Michael Niedermayer via ffmpeg-devel]

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Hi

On Wed, Dec 03, 2025 at 09:31:58PM +0000, John Nelson via ffmpeg-devel wrote:
> This is a known issue apparently and been fixed in other places in the code in a similar way - however, there is a check for isnan() in the same file, so perhaps this won't work as well as the other cases.
> 
> Thanks,
> John

>  h264_metadata.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 2e8ff4b98142c5df9dad7aa72a6ed7cb7e8d4fb3  /var0001-remove-NAN-from-const-initializer-that-s-causing-com.patch
> From 03c0d37f6c8b0e8dc6f58ec50984c15f54dc6445 Mon Sep 17 00:00:00 2001
> From: John Nelson <jonelson@adobe.com>
> Date: Wed, 3 Dec 2025 13:27:57 -0800
> Subject: [PATCH] remove NAN from const initializer that's causing compile
>  errors in some cases
> 
> ---
>  libavcodec/bsf/h264_metadata.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/libavcodec/bsf/h264_metadata.c b/libavcodec/bsf/h264_metadata.c
> index 477f1b18b6..91a5004b96 100644
> --- a/libavcodec/bsf/h264_metadata.c
> +++ b/libavcodec/bsf/h264_metadata.c
> @@ -590,6 +590,7 @@ static int h264_metadata_init(AVBSFContext *bsf)
>  }
>  
>  #define OFFSET(x) offsetof(H264MetadataContext, x)
> +#define DEFAULT 0.0 //should be NAN but it does not work as it is not a constant in glibc as required by ANSI/ISO C
>  #define FLAGS (AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_BSF_PARAM)
>  static const AVOption h264_metadata_options[] = {
>      BSF_ELEMENT_OPTIONS_PIR("aud", "Access Unit Delimiter NAL units",
> @@ -658,7 +659,7 @@ static const AVOption h264_metadata_options[] = {
>  
>      { "rotate", "Set rotation in display orientation SEI (anticlockwise angle in degrees)",
>          OFFSET(rotate), AV_OPT_TYPE_DOUBLE,
> -        { .dbl = NAN }, -360.0, +360.0, FLAGS },
> +        { .dbl = DEFAULT }, -360.0, +360.0, FLAGS },
>      { "flip", "Set flip in display orientation SEI",

how does this fail to build ?
try to include float.h and math.h

also if this originates from libavutil/mathematics.h, that define NAN
there should be fixed to comply to the standard

thx

[...]

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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

The day soldiers stop bringing you their problems is the day you have stopped 
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