Michael Niedermayer:
> Fixes: -nan is outside the range of representable values of type 'long'
> Fixes: 
> 44614/clusterfuzz-testcase-minimized-ffmpeg_dem_WEBM_DASH_MANIFEST_fuzzer-6216204841254912
> 
> Found-by: continuous fuzzing process 
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
> ---
>  libavformat/matroskadec.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
> index 91f3567692..8f0c53a6bc 100644
> --- a/libavformat/matroskadec.c
> +++ b/libavformat/matroskadec.c
> @@ -3065,6 +3065,8 @@ static int matroska_read_header(AVFormatContext *s)
>  
>      if (!matroska->time_scale)
>          matroska->time_scale = 1000000;
> +    if (isnan(matroska->duration))
> +        matroska->duration = 0;
>      if (matroska->duration)
>          matroska->ctx->duration = matroska->duration * matroska->time_scale *
>                                    1000 / AV_TIME_BASE;

LGTM.

- Andreas
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