avformat/matroskadec: Check duration
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 Reviewed-by:Andreas Rheinhardt <andreas.rheinhardt@outlook.com> Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc> (cherry picked from commit 36680078) Signed-off-by:
Michael Niedermayer <michael@niedermayer.cc>
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