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avcodec/mpeg4videoenc: Use 64 bit for times in mpeg4_encode_gop_header()
Fixes truncation Fixes Assertion n <= 31 && value < (1U << n) failed at libavcodec/put_bits.h:169 Fixes: ffmpeg_crash_2.avi Found-by: Thuan Pham <thuanpv@comp.nus.edu.sg>, Marcel Böhme, Andrew Santosa and Alexandru RazvanCaciulescu with AFLSmart Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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This is CVE-2018-12458