[FFmpeg-devel] [PATCH] fix for roundup issue 2470

[Daniel Kang]

I am a Google Code-In student, and as part of a task, I have used zzuf
to generate a file that crashes ffmpeg. The issue is caused by invalid
y4m headers, causing a divide by zero error. The roundup issue is 2470.

I have attached a patch to fix this issue. It fixes the sanity check for
y4m invalid time stamps. Are there any comments?
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