Guard against null handler type in MP4File::GenerateTracks#97
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Signed-off-by: Sai Asish Y <say.apm35@gmail.com>
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When generating tracks, the handler type from
trak.mdia.hdlr.handlerTypeis passed directly tostrcmpagainst the hint track type. On a file where that property exists but its string value is null,strcmp(NULL, ...)dereferences a null pointer and crashes. Read the value once and only compare when it is non-null; a null handler type simply falls through to a regular track. Fixes #87.