Fixes: Timeout
Fixes: 2006/clusterfuzz-testcase-minimized-5766515037044736

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpegSigned-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit eb504922)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>