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In multi-thread case, the encoder may crash if using encoder option tile-rows > 0. To prevent that, force tile-rows=0 in this situation. This is a workaround for WebM issue 1095: https://bugs.chromium.org/p/webm/issues/detail?id=1095 The further fix can be done by adding synchronizations after a tile row is encoded. But this will hurt multi-threaded encoder performance. So, it is recommended to use tile-rows=0 while encoding with threads > 1. Change-Id: I656cbcc200f8d0410d09530e7981ad8f32fe7bc9