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David Barker authored
Save bits by not encoding global motion data when there's no previous frame to use as a reference. Use the same logic as for using the previous frame's motion vectors - ie, we don't read global motion information when the current frame is intra-only or when using error-resilient mode. This also fixes an undefined behaviour / segfault bug - see https://bugs.chromium.org/p/aomedia/issues/detail?id=731 for details BUG=aomedia:731 Change-Id: Icca90a1bccafd06de8a4056ca5353318fce416cb
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