
Read this: High Efficiency Video Coding - Wikipedia, the free encyclopedia
Summary: Decoded picture buffer size restricted to 6 pictures for the maximum luma picture size of that level. The decoded picture buffer size can increase to a maximum of 16 pictures if the luma picture size of the video is smaller than the maximum luma picture size of that level. If tiles are present they must be at least 64 pixels high and 256 pixels wide with a level specific limit on the number of tiles allowed for each level as well. - en.wikipedia.org
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