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This paper proposes two efficient frame selection methods to improve rate distortion performance and to reduce the computation complexity for frame selection. The proposed Reference Selection Pass (RSP) method can simplify early termination conditions by using the results of the previous coded blocks. The improved frame selection (IFS) method controls the number of reference frames according to the accuracy of frame selection. The simulation results show the proposed methods can eliminate the overhead of early termination conditions with only 0.05 dB average Bjontegaard Delta (BD)-PSNR degradation.