In order to transmit live video or video streaming at low bit-rates, the encoder usually needs to reduce the frame rate to cope with the available bandwidth. In this paper, a new dynamic frame-skipping scheme for live video encoding based on motion detection in the adaptive length sliding window is proposed. The length of a sliding window can be adjusted according to bandwidth variation in order to decide the number of skipped frames. The proposed method considers the characteristic of human visual system and dynamically adjusts the frame rate according to the available bandwidth and motion information. The proposed scheme has a low computational complexity and therefore is suitable for real-time applications. Experimental results show that the proposed scheme can be integrated in rate control methods to achieve higher coding efficiency.
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