The video encoder rate control is responsible for allocating the bits per frame for optimum performance.
Figure9 shows detailed data using luminance PSNR (Y-PSNR), bits per frame, and percentage of references using McFIS/second previous frame by the proposed, Ding's, Matsuoka's, and the H.264 (with fixed GOP and five reference frames) algorithms, respectively.
Distribution of the number of bits per frame among the frequency bands, in the case of a transmission rate of 64 kbps and SNR of 0 dB.
(a) Luminance PSNR, (b) Bits per frame, and (c) Percentage of references using McFIS/second previous frame for 100 frames in News video sequence with the proposed, Ding's, Matsuoka's, and the H.264 (fixed GOP and five reference frames) algorithms.
For the PFS and b2PFS scheduling functions, the number of bits per frame that should be transmitted is equal to the number of buffered bits.
Now, the number of required bits per frame is directly obtained from the remaining buffered bits after the previous allocation process, that is, (15).
When the computed number of target bits per frame is low, i.e. there is a low bit rate and a high complexity frame, there is a high probability that number of target bits will fall below zero for the succeeding frames.
With the higher referencing rate of McFIS in Figure9c, the proposed method outperforms the other three methods in terms of compression (lower bits per frame) and image quality (higher PSNR) (see Figure9a,b).
This means that a total of 4 | C | bits per frame time T f is required by DLF-BRSA, which corresponds to a feedback rate on the order of a few tens of kilobits per second, given that | C | is usually on the order of tens to hundreds (e.g., see [2, 3]).
In VBR video with varying bits per frame, a buffer is needed at the receiver to store sufficient amount of bits to decode and play a video at its scheduled time to maintain display continuity.
