MPEG-4 constant-quality constant-bit-rate control algorithms

Pai, Cheng-Yu; Lynch, William E.

doi:10.1016/j.image.2005.06.006

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…As mentioned earlier in this section, the following relations between P QP and the pb ratio (i.e., the ratio of the number of bits generated when we encode P frames to the number of bits generated when we encode B frames) are also derived empirically. pb ratio = s 1 * P QP + s 2 f or rank1 (13) pb ratio = s 3 * P QP + s 4 f or rank2 (14) pb ratio = s 5 * P QP + s 6 f or rank3 (15) where s 1 , s 2 , s 3 , s 4 , s 5 and s 6 are constants. By using (13)-(15), the number of bits needed to encode a B frame, bit B est is derived using the following relation.…”

Section: Linear Bit Estimation Modelsmentioning

confidence: 99%

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Pyramid coding based rate control for constant bit rate video streaming

Varma

Mahapatra

2015

Multimed Tools Appl

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In this paper, a novel pyramid coding based rate control scheme is proposed for video streaming applications constrained by a constant channel bandwidth. To achieve the target bit rate with the best quality, the initial quantization parameter (QP) is determined by the average spatio-temporal complexity of the sequence, its resolution and the target bit rate. Simple linear estimation models are then used to predict the number of bits that would be necessary to encode a frame for a given complexity and QP. The experimental results demonstrate that the proposed rate control scheme significantly outperforms the existing rate control scheme in the Joint Model (JM) reference software in terms of Peak Signal to Noise Ratio (PSNR) and consistent perceptual visual quality while achieving the target bit rate. Finally, the proposed scheme is validated through experimental evaluation over a miniature test-bed.

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Section: Linear Bit Estimation Modelsmentioning

confidence: 99%

“…However, the selection of macroblock level QP is more complex compared to the selection of frame level QP. In addition, due to the requirement of transmitting the changes in QP values, extra overhead is incurred that leads to a larger bit stream [13].…”

Section: Introductionmentioning

confidence: 99%

Pyramid coding based rate control for constant bit rate video streaming

Varma

Mahapatra

2015

Multimed Tools Appl

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“…In HEVC and H.264 compression standards QPs can be changed either at the frame level or the macroblock (MB) level. Though a MB level rate control is more flexible and thus is likely to result in a better quality, it incurs a higher overhead due to the requirement of transmitting the changes in QP values [4].…”

Section: Introductionmentioning

confidence: 99%