Rate control of VBR H.261 video on frame relay networks
Bibliographic record
Abstract
The H.261 video compression standard provides an efficient scheme for the transmission of low bit-rate video traffic over high-speed networks. We introduce a modified H.261 codec that produces variable bit-rate (VBR) output for transmission over an integrated services frame relay (FR) network. We show that the quality of service requirements of VBR video can be met in the presence of inter-LAN data traffic by making use of the backward explicit congestion notification (BECN) facility, in conjunction with a modified H.261 video codec whose rate is controlled by the congestion notifications. We also show that the performance of the control mechanism is significantly influenced by a subset of network threshold and codec control parameters which is identified using 2/sup k/ factorial analysis techniques. We obtain optimal ranges of values for these parameters using mean field annealing optimization methods. Finally, we show that variable quantization rate control is more effective for this purpose than variable frame rate control and that the improvement in performance over that of an uncontrolled network is significant.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".