De Ce Adaptive Bitrate
Condițiile de rețea variază. Adaptive bitrate asigură cea mai bună calitate posibilă în orice moment, fără întreruperi sau buffering.
6-64 kbps
Dynamic range
Real-time
Adaptation
0 buffer
No interruptions
Quality Levels
| Level | Bitrate | Quality | Network Required |
|---|---|---|---|
| Ultra | 64+ kbps | Studio quality | Excellent |
| High | 32-48 kbps | Clear, natural | Good |
| Medium | 16-24 kbps | Good, slight compression | Fair |
| Low | 8-12 kbps | Acceptable, noticeable compression | Poor |
| Emergency | 6 kbps | Intelligible only | Very Poor |
Network Signals
Packet Loss Rate
Percentage of lost packets
Round Trip Time
Network latency measurement
Jitter
Packet timing variance
Available Bandwidth
Estimated throughput
Switching Strategies
Aggressive
Fast adaptation, may oscillate
Best for: Variable networks
Conservative
Slow, stable changes
Best for: Stable networks
Hybrid
Fast down, slow up
Best for: Most scenarios
Adaptation Algorithm
function selectQualityLevel(networkMetrics) {
const { packetLoss, rtt, jitter, bandwidth } = networkMetrics;
// Calculate network score (0-100)
let score = 100;
score -= packetLoss * 10; // -10 per 1% loss
score -= Math.max(0, rtt - 100) / 5; // -1 per 5ms over 100ms
score -= Math.max(0, jitter - 20) / 2; // -1 per 2ms jitter
// Map score to quality level
if (score > 90) return 'ultra';
if (score > 75) return 'high';
if (score > 50) return 'medium';
if (score > 25) return 'low';
return 'emergency';
}Best Practices
✓ Downgrade rapid, upgrade lent
✓ Hysteresis pentru a evita oscillation
✓ User notification la low quality
✓ Fallback la audio-only dacă e necesar