# Troubleshoot MediaTailor SSAI with CDNs for uninterrupted ad delivery
This section provides solutions for common issues when using AWS Elemental MediaTailor dynamic ad insertion with a content delivery network (CDN). These solutions will help you troubleshoot problems with your video monetization through personalized advertising.
For comprehensive CDN troubleshooting guidance including cache performance issues, HTTP error resolution, testing procedures, and diagnostic techniques that apply to all MediaTailor implementations, see [Troubleshoot CDN integration](cdn-troubleshooting.md). This section focuses on SSAI-specific troubleshooting requirements and ad insertion issues.
If you encounter issues with your CDN and SSAI setup, check these common problems:
Personalized advertising not appearing in stream
Verify that your ADS responds correctly and that AWS Elemental MediaTailor communicates with it. Check these potential issues:
+ Ad targeting query parameters not properly forwarded through your CDN
+ Ad break points incorrectly defined in your content
+ ADS connectivity or response problems
Playback errors at ad break points
Ensure that ad segments are properly transcoded to match your content bitrates and resolutions. Check these common issues:
+ CDN incorrectly routing requests for ad segments
+ Manifest manipulation errors at transition points
+ Mismatched encoding profiles between content and ads
Stale manifests
For live content, verify that your CDN cache TTL settings are appropriate. For personalized manifests, use TTL of 0 seconds. Consider implementing cache invalidation for rapidly changing manifests. For comprehensive TTL guidance, see [Caching optimization for CDN and MediaTailor integrations](cdn-optimize-caching.md).
High latency
Check your CDN configuration for optimal routing. Ensure that your CDN has edge locations near your viewers for best performance.
## Advanced troubleshooting
For more complex issues, try these advanced troubleshooting techniques:
Inconsistent ad targeting behavior
Check for query parameter inconsistencies between player requests and ADS requests. Ensure all required targeting parameters are properly passed through the CDN.
CDN cache inconsistencies
Verify cache key configurations to ensure proper content differentiation. Consider implementing cache purging for critical manifest updates.
Ad tracking failures
Check that beacon URLs are properly forwarded and not blocked by the CDN. Verify that client players can reach the tracking endpoints.
## Performance optimization
To optimize the performance of your dynamic ad insertion and video monetization workflow:
+ Fine-tune TTL settings based on content type and viewer patterns. For detailed TTL recommendations, see [Caching optimization for CDN and MediaTailor integrations](cdn-optimize-caching.md).
+ Implement geographic routing to minimize latency for global audiences
+ Consider using multiple CDNs for redundancy and optimal performance
+ Monitor cache hit ratios and adjust configurations accordingly
+ Optimize manifest manipulation processes to reduce processing time at ad break points
+ Pre-transcode ads to match common content profiles for seamless personalized advertising insertion
### Performance benchmarks
When optimizing your AWS Elemental MediaTailor ad insertion CDN integration, aim for these performance benchmarks:
Cache Hit Ratio Targets
Content segments: greater than 95% cache hit ratio
Ad segments: greater than 90% cache hit ratio
Manifests: Not applicable (should not be cached for personalized ad insertion)
Latency Benchmarks
Manifest request latency: less than 100ms (P95)
Content segment delivery: less than 50ms (P95)
Ad segment delivery: less than 75ms (P95)
End-to-end startup time: less than 2 seconds
Origin Load Metrics
Origin requests per viewer: less than 0.1 requests per minute per viewer
Origin bandwidth per viewer: less than 5% of total viewer bandwidth
Error Rate Targets
Manifest errors: less than 0.1%
Segment errors: less than 0.01%
Player-reported rebuffering: less than 1%
Scalability Benchmarks
Support for 10 times the normal traffic during peak events without degradation
Ability to handle greater than 1000 requests per second per channel
Use Amazon CloudWatch metrics to track these performance indicators. For detailed monitoring instructions, see [Monitoring AWS Elemental MediaTailor with Amazon CloudWatch metrics](monitoring-cloudwatch-metrics.md).
## Related information
For more information about ad insertion with CDNs, see:
Ad insertion documentation
[Getting started with MediaTailor ad insertion](getting-started-ad-insertion.md) - Learn about ad insertion concepts
[Setting up](setting-up.md) - Get started with ad insertion
CDN integration
[Set up CDN integration](cdn-configuration.md) - General CDN configuration guidance
[CloudFront integration](cloudfront-specific-recommendations.md) - CloudFront specific configuration
Channel assembly integration
[Channel assembly with CDN](ca-cdn-wflw.md) - Learn about channel assembly with CDNs
[Implement ad insertion](ca-cdn-setup-advanced.md) - Implement ad insertion with channel assembly
Monitoring and optimization
[Monitor operations for CDN and MediaTailor integrations](ssai-cdn-monitor.md) - Comprehensive monitoring and analytics
[Optimize performance for CDN and MediaTailor integrations](ssai-cdn-performance.md) - Performance optimization guide
[Monitoring AWS Elemental MediaTailor with Amazon CloudWatch metrics](monitoring-cloudwatch-metrics.md) - CloudWatch metrics for MediaTailor