After creating an audio/video experience monitoring task successfully, you can analyze the overall audio/video performance on the Test Statistics page.
Directions
1. Log in to the CAT console.
2. Click Test Statistics on the left sidebar and select Audio/Video experience.
3. On the Test Statistics page, analyze the test data in multiple dimensions such as map, line chart, figure, and detailed data.
Metric description
Metric | Description |
Duration of the first buffer (s) | Duration of the first buffer = time to first frame – time to first video packet Lag duration: The cumulative duration of lag (buffer) after the start of video playback (excluding the first buffer). |
Total buffer duration (s) | Total buffer duration = duration of the first buffer + duration of lag 1 + duration of lag N. |
Total buffers | Total number of buffers = first buffer + number of lags. |
Time to first video packet (s) | The time from getting the actual video address to getting the first video packet. |
Average download speed (KB/s) | The speed at which the player downloads video resources during playback: Average download speed = total number of downloaded bytes / throughput duration. |
Availability (%) | The percentage of successful streaming media tasks to the total number of test tasks. |
Time to first frame (s) | The time from getting the actual video address to playing back the first video frame. |
Total buffer duration (s) | Total buffer duration = duration of the first buffer + duration of lag 1 + duration of lag N. |
Lag duration (s) | The cumulative duration of lag (buffer) after the start of video playback (excluding the first buffer). Lag duration = total buffer duration – duration of the first buffer. |
Percentage of lag duration (%) | The ratio of the lag duration to the total playback duration, i.e., lag duration / total playback duration (up to 60s). |
Lag rate (%) | Lag rate = total number of lag samples / number of valid test tasks. Total number of lag samples: Total number of samples buffered again during the playback of all videos. |
Errors | Number of failed access requests in the test. |
Top 5 error types | The top five error types of the most errors. |
Top 5 slowest ISPs | The top five ISPs with the longest total buffer duration. |
Resource DNS time | The time taken to resolve the domain of the resource server when the player downloads video resources. |
Resource TCP connection duration | The time taken to establish a TCP connection when the player downloads video resources. |
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