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Audio/Video Experience

Last updated: 2024-11-01 20:11:00

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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Metric description

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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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Audio/Video Experience

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Metric description

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