Stats for Nerds

In the Stats for Nerds panel, you can view connection and recording stats for any participant in a recording session. To open the Stats for Nerds panel, click the Show Stats button in the top right corner of any participant's video feed.

How to show stats for a participant in a recording session

Connection Stats

Connection stats are available for anyone on the Stage during a recording session. These stats indicate the quality of the conference audio and video streams to other participants and do not reflect in the quality of primary local recordings.

Used out of Available Bitrate

Each audio and video stream is sent at a variable bitrate to other session participants. This bitrate can change over time and depends on the resolution and complexity of the information being sent and the participant's network connection.  

Multiple video streams are sent at different resolutions on browsers that support it. You can see these reflected in the stats, marked as low (L), medium (M), and high (H) quality video resolutions. This allows other participants with bandwidth restrictions to receive a lower bitrate video stream, helping to keep their latency low when needed.

Available bitrate is given when the browser supports it, indicating the overall bandwidth available for the live conference streams. Most browsers limit this to a maximum of ~6 Mbit/s. Two charts display the bitrate stats, and the charts below show a healthy connection with plenty of available bandwidth.

The first shows a history of each value in the last several minutes.

used-of-available-bitrate-graph.png

The second shows a pie chart of the current participants.

used-of-available-bitrate-pie.png

Jitter & Packet Loss

Jitter reflects how consistently your audio and video streams are being sent over the network, which can increase when data is delayed. High jitter can lead to an extra delay (latency) in the conversation or mild distortions in the audio or video. Again, this is not reflected in the quality of primary local recordings.

Packet loss can happen when data is lost over the network. Packet loss can cause many issues with the video and audio stream, including missed words, frozen or glitchy videos (dropped frames), or even a complete dropout from the conference.

Both of these stats are given in a single chart. Jitter over time is shown by the lines matching the stream color. Packets lost will appear as red bars at the point in time they occurred. The chart below shows a low-jitter connection that lost two packets while running a network speed test.

jitter-and-packet-loss.png

Recording Stats

Recording stats are available for all participants on the Stage while the recording is actively being captured.

Primary recording quality is not impacted by network conditions. Each primary recording will show the file's current size and the Progressive Upload progress as you are recording. Each primary local recording also displays additional stats such as audio sampling rate, video resolution, and video frames per second.

An approximate real-time bitrate is displayed for each recording as well. This will change based on the hardware device being used and the dynamic content of the media stream. This is mostly seen with screen recordings, where the real-time bitrate can drop very low when showing a static image that doesn't change very often.

recording-stats.png

Troubleshooting

When a great conversation gets interrupted by something technical, it can be hard to know where to start to get the problem fixed. A glance at a participant's connection stats tells you if there is a problem with the network connection. The stats below show an iPad with a poor WiFi connection struggling to send a higher bitrate video stream. The limited available bandwidth, large jumps in jitter, and consistent packet loss can all cause issues with network connectivity to the conversation. Moving closer to the wireless router or switching to a different network, ideally wired, and refreshing the page would resolve the issue.

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