Video Metrics

Maintaining user Quality of Experience (QoE) is immensely challenging for video applications because it is difficult to measure success in delivering high-quality video. Video applications do not have a widely accepted video quality standard equivalent to the MOS for audio. Video quality is more subjective than audio quality, and it is more complicated to implement.

Note: Video metrics are available only from monitored Microsoft Lync environments or from medianet-enabled devices.

Frozen Period

The average length of frozen video instances.

Frozen Video

The frequency of long and noticeable frozen video periods for an entire session. Expressed as a percentage of session time.

Video Bit Rate

Bit rates provide a gauge of codec performance.

Video Bit Rate. Average number of bits sent per second for an entire stream.
Video Bit Rate (Max). Maximum number of bits sent per second for and entire stream.

Video Frame Decoding Time

The average amount of time for decoding frames in a stream. A slower decoding rate can be the result of conditions on the endpoint, such as lack of CPU resources, and can affect call quality.

Video Frame

Frame Loss: The average number of unique consecutive images, or video frames, lost due to corruption and error concealment for the entire system. Video frames can span multiple packets. Video frames can span multiple packets, so this metric is useful when compared with the video packet loss metric.
Frame Rate: The average number of frames that were sent or received per second for an entire stream.

Video Jitter

Video Jitter. The variation in delay among video packets in the same stream.
Video Jitter (Max). The highest observed jitter level for the call.

Video Latency

The maximum time for a video packet to travel between the calling parties. Measured from end-to-end in one direction. Calculated by taking the average round-trip time for a call leg in a given video call and dividing it in half.

Video Packet

The percentage of video packets that were lost in transit. These packets were sent but never received at the destination.

Packet Loss. The average loss rate. The maximum rate is also provided.
Packets Received. A means of gauging the size of the data stream.
Packets Lost. The difference between the number of packets that were sent and the number of packets that were received.
Consecutive Packet Loss. The percentage of all packets that were lost consecutively. This value provides a gauge of loss burstiness.