ApsaraVideo Live:SetLiveStreamDelayConfig

Usage notes

• You can call this operation to configure the latency of a streaming domain.
• Because an integer number of groups of pictures (GOPs) are cached, the latency is not less than the GOP size. The actual latency is calculated based on the GOP size. For example, if RtmpDelay is set to 4 seconds and the GOP size is 2 seconds, the minimum latency is 2 seconds (4 seconds minus 2 seconds) and the maximum latency is 6 seconds (4 seconds plus 2 seconds). If the GOP size is greater than the value of RtmpDelay, for example, the GOP size is 5 seconds and RtmpDelay is set to 4 seconds, the latency ranges from 0 to 9 seconds.
• Configuration for the latency of an audio-only stream is invalid. By default, the latency is close to 0.
• For HLS-based playback, the segment size equals to the latency divided by 3. Round the value down to the nearest integer. The value cannot be less than 1 second. Then, calculate the maximum number of segments. If the segment size is greater than or equal to 3 seconds, the maximum number of segments is 4. Otherwise, the maximum number of segments is 6.
• The actual HLS segment size is not smaller than the GOP size.
• The latency of HLS-based playback equals to the configured segment size times 3.
• If you do not call this operation, the default latency is 2 seconds for RTMP-based playback and 4 seconds for FLV-based playback. By default, the size of an HLS segment is 5 seconds. In this case, the latency is 15 seconds and the maximum number of segments is 6.

QPS limit

You can call this operation up to 1,000 times per second per account. Requests that exceed this limit are dropped and you will experience service interruptions. We recommend that you take note of this limit when you call this operation. For more information, see QPS limits.