Skip to content

Update 17-low-latency.adoc #9

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 2 commits into
base: main
Choose a base branch
from
Open

Update 17-low-latency.adoc #9

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
720d02d
Update 17-low-latency.adoc
mchacong Jan 16, 2025
9ef6346
Update 17-low-latency.adoc
mchacong Jan 17, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
56 changes: 33 additions & 23 deletions modules/amp-core/pages/17-low-latency.adoc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,23 @@ hls: {

The player enables low-latency playback through progressive fragment playback with HTTP chunked-based transfer. Additionally, AMP utilizes dash.js for low-latency live streams using MPEG-DASH.

[source,javascript]
----
const config = {
autoplay: true,
autoplayPolicy: "muted",
media: {
src: "https://akamaibroadcasteruseast.akamaized.net/cmaf/live/657078/akasource/out.mpd"
},
dash: {
lowLatencyMode: true,
liveDelay: 3
}
}
----

Alternatively, the client can enable low-latency playback by adjusting the player's default configuration settings.

[source,javascript]
----
const config = {
Expand All @@ -66,36 +83,29 @@ const config = {
dash: {
settings: {
streaming: {
lowLatencyEnabled: true
}
}
delay: {
liveDelay: 3
},
liveCatchup: {
enabled: true,
maxDrift: 0,
playbackRate: {
min: -0.1,
max: 0.1
}
}
}
}
}
}
----

Both `liveDelay` and `playbackRate` values are adjustable to optimize performance and results.
Both `liveDelay` and `liveCatchup` values are adjustable to optimize performance and results.

* `liveDelay`: The maximum permissible delay from the live edge, expressed in seconds.

* `playbackRate`: Playback speed percentage to catch up the live edge if the viewer falls behind.

* `liveCatchup`: This setting in Dash.js helps the player maintain proximity to the live edge by effectively managing playback drift during live streaming.

[source,javascript]
----
dash: {
settings: {
streaming: {
lowLatencyEnabled: true,
delay: {
liveDelay: 2
},
liveCatchup: {
playbackRate: 0.5
}
}
}
}
----

:last-revision: May/2024
:last-revision: Jan/2025
include::ROOT:partial$amp-additional-info.adoc[]