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Upgrade hls.js and set in low latency mode. v6.0.112 (#3924)

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HLS typically has a delay of around 30 seconds, roughly comprising three
segments, each lasting 10 seconds. We can reduce the delay to about 5
seconds by lowering the segment duration to 2 seconds and starting
playback from the last segment, achieving a stable delay.

Of course, this requires setting the OBS's GOP to 1 second, and the
profile to baseline, preset to fast, and tune to zerolatency.
Additionally, updating a few configurations in the hls.js player is
necessary, such as setting it to start playback from the last segment,
setting the maximum buffer, and initiating accelerated playback to
reduce latency.

---------

Co-authored-by: chundonglinlin <chundonglinlin@163.com>
Co-authored-by: john <hondaxiao@tencent.com>
This commit is contained in:
Winlin 2024-02-05 21:37:29 +08:00 • committed by GitHub
parent 4ca7684e36
commit 22c2469414
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16 changed files with 148 additions and 93 deletions
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37
trunk/research/players/srs_player.html
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@ -103,7 +103,7 @@
<script type="text/javascript" src="js/jquery-1.12.2.min.js"></script>
<script type="text/javascript" src="js/bootstrap.min.js"></script>
<script type="text/javascript" src="js/mpegts-1.7.3.min.js"></script>
<script type="text/javascript" src="js/hls-0.14.17.min.js"></script>
<script type="text/javascript" src="js/hls-1.4.14.min.js"></script>
<script type="text/javascript" src="js/dash-v4.5.1.all.min.js"></script>
<script type="text/javascript" src="js/json2.js"></script>
<script type="text/javascript" src="js/srs.page.js"></script>
@ -196,6 +196,8 @@
stopPlayers();
if (!r) return;
const video = document.getElementById('video_player');
// Use H5 native to play aac/mp3.
if (r.stream.indexOf('.mp3') > 0 || r.stream.indexOf('.aac') > 0) {
$('#audio_player').attr('src', r.url).show();
@ -220,7 +222,7 @@
show_for_video_ok();
tsPlayer = mpegts.createPlayer({type: 'mpegts', url: r.url, isLive: true, enableStashBuffer: false});
tsPlayer.attachMediaElement(document.getElementById('video_player'));
tsPlayer.attachMediaElement(video);
tsPlayer.load();
tsPlayer.play();
return;
@ -235,9 +237,21 @@
show_for_video_ok();
hlsPlayer = new Hls();
// See https://github.com/video-dev/hls.js/blob/master/docs/API.md#maxlivesyncplaybackrate
// See https://github.com/video-dev/hls.js/issues/3077#issuecomment-705152394
hlsPlayer = new Hls({
enableWorker: true, // Improve performance and avoid lag/frame drops.
lowLatencyMode: true, // Enable Low-Latency HLS part playlist and segment loading.
liveSyncDurationCount: 0, // Start from the last segment.
liveMaxLatencyDurationCount: 4, // Maximum delay allowed from edge of live.
maxBufferLength: 5, // Maximum buffer length in seconds.
maxMaxBufferLength: 8, // The max Maximum buffer length in seconds.
maxLiveSyncPlaybackRate: 2, // Catch up if the latency is large.
liveDurationInfinity: true // Override current Media Source duration to Infinity for a live broadcast.
});
hlsPlayer.loadSource(r.url);
hlsPlayer.attachMedia(document.getElementById('video_player'));
hlsPlayer.attachMedia(video);
video.play();
return;
}
@ -264,16 +278,23 @@
show_for_video_ok();
flvPlayer = mpegts.createPlayer({type: 'flv', url: r.url, isLive: true, enableStashBuffer: false});
flvPlayer.attachMediaElement(document.getElementById('video_player'));
// See https://github.com/xqq/mpegts.js/blob/master/src/config.js#L32
// See https://github.com/xqq/mpegts.js/blob/master/docs/api.md
flvPlayer = mpegts.createPlayer({
type: 'flv', url: r.url,
isLive: true, enableStashBuffer: false, liveSync: true
});
flvPlayer.attachMediaElement(video);
flvPlayer.load();
flvPlayer.play();
return;
}
console.error('不支持的URL', r.url, r);
$('#video_player').hide();
$('#audio_player').hide();
const msg = `Not supported URL ${r.url} ${JSON.stringify(r)}`;
console.error(msg);
alert(msg);
};
$("#txt_url").change(function(){