我们使用Icecast流媒体服务器在我们的网站上将jPlayer用作移动应用程序。我试图将<intro>添加到Icecast配置中，但是当我这样做时，它在移动设备上出现了问题。每当电话中断导致临时断开时（例如打进来的电话），流都会重复您首次连接流时开始播放的内容，当然会再次播放介绍视频。例如，如果我开始收听一则节目或一首歌曲的流，然后有电话打入并结束，则介绍将在重新连接上播放，然后从我最初开始收听的位置开始播放流。
我玩过Icecast队列和突发设置，上下都没有，尝试了不同的格式，得到了相同的结果。我还与其他一些与流相关的帖子进行了交谈，并被告知似乎问题出在客户端缓冲区和播放器上，而我没有设置。我看了看我们的stream-player.js，它是jPlayer 2.9.2，在3507行的末尾加上了以下内容：
;(function() {
var DOMParser, find, parse;
DOMParser = (typeof window !== "undefined" && window !== null ? window.DOMParser : void 0) || (typeof require === "function" ? require('xmldom').DOMParser : void 0) || function() {};
find = function(node, list) {
var attributes, childNode, childNodeName, childNodes, i, match, x, _i, _j, _ref, _ref1;
if (node.hasChildNodes()) {
childNodes = node.childNodes;
for (i = _i = 0, _ref = childNodes.length; 0 <= _ref ? _i < _ref : _i > _ref; i = 0 <= _ref ? ++_i : --_i) {
childNode = childNodes[i];
childNodeName = childNode.nodeName;
if (/REF/i.test(childNodeName)) {
attributes = childNode.attributes;
for (x = _j = 0, _ref1 = attributes.length; 0 <= _ref1 ? _j < _ref1 : _j > _ref1; x = 0 <= _ref1 ? ++_j : --_j) {
match = attributes[x].nodeName.match(/HREF/i);
if (match) {
list.push({
file: childNode.getAttribute(match[0]).trim()
});
break;
}
}
} else if (childNodeName !== '#text') {
find(childNode, list);
}
}
}
return null;
};
parse = function(playlist) {
var doc, ret;
ret = [];
doc = (new DOMParser()).parseFromString(playlist, 'text/xml').documentElement;
if (!doc) {
return ret;
}
find(doc, ret);
return ret;
};
(typeof module !== "undefined" && module !== null ? module.exports : window).ASX = {
name: 'asx',
parse: parse
};
}).call(this);
(function() {
var COMMENT_RE, EXTENDED, comments, empty, extended, parse, simple;
EXTENDED = '#EXTM3U';
COMMENT_RE = /:(?:(-?\d+),(.+)\s*-\s*(.+)|(.+))\n(.+)/;
extended = function(line) {
var match;
match = line.match(COMMENT_RE);
if (match && match.length === 6) {
return {
length: match[1] || 0,
artist: match[2] || '',
title: match[4] || match[3],
file: match[5].trim()
};
}
};
simple = function(string) {
return {
file: string.trim()
};
};
empty = function(line) {
return !!line.trim().length;
};
comments = function(line) {
return line[0] !== '#';
};
parse = function(playlist) {
var firstNewline;
playlist = playlist.replace(/\r/g, '');
firstNewline = playlist.search('\n');
if (playlist.substr(0, firstNewline) === EXTENDED) {
return playlist.substr(firstNewline).split('\n#').filter(empty).map(extended);
} else {
return playlist.split('\n').filter(empty).filter(comments).map(simple);
}
};
(typeof module !== "undefined" && module !== null ? module.exports : window).M3U = {
name: 'm3u',
parse: parse
};
}).call(this);
(function() {
var LISTING_RE, parse;
LISTING_RE = /(file|title|length)(\d+)=(.+)\r?/i;
parse = function(playlist) {
var index, key, line, match, tracks, value, _, _i, _len, _ref;
tracks = [];
_ref = playlist.trim().split('\n');
for (_i = 0, _len = _ref.length; _i < _len; _i++) {
line = _ref[_i];
match = line.match(LISTING_RE);
if (match && match.length === 4) {
_ = match[0], key = match[1], index = match[2], value = match[3];
if (!tracks[index]) {
tracks[index] = {};
}
tracks[index][key.toLowerCase()] = value;
}
}
return tracks.filter(function(track) {
return track != null;
});
};
(typeof module !== "undefined" && module !== null ? module.exports : window).PLS = {
name: 'pls',
parse: parse
};
}).call(this);
;(function() {
var __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };
window.PlayerUI = (function() {
function PlayerUI(container) {
var _this = this;
this.container = container;
this.onStateButtonClicked = __bind(this.onStateButtonClicked, this);
this.duration = null;
this.state = 'loading';
this.player = $('<div></div>');
this.container.append(this.player);
this.player.jPlayer({
ready: function() {
return _this.state = 'paused';
}
});
this.volume = this.container.find('.volume-slider input').rangeslider({
polyfill: false,
onSlide: function(position, value) {
return _this.player.jPlayer('volume', value / 100.0);
},
onSlideEnd: function(position, value) {
return _this.player.jPlayer('volume', value / 100.0);
}
});
this.hookEvents();
}
PlayerUI.prototype.hookEvents = function() {
var _this = this;
this.container.find('.state-button a').click(this.onStateButtonClicked);
this.player.on($.jPlayer.event.play, function() {
return _this.setState('playing');
});
this.player.on($.jPlayer.event.pause, function() {
return _this.setState('paused');
});
this.player.on($.jPlayer.event.durationchange, function(e) {
return _this.container.trigger('player.setProgressMax', {
maxValue: e.jPlayer.status.duration
});
});
this.player.on($.jPlayer.event.timeupdate, function(e) {
return _this.container.trigger('player.updateProgress', {
value: e.jPlayer.status.currentTime
});
});
return this.player.on($.jPlayer.event.ended, function(e) {
return _this.container.trigger('player.trackEnded');
});
};
PlayerUI.prototype.setState = function(state) {
this.state = state;
return this.container.find('.state-button a').removeClass().addClass("state-" + state);
};
PlayerUI.prototype.onStateButtonClicked = function(event) {
event.preventDefault();
switch (this.state) {
case 'playing':
return this.pause();
case 'paused':
return this.play();
default:
return this.noop();
}
};
PlayerUI.prototype.setMedia = function(media) {
this.pause();
return this.player.jPlayer('setMedia', media);
};
PlayerUI.prototype.setProgress = function(pct) {
return this.player.jPlayer('playHead', pct);
};
PlayerUI.prototype.play = function() {
this.setState('playing');
return this.player.jPlayer('play');
};
PlayerUI.prototype.pause = function() {
this.setState('paused');
return this.player.jPlayer('pause');
};
PlayerUI.prototype.noop = function() {
return null;
};
return PlayerUI;
})();
}).call(this);
;(function() {
window.PlaylistUI = (function() {
function PlaylistUI(container) {
var _this = this;
this.container = container;
this.container.hide();
$(window).on('playlistloader.finished', function(evt, data) {
return _this.setPlaylist(PlaylistLoader.coalescePlaylists(data.playlists));
});
}
PlaylistUI.prototype.loadM3UList = function(m3uList) {
return new PlaylistLoader(m3uList);
};
PlaylistUI.prototype.setPlaylist = function(playlistData) {
if (typeof playlistData.data !== 'undefined') {
this.name = playlistData.name;
playlistData = playlistData.data;
}
this.playlist = playlistData;
this.container.hide();
this.unhookEvents();
this.renderPlaylist();
this.container.show();
this.hookEvents();
return this.container.trigger('playlistui.ready', {
ui: this,
autoplay: false //this.getAutoplay()
});
};
PlaylistUI.prototype.unhookEvents = function() {
return this.container.find('.playlist-item').off('click.playlistUI', 'a');
};
PlaylistUI.prototype.hookEvents = function() {
var _this = this;
return this.container.find('.playlist-item').on('click.playlistUI', 'a', function(evt) {
var idx, item;
evt.preventDefault();
idx = $(evt.target).parent('.playlist-item').data('idx');
item = _this.getItemByIdx(idx);
return _this.select(item);
});
};
PlaylistUI.prototype.renderPlaylist = function() {
var idx, item, playlist, _i, _len, _ref, _results;
playlist = this.container.find('.playlist');
playlist.empty();
_ref = this.playlist;
_results = [];
for (idx = _i = 0, _len = _ref.length; _i < _len; idx = ++_i) {
item = _ref[idx];
_results.push(playlist.append(this.rowTemplate(item, idx)));
}
return _results;
};
PlaylistUI.prototype.rowTemplate = function(item, idx) {
return $("<li class=\"playlist-item\" data-idx=\"" + idx + "\"><a href=\"" + item.file + "\">" + item.title + "</a></li>");
};
PlaylistUI.prototype.getAutoplay = function() {
var item, _i, _len, _ref;
_ref = this.playlist;
for (_i = 0, _len = _ref.length; _i < _len; _i++) {
item = _ref[_i];
if (item.autoplay) {
return item;
}
}
return null;
};
PlaylistUI.prototype.getItemByIdx = function(idx) {
return this.playlist[idx];
};
PlaylistUI.prototype.getRowForItem = function(item) {
var compare, found, idx, _i, _len, _ref;
_ref = this.playlist;
for (idx = _i = 0, _len = _ref.length; _i < _len; idx = ++_i) {
compare = _ref[idx];
if (compare === item) {
found = this.container.find(".playlist-item[data-idx=" + idx + "]");
return found;
}
}
return null;
};
PlaylistUI.prototype.getIndexForItem = function(item) {
var compare, idx, _i, _len, _ref;
_ref = this.playlist;
for (idx = _i = 0, _len = _ref.length; _i < _len; idx = ++_i) {
compare = _ref[idx];
if (item === compare) {
return idx;
}
}
return null;
};
PlaylistUI.prototype.findNext = function() {
var currentIndex, nextIndex;
currentIndex = this.getIndexForItem(this.current);
if (currentIndex === null) {
return null;
}
nextIndex = currentIndex + 1;
if (nextIndex >= this.playlist.length) {
return null;
}
return this.playlist[nextIndex];
};
PlaylistUI.prototype.select = function(item) {
if (item) {
this.current = item;
this.getRowForItem(item).addClass('selected').siblings().removeClass('selected');
return this.container.trigger('playlistui.select', {
ui: this,
item: item
});
}
};
PlaylistUI.prototype.selectFirst = function() {
return this.select(this.playlist[0]);
};
PlaylistUI.prototype.selectNext = function() {
var nextItem;
nextItem = this.findNext();
if (nextItem === null) {
return false;
}
this.select(nextItem);
return true;
};
return PlaylistUI;
})();
}).call(this);
;(function() {
var __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };
window.PlaylistLoader = (function() {
function PlaylistLoader(playlists) {
this.playlists = playlists;
this.loadedItem = __bind(this.loadedItem, this);
this.loadPlaylists();
}
PlaylistLoader.prototype.loadPlaylists = function() {
var idx, item, _i, _len, _ref, _results,
_this = this;
this.loadCount = 0;
this.data = new Array(this.playlists.length);
_ref = this.playlists;
_results = [];
for (idx = _i = 0, _len = _ref.length; _i < _len; idx = ++_i) {
item = _ref[idx];
_results.push((function() {
var tmp;
tmp = idx;
return jQuery.ajax({
url: item
}).done(function(data) {
return _this.loadedItem(tmp, data);
});
})());
}
return _results;
};
PlaylistLoader.prototype.loadedItem = function(idx, data) {
var playlist;
playlist = M3U.parse(data);
this.data[idx] = playlist;
$(window).trigger('playlistloader.loadeditem', {
index: idx,
playlist: playlist
});
this.loadCount++;
if (this.loadCount === this.playlists.length) {
return this.finishedLoading();
}
};
PlaylistLoader.prototype.finishedLoading = function() {
return $(window).trigger('playlistloader.finished', {
playlists: this.data
});
};
PlaylistLoader.coalescePlaylists = function(playlistsLoaded) {
var fileEntry, output, playlist, _i, _j, _len, _len1;
output = [];
for (_i = 0, _len = playlistsLoaded.length; _i < _len; _i++) {
playlist = playlistsLoaded[_i];
for (_j = 0, _len1 = playlist.length; _j < _len1; _j++) {
fileEntry = playlist[_j];
output.push(fileEntry);
}
}
return output;
};
return PlaylistLoader;
})();
}).call(this);
;(function() {
var __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; };
window.StreamUI = (function() {
function StreamUI(selector, streamPlaylists) {
this.selector = selector;
this.streamPlaylists = streamPlaylists;
this.playlistSelect = __bind(this.playlistSelect, this);
this.playlistReady = __bind(this.playlistReady, this);
this.container = jQuery(this.selector);
this.playlist = new PlaylistUI(this.container.find('.playlist-ui'));
this.player = new PlayerUI(this.container.find('.player-ui'));
this.hookEvents();
this.playlist.loadM3UList(this.streamPlaylists);
}
StreamUI.prototype.hookEvents = function() {
var playlistUI;
playlistUI = this.container.find('.playlist-ui');
playlistUI.on('playlistui.ready', this.playlistReady);
return playlistUI.on('playlistui.select', this.playlistSelect);
};
StreamUI.prototype.playlistReady = function(evt, eventinfo) {
if (eventinfo.autoplay !== null) {
return eventinfo.ui.select(eventinfo.autoplay);
} else {
return eventinfo.ui.selectFirst();
}
};
StreamUI.prototype.playlistSelect = function(evt, eventinfo) {
this.player.setMedia({
mp3: eventinfo.item.file
});
return this.player.play();
};
return StreamUI;
})();
}).call(this);
尽管我主要是Linux开发人员，我在Perl和PHP中具有大部分编程经验，并且确实非常了解jQuery与我的Web开发打交道，但是对于jPlayer甚至音频流，我无疑是一个新手。我希望有人能在上面的代码中发现某些东西，这可能会导致在向Icecast 2.4.4流添加简介时遇到的问题？
我们的流可在下面的URL上找到，目前我对HD4流进行了介绍。
可以通过以下方法轻松地复制该问题：启动流并稍稍听一听，直到歌曲改变为止，然后拨打电话使其中断流，然后挂断电话。在介绍之后，这将导致第一首收听的歌曲再次播放。
我相信编解码器是匹配的，在将前奏格式设置为MP3 128Kbps比特率44.1KHz采样和2声道立体声之前，确实存在问题。这是介绍文件信息：
user@stream:~$ mediainfo /usr/share/icecast2/web/high_quality.mp3
General
Complete name : /usr/share/icecast2/web/high_quality.mp3
Format : MPEG Audio
File size : 138 KiB
Duration : 8s 777ms
Overall bit rate mode : Constant
Overall bit rate : 128 Kbps
Writing library : LAME3.99r
Audio
Format : MPEG Audio
Format version : Version 1
Format profile : Layer 3
Mode : Joint stereo
Mode extension : MS Stereo
Duration : 8s 803ms
Bit rate mode : Constant
Bit rate : 128 Kbps
Channel(s) : 2 channels
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 137 KiB (100%)
Writing library : LAME3.99r
Encoding settings : -m j -V 4 -q 3 -lowpass 17 -b 128
答案 0 :(得分：0)
诸如底层浏览器缓存之类的声音会踢进来，并强制重放内存中保存的内容。在某些情况下，浏览器“很棒”，然后会竭尽全力忽略无缓存指令和其他内容。
确保浏览器不尝试播放高速缓存恶作剧的一种方法是添加“高速缓存破坏者”。本质上是查询字符串（/ stream？foo = bar），它使浏览器引擎认为它是动态生成的内容并丢弃其缓存； cf. https://www.keycdn.com/support/what-is-cache-busting。
目前，您的Icecast服务器似乎未回答任何请求。因此，我无法调查您这一方面的细节。