Question

我将音频文件MP4转换为AAC，然后想要在SoundManager2中播放该文件。如果我使用某些软件进行Windows转换，每次都很好，音频播放效果很好。但是，在服务器端，当使用ffmpeg将MP4文件转换为AAC时，文件将加载到SM2中，但不会启动播放。

我使用这个命令：

ffmpeg -i in.mp4 out.aac

这是SoundManager2日志：

-- SoundManager 2: HTML5 support tests (/^(probably|maybe)$/i): mp3: true (preferring flash), mp4: true (preferring flash), ogg: true, wav: true -- soundmanager2.js:1156
-- SoundManager 2 V2.97a.20120916 (AS3/Flash 9) + HTML5 audio, high performance mode, custom (1ms) polling, wmode: transparent, flash debug mode, flashBlock mode -- soundmanager2.js:1156
soundManager::createMovie(): Trying to load /soundmanager/swf/soundmanager2_flash9_debug.swf soundmanager2.js:1156
soundManager::initMovie(): Waiting for ExternalInterface call from Flash... soundmanager2.js:1158
soundManager::externalInterfaceOK() (~0 ms) soundmanager2.js:1158
soundManager::init() soundmanager2.js:1158
soundManager: Attempting JS to Flash call... soundmanager2.js:1158
(Flash): SM2 SWF V2.97a.20120916 (AS3/Flash 9) soundmanager2.js:1158
Flash security sandbox type: remote soundmanager2.js:1158
(Flash): JS to/from Flash OK soundmanager2.js:1158
(Flash): Enabling polling, 1 ms interval soundmanager2.js:1158
-- SoundManager 2 loaded (OK) -- soundmanager2.js:1156
soundManager: Firing 1 onready() item soundmanager2.js:1158
threeSixtyPlayer.init() soundmanager2.js:1158
threeSixtyPlayer.init(): Found 1 relevant items. soundmanager2.js:1158
handleClick() soundmanager2.js:1158
soundManager.createSound(): ui360Sound0 (http://[private url]/out.aac?v=1350309261) soundmanager2.js:1156
soundManager.createSound(): Enabling usePolicyFile for data access soundmanager2.js:1158
SMSound() merged options: {
 id: ui360Sound0, 
 url: http://[private url]/out.aac?v=1350309261, 
 onplay: { pl.removeClass(this._360data.oUIBox,this._360data.className); t... }, 
 onstop: { pl.removeClass(this._360data.oUIBox,this._360data.className); t... }, 
 onpause: { pl.removeClass(this._360data.oUIBox,this._360data.className); t... }, 
 onresume: { pl.removeClass(this._360data.oUIBox,this._360data.className); t... }, 
 onfinish: { var nextLink; pl.removeClass(this._360data.oUIBox,this._360data... }, 
 onbufferchange: { if (this.isBuffering) { pl.addClass(this._360data.oUIBox,pl.css... }, 
 whileloading: { if (this.paused) { self.updatePlaying.apply(this); } }... }, 
 whileplaying: { self.updatePlaying.apply(this); this._360data.fps++; }... }, 
 useWaveformData: false, 
 useEQData: false, 
 usePeakData: true, 
 autoLoad: false, 
 autoPlay: false, 
 loops: 1, 
 multiShot: true, 
 multiShotEvents: false, 
 pan: 0, 
 stream: true, 
 usePolicyFile: true, 
 volume: 50, 
 useMovieStar: false, 
 isMovieStar: false, 
 bufferTime: 3
} soundmanager2.js:1158
(Flash): SoundManager2_SMSound_AS3: Got duration: 0, autoPlay: false soundmanager2.js:1158
SMSound.play(): Attempting to load "ui360Sound0" soundmanager2.js:1156
SMSound.load(): http://[private url]/out.aac?v=1350309261 soundmanager2.js:1156
SMSound.play(): "ui360Sound0" is starting to play soundmanager2.js:1158
fanOut: ui360Sound0: http://[private url]/out.aac?v=1350309261 soundmanager2.js:1158
(Flash): start (ui360Sound0): 0 soundmanager2.js:1158
SMSound._onbufferchange(): 1 soundmanager2.js:1158
SMSound._onbufferchange(): 0 soundmanager2.js:1158
SMSound._onload(): "ui360Sound0" loaded.

可能有什么问题？

Answer 1

仅SoundManager（完全）支持MPEG-4 AAC音频。您尝试播放的文件可能是MPEG-2 Part 7中定义的AAC的“非向后兼容”版本：

MPEG-2标准的
Part 7 (ISO/IEC 13818-7)指定了一种相当不同的，非向后兼容的音频格式（也称为MPEG-2 NBC）。第7部分称为MPEG-2 AAC。

据我所知，只有Safari（QuickTime）会播放这些文件。 Chrome或Flash都不会播放这些文件。但是，MPEG-2 AAC文件的MIME类型对于MPEG-4 varient是相同的，因此在您尝试播放之前几乎不可能知道该文件是不可播放的。（当被问到时，MPEG-LA回答“因为你这就是原因。”）

在SoundManager2中播放AAC将无法启动

1 个答案: