当我ffmpeg在Ubuntu上运行时,它显示:
$ ffmpeg
ffmpeg version v0.8, Copyright (c) 2000-2011 the Libav developers
built on Feb 28 2012 13:27:36 with gcc 4.6.1
This program is not developed anymore and is only provided for compatibility. Use avconv instead (see Changelog for the list of incompatible changes).
或者它显示(取决于Ubuntu版本):
$ ffmpeg
ffmpeg version 0.8.5-6:0.8.5-0ubuntu0.12.10.1, Copyright (c) 2000-2012 the Libav developers
built on Jan 24 2013 14:49:20 with gcc 4.7.2
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility …当用户超出我的最大字符数限制时,我希望我的网页发出蜂鸣声<textarea>.
我想知道如何在不播放媒体流的情况下播放通知声音.现在我可以通过媒体播放器这样做,但我不希望它作为媒体文件播放,我希望它作为通知或警报或铃声播放.下面是我的代码现在看起来像一个例子:
MediaPlayer mp = new MediaPlayer();
mp.reset();
mp.setDataSource(notificationsPath+ (String) apptSounds.getSelectedItem());
mp.prepare();
mp.start();
既然iPhone 3.0 sdk是公开的,我想我可以向那些已经玩过3.0 sdk的人提出这个问题.我想在我的应用程序中录制音频,但我想使用AVAudioRecorder而不是像SpeakHere演示的示例那样的旧录音方式.没有任何关于如何在iPhone开发人员中心做到最好的例子,只引用这些类.我是iPhone开发的新手,所以我正在寻找一个简单的示例来帮助我入门.提前致谢.
我需要使用ffmpeg将音频文件转换为mp3.
当我写命令时ffmpeg -i audio.ogg -acodec mp3 newfile.mp3,我收到错误:
FFmpeg version 0.5.2, Copyright (c) 2000-2009 Fabrice Bellard, et al.
configuration:
libavutil 49.15. 0 / 49.15. 0
libavcodec 52.20. 1 / 52.20. 1
libavformat 52.31. 0 / 52.31. 0
libavdevice 52. 1. 0 / 52. 1. 0
built on Jun 24 2010 14:56:20, gcc: 4.4.1
Input #0, mp3, from 'ZHRE.mp3':
Duration: 00:04:12.52, start: 0.000000, bitrate: 208 kb/s
Stream #0.0: Audio: mp3, 44100 Hz, stereo, s16, 256 kb/s
Output #0, mp3, to …我使用了如下命令:
ffmpeg -i video.avi -i audio.mp3 -vcodec codec -acodec codec output_video.avi -newaudio
在最新版本中添加新的音频轨道到视频(不混合).
但我将ffmpeg更新为最新版本(ffmpeg版本git-2012-06-16-809d71d),现在在此版本中该参数-newaudio不起作用.
请告诉我如何使用我的视频(而不是混音)添加新音频ffmpeg.
我的情况是我的代码需要很长时间才能运行,我不想一直盯着它,但想知道什么时候完成.
如何完成(Python)代码声音的"警报"？我正在考虑让它在到达代码末尾时播放.wav文件...
这甚至是一个可行的想法吗？如果是的话,我怎么能这样做？
我有一个播放声音的按钮,它似乎在模拟器上工作得很好,但我收到这条消息:
Error loading /System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn: dlopen(/System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn, 262): Symbol not found: ___CFObjCIsCollectable Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation in /System/Library/Frameworks/Security.framework/Versions/A/Security 2011-11-01 02:13:02.605 Halloween FX[33484:10703] Error loading /System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn: dlopen(/System/Library/Extensions/AudioIPCDriver.kext/Contents/Resources/AudioIPCPlugIn.bundle/Contents/MacOS/AudioIPCPlugIn, 262): Symbol not found: ___CFObjCIsCollectable Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation in /System/Library/Frameworks/Security.framework/Versions/A/Security 2011-11-01 02:13:02.657 Halloween FX[33484:10703] Error loading /System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn: dlopen(/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn, 262): Symbol not found: ___CFObjCIsCollectable Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation in /System/Library/Frameworks/Security.framework/Versions/A/Security 2011-11-01 02:13:02.671 Halloween FX[33484:10703] Error loading /System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn: dlopen(/System/Library/Extensions/AppleHDA.kext/Contents/PlugIns/AppleHDAHALPlugIn.bundle/Contents/MacOS/AppleHDAHALPlugIn, 262): Symbol not found: ___CFObjCIsCollectable Referenced from: /System/Library/Frameworks/Security.framework/Versions/A/Security Expected in: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator5.0.sdk/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation in …
我有以下代码:
AssetFileDescriptor afd = getAssets().openFd("AudioFile.mp3");
player = new MediaPlayer();
player.setDataSource(afd.getFileDescriptor());
player.prepare();
player.start();
问题是,当我运行这段代码时,它会按字母顺序开始播放资源目录中的所有音频文件,而不是只播放我请求的音频文件.我究竟做错了什么？有没有更好的方法从资源目录播放音频文件？
后续问题:将音频文件保存在资源目录中并将它们保存在res/raw目录中是否有区别？除了他们没有获得ID,如果他们在资产目录中的事实.如果我将音频文件移动到res/raw文件夹,那么我有一个重用MediaPlayers 的问题,因为没有id参数setDataSource().我找不到处理这类问题的好指南.