无法使用MediaCapture从音频设备录制mp3文件 [英] Cannot using MediaCapture to record a mp3 file from the audio device

问题描述

大家好，

我想问你的专业
经验  解决我的问题。我正在尝试使用音频设备（麦克风）和MediaCapture类录制mp3文件。

我找到了一些链接和
资源  它是如何工作的，类似于  http：//msdn.microsoft.com/en-us/library/windows/apps/hh452798.aspx 和  http://code.msdn.microsoft.com/windowsapps/Media-Capture-Sample-adf87622/

很遗憾  它对我不起作用。结果媒体文件（audioCapture.mp3或audioCapture.m4a）已经创建但它总是空的。

我也试图对MediaCapture使用一些不同的设置，这里只是一个例子：

 captureInitSettings = null; 
 captureInitSettings = new Windows.Media.Capture.MediaCaptureInitializationSettings（）; 
 captureInitSettings.audioDeviceId ="" ;;        
 captureInitSettings.videoDeviceId ="" ;; 
 captureInitSettings.streamingCaptureMode = Windows.Media.Capture.StreamingCaptureMode.audio; 
 captureInitSettings.photoCaptureSource = Windows.Media.Capture.PhotoCaptureSource.videoPreview; 
 captureInitSettings.realTimeModeEnabled = true; 
 if（deviceList.length> 0）
 captureInitSettings.audioDeviceId = deviceList [0] .id; 

但在此之后，以下代码只是创建一个空文件：

 Windows.Storage.KnownFolders.musicLibrary.createFileAsync（" audioCapture.mp3"，Windows .Storage.CreationCollisionOption.generateUniqueName）.done（function（newFile）{
 storageFile = newFile; 
 oMediaCapture.startRecordToStorageFileAsync（profile，storageFile）.done（function（file）{
 // some代码在这里
}，函数（错误）{
 WinJS.log&& WinJS.log（错误，"样本"，"错误"）; 
}）; 
}）; 

我还创建了一个分配给单独按钮的附加功能来停止录制：

 oMediaCapture.stopRecordAsync（）。done（function（result）{
 record State = false; 
 
 //播放录制的视频。 
 var audio = id（" capturedAudio"）; 
 audio.src = URL.createObjectURL（storageFile，{oneTimeOnly：true}）; 
 audio.play（）; 
 id（" message"）。innerHTML =" Record Stopped。档案" + storageFile.path +"英寸; 
 localSettings.values [audioKey] = storageFile.path; 
 
}，
 errorHandler）; 

它不起作用！

创建的文件为空通常。

你能帮我或告诉我这里有什么问题吗？

ps：以下相机（照片）捕获示例工作正常 -   http://code.msdn.microsoft.com/windowsapps/CameraCaptureUI-Sample -845a53ac

提前致谢！

Dmitry

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解决方案

您好，

关于您的代码，在开始记录时，您正在致电：

MediaCapture.startRecordToStorageFileAsync

停止记录时，您正在调用：

oMediaCapture.stopRecordAsync

所以看起来MediaCapture和oMediaCapture是两个不同的对象。 需要它在开始和结束方法中使用相同的对象。

最好的问候，

Ming Xu。

Hello guys,

I would to ask your professional experience to solve my issue. I'm trying to record a mp3 file using the audio device (microphone) and MediaCapture class.

I have found a few link and resources how it works, something like http://msdn.microsoft.com/en-us/library/windows/apps/hh452798.aspx and http://code.msdn.microsoft.com/windowsapps/Media-Capture-Sample-adf87622/

Unfortunately it doesn't work for me. As a result the media file (audioCapture.mp3 or audioCapture.m4a) has been created but it is always empty.

I also was trying to use some different settings to MediaCapture, here is just one example:

captureInitSettings = null;
captureInitSettings = new Windows.Media.Capture.MediaCaptureInitializationSettings();
captureInitSettings.audioDeviceId = "";        
captureInitSettings.videoDeviceId = "";
captureInitSettings.streamingCaptureMode = Windows.Media.Capture.StreamingCaptureMode.audio;
captureInitSettings.photoCaptureSource = Windows.Media.Capture.PhotoCaptureSource.videoPreview;
captureInitSettings.realTimeModeEnabled = true;
if (deviceList.length > 0)
    captureInitSettings.audioDeviceId = deviceList[0].id;

But after that the following code just creating an empty file:

Windows.Storage.KnownFolders.musicLibrary.createFileAsync("audioCapture.mp3", Windows.Storage.CreationCollisionOption.generateUniqueName).done(function (newFile) {
            storageFile = newFile;
       oMediaCapture.startRecordToStorageFileAsync(profile, storageFile).done(function (file) {
                // some code here
            }, function (err) {
                WinJS.log && WinJS.log(err, "sample", "error");
            });
        });

I also have created one additional function assigned to the separate button to stop recording:

oMediaCapture.stopRecordAsync().done(function (result) {
            recordState = false;

            // Playback the recorded video.
            var audio = id("capturedAudio");
            audio.src = URL.createObjectURL(storageFile, { oneTimeOnly: true });
            audio.play();
            id("message").innerHTML = "Record Stopped.  File " + storageFile.path + "  ";
            localSettings.values[audioKey] = storageFile.path;

        },
        errorHandler);

It doesn't work!

Created file is empty as usual.

Could you please help me or tell me what is wrong here?

p.s.: the following Camera (Photo) Capture example works fine - http://code.msdn.microsoft.com/windowsapps/CameraCaptureUI-Sample-845a53ac

Thanks in advance!

Dmitry

解决方案

Hi,

Regard to your code, when starting the record, you’re calling:

MediaCapture.startRecordToStorageFileAsync

When stopping the record, you’re calling:

oMediaCapture.stopRecordAsync

So it looks like MediaCapture and oMediaCapture are two different objects. It is needed to use the same object in both start and stop methods.

Best Regards,

Ming Xu.

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