ios – 在播放其他视频时录制视频

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:&error];

因为您正在使用UIImagePickerController进行录制,所以您无法控制扬声器和麦克风.所以测试看它是否有效.

如果您仍有问题,我建议您使用AVCaptureSession录制没有音频的视频.看看这个例子如何使用它record-video-with-avcapturesession-2.

更新：在我的VOIP应用程序中,我在播放时使用AVAudioUnit进行录制.所以我认为唯一的方法是分别录制视频和音频,然后使用AVComposition将其组合成一部电影.使用AVCaptureSession仅录制视频并使用EZAudio录制音频. EZAudio使用AVAudioUnit进行记录,以便它可以正常工作.您可以在播放电影时通过录制音频对其进行测试,看看它是否有效.我希望它会有所帮助

更新：我测试过,只有你使用耳机或选择麦克风后它才有效.
这是经过测试的代码：

NSString *moviePath = [[NSBundle mainBundle] pathForresource:@"videoviewdemo" ofType:@"mp4"];
    NSURL *url = [NSURL fileURLWithPath:moviePath];
    // You may find a test stream at <http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8>.
    AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:url];

    AVPlayer *player = [AVPlayer playerWithPlayerItem:playerItem];
    AVPlayerLayer *layer = [[AVPlayerLayer alloc] init];
    [layer setPlayer:player];
    [layer setFrame:CGRectMake(0,100,100)];
    [self.view.layer addSublayer:layer];

    [player play];

    dispatch_after(dispatch_time(DISPATCH_TIME_Now,(int64_t)(1 * NSEC_PER_SEC)),dispatch_get_main_queue(),^{
        //
        // Setup the AVAudioSession. EZMicrophone will not work properly on iOS
        // if you don't do this!
        //
        AVAudioSession *session = [AVAudioSession sharedInstance];
        NSError *error;
        [session setCategory:AVAudioSessionCategoryPlayAndRecord error:&error];
        if (error)
        {
            NSLog(@"Error setTing up audio session category: %@",error.localizedDescription);
        }
        [session setActive:YES error:&error];
        if (error)
        {
            NSLog(@"Error setTing up audio session active: %@",error.localizedDescription);
        }

        //
        // Customizing the audio plot's look
        //
        // BACkground color
        self.audioPlot.BACkgroundColor = [UIColor colorWithRed:0.984 green:0.471 blue:0.525 alpha:1.0];

        // Waveform color
        self.audioPlot.color = [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0];

        // Plot type
        self.audioPlot.plotType = EZPlotTypeBuffer;

        //
        // Create the microphone
        //
        self.microphone = [EZMicrophone microphoneWithDelegate:self];

        //
        // Set up the microphone input UIPickerView items to SELEct
        // between different microphone inputs. Here what we're doing behind the hood
        // is enumerating the available inputs provided by the AVAudioSession.
        //
        self.inputs = [EZAudioDevice inputDevices];
        self.microphoneInputPickerView.datasource = self;
        self.microphoneInputPickerView.delegate = self;

        //
        // Start the microphone
        //
        [self.microphone startFetchingAudio];
        self.microphoneTextLabel.text = @"Microphone On";

        [[AVAudioSession sharedInstance] overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:nil];
    });