tapharmonic / learning-av-foundation Goto Github PK

in chapter 2, we should set Session Category in '- (void)applicationWillResignActive:(UIApplication *)application',not '- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions' .
like this :

• (void)applicationWillResignActive:(UIApplication *)application {
  AVAudioSession *session=[AVAudioSession sharedInstance];
  [session setActive:YES error:nil];
  [session setCategory:AVAudioSessionCategoryPlayback error:nil];
  }

when I use
[nsnc addObserver:self selector:@selector(handleInterruption:) name:AVAudioSessionInterruptionNotification object:[AVAudioSession sharedInstance]];

else { //AVAudioSessionInterruptionTypeEnd AVAudioSessionInterruptionOptions options = [info[AVAudioSessionInterruptionOptionKey] unsignedIntegerValue]; if (options == AVAudioSessionInterruptionOptionShouldResume) { [self play]; if (self.delegate) { [self.delegate playbackBegan]; } }

music not playback to play tell me why [email protected]

chapter11 选区过渡模式不能播放

I want to make time lapse video,but when reduce fps ,it seems done not work. Could you give me some advices. Thanks

In KameraWriter_Final I found
self.captureSession.sessionPreset = [self sessionPreset];

did in fact not take effect, where as
[self.captureSession setSessionPreset:AVCaptureSessionPresetInputPriority];

did. Not sure why the return value didn't work, maybe missing const?

Also, it is worth adding support for check for

if(![videoDevice supportsAVCaptureSessionPreset:AVCaptureSessionPreset1280x720]){
 NSDictionary *userInfo = @{NSLocalizedDescriptionKey : @"Camera does not support session preset"};
        *error = [NSError errorWithDomain:THCameraErrorDomain
                                     code:THCameraErrorFailedToAddInput
                                 userInfo:userInfo];
        return NO;
}

as the front camera on an iPad2 for instance fails without throwing an error.

I selected 3 videos in Chapter 11/FifteenSeconds_Final,when run the app,and select 3 videos in app,the pointer show at the end,and THPlayerViewController show nothing!

Chapter 2 contains the following passage:

With the audio session properly configured, redeploy the app to your device and run the tests again. You can hear that toggling the Ring/Silent switch no longer mutes the audio. This behavior looks good, so let’s verify that your audio continues to play when you lock the device. If you hit the Lock button, you can hear the audio continues to... Houston, we have a problem. You’re still seeing the same behavior as before. Shouldn’t you have solved this issue by setting the category to AVAudioSessionCategoryPlayback? The answer is no. Setting this category makes the app eligible to play audio in the background, which is the state we’re in when the device locks, but you still need to explicitly opt in to that behavior by making a small change to the application’s Info.plist.

then continues to describe how to add the relevant background mode to the app's plist. However, the starter already has the background mode added, so the passage and explanation can confuse readers.

You see for the camera writer
Would the tap to focus for the tapped screen point work for this as they refer to the preview layer if i am not mistaken.

Kevin reported that audio and video get out of sync when switching cameras during a recording session. This is most likely due to the presentation time stamps getting out of sync. Look into a resolution if this issue.

When i receive a call the display freezes is there a way i can stop this from happening

In chapter6, I find the same problem in stackoverflow.

I need your help.

After completing the code changes to ZoomKamera_Starter from Listing 7.2 and running the resulting app I find that the app will build, then run on my iPhone 6 but only displays a black screen. A few seconds later Xcode will display the error 'ZoomKamera [356:21199] Error: (null)' I reviewed the code I entered to ensure that it was accurate. Various troubleshooting measures (cleaning project, deleted app on iPhone, restarting iPhone, restarting Xcode) did not resolve issue. It's also reproducible when running project in second user account on Mac. Also occurs when running ZoomKamera_Starter without making any changes.

ZoomKamera_Final runs fine however.

This is on a MacBook Pro (mid-2012) running OS X 10.12.1 Sierra and Xcode 8.1 (8T61a).

We have moved pretty much 100% to Swift. Wondering when an updated version of the book will be coming out. thanks :-)