avfoundation

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center . Closed 7 years ago . I wish to write an iphone app that allows your to take 2 consecutive pictures in a very short time, and I wonder if it is achievable. May apps in the market seems to only take low resolution still frames out of video stream, so I wonder if fast capturing full resolution photo is feasible. Felix It depends on what

I'm trying read or understand CMBlockBufferRef representation of H.264 AVC 1/30 frame. The buffer and the encapsulating CMSampleBufferRef is created by using VTCompressionSessionRef . https://gist.github.com/petershine/de5e3d8487f4cfca0a1d H.264 data is represented as AVC memory buffer, CMBlockBufferRef from the compressed sample. Without fully decompressing again , I'm trying to extract motion vectors or predictions from this CMBlockBufferRef . I believe that for the fastest performance, byte-by-byte reading from the data buffer using CMBlockBufferGetDataPointer() should be necessary. However

I want to detect specially on iPad's if there is ear piece available or not. For example - I can detect if the iOS device hasTourch or not using AVFoundation so is there any way to detect ear piece availability. 1) If you want to check if Ear piece (Receiver speaker) is available on device You can identify this by simply identifying if Device is iPhone. UIDevice.current.userInterfaceIdiom == .phone in iOS prottype AVAudioSessionPortBuiltInReceiver is there for builtInreceriver speaker. and according to apple's documentation , This is available only on iPhone device. So there is no need to

Looking at the docs, I should be able to use BGRA for the internal format of a texture. I am supplying the texture with BGRA data (using GL_RGBA8_OES for glRenderbufferStorage as it seems BGRA there is not allowed). However, the following does not work: glTexImage2D(GL_TEXTURE_2D, 0, **GL_BGRA**, w, h, 0, GL_BGRA, GL_UNSIGNED_BYTE, buffer); ... glReadPixels(0, 0, w,h, GL_BGRA, GL_UNSIGNED_BYTE,buffer, 0); While this gives me a black frame: glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_BGRA, GL_UNSIGNED_BYTE, buffer); ... glReadPixels(0, 0, w,h, **GL_BGRA**, GL_UNSIGNED_BYTE,buffer, 0);

I am using AVCaptureMovieFileOutput to record videos and I want to add a UIProgressView to represent how much time there is left before the video stops recording. I set a max duration of 15 seconds: CMTime maxDuration = CMTimeMakeWithSeconds(15, 50); [[self movieFileOutput] setMaxRecordedDuration:maxDuration]; I can't seem to find if AVCaptureMovieFileOutput has a callback for when the video is recording or for when recording begins. My question is, how can I get updates on the progress of the recording? Or if this isn't something that is available, how can I tell when recording begins in

there are tons of topics on SO about video preloading but still isn't crystal clear for me. Objectives: Load video from the network, URL is given Wait for video loaded completely Play video without delay (as I said it's already buffered 100%) Ideally, calculate download speed, predict f.e when buffered 60% of video, we start playing and 40% will be buffered while playing without delay. what I tried: NSURL *url = [NSURL URLWithString:@"video url address here"]; AVURLAsset *avasset = [[AVURLAsset alloc] initWithURL:url options:nil]; AVPlayerItem *item = [[AVPlayerItem alloc] initWithAsset

I used AVQueuePlayer to play several items in background. And code worked perfect in iOS4. And in iOS5 AVQueuePlayer changed its behavior, so player stops playing after first item is ended. Matt Gallagher wrote a hint in this post . "As of iOS 5, it appears that AVQueuePlayer no longer pre-buffers. It did pre-buffer the next track in iOS 4." So my question is how to play several items in background using AVPlayer or AVQueuePlayer in iOS5. Matt Gallagher's answer in his blog : "You must observe the current item in the AVQueuePlayer. When it changes, you must use UIApplication to start a