avassetwriter

Trying to get started with the really great GPUImage framework so graciously shared by Brad Larson, but having an issue. When running the SimpleVideoFileFilter sample it always crashes at completion with the following error: [AVAssetWriterInput markAsFinished] Cannot call method when status is 2 Anyone know how to correct this? Also do not see the video when run in simulator, does it not work for simulator? Running iOS 6.1 and Xcode 4.6 Thanks! I am noticing that finishRecordingWithCompletionHandler is being called twice, it crashes on second call 来源： https://stackoverflow.com/questions

I need to get a CMSampleBuffer for the OpenGL frame. I'm using this: int s = 1; UIScreen * screen = [UIScreen mainScreen]; if ([screen respondsToSelector:@selector(scale)]){ s = (int)[screen scale]; } const int w = viewController.view.frame.size.width/2; const int h = viewController.view.frame.size.height/2; const NSInteger my_data_length = 4*w*h*s*s; // allocate array and read pixels into it. GLubyte * buffer = malloc(my_data_length); glReadPixels(0, 0, w*s, h*s, GL_RGBA, GL_UNSIGNED_BYTE, buffer); // gl renders "upside down" so swap top to bottom into new array. GLubyte * buffer2 = malloc(my

I tried to make video in reverse. While playing asset in AVPlayer i set the rate = -1 to make it work in reverse format. But how to export that video? I looked into docs. read about avassetwrite, sambuffers , compositions but didn't find any way to do this. Below links are refered by me http://www.raywenderlich.com/13418/how-to-play-record-edit-videos-in-ios Reverse video demo - https://github.com/mikaelhellqvist/ReverseClip Above example to no longer works in IOS 8. and even it is not reversing audio. If anyone give me little hint on it then i can do further. I am stuck up here from last 5

I noticed in the iOS documentation for AVAssetWriterInput you can pass nil for the outputSettings dictionary to specify that the input data should not be re-encoded. The settings used for encoding the media appended to the output. Pass nil to specify that appended samples should not be re-encoded. I want to take advantage of this feature to pass in a stream of raw H.264 NALs, but I am having trouble adapting my raw byte streams into a CMSampleBuffer that I can pass into AVAssetWriterInput's appendSampleBuffer method. My stream of NALs contains only SPS/PPS/IDR/P NALs (1, 5, 7, 8). I haven't

I’d like to take some video frames and encode them into a video. It looks like that’s exactly what AVAssetWriter was meant for, but no matter how I eyeball the docs and Google I can’t find any way to actually use it. From the docs it looks like I need an input ( AVAssetWriterInput ) to feed the writer from. Fine. But the AVAssetWriterInput class is abstract and the only subclass that I know of in 4.1 is AVAssetWriterInputPixelBufferAdaptor that requires a AVAssetWriterInput in its initializer…? Am I missing something obvious here? zoul Ah yes, I have to acquire an instance using +

I am Successful in encoding a series of image captured by AVCaptureVideoPreviewLayer of AVFoundation Framework into a Video using AVAssetWriter and AVAssetWriterInput. But the size of the video is too large, Can anyone of you suggest me a tutorial or atleast a direct me in this case or give me the correct Video output Settings for video compression. I am using the following VideoOutputSetting. videoOutputSettings = @{ AVVideoCodecKey: AVVideoCodecH264, AVVideoWidthKey: [NSNumber numberWithInt:width], AVVideoHeightKey: [NSNumber numberWithInt:height], AVVideoCompressionPropertiesKey: @{