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Questions tagged [cmsamplebuffer]

106 questions
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How to properly address the pixels in a CVPixelBuffer?

The short question is: What's the formula to address pixel values in a CVPixelBuffer? I'm trying to convert a CVPixelBuffer in a flat byte array and noticed a few odd things: The CVPixelBuffer is obtained from a CMSampleBuffer. It's width and…
SePröbläm
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Creating copy of CMSampleBuffer in Swift returns OSStatus -12743 (Invalid Media Format)

I am attempting to perform a deep clone of CMSampleBuffer to store the output of a AVCaptureSession. I am receiving the error kCMSampleBufferError_InvalidMediaFormat (OSStatus -12743) when I run the function CMSampleBufferCreateForImageBuffer. I…
Rob
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CMSampleBuffer to byte-array in Swift

I'm trying to implement a vidoestream for a multipeer connectivity app. The captured frame will be compressed by VTCompressionSession and my callback is being called. Now my CMSamplebuffer contains a CMBlockBuffer and i could extract the NALUs etc.…
JeWol
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Convert from CMSampleBuffer to NSData image without exceeding 50MB of memory

Error exceeding memory allowance when processing CMSampleBuffer to NSData conversion in RPBroadcastSampleHandler. Error code: Thread 7: EXC_RESOURCE RESOURCE_TYPE_MEMORY (limit = 50 MB, unused = 0x0) I am processing the function of converting a…
thachonline
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Appropriately Release Buffers From AVCaptureDataOutputSynchronizerDelegate Due to Out Of Buffers

I am using AVCaptureDataOutputSynchronizerDelegate to handle capturing data for video, depth and metadata private let videoDataOutput = AVCaptureVideoDataOutput() private let depthDataOutput = AVCaptureDepthDataOutput() private let…
impression7vx
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When reading frames from a video on an iPad with AVAssetReader, the images are not properly oriented

A few things I want to establish first: This works properly on multiple iPhones (iOS 10.3 & 11.x) This works properly on any iPad simulator (iOS 11.x) What I am left with is a situation where when I run the following code (condensed from my…
CodeBender
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iOS: convert UIImage to CMSampleBuffer

Some questions address how to convert a CMSampleBuffer to a UIImage, but there are no answers on how to do the reverse, i.e., convert UIImage to CMSampleBuffer. This question is different from similar ones because the code below provides a starting…
Crashalot
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CIContext render: toCVPixelBuffer: bounds: colorSpace: function does not work for images with alpha channel

I'm trying to add a watermark/logo on a video that I'm recording using AVFoundation's AVCaptureVideoDataOutput.The problem I'm having is that the transparent parts of the UIImage are black once written to the video.What I'm doing wrong…
M. Arman
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Set rate at which AVSampleBufferDisplayLayer renders sample buffers

I am using an AVSampleBufferDisplayLayer to display CMSampleBuffers which are coming over a network connection in the h.264 format. Video playback is smooth and working correctly, however I cannot seem to control the frame rate. Specifically, if I…
Amos Joshua
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Adding filters to video with AVFoundation (OSX) - how do I write the resulting image back to AVWriter?

Setting the scene I am working on a video processing app that runs from the command line to read in, process and then export video. I'm working with 4 tracks. Lots of clips that I append into a single track to make one video. Let's call this the…
Tim Bull
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How to save encoded CMSampleBuffer samples to mp4 file on iOS

I'm using the VideoToolbox framework to retrieve data from AVCaptureSession and encode it to h264 and acc. I'm at a point where I: obtain data using the delegate method func captureOutput(_ captureOutput: AVCaptureOutput, didOutput sampleBuffer:…
Grzegorz Aperliński
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How to manually release CMSampleBuffer

This code leads to memory leak and app crash: var outputSamples = [Float]() assetReader.startReading() while assetReader.status == .reading { let trackOutput = assetReader.outputs.first! if let sampleBuffer =…
DmitryoN
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Value of type 'CMSampleBuffer' has no member 'imageBuffer'

I am currently working on a project that uses a live camera view in Swift. I used some code I found on GitHub to give me that live camera view, and it works great on my MacBook Pro running Mojave. I have all my files stored on an external HDD, so I…
Thijs van der Heijden
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How to get ImageBuffer correctly in Swift now with CMSampleBufferGetImageBuffer?

'CMSampleBufferGetImageBuffer' has been replaced by property 'CMSampleBuffer.imageBuffer' CMSampleBufferGet.ImageBuffer doesn't work :) It seems parameters also being changed regarding to Swift 4.2. guard let pixelBuffer: CVPixelBuffer =…
J A S K I E R
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Any way to convert UIImage to CMSampleBuffer on Swift?

I'm using ABBYY OCR SDK and it's great at text recognition direct from camera from CMSampleBuffer in: func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputSampleBuffer sampleBuffer: CMSampleBuffer!, from connection: AVCaptureConnection!)…
Dmitrii Z
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