Questions tagged [cmsamplebufferref]
71 questions
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Understanding CMSampleBuffer & didOutputSampleBuffer
I'm trying to understand how does CMSampleBuffer works. Eventually i'm looking for the most efficient way to change the CMSampleBuffer pixels (which are at kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange format), into grayScale pixels.
The final…
Roi Mulia
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A video with QuickTime play no sound, with VLC play on the sound
First I use AVCaptureSession capture vedio and audio from camero and micophone.
Then delegate method code below:
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer…
alpine
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Writing silent CMSampleBuffer causes crash: CrashIfClientProvidedBogusAudioBufferList
i'm recording Video/Audio using AVAssetwriter and want to be able to write silent Sample Buffers. I'm not that experienced in CoreAudio, so i'm having trouble coming up with a working solution.
The idea is to keep recording video when an audio…
Legi
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CMSampleBufferGetSampleTimingInfo: No duration?
I have a live stream, and CMSampleBufferGetSampleTimingInfo gives a duration with CMTime(value=0, timescale=0) for video.
For audio, I get 1024 samples at once, but CMSampleBufferGetSampleTimingInfo(sampleBuffer, index, &timingInfo) gives the exact…
Stefan Kendall
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Get current video duration from CMSampleBufferRef
How can I get current recorded video duration from CMSampleBufferRef in delegate method
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection…
Malik Boy
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Scale and crop CMSampleBufferRef
I am using AvFoundation & AVCaptureVideoDataOutputSampleBufferDelegate to record a video.
I need to implement Zoom functionality in the video being recorded. I am using the following delegate method.
- (void)captureOutput:(AVCaptureOutput…
iOS_DEV
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Need help in video calling app for iOS
I am creating a simple video calling app where audio/video will stream from one device to other but problem is I don't know how video calling works especially how to get going with it in iOS .
Until now I have captured video by using…
sajwan
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Does exist something like cvShowImage for iOS?
I'm processing images (using AVFoundation and OpenCV on iOS) and I want to simply display contents of CMSampleBufferRef (or IplImage) to screen.
Simply: I just want to display (like with OpenCV's cvShowImage()) non-converted image to see if I'm not…
user961912
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AVFoundation image captured is dark
On osx i use AVFoundation to capture image from a USB camera, all work fine, but the image I get is darker compared to live video.
Device capture configuration
-(BOOL)prepareCapture{
captureSession = [[AVCaptureSession alloc] init];
NSError…
Mex
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How could save the CMSampleBuffer to a CFArrayRef (or other container) that from didOutputSampleBuffer
I tried to save the CMSampleBuffer from didOutputSampleBuffer, as the iOS developer docs, I copy it in CFArrayRetainCallBack like blow:
static const void * ObjectRetainCallBack(CFAllocatorRef allocator, const void *value) {
CMSampleBufferRef…
Clover.P
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I am unable to convert this objectiveC code into swift
1.I am converting a reverse audio function of objective c into swift so that I can integrate the swift code into my program but these few lines of codes are not understandable
2.This is the following objective-c code:
CMSampleBufferRef sample;
…
Nishad Arora
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