Stack Overflow
Stack Overflow

Questions tagged [video-toolbox]

The Video Toolbox framework (VideoToolbox.framework) includes direct access to hardware video encoding and decoding in iOS and OSX.

117 questions
0
votes
1 answer

CVBuffer is nil in call back of h264 decoder

When i try to decode the raw h264 stream , CVBuffer gives me nil on callback, and this only happen on the real device(iPhone , iPad) and not on the simulator. Any suggestions?!
LeoNard
  • 230
  • 1
  • 9
0
votes
1 answer

Scale CMSampleBuffer Size Without Passing the Memory Limit Of Broadcast Extension

I am developing an app that sends pixel buffers from the Broadcast Upload Extension to OpenTok. When I run my broadcast extension it hits its memory limit in seconds. I have been looking for ways to reduce the size and scale of CMSampleBuffers and…
Mehmet Baykar
  • 367
  • 3
  • 11
0
votes
1 answer

VideoToolbox HEVC decoding failing for iOS14 on device

So while I'm sure I'm not about to provide enough info for anyone to fix my specific code, what I am itching to know is this: Does anyone know what might have happened to iOS14 to change HEVC decoding requirements?? I have a decoder built using…
Mete
  • 5,495
  • 4
  • 32
  • 40
0
votes
1 answer

NVIDIA NVENC (Media Foundation) encoded h.264 frames not decoded properly using VideoToolbox

I am facing the same problem as described here when trying to decode a frame on iPad Pro OS v14.3 (I am also using Olivia Stork's example): 25% of the picture data is decoded correctly, the rest of the picture is just green. The decoded image on…
RobX
  • 51
  • 4
0
votes
0 answers

Getting NALU from H.264 RTSP-Stream with FFmpeg and VideoToolbox in Swift

Im very new to video processing and now I am stuck decoding my H.264 RTSP-Stream with FFmpeg and VideoToolbox in Swift. Currently I am a bit overwhelmed extracting sps and pps -> Where are they stored? I have the following options getting data -…
Chris
  • 227
  • 2
  • 16
0
votes
2 answers

Is it possible to control the conversion of RGB to YUV matrix in VideoToolBox？

I found that different Iphone hardware encoders have different matrices for converting input RGB to YUV.That is, in the function OSStatus VTCompressionSessionEncodeFrame(VTCompressionSessionRef session, CVImageBufferRef imageBuffer, CMTime…
马学睿
  • 1
  • 4
0
votes
0 answers

Instance member x cannot be used on type y

I have been trying to make a compression callback which sends the compressed data to a different part of the process, but when I put the line to send the data I get back this error Instance member 'ptManager' cannot be used on type…
Asra
  • 151
  • 1
  • 11
0
votes
0 answers

How do you Apply H.264 Compression to a CMSampleBuffer

I have been trying to apply H.264 encoding to a CMSampleBuffer using VideoToolBox in Swift, I am very new to Swift and do not know how to do this if the compression turns the CMSampleBuffer into a CVPixelBuffer that is fine too as I need to turn it…
Asra
  • 151
  • 1
  • 11
0
votes
2 answers

AddressSanitizer: heap-use-after-free only on Release archive

I have created an example of my class: https://github.com/ChoadPet/H.264-Decoding When I build my application with DEBUG configuration everything is working fine, but when I archive RELEASE it's crashing on this line: let status =…
vpoltave
  • 1,612
  • 3
  • 14
  • 31
0
votes
1 answer

Video Tool Box. pixel transfer, when to release source buffer?

One simple straight question, when to release source pixelbuffer after transferred image to avoid crash: //pixel_buffer is the original CVPixelBufferCreate(kCFAllocatorDefault, CVPixelBufferGetWidth(pixel_buffer), …
Steven
  • 468
  • 4
  • 14
0
votes
0 answers

Analyze frames colors displayed in AVSampleBufferDisplayLayer. Image Buffer is nil

I want to analyze colors displayed in AVSampleBufferDisplayLayer which gets frames from the data source which I don't control. I've made my own subclass of this class and override func enqueue(_ sampleBuffer: CMSampleBuffer) to get my hands on…
msmialko
  • 1,439
  • 2
  • 20
  • 35
0
votes
1 answer

iOS Swift VideoToolBox decompress frame EXC_BAD_ADDRESS error

I was trying to convert CMSampleBuffer to Data over the internet and create a copy of that.I already compressed the camera capture's CMSampleBuffer by VTCompressionSession with h264.Now I constructed CMSampleBuffer, created VTDecompressionSession…
user9855122
  • 21
  • 3
0
votes
1 answer

Decompressed error: Error Domain=NSOSStatusErrorDomain Code=-12909

I am using H264 algorithm below is the link which I am referring to decompress video using VideoToolbox framework https://stackoverflow.com/a/29525001/1679255 Not all a few videos are stuck in a specific position. Below is the error logs which i…
Mohammed Ebrahim
  • 849
  • 1
  • 12
  • 22
0
votes
1 answer

iOS 13.1.3 VTDecompressionSessionDecodeFrame can't decode right

CVPixelBufferRef outputPixelBuffer = NULL; CMBlockBufferRef blockBuffer = NULL; void* buffer = (void*)[videoUnit bufferWithH265LengthHeader]; OSStatus status = CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault, …
Lara Wang
  • 1
  • 2
0
votes
0 answers

kVTCompressionPropertyKey_DataRateLimits property not being respected by hardware encoder, macOS

I am working on a macOS project that uses hardware acceleration for video encoding, using VideoToolbox. I have tried controlling the bitrate using kVTCompressionPropertyKey_AverageBitRate and kVTCompressionPropertyKey_DataRateLimits, but after many…
LarryW
  • 89
  • 9
1 2 3 4 5 6
7
8