Stack Overflow
Stack Overflow

Questions tagged [avassetwriter]

on OS X API, you use an AVAssetWriter object to write media data to a new file of a specified audiovisual container type, such as a QuickTime movie file or an MPEG-4 file, with support for automatic interleaving of media data for multiple concurrent tracks

529 questions
10
votes
1 answer

AVAssetWriter fails once App goes in background

I am working on iOS app in which i am creating video from images. I am using AVAssetWriter to achieve this. Everything works fine. But When app goes in background and switched back, the video writing fails. AVAssetWriter's…
Unnati
  • 2,441
  • 17
  • 37
10
votes
2 answers

AvFoundation - How to connect AVCaptureSession and AVAssetWriter?

I'm trying to use AVCaptureSession to capture video from the camera and then I would like to use AVAssetWriter to write the results to a file (specifically, use multiple AVAssetWriters to write the capture to chunk videos, but we don't need to…
golmschenk
  • 11,736
  • 20
  • 78
  • 137
10
votes
1 answer

AVAssetWriter How to write down-sampled/compressed m4a/mp3 files

I'm trying to take a local m4a or mp3 file and compress/down-sample this file (for the purposes of making a smaller file). Originally, I was using the AVAssetExportSession to export an AVAsset to a temp directory, but I didn't have any control over…
Dfowj
  • 739
  • 9
  • 25
9
votes
2 answers

AVAssetWriterInputPixelBufferAdaptor pixelBufferPool goes NULL after some time

I'm using the pixelBufferPool within an AVAssetWriterInputPixelBufferAdaptor to create pixel buffers for use with the append method. After creating 4 buffers, the pixelBufferPool property becomes NULL; I setup my writer, input and adaptor like…
davidbitton
  • 818
  • 10
  • 20
9
votes
2 answers

AVAssetWriterInput appendSampleBuffer: Cannot append sample buffer: Must start a session (using -AVAssetWriter startSessionAtSourceTime:) first'

I'm using ARVideoKit to record a screen (ReplayKit won't work for this) and sometimes I record and save with no problem. Other times I record and when I go to save I get a crash: ** Terminating app due to uncaught exception…
Lance Samaria
  • 17,576
  • 18
  • 108
  • 256
9
votes
6 answers

AVAssetWriterInputPixelBufferAdaptor returns null pixel buffer pool

I'm sure something's wrong with my buffer attributes, but it's not clear to me what -- it's not well documented what's supposed to go there, so I'm guessing based on CVPixelBufferPoolCreate -- and Core Foundation is pretty much a closed book to me. …
David Moles
  • 48,006
  • 27
  • 136
  • 235
9
votes
2 answers

Issue with setting and retrieving the value of AVMetadataCommonKeyCreator

I have a video recording app for the iPhone. I am using AVAssetWriter for writing the recorded video data to a file. I am also interested in embedding custom metadata to the file. For eg: I want to identify my application as the creator of the…
Sahana Kamath
  • 201
  • 2
  • 8
9
votes
4 answers

OpenGL to video on iPhone

I'm currently working on a project to convert a physics simulation to a video on the iPhone itself. To do this, I'm presently using two different loops. The first loop runs in the block where the AVAssetWriterInput object polls the EAGLView for…
aToz
  • 2,463
  • 1
  • 24
  • 34
9
votes
2 answers

Making a real slow motion video that are all slow motion

I am creating this app of mine and shooting videos at 120 and 240 fps. When I watch these videos on my mac I see these markers below the timeline. These markers are editable and represent the area that is in slow motion. So, the video starts at…
Duck
  • 34,902
  • 47
  • 248
  • 470
9
votes
2 answers

How would I put together a video using the AVAssetWriter in swift?

I'm currently making a small app that timelapses the webcam on my mac, saves the captured frame to png, and I am looking into exporting the captured frames as a single video. I use CGImage to handle the original images and have them set in an array…
Luke Parker
  • 126
  • 1
  • 1
  • 7
9
votes
3 answers

Rotating video without rotating AVCaptureConnection and in the middle of AVAssetWriter session

I'm using PBJVision to implement tap-to-record video functionality. The library doesn't support orientation yet so I'm in the process of trying to engineer it in. From what I see, there are three ways to rotate the video - I need help on deciding…
Jai Govindani
  • 3,181
  • 21
  • 26
9
votes
1 answer

Using AVAssetWriter with raw NAL Units

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…
bsirang
  • 473
  • 4
  • 14
8
votes
0 answers

AVAssetWriterInputPixelBufferAdaptor memory management

I'm writing some frames to video with AVAssetWriterInputPixelBufferAdaptor, and when I write a lot of frames my app crashes because of memory allocation. How can I prevent that? Here is the code: AVAssetWriterInput *writerInput =…
Igor Bidiniuc
  • 1,540
  • 1
  • 16
  • 27
8
votes
0 answers

iOS: Cropping a CMSampleBufferRef before appending to AVAssetWriterInput

I'm currently experimenting with CoreImage, learning how to apply CIFilters to a camera feed. Presently I'm succeeded in taking a camera feed, applying a filter and writing the feed to an AVAssetWriter in the form of a video, but one issue I'm…
Grinneh
  • 871
  • 1
  • 8
  • 14
8
votes
3 answers

How can you make a CVPixelBuffer directly from a CIImage instead of a UIImage in Swift?

I am recording filtered video through an iPhone camera, and there is a huge increase in CPU usage when converting a CIImage to a UIImage in real time while recording. My buffer function to make a CVPixelBuffer uses a UIImage, which so far requires…
Chewie The Chorkie
  • 4,896
  • 9
  • 46
  • 90
1 2
3
…
35 36