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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

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Alpha channel gone when converting UIImage to CVPixelBufferRef

I'm using this code to create a movie from different uiimages with an AVAssetWriter. The codes works great but the problem is that the Alpha channel is gone when I add the images to the writer. I can't figure out if the alpha doesn't exists in the…
Michiel Timmerman
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CVPixelBufferCreate in RubyMotion

I'm attempting to recreate some of the functionality from https://github.com/Lockerios/VideoFromImage and discussed in this post: ASSETWriterInput for making Video from UIImages on Iphone Issues In the pixelBufferFromCGImage:size method, I have the…
Nader Hendawi
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Can we merge two video in AVFoundation for implementing pause and play feature functionality

Can we merge two video for implementing pause/play feature in screen recording type application in cocoa. I did't write code yet. Because first I want to be conform about it that this can be possible. First start video recording on pressing "Play…
Gauri rawat
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While merging audio, both the audio come linearly though I want it to overlay

So, I try to use the following code in a 'for' loop to overlay the audio, but they are coming in linearly, with the last attached audio coming in first. [compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, CMTimeMake(5, 1))…
rahulg
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How to create Square Video using AVAssetWriter with IOS SDK?

I want to create square video using AVAssetWriter(GPUImageMovieWriter) in IOS SDK.If i resize the video output settings as 640*640 and i got result is 640*640 size video with resolution is 480*640.how to change preset for square video output.Please…
Ramkumar Paulraj
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AVAssetWriter Error Code cannot create file

My friend is getting this error on his device after assetwriter is created- Log: AVAssetWriter: 0x1e051900, outputURL = file://localhost/var/mobile/Applications/625EA2D8-0B32-41D3-ADFE-64EA5CF47CCE/Documents/AppData/Temp/12-07-13%2011:30:07.mp4,…
user2504522
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Video creation using Array of images in iOS

I am trying to create a video from an array of images. I created a video but I have a problem in presentation time i.e CMTime. I am using following code to create a video int frameCount = 1; // Adding images here to buffer for( int i =…
subhash Amale
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AVAssetWriter can merge two video files

Do not tell me to use AVAssetExportSession, thank you. I tried this, but failed. for (int i =0; i < count; i++) { assetWriterInput = nil; assetWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo…
bing
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How can I save my video to a special folder in the photo album?

I have an iPhone app that streams video to our Wowza server. I'd like to implement a new feature that collects my video frames and on completion, saves that recording to a local folder, which will be specially titled and stored in the device's photo…
user
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GPUImageMovieWriter starting new recording

Can i reuse an existing GPUImageMovieWriter (after calling finishRecording) or is there a method to pause and resume the recording? I get error if i call startRecoding after a finishRecording. Terminating app due to uncaught exception…
Daddycat Tan Yin See
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How to store per frame data in a movie file on iOS that can be opened by Matlab?

I am performing processing on the camera output on the iPhone that I can only perform on the device. I now need to store each processed frame together with some additional information that has been provided by the processing step. Ultimately I need…
twerdster
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Audio AVAssetWriter mute

I'm trying to record audio with AVAssetWriter, and I'm getting weird skips in the output file. I've crossed checked the code with another app that does work - anybody witness this inconistant behavior? 10x!
Oded Ben Dov
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AVAssetWriter: Using an alternate encoding

I have written an application to step through (and alter) each frame of a video using AVFramework's AVAssetReader and AVAssetWriter. It works great, but I need to be able to encode the video to MPEG4. Is there a way to change the output encoding…
Tim L
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AVAssetWriter change of quality on the fly

Hey I am currently working with the AVAssetWriter and the AVAssetWriterInput. In my project I would like to use the hardware acceleration of the iPhone. Is it possible to use the AVAssetWriter to create compressed images and change the quality on…
Webchen
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AVSynchronizedLayer doesn't match AVAssetExportSession output, Why?

The problem is this: I have a AVMutableVideoComposition which has a titleLayer (CATextLayer). I want to display to the user a preview containing this title, using AVPlayerLayer and AVSynchronizedLayer. I setup the layer like this: -…
Horatiu Paraschiv
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