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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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Video Compression ios : Reduce the size of a video usin AVAssetWriter

I am Successful in encoding a series of image captured by AVCaptureVideoPreviewLayer of AVFoundation Framework into a Video using AVAssetWriter and AVAssetWriterInput. But the size of the video is too large, Can anyone of you suggest me a tutorial…
iAviatorJose
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Removing buffer from AVAssetWriter before outputting to file

I have an app that is like Vine or Instagram Video and I am trying to delete the last recorded segment. I am using AVAssetWriter and appending the sample buffer to the asset writer input when recording but I want to allow users to delete the last…
Encore PTL
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Change AVMetadataItem

I have some files, -m4a -mp4 -mp3 etc. I want to change these details AVMetadataItem AVMetadataCommonKeyArtwork AVMetadataCommonKeyArtist I can do with AVAssetExportSession, But I need to change the directory. Is there a way I can write…
user1669335
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Core Animations with AVAssetWriter possible?

I know about the AVVideoCompositionCoreAnimationTool method to use Core animations and I made it work using AVMutableComposition, but I'm looking for a way to do the same animations through AVAssetWriter. Basically I want to create CAAnimation(s)…
John Estropia
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Get PTS from raw H264 mdat generated by iOS AVAssetWriter

I'm trying to simultaneously read and write H.264 mov file written by AVAssetWriter. I managed to extract individual NAL units, pack them into ffmpeg's AVPackets and write them into another video format using ffmpeg. It works and the resulting file…
kolyuchiy
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Use AVFoundation to modify audio metadata

I'm working on an app which needs to modify metadata of audio files. I have played with Apple's official demo AVReaderWriterOSX. I have tried to set the metadata of AVAssetWriterInput and AVAssetWriter, but I still can't make it work to write…
nonamelive
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Can someone explain source time, movie time, presentation time, etc.?

In my iOS app, I need to save an image as a short video segment. I have this working using AVAssetWriter and AVAssetWriterPixelBufferAdaptor, thanks to some of the great posts on this site, but I've had to fudge the start and end session times, and…
John
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how to record screen video as like Talking Tomcat application does in iphone?

hey i m trying the record the gameplay of my game so that i can upload its video to youtube from device itself...m trying to do same thing as Talking tomcat app for iphone..recording the video then playing it ,etc... i m using glReadPixels() for…
Tornado
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Hold multiple Frames in Memory before sending them to AVAssetWriter

I need to hold some video frames from a captureSession in memory and write them to a file when 'something' happens. Similar to this solution, i use this code to put a frame into a NSMutableArray: - (void)captureOutput:(AVCaptureOutput…
jsB
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Real-time AVAssetWriter synchronise audio and video when pausing/resuming

I am trying to record a video with sound using iPhone's front camera. As I need to also support pause/resume functionality, I need to use AVAssetWriter. I've found an example online, written in Objective-C, which almost achieves the desired…
Andriy Gordiychuk
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Swift: Merge Videos back-to-back with AVAssetExportSession()

I have an array of video recordings stored as AVURLAsset and I want to merge the videos into 1 clip so that they play back to back with no time in-between videos. Below is what I'm hoping to do, but it is only showing the 1st video. Note: I want the…
nicksarno
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How to add colorProfile with AVAssetWriter to video recorded from screen using CGDisplayStream

I've written a screen-recording app that writes out H.264 movie files using VideoToolbox and AVWriter. The colors in the recorded files are a bit dull compared to the original screen. I know that this if because the colorProfile is not stored in the…
Thies Ḉ Arntzen
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Fastest way to record video from SCNView

I have SCNView with some object in the middle of screen, user can rotate it, scale, etc. I want to record all this movements in video and add some sound in realtime. Also I want to record only middle part of SCNView (e.g. SCNView frame is 375x812…
Joker
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AVAssetWriterInput with more than 2 channels

Does someone know how to use the AVAssetWriterInput init with more than 2 channels? I'm trying to init an audioInput, to add it after on AVAssetWriter this way: let audioInput = AVAssetWriterInput(mediaType: AVMediaTypeAudio, outputSettings:…
Anne Kariny Silva Freitas
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How to set expected framerate to AVAssetWriterInput

I have an app which encodes videos in different ways and saves it to Photos library - it can cut specific time range, add pictures, text, etc. Everything is working perfectly till I try to encode video 120+ fps. The problem is that video appears to…
Eugene Alexeev
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