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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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AVAssetWriter sometimes fails with status AVAssetWriterStatusFailed. Seems random

I'm writing a MP4 video file with a AVAssetWriter using a AVAssetWriterInputPixelBufferAdaptor. The source is a video from a UIImagePickerController, either freshly captured from the camera or from the asset library. Quality right now is…
Kasper Welner
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iPhone - AVAssetWriter - Error creating movie from photos at 1920×1080 pixels

I am trying to create a movie from some pictures. It works just fine with hd pictures ({720, 1280}) or lower resolutions . But when i try to create the movie with full hd pictures {1080, 1920} , the video is scrambled. Here is a link to see how it…
flaviusilaghi
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Using AVAssetWriter to create QuickTime movie from raw H.264 / AAC files

Using Mac OSX Objective-C, I'm trying to create a command line tool that takes a single H.264 and a single AAC file as inputs - encoded from the same source material - and, using AVAssetWriter, create a single QuickTime-compatible mov (and/or m4v)…
Chuck at Cimarron Systems
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RTP iPhone camera - How to read AVAssetWriter file while its being written?

I'm trying to stream RTSP/RTP iPhone camera capture to a Wowza server. Apple's API does not allow direct access to H264 encoded frames, but only allow you to write it into a container '.mov' file. Either way, I cannot get access to that file content…
Avishay Cohen
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Performance issues when using AVCaptureVideoDataOutput and AVCaptureAudioDataOutput

I'm having lag issues when I'm recording audio+video by using AVCaptureVideoDataOutput and AVCaptureAudioDataOutput. Sometimes the video blocks for a few milliseconds, sometimes the audio is not in sync with the video. I inserted some logs and…
user711495
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Optimization of CVPixelBufferRef

I am working on a project in which I generate a video from UIImage, with code I found around here, and I am struggling for some days now in order to optimize it (for about 300 images, it takes like 5 minutes on the simulator, and simply crashes on…
Grhyll
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What data does AVAssetWriter metadata expect?

I am trying to add metadata to a video I am transcoding via AVAssetWriter. I tried creating AVMutableMetadataItem object, inserting it in an array and setting metadata property of the AVAssetWriter object. The result file does not include the…
Oren Meiri
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Rotate AVAssetWriter's output 180 deg about the x-axis

I'm creating a Quicktime movie file using AVAssetWriter. Currently the output video is "upside down". In theory I can correct this by rotating the video 180 degrees about the horizontal axis (essentially "flipping" the video). What's the best way to…
SundayMonday
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Capturing the screen with AVAssetWriter-- Works fine on simulator but on device creates black video

i m trying to capture the frame buffer data and convert into video for my iphone game.. i m using AVAssetWriter to accomplish this thing. The code is working fine on simulator but not on device itself.. on device it generates a black video i m using…
Tornado
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AVAssetImageGeneratorCompletionHandler - how to set or return variables?

i´m using the AVAssetImageGenerator to get images from a movieclip without playing it before. Now i´ve got a question how to set up variables in the loop of a handler? Is it possible? I´m getting this error message and have no idea what does that…
geforce
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Is it possible to use a quality between AVAssetExportPresetMediumQuality and AVAssetExportPresetHighestQuality with AVAssetExportSession?

I am using AVAssetExportSession to export a video out of my iOS app, like this: AVAssetExportSession *exportSession=[AVAssetExportSession exportSessionWithAsset:composition presetName:AVAssetExportPresetMediumQuality]; I want to upload the exported…
Walchy
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iOS how to correctly handle orientation when capturing video using AVAssetWriter

I am making a sample application that utilizes AVFoundation to record video. The whole point is so I can have more control over how the video is recorded. In my sample project I have the video capturing but am struggling with handling orientation…
miken.mkndev
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Swift Video Resizer AVAsset

I have this code that resizes a video from 1280 x 720 to 640 x 360 But i want a resize with no crop. Is there a way to do a full resize the don't crop ? Here's the code class func resizer(inputURL : NSURL , completion: (outPutURL : NSURL?) -> Void…
unwosu
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AVAssetWriter continuous segments

I want to record a series of clips that when played together via a video player or ffmpeg -f concat play back seemlessly. In either scenario right now, I'm getting a very noticeable audio hiccup at each segment join point. My current strategy is to…
Stefan Kendall
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AVAssetWriterInput - black screen, 46 hours long

I'm trying to take an AVCaptureSession and encode to mp4. It seems like this should be straightforward, and I'm trying to encode a single 960x540 video stream; I'm not worried about audio for the purpose of this issue. When I run the following code…
Stefan Kendall
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