CoreAnimation, AVFoundation and ability to make Video export

Question

I\'m looking for the correct way to export my pictures sequence into a quicktime video.

I know that AV Foundation have the ability to merge or recombine videos and also

Answer 1

I found the AVVideoCompositionCoreAnimationTool class that have the ability to take a CoreAnimation and reencode it as a video

My understanding was that this instead was only able to take CoreAnimation and add it to an existing video. I just checked the docs, and the only methods available require a video layer too.

EDIT: yep. Digging in docs and WWDC videos, I think you should be using AVAssetWriter instead, and appending images to the writer. Something like:

AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:[NSURL fileURLWithPath:somePath] fileType:AVFileTypeQuickTimeMovie error:&error];

NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecH264, AVVideoCodecKey, [NSNumber numberWithInt:320], AVVideoWidthKey, [NSNumber numberWithInt:480], AVVideoHeightKey, nil];
AVAssetWriterInput* writerInput = [[AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings] retain];

[videoWriter addInput:writerInput];

[videoWriter startWriting];
[videoWriter startSessionAtSourceTime:CMTimeMakeWithSeconds(0, 30)]
[writerInput appendSampleBuffer:sampleBuffer];
[writerInput markAsFinished];
[videoWriter endSessionAtSourceTime:CMTimeMakeWithSeconds(60, 30)];
[videoWriter finishWriting];

Answer 2

maybe you need a fake movie that contains totally black frame to fill the video layer, and then add a CALayer to manpiulate the images