ios - 将AVAset读入帧并编译回视频

大家!在我的项目中，想法是收集视频，将其分成帧，然后逐帧(而不是主题)应用特定的效果，然后将所有内容编译回去。

使用以下代码，我可以将视频读取为帧并将它们传递给数组:

//initialize avassetreader
AVAsset *avAsset = [AVAsset assetWithURL:url];
NSError *error = nil;
AVAssetReader *reader = [[AVAssetReader alloc] initWithAsset:avAsset error:&error];

//get video track
NSArray *videoTracks = [avAsset tracksWithMediaType:AVMediaTypeVideo];
AVAssetTrack *videoTrack = [videoTracks objectAtIndex:0];

NSDictionary *options = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:kCVPixelFormatType_32BGRA] forKey:(id)kCVPixelBufferPixelFormatTypeKey];

AVAssetReaderTrackOutput *asset_reader_output = [[AVAssetReaderTrackOutput alloc] initWithTrack:videoTrack outputSettings:options];

[reader addOutput:asset_reader_output];
[reader startReading];

接下来，正如我上面说的，我逐帧阅读轨道

//while there is something to read
while ( [reader status]==AVAssetReaderStatusReading ) {


    CMSampleBufferRef sampleBuffer = [asset_reader_output copyNextSampleBuffer];
    CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);

    // Lock the base address of the pixel buffer
    CVPixelBufferLockBaseAddress(imageBuffer, 0);

    // Get the number of bytes per row for the pixel buffer
    size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);

    // Get the pixel buffer width and height
    size_t width = CVPixelBufferGetWidth(imageBuffer);
    size_t height = CVPixelBufferGetHeight(imageBuffer);

    //Generate image to edit
    unsigned char* pixel = (unsigned char *)CVPixelBufferGetBaseAddress(imageBuffer);
    CGColorSpaceRef colorSpace=CGColorSpaceCreateDeviceRGB();
    CGContextRef context=CGBitmapContextCreate(pixel, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little|kCGImageAlphaPremultipliedFirst);

    CGImageRef image = CGBitmapContextCreateImage(context);
    UIImage* myImage = [[UIImage alloc] initWithCGImage:image];
    [photos addObject:myImage];

}

我能够将所有内容放入一个数组，但是我需要将所有内容编译回视频轨道，并使用原始轨道的音频进行编译，然后保存。但是，我在网络上找不到任何有用的信息。请帮忙!

提前致谢!

最佳答案

一旦有了图像阵列，AVASsetWriter就是您的 friend 。

关于ios - 将AVAset读入帧并编译回视频，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/31272799/