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POcreate video from array of UIImages and save the video to iPhone library. AVAssetLibrary +AVFoundation
 

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  1. POcreate video from array of UIImages and save the video to iPhone library. AVAssetLibrary +AVFoundation
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    <p>Problem in saving video to iPhone Library. i have an array of UIImages,and two buttons ,"convertToVideo"&amp;"saveToiPhoneLib"</p> <pre> -(IBAction) convertToVideo { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; NSString *savedVideoPath = [documentsDirectory stringByAppendingPathComponent:@"videoOutput"]; printf(" \n\n\n-Video file == %s--\n\n\n",[savedVideoPath UTF8String]); [self writeImageAsMovie:imageArray toPath:savedVideoPath size:self.view.frame.size duration:3]; } here i'm passing the imageArray and savedVideoPath to the function below -(void)writeImageAsMovie:(NSArray *)array toPath:(NSString*)path size:(CGSize)size duration:(int)duration { NSError *error = nil; AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL: [NSURL fileURLWithPath:path] fileType:AVFileTypeQuickTimeMovie error:&error]; NSParameterAssert(videoWriter); NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys: AVVideoCodecH264, AVVideoCodecKey, [NSNumber numberWithInt:size.width], AVVideoWidthKey, [NSNumber numberWithInt:size.height], AVVideoHeightKey, nil]; AVAssetWriterInput* writerInput = [[AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings] retain]; // NSDictionary *bufferAttributes = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithInt:kCVPixelFormatType_32ARGB], kCVPixelBufferPixelFormatTypeKey, nil]; AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput sourcePixelBufferAttributes:nil]; NSParameterAssert(writerInput); NSParameterAssert([videoWriter canAddInput:writerInput]); [videoWriter addInput:writerInput]; //Start a session: [videoWriter startWriting]; [videoWriter startSessionAtSourceTime:kCMTimeZero]; CVPixelBufferRef buffer = NULL; //convert uiimage to CGImage. buffer = [self pixelBufferFromCGImage:[[array objectAtIndex:0] CGImage]]; [adaptor appendPixelBuffer:buffer withPresentationTime:kCMTimeZero]; //Write samples: ...... //Finish the session: [writerInput markAsFinished]; [videoWriter finishWriting]; } generate a CVPixelBufferRef here - (CVPixelBufferRef) pixelBufferFromCGImage: (CGImageRef) image { NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey, [NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey, nil]; CVPixelBufferRef pxbuffer = NULL; CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, self.view.frame.size.width, self.view.frame.size.height, kCVPixelFormatType_32ARGB, (CFDictionaryRef) options, &pxbuffer); NSParameterAssert(status == kCVReturnSuccess && pxbuffer != NULL); CVPixelBufferLockBaseAddress(pxbuffer, 0); void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer); NSParameterAssert(pxdata != NULL); CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB(); CGContextRef context = CGBitmapContextCreate(pxdata, self.view.frame.size.width, self.view.frame.size.height, 8, 4*self.view.frame.size.width, rgbColorSpace, kCGImageAlphaNoneSkipFirst); NSParameterAssert(context); CGContextConcatCTM(context, CGAffineTransformMakeRotation(0)); CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image), CGImageGetHeight(image)), image); CGColorSpaceRelease(rgbColorSpace); CGContextRelease(context); CVPixelBufferUnlockBaseAddress(pxbuffer, 0); return pxbuffer; } </pre> <p>saving to the iPhone library</p> <pre> -(IBAction) saveToiPhoneLib { NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; NSString *getImagePath = [basePath stringByAppendingPathComponent:@"videoOutput"]; printf(" \n\n\n-Video file == %s--\n\n\n",[getImagePath UTF8String]); UISaveVideoAtPathToSavedPhotosAlbum ( getImagePath,self, @selector(video:didFinishSavingWithError: contextInfo:), nil); } - (void) video: (NSString *) videoPath didFinishSavingWithError: (NSError *) error contextInfo: (void *) contextInfo { NSLog(@"Finished saving video with error: %@", error); } </pre> <p>but while saving i m getting error message:-</p> <p>Finished saving video with error: Error Domain=ALAssetsLibraryErrorDomain Code=-3302 "Invalid data" UserInfo=0x1d59f0 {NSLocalizedFailureReason=There was a problem writing this asset because the data is invalid and cannot be viewed or played., NSLocalizedRecoverySuggestion=Try with different data, NSLocalizedDescription=Invalid data}</p> <p>please let me know my mistake. thanks in advance </p>
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