iphone – 视频错误的UIImage的NSArray在输出中有失真

概述我对编程比较陌生,虽然我对正常的功能很满意,但我对视频编辑还是全新的 所以我设法在网上找到一些代码来完成下面显示的工作： - (void)writeImagesAsMovie:(NSArray *)array {NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDirectory, YE 我对编程比较陌生,虽然我对正常的功能很满意,但我对视频编辑还是全新的

所以我设法在网上找到一些代码来完成下面显示的工作：

- (voID)writeImagesAsMovIE:(NSArray *)array {NSArray *paths = NSSearchPathForDirectorIEsInDomains(NSdocumentDirectory,NSUserDirectory,YES);Nsstring *documentDirectory = [paths objectAtIndex:0];Nsstring *saveLocation = [documentDirectory stringByAppendingString:@"/temp.mov"];if ([[NSfileManager defaultManager] fileExistsAtPath:saveLocation]) {    [[NSfileManager defaultManager] removeItemAtPath:saveLocation error:NulL];}UIImage *first = [array objectAtIndex:0];CGSize frameSize = first.size;NSError *error = nil;AVAssetWriter *vIDeoWriter = [[AVAssetWriter alloc] initWithURL:                              [NSURL fileURLWithPath:saveLocation] fileType:AVfileTypeQuickTimeMovIE                                                          error:&error];if(error) {    NSLog(@"error creating AssetWriter: %@",[error description]);}NSDictionary *vIDeoSettings = [NSDictionary dictionaryWithObjectsAndKeys:                               AVVIDeoCodecH264,AVVIDeoCodecKey,[NSNumber numberWithInt:frameSize.wIDth],AVVIDeoWIDthKey,[NSNumber numberWithInt:frameSize.height],AVVIDeoHeightKey,nil];AVAssetWriterinput *writerinput = [AVAssetWriterinput                                    assetWriterinputWithMediaType:AVMediaTypeVIDeo                                    outputSettings:vIDeoSettings];NSMutableDictionary *attributes = [[NSMutableDictionary alloc] init];[attributes setobject:[NSNumber numberWithUnsignedInt:kCVPixelFormatType_32ARGB] forKey:(Nsstring*)kCVPixelBufferPixelFormatTypeKey];[attributes setobject:[NSNumber numberWithUnsignedInt:frameSize.wIDth] forKey:(Nsstring*)kCVPixelBufferWIDthKey];[attributes setobject:[NSNumber numberWithUnsignedInt:frameSize.height] forKey:(Nsstring*)kCVPixelBufferHeightKey];AVAssetWriterinputPixelBufferAdaptor *adaptor = [AVAssetWriterinputPixelBufferAdaptor                                                 assetWriterinputPixelBufferAdaptorWithAssetWriterinput:writerinput                                                 sourcePixelBufferAttributes:attributes];[vIDeoWriter addinput:writerinput];// fixes all errorswriterinput.expectsMediaDataInRealTime = YES;//Start a session:[vIDeoWriter startWriting];[vIDeoWriter startSessionAtSourceTime:kCMTimeZero];CVPixelBufferRef buffer = NulL;buffer = [self pixelBufferFromCGImage:[first CGImage]];BOol result = [adaptor appendPixelBuffer:buffer withPresentationTime:kCMTimeZero];if (result == NO) //failes on 3GS,but works on iphone 4    NSLog(@"Failed to append buffer");if(buffer) {    CVBufferRelease(buffer);}//int reverseSort = NO;NSArray *newArray = array;int fps = 10;int i = 0;for (UIImage *image in newArray){    [NSThread sleepForTimeInterval:0.02];    if (adaptor.assetWriterinput.readyForMoreMediaData) {        i++;        CMTime frameTime = CMTimeMake(1,fps);        CMTime lastTime = CMTimeMake(i,fps);        CMTime presentTime = CMTimeAdd(lastTime,frameTime);        UIImage *imgFrame = image;//[UIImage imageWithContentsOffile:filePath] ;        buffer = [self pixelBufferFromCGImage:[imgFrame CGImage]];        BOol result = [adaptor appendPixelBuffer:buffer withPresentationTime:presentTime];        if (result == NO) //failes on 3GS,but works on iphone 4        {            NSLog(@"Failed to append buffer");            NSLog(@"The error is %@",[vIDeoWriter error]);            [NSThread sleepForTimeInterval:0.5];        }        if(buffer) {            CVBufferRelease(buffer);        }    } else {        NSLog(@"error");        i--;    }}//Finish the session:[writerinput markAsFinished];[vIDeoWriter finishWriting];CVPixelBufferPoolRelease(adaptor.pixelBufferPool);NSLog(@"MovIE created successfully");}- (CVPixelBufferRef) pixelBufferFromCGImage: (CGImageRef) image{    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:                             [NSNumber numberWithBool:YES],kCVPixelBufferCGImageCompatibilityKey,[NSNumber numberWithBool:YES],kCVPixelBufferCGBitmapContextCompatibilityKey,nil];    CVPixelBufferRef pxbuffer = NulL;    CVPixelBufferCreate(kcfAllocatorDefault,CGImageGetWIDth(image),CGImageGetHeight(image),kCVPixelFormatType_32ARGB,(__brIDge CFDictionaryRef) options,&pxbuffer);    CVPixelBufferLockBaseAddress(pxbuffer,0);    voID *pxdata = CVPixelBufferGetBaseAddress(pxbuffer);    CGcolorSpaceRef rgbcolorSpace = CGcolorSpaceCreateDeviceRGB();    CGContextRef context = CGBitmapContextCreate(pxdata,8,4*CGImageGetWIDth(image),rgbcolorSpace,kCGImageAlphaNoneskipFirst);    CGContextConcatCTM(context,CGAffinetransformMakeRotation(0));    //    CGAffinetransform flipVertical = CGAffinetransformMake(    //                                                           1,-1,CGImageGetHeight(image)    //                                                           );    //    CGContextConcatCTM(context,flipVertical);    //    CGAffinetransform flipHorizontal = CGAffinetransformMake(    //                                                             -1.0,0.0,1.0,0.0    //                                                             );    //    //    CGContextConcatCTM(context,flipHorizontal);    CGContextDrawImage(context,CGRectMake(0,CGImageGetHeight(image)),image);    CGcolorSpaceRelease(rgbcolorSpace);    CGContextRelease(context);    CVPixelBufferUnlockBaseAddress(pxbuffer,0);    return pxbuffer;}

但我遇到的问题是视频的输出有些损坏(尽管它有如下所示的有趣线条,但确实会播放)

我会非常感激任何帮助

非常感谢

托马斯

解决方法 我一直看到H264视频编码硬件存在问题,它可以破坏与已知宽高比不匹配的输入.例如,我的测试显示,如果一个视频维度小于128像素,则视频将不会编码.

我所看到的工作是128×128,192×128,240×160,480×320等.

见这page on aspect ratios

附：您可能希望使用AVAssetWriterinputPixelBufferAdaptor,因为它包含可以通过CVPixelBufferPoolCreatePixelBuffer()使用的像素缓冲池.另外,你需要断言(adaptor.pixelBufferPool);在调用startSessionAtSourceTime之后,确保您的适配器可以写入writer.

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