我用UIImagePickerController一个视频从MOV到MP4进行转码,结果是:
转码失败:操作无法完成
这是代码:
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
NSLog(@"UIImagePickerController mediaType: %@", mediaType);
if ([mediaType isEqualToString:(NSString *)kUTTypeMovie]) {
NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
AVAsset *asset = [AVAsset assetWithURL:videoURL];
NSLog(@"Video Link:%@", [videoURL absoluteString]);
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetPassthrough];
if (nil == exportSession) {
@throw [NSException exceptionWithName:@"Unknown Error" reason:@"Couldn't create AVAssetExportSession" userInfo:nil];
}
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0];
NSString *destinationPath = [documentsDirectory stringByAppendingString:@"/output123.mp4"];
NSLog(@"Dest: %@", destinationPath);
NSLog(@"Supported File Types: %@", [exportSession supportedFileTypes]);
exportSession.outputURL …我在低质量转换中使用简单的视频压缩代码.我正在使用IOS-4.2.1在iphone 4中测试我的代码.问题是当我在没有断点的设备上测试我的代码时代码无法创建视频(它只是零创建kb文件或空文件)但是当我逐行使用断点检查这段代码时,它会生成一个完美的压缩视频,也可以在mac中的quicktime播放器上运行.压缩后我制作了这个视频文件的zip.
NSURL *videoURL=[[self.videourlarray objectAtIndex:i] valueForKey:UIImagePickerControllerReferenceURL];
NSURL *outputURL = [NSURL fileURLWithPath:videoFile];
[[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil];
AVURLAsset *asset = [AVURLAsset URLAssetWithURL:videoURL options:nil];
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetLowQuality];
exportSession.outputURL = outputURL;
exportSession.shouldOptimizeForNetworkUse = YES;
exportSession.outputFileType = AVFileTypeQuickTimeMovie;
[exportSession exportAsynchronouslyWithCompletionHandler:^(void)
{
NSLog(@"Export Complete %d %@", exportSession.status, exportSession.error);
[exportSession release];
}];
thanx任何帮助......
在我的应用程序中,我使用AVAssetExportSession组合两个音频文件,它在早期的ios版本中工作正常.但在ios5设备中它无法正常工作.我得到的是一个错误
AVAssetExportSessionStatusFailed: Error Domain=AVFoundationErrorDomain Code=-11820 "Cannot Complete Export" UserInfo=0x1df1c0 {NSLocalizedRecoverySuggestion=Try exporting again., NSLocalizedDescription=Cannot Complete Export}
我用于导出的代码如下所示
有没有人遇到过同样的问题？请提供宝贵的建议.我迫切需要解决这个问题..
//Export function to export the combined audios as one.
-(void)exportAudioFile:(AVComposition*)combinedComposition
{
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:combinedComposition
presetName:AVAssetExportPresetPassthrough];
NSArray *presets =[AVAssetExportSession exportPresetsCompatibleWithAsset:combinedComposition];
NSLog(@"presets======%@",presets);
NSLog (@"can export: %@", exportSession.supportedFileTypes);
NSArray *dirs = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectoryPath = [dirs objectAtIndex:0];
exportPath = [documentsDirectoryPath stringByAppendingPathComponent:@"CombinedNew.m4a"];
[[NSFileManager defaultManager] removeItemAtPath:exportPath error:nil];
exportURL = [NSURL fileURLWithPath:exportPath];
exportSession.outputURL = exportURL;
exportSession.outputFileType = @"com.apple.m4a-audio";
exportSession.shouldOptimizeForNetworkUse = YES;
[exportSession exportAsynchronouslyWithCompletionHandler:^{
NSLog …我正在制作一个视频应用程序，在其中使用AVAssetExportSession创建新视频。在创建视频时，我希望使用户能够取消视频创建。我遇到的问题是我不知道如何将取消请求发送到AVAssetExportSession，因为我假设它正在主线程上运行。一旦启动，我不知道如何发送停止请求？
我试过了但是没用
- (IBAction) startBtn
{
....
// Export
exportSession = [[AVAssetExportSession alloc] initWithAsset:[composition copy] presetName:AVAssetExportPresetHighestQuality];
[exportSession setOutputFileType:@"com.apple.quicktime-movie"];
exportSession.outputURL = outputMovieURL;
exportSession.videoComposition = mainComposition;
//NSLog(@"Went Here 7 ...");
[exportSession exportAsynchronouslyWithCompletionHandler:^{
switch ([exportSession status])
{
case AVAssetExportSessionStatusCancelled:
NSLog(@"Canceled ...");
break;
case AVAssetExportSessionStatusCompleted:
{
NSLog(@"Complete ... %@",outputURL); // moview url
break;
}
case AVAssetExportSessionStatusFailed:
{
NSLog(@"Faild=%@ ...",exportSession.error);
break;
}
case AVAssetExportSessionStatusExporting:
NSLog(@"Exporting.....");
break;
}
}];
}
- (IBAction) cancelBtn
{
exportSession = nil;
}
audio从video文件。< iOS 8.0版本中有效，但在版本中无效>= iOS 8.0。>= iOS 8.0版本中的音频？我正在从 UIImage 数组制作视频。我成功地做到了并且所有图像都显示在视频中。我正在使用 AVAssetExportSession 导出视频，该视频也可以正常工作，除非我使用 AVAssetExportSession videoComposition 属性时，视频仅显示第一张图像。这是我的代码：
func mergeAudioVideoFiles(videoUrl:NSURL, audioUrl:NSURL)->NSURL
{
let mixComposition : AVMutableComposition = AVMutableComposition()
var mutableCompositionVideoTrack : [AVMutableCompositionTrack] = []
var mutableCompositionAudioTrack : [AVMutableCompositionTrack] = []
let totalVideoCompositionInstruction : AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
//start merge
let aVideoAsset : AVAsset = AVAsset(URL: videoUrl)
let aAudioAsset : AVAsset = AVAsset(URL: audioUrl)
mutableCompositionVideoTrack.append(mixComposition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid))
mutableCompositionAudioTrack.append( mixComposition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: kCMPersistentTrackID_Invalid))
let aVideoAssetTrack : AVAssetTrack = aVideoAsset.tracksWithMediaType(AVMediaTypeVideo)[0]
let aAudioAssetTrack : AVAssetTrack = aAudioAsset.tracksWithMediaType(AVMediaTypeAudio)[0]
do{
try mutableCompositionVideoTrack[0].insertTimeRange(CMTimeRangeMake(kCMTimeZero, aVideoAssetTrack.timeRange.duration), ofTrack: aVideoAssetTrack, atTime: kCMTimeZero)
try …我目前以以下方式导出视频：
let exporter = AVAssetExportSession.init(asset: mixComposition, presetName: AVAssetExportPreset1280x720)
exporter?.outputURL = outputPath
exporter?.outputFileType = AVFileType.mp4
exporter?.shouldOptimizeForNetworkUse = true
exporter?.videoComposition = mainCompositionInst
15秒的视频消耗约20MB的数据。与Snapchat的2MB视频相比，这个数字似乎是完全不能接受的。
我已经降低了导出和捕获会话的质量（1280x720）。
该视频在自定义相机上拍摄。UIImagePickerController未使用。
AVAssetExportSession与默认设置一起使用。
有什么办法可以减小视频尺寸？非常感谢！
编辑1： 我尝试使用此库：https : //cocoapods.org/pods/NextLevelSessionExporter
不幸的是，这会造成尺寸问题，并删除了我的音频：
// Creating exporter
let exporter = NextLevelSessionExporter(withAsset: mixComposition)
exporter.outputURL = outputPath
exporter.outputFileType = AVFileType.mp4
exporter.videoComposition = mainCompositionInst
let compressionDict: [String: Any] = [
AVVideoAverageBitRateKey: NSNumber(integerLiteral: 2500000),
AVVideoProfileLevelKey: AVVideoProfileLevelH264BaselineAutoLevel as String,
]
exporter.videoOutputConfiguration = [
AVVideoCodecKey: AVVideoCodecType.h264,
AVVideoWidthKey: NSNumber(integerLiteral: 1280),
AVVideoHeightKey: NSNumber(integerLiteral: 720),
AVVideoScalingModeKey: AVVideoScalingModeResizeAspectFill,
AVVideoCompressionPropertiesKey: compressionDict
] …