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[英]Avoid Video Compression when Selecting Movie with UIImagePickerController?
[英]How to avoid compression after selecting video from UIImagePickerController in ios
我正在使用 UIImagePickerController 处理来自 Gallery 的 select 视频并压缩该视频。我想禁用压缩,但我找不到执行此操作的方法。 我也尝试使用 ELCImagePickerController 它正在显示视频,但它看起来像一个图像,只是没有视频图标或持续时间,就像它在 UIImagePickercontroller 中显示的那样。我该怎么做?
谢谢。
看起来不可能避免使用UIImagePickerController进行压缩。 看到这个答案:
https://stackoverflow.com/a/5893066/406152
我试过使用imagePicker.videoQuality = UIImagePickerControllerQualityTypeHigh;
但它仍然可以压缩。 啊。
编辑:
但是,您可以自己滚动。 这将允许访问原始视频文件:
iOS 8
PHFetchResult *assetsFetchResult = [PHAsset fetchAssetsWithMediaType:PHAssetMediaTypeVideo options:nil];
for (PHAsset *asset in assetsFetchResult) {
PHVideoRequestOptions *videoRequestOptions = [[PHVideoRequestOptions alloc] init];
videoRequestOptions.version = PHVideoRequestOptionsVersionOriginal;
[[PHImageManager defaultManager] requestAVAssetForVideo:asset options:videoRequestOptions resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {
// the AVAsset object represents the original video file
}];
}
请参阅PhotoKit文档,以访问照片集(时刻)和其他选项。
这是苹果公司使用PhotoKit的示例应用程序,可以将其修改为照片选择器: https : //developer.apple.com/library/ios/samplecode/UsingPhotosFramework/Introduction/Intro.html
这是GitHub上使用PhotoKit的照片选择器库,它看起来很有希望,因为它为您提供了所有选定图像/视频的PHAsset
对象: https : //github.com/guillermomuntaner/GMImagePicker
iOS 7及以下
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
[library enumerateGroupsWithTypes:ALAssetsGroupAll usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
if (group) {
// If you want, you can filter just pictures or videos
// I just need videos so I do this:
[group setAssetsFilter:[ALAssetsFilter allVideos]];
[group enumerateAssetsUsingBlock:^(ALAsset *asset, NSUInteger index, BOOL *stop){
if (asset){
// You can now add this ALAsset in your own video picker.
// Note that you can only access the ALAsset as long as
// you maintain a reference to the ALAssetsLibrary
// Or if you want to process the video, you can create an AVAsset:
NSURL *url = asset.defaultRepresentation.url;
AVAsset *videoAsset = [AVAsset assetWithURL:url];
}
}];
}
} failureBlock:^(NSError *error) {
NSLog(@"error enumerating AssetLibrary groups %@\n", error);
}];
在iOS 11中,您可以将属性videoExportPreset
设置为AVAssetExportPresetPassthrough
以获取原始图片:
if #available(iOS 11.0, *) {
picker.videoExportPreset = AVAssetExportPresetPassthrough
}
“视频压缩...”标签仅闪烁几毫秒,然后完成导出。
@迭戈·雷瑙(Diego Renau) 几乎是正确的答案。
实际上,您可以通过以下代码获得原始视频URL(非压缩版本):
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
NSString *mediaType = info[UIImagePickerControllerMediaType];
NSString *videoString = (NSString *)kUTTypeVideo;
NSString *movieString = (NSString *)kUTTypeMovie;
if ([mediaType isEqualToString:videoString] || [mediaType isEqualToString:movieString]) {
NSURL *videoRef = info[UIImagePickerControllerReferenceURL];
PHFetchResult *refResult = [PHAsset fetchAssetsWithALAssetURLs:@[videoRef] options:nil];
PHVideoRequestOptions *videoRequestOptions = [[PHVideoRequestOptions alloc] init];
videoRequestOptions.version = PHVideoRequestOptionsVersionOriginal;
[[PHImageManager defaultManager] requestAVAssetForVideo:[refResult firstObject] options:videoRequestOptions resultHandler:^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {
if ([asset isKindOfClass:[AVURLAsset class]]) {
NSURL *originURL = [(AVURLAsset *)asset URL];
// Now you have the URL of the original video.
}
}];
}
}
提醒一下,requestAVAssetForVideo调用是异步的,因此,当您要在方法调用块之外将URL与一个受阻止的变量存储在一起时,请务必小心。
在iOS 11中,您可以使用属性“ videoExportPreset”。 它不是原始的,但至少我可以获得超过1280x720的分辨率...
if #available(iOS 11.0, *) {
picker.videoExportPreset = AVAssetExportPreset1920x1080
} else {
// Fallback on earlier versions
}
//AVAssetExportPreset640x480
//AVAssetExportPreset960x540
//AVAssetExportPreset1280x720
//AVAssetExportPreset1920x1080
//AVAssetExportPreset3840x2160
通过使用以下代码,您可以获得原始视频作为AVAsset
Swift版本:
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
let phAsset = info[.phAsset] as? PHAsset
let phVideoOptions = PHVideoRequestOptions()
phVideoOptions.version = .original
PHImageManager().requestAVAsset(forVideo: phAsset!, options: phVideoOptions) { [self] asset, audioMix, info in
DispatchQueue.main.async {
if ((asset?.isKind(of: AVURLAsset.self)) != nil) {
// Now, you can use asset
}
}
}
imagePickerController.dismiss(animated: true, completion: nil)
}
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