是否以mp4格式录制、保存和/或转换视频？
是否以mp4格式录制、保存和/或转换视频？
提问于 2013-11-29 17:45:08
我有以下问题-我正在尝试创建一个录制视频的应用程序，然后将其保存到相机胶卷，之后我将该视频上传到web上。问题是，唯一支持的格式是"mp4"，但我的视频是"mov“。
所以我的问题是如何将摄像头中的视频保存为"mp4“格式，或者以"mov”格式保存，然后将其转换为"mp4“格式。
下面是我的代码：
- 这是我打开摄像头的方式：
picker = [UIImagePickerController alloc ]；picker.sourceType = UIImagePickerControllerSourceTypeCamera；picker.delegate = self；picker.showsCameraControls = YES；picker.allowsEditing = YES；picker.mediaTypes = [NSArray alloc：(NSString *) kUTTypeMovie，nil]；self presentViewController:picker动画:YES video是我保存视频的方式：
NSString *媒体类型=信息objectForKey: UIImagePickerControllerMediaType；if (CFStringCompare ((__bridge_retained CFStringRef) mediaType，kUTTypeMovie，0) == kCFCompareEqualTo) { NSString *moviePath = [info objectForKey:UIImagePickerControllerMediaURL路径]；videoURL = infoUIImagePickerControllerMediaURL；if UISaveVideoAtPathToSavedPhotosAlbum(moviePath，{mediaType，kUTTypeMovie，==)；}} nextScreenButton设置标题：@“ПРОДЪЛЖИ”forState:UIControlStateNormal；self dismissViewControllerAnimated:YES completion:nil;
提前感谢！
回答 4
Stack Overflow用户
回答已采纳
发布于 2013-11-29 18:14:41
你做的事情是对的..现在，您需要将此mov文件转换为mp4，如下所示。
NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
NSString *videoPath1 = @"";
if (CFStringCompare ((__bridge_retained CFStringRef) mediaType, kUTTypeMovie, 0) == kCFCompareEqualTo)
{
if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(moviePath))
{
NSString *docDir = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString *moviePath = [[info objectForKey:UIImagePickerControllerMediaURL] path];
videoPath1 =[NSString stringWithFormat:@"%@/xyz.mov",docDir];
NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
NSData *videoData = [NSData dataWithContentsOfURL:videoURL];
[videoData writeToFile:videoPath1 atomically:NO];
// UISaveVideoAtPathToSavedPhotosAlbum(moviePath, self, nil, nil);
}
}
AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:videoPath1] options:nil];
NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:avAsset];
if ([compatiblePresets containsObject:AVAssetExportPresetLowQuality])
{
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]initWithAsset:avAsset presetName:AVAssetExportPresetPassthrough];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
videoPath = [NSString stringWithFormat:@"%@/xyz.mp4", [paths objectAtIndex:0]];
exportSession.outputURL = [NSURL fileURLWithPath:videoPath];
NSLog(@"videopath of your mp4 file = %@",videoPath); // PATH OF YOUR .mp4 FILE
exportSession.outputFileType = AVFileTypeMPEG4;
// CMTime start = CMTimeMakeWithSeconds(1.0, 600);
// CMTime duration = CMTimeMakeWithSeconds(3.0, 600);
// CMTimeRange range = CMTimeRangeMake(start, duration);
// exportSession.timeRange = range;
// UNCOMMENT ABOVE LINES FOR CROP VIDEO
[exportSession exportAsynchronouslyWithCompletionHandler:^{
switch ([exportSession status]) {
case AVAssetExportSessionStatusFailed:
NSLog(@"Export failed: %@", [[exportSession error] localizedDescription]);
break;
case AVAssetExportSessionStatusCancelled:
NSLog(@"Export canceled");
break;
default:
break;
}
UISaveVideoAtPathToSavedPhotosAlbum(videoPath, self, nil, nil);
[exportSession release];
}];
}
[nextScreenButton setTitle:@"ПРОДЪЛЖИ" forState:UIControlStateNormal];
[self dismissViewControllerAnimated:YES completion:nil];Stack Overflow用户
发布于 2016-09-05 18:59:06
下面是将mov视频转换为mp4的代码，用于swift
func encodeVideo(videoURL: NSURL) {
let avAsset = AVURLAsset(URL: videoURL, options: nil)
var startDate = NSDate()
//Create Export session
exportSession = AVAssetExportSession(asset: avAsset, presetName: AVAssetExportPresetPassthrough)
// exportSession = AVAssetExportSession(asset: composition, presetName: mp4Quality)
//Creating temp path to save the converted video
let documentsDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
let myDocumentPath = NSURL(fileURLWithPath: documentsDirectory).URLByAppendingPathComponent("temp.mp4").absoluteString
let url = NSURL(fileURLWithPath: myDocumentPath)
let documentsDirectory2 = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0] as NSURL
let filePath = documentsDirectory2.URLByAppendingPathComponent("rendered-Video.mp4")
deleteFile(filePath)
//Check if the file already exists then remove the previous file
if NSFileManager.defaultManager().fileExistsAtPath(myDocumentPath) {
do {
try NSFileManager.defaultManager().removeItemAtPath(myDocumentPath)
}
catch let error {
print(error)
}
}
url
exportSession!.outputURL = filePath
exportSession!.outputFileType = AVFileTypeMPEG4
exportSession!.shouldOptimizeForNetworkUse = true
var start = CMTimeMakeWithSeconds(0.0, 0)
var range = CMTimeRangeMake(start, avAsset.duration)
exportSession.timeRange = range
exportSession!.exportAsynchronouslyWithCompletionHandler({() -> Void in
switch self.exportSession!.status {
case .Failed:
print("%@",self.exportSession?.error)
case .Cancelled:
print("Export canceled")
case .Completed:
//Video conversion finished
var endDate = NSDate()
var time = endDate.timeIntervalSinceDate(startDate)
print(time)
print("Successful!")
print(self.exportSession.outputURL)
default:
break
}
})
}
func deleteFile(filePath:NSURL) {
guard NSFileManager.defaultManager().fileExistsAtPath(filePath.path!) else {
return
}
do {
try NSFileManager.defaultManager().removeItemAtPath(filePath.path!)
}catch{
fatalError("Unable to delete file: \(error) : \(__FUNCTION__).")
}
}Swift 3
func encodeVideo(_ videoURL: URL) {
let avAsset = AVURLAsset(url: videoURL, options: nil)
let startDate = Foundation.Date()
//Create Export session
exportSession = AVAssetExportSession(asset: avAsset, presetName: AVAssetExportPresetPassthrough)
// exportSession = AVAssetExportSession(asset: composition, presetName: mp4Quality)
//Creating temp path to save the converted video
let documentsDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
let myDocumentPath = URL(fileURLWithPath: documentsDirectory).appendingPathComponent("temp.mp4").absoluteString
let url = URL(fileURLWithPath: myDocumentPath)
let documentsDirectory2 = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] as URL
let filePath = documentsDirectory2.appendingPathComponent("rendered-Video.mp4")
deleteFile(filePath)
//Check if the file already exists then remove the previous file
if FileManager.default.fileExists(atPath: myDocumentPath) {
do {
try FileManager.default.removeItem(atPath: myDocumentPath)
}
catch let error {
print(error)
}
}
exportSession!.outputURL = filePath
exportSession!.outputFileType = AVFileTypeMPEG4
exportSession!.shouldOptimizeForNetworkUse = true
let start = CMTimeMakeWithSeconds(0.0, 0)
let range = CMTimeRangeMake(start, avAsset.duration)
exportSession.timeRange = range
exportSession!.exportAsynchronously(completionHandler: {() -> Void in
switch self.exportSession!.status {
case .failed:
print("%@",self.exportSession?.error)
case .cancelled:
print("Export canceled")
case .completed:
//Video conversion finished
let endDate = Foundation.Date()
let time = endDate.timeIntervalSince(startDate)
print(time)
print("Successful!")
print(self.exportSession.outputURL)
self.mediaPath = self.exportSession.outputURL?.path as NSString!
//self.mediaPath = String(self.exportSession.outputURL!)
// self.mediaPath = self.mediaPath.substringFromIndex(7)
default:
break
}
})
}
func deleteFile(_ filePath:URL) {
guard FileManager.default.fileExists(atPath: filePath.path) else {
return
}
do {
try FileManager.default.removeItem(atPath: filePath.path)
}catch{
fatalError("Unable to delete file: \(error) : \(#function).")
}
}Stack Overflow用户
发布于 2015-12-19 19:40:55
您可以在此处指定压缩视频的视频类型、质量和输出url。
请参阅以下方法：
- (void) saveVideoToLocal:(NSURL *)videoURL {
@try {
NSArray *documentsDirectory = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docPath = [documentsDirectory objectAtIndex:0];
NSString *videoName = [NSString stringWithFormat:@"sampleVideo.mp4"];
NSString *videoPath = [docPath stringByAppendingPathComponent:videoName];
NSURL *outputURL = [NSURL fileURLWithPath:videoPath];
NSLog(@"Loading video");
[self convertVideoToLowQuailtyWithInputURL:videoURL outputURL:outputURL handler:^(AVAssetExportSession *exportSession) {
if (exportSession.status == AVAssetExportSessionStatusCompleted) {
NSLog(@"Compression is done");
}
}];
}
@catch (NSException *exception) {
NSLog(@"Exception :%@",exception.description);
}
}
//---------------------------------------------------------------
- (void)convertVideoToLowQuailtyWithInputURL:(NSURL*)inputURL outputURL:(NSURL*)outputURL handler:(void (^)(AVAssetExportSession*))handler {
[[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil];
AVURLAsset *asset = [AVURLAsset URLAssetWithURL:inputURL options:nil];
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetPassthrough];
exportSession.outputURL = outputURL;
exportSession.outputFileType = AVFileTypeMPEG4;
[exportSession exportAsynchronouslyWithCompletionHandler:^(void) {
handler(exportSession);
}];
}可以，您可以使用AVAssetExportSession压缩视频。在这里，我将压缩视频保存到应用程序的document directory。你可以在this code中查看它的工作细节。
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原文链接：
https://stackoverflow.com/questions/20282672
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