我有以下问题 - 我正在尝试创建一个记录视频的应用，然后将其保存到相机胶卷，之后我将该视频上传到网络。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以“mp4”格式保存相机中的视频，或将其保存在“mov”中，然后将其转换为“mp4”。
这是我的代码：
这就是我打开相机的方式：
picker = [[UIImagePickerController alloc] init];
picker.sourceType = UIImagePickerControllerSourceTypeCamera;
picker.delegate = self;
picker.showsCameraControls = YES;
picker.allowsEditing = YES;
picker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];
[self presentViewController:picker animated:YES completion:nil];
这是我保存视频的方式：
NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
if (CFStringCompare ((__bridge_retained CFStringRef) mediaType, kUTTypeMovie, 0) == kCFCompareEqualTo)
{
NSString *moviePath = [[info objectForKey:UIImagePickerControllerMediaURL] path];
videoURL = info[UIImagePickerControllerMediaURL];
if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(moviePath))
{
UISaveVideoAtPathToSavedPhotosAlbum(moviePath, self, nil, nil);
}
}
[nextScreenButton setTitle:@"ПРОДЪЛЖИ" forState:UIControlStateNormal];
[self dismissViewControllerAnimated:YES completion:nil];
提前致谢！
答案 0 :(得分：34)
你做对了..现在你需要将这个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];
答案 1 :(得分：13)
以下是将mov视频转换为mp4 for swift
的代码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).")
}
}
答案 2 :(得分：1)
Swift 5代码可在Swift中将视频转换为mp4
首先，您需要导入此
import AVFoundation
然后您可以编写此代码并将URL传递给它。
func videoConvert(videoURL: URL) {
let avAsset = AVURLAsset(url: videoURL as URL, options: nil)
let startDate = NSDate()
//Create Export session
let 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).appendingPathComponent("temp.mp4")?.absoluteString
let url = NSURL(fileURLWithPath: myDocumentPath!)
let documentsDirectory2 = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0] as NSURL
let filePath = documentsDirectory2.appendingPathComponent("VideoConvert.mp4")
deleteFile(filePath: 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)
}
}
//URL
print(filePath!.absoluteString)
exportSession!.outputURL = filePath
exportSession!.outputFileType = AVFileType.mp4
exportSession!.shouldOptimizeForNetworkUse = true
let start = CMTimeMakeWithSeconds(0.0, preferredTimescale: 0)
let range = CMTimeRangeMake(start: start, duration: avAsset.duration)
exportSession!.timeRange = range
exportSession!.exportAsynchronously(completionHandler: {() -> Void in
switch exportSession!.status {
case .failed:
print("%@",exportSession!.error ?? "Failed to get error")
case .cancelled:
print("Export canceled")
case .completed:
//Video conversion finished
let endDate = NSDate()
let time = endDate.timeIntervalSince(startDate as Date)
print(time)
print("Successful!")
print(exportSession!.outputURL)
default:
break
}
})
}
要调用该函数，可以使用
videoConvert(videoURL: fileUrl!)
或
self.videoConvert(videoURL: fileUrl!)
然后，您将转换视频并将其存储为名称为 VideoConvert.mp4
的文档目录。感谢 @Jigar Thakkar 答案。