如何在 iPhone 应用程序中压缩录制的视频答案

【问题标题】：How to compress the recored video in iPhone app如何在 iPhone 应用程序中压缩录制的视频
【发布时间】：2013-10-08 05:51:22
【问题描述】：

我有一个 iPhone 应用程序，我正在其中录制视频并播放该视频它工作正常。但是文件大小是巨大的 3MB 30 秒任何想法或方法来压缩到这里我想要压缩按钮时的文件点击屏幕它应该压缩录制的视频。

  Saved Video 



    NSURL*videoURL = [info objectForKey:UIImagePickerControllerMediaURL];

    NSLog(@"found a video");

    videoData = [[NSData dataWithContentsOfURL:videoURL] retain];
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];

    NSDateFormatter *dateFormat = [[[NSDateFormatter alloc] init] autorelease];
    [dateFormat setDateFormat:@"dd-MM-yyyy_HH:mm:SS"];
    NSDate *now = [[[NSDate alloc] init] autorelease];
    NSDate* theDate = [dateFormat stringFromDate:now];


NSString*myDate=[dateFormat stringFromDate:theDate];
    NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"Default Album"];

    if (![[NSFileManager defaultManager] fileExistsAtPath:dataPath])
        [[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:nil];



NSString*test=@"test";


NSString*testUser=[test stringByReplacingOccurrencesOfString:@" " withString:@""];



videopath= [[[NSString alloc] initWithString:[NSString stringWithFormat:@"%@/%@.mp4",documentsDirectory,testUser]] autorelease];
    BOOL success = [videoData writeToFile:videopath atomically:NO];

    NSLog(@"Successs:::: %@", success ? @"YES" : @"NO");
    NSLog(@"video path --> %@",videopath);

NSURL *movieURL = [NSURL fileURLWithPath:videopath];
AVURLAsset *avUrl = [AVURLAsset assetWithURL:movieURL];
CMTime time1 = [avUrl duration];  
int seconds = ceil(time1.value/time1.timescale);

【问题讨论】：

标签： iphone ios video compression

【解决方案1】：

试试这个

+ (void)convertVideoToLowQualityWithInputURL:(NSURL*)inputURL outputURL:(NSURL*)outputURL successHandler:(void (^)())successHandler failureHandler:(void (^)(NSError *))failureHandler {
    if([[NSFileManager defaultManager] fileExistsAtURL:outputURL]) [[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil];
    AVURLAsset *asset = [AVURLAsset URLAssetWithURL:inputURL options:nil];
    AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetLowQuality];
    exportSession.outputURL = outputURL;
    exportSession.outputFileType = AVFileTypeQuickTimeMovie;
    [exportSession exportAsynchronouslyWithCompletionHandler:^(void) {
        if (exportSession.status == AVAssetExportSessionStatusCompleted) {
            successHandler();
        } else {
            NSError *error = [NSError errorWithDomain:domain code:code userInfo:userInfo]; 
            failureHandler(error); 
        }
     }];
}

【讨论】：