Question

我正在使用UIImagePickerController捕获视频。将视频导出到mp4。代码在这里：

- (NSString *)convertMOVToMp4:(NSURL *)url : (NSString *)filename
   {
       NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
      NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory

      NSString *dataPath = [documentsPath stringByAppendingPathComponent:@"/doctorphoto"];
      NSError *error = nil;
      if (![[NSFileManager defaultManager] fileExistsAtPath:dataPath])
        [[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:&error];

      NSString *videoPath1 = [dataPath stringByAppendingPathComponent:@"xyz2.mov"]; //Add the file name
      NSString *movfilepath = videoPath1;
      NSURL *videoURL = url;
      NSData *videoData = [NSData dataWithContentsOfURL:videoURL];
      [videoData writeToFile:videoPath1 atomically:NO];

      AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:movfilepath] options:nil];
      NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:avAsset];

      if ([compatiblePresets containsObject:AVAssetExportPresetLowQuality])
       {
         AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]initWithAsset:avAsset presetName:AVAssetExportPresetPassthrough];
         videoPath1 = [self getLocalVideoPath:filename];
         exportSession.outputURL = [NSURL fileURLWithPath:videoPath1];
         NSLog(@"videopath of your mp4 file = %@",videoPath1);  // PATH OF YOUR .mp4 FILE
         exportSession.outputFileType = AVFileTypeMPEG4;

        [exportSession exportAsynchronouslyWithCompletionHandler:^{
            switch ([exportSession status]) {

                case AVAssetExportSessionStatusFailed:
                    NSLog(@"Export failed: %@", [[exportSession error] localizedDescription]);
                    break;

                case AVAssetExportSessionStatusCancelled:
                    NSLog(@"Export canceled");
                    break;
                default:
                    NSLog(@"Export success.");
                    [self.delegate onCompleteConvert: videoPath1 : anyobj];
                    break;
                }
                NSFileManager *fileManager = [NSFileManager defaultManager];
                [fileManager removeItemAtPath:movfilepath error:NULL];
            }];
        }

        return videoPath1;
    }

它转换成mp4。然后上传到AWS服务器。此链接正在流入iPhone 8，但不能在iPhone 5S，iPad mini2中播放。在网站上，音频正在播放，但显示黑屏。如果我按照iPhone 5S或iPad mini的相同程序，它的工作正常。有谁能够帮我。提前谢谢。

Answer 1

这一改变解决了这个问题：

- (NSString *)convertMOVToMp4:(NSURL *)url : (NSString *)filename
{
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory

    NSString *dataPath = [documentsPath stringByAppendingPathComponent:@"/doctorphoto"];
    NSError *error = nil;
    if (![[NSFileManager defaultManager] fileExistsAtPath:dataPath])
        [[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:&error];

    NSString *videoPath1 = [dataPath stringByAppendingPathComponent:@"xyz2.mov"]; //Add the file name
    NSString *movfilepath = videoPath1;
    NSURL *videoURL = url;
    NSData *videoData = [NSData dataWithContentsOfURL:videoURL];
    [videoData writeToFile:videoPath1 atomically:NO];

    AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:movfilepath] options:nil];
    NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:avAsset];

    if ([compatiblePresets containsObject:AVAssetExportPresetLowQuality])
    {
        NSString *preset = AVAssetExportPreset1920x1080;

        AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]initWithAsset:avAsset presetName:preset];
        videoPath1 = [self getLocalVideoPath:filename];
//        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//        videoPath1 = [NSString stringWithFormat:@"%@/doctorphoto/%@", [paths objectAtIndex:0], filename];
        exportSession.outputURL = [NSURL fileURLWithPath:videoPath1];
        NSLog(@"videopath of your mp4 file = %@",videoPath1);  // PATH OF YOUR .mp4 FILE
        exportSession.outputFileType = AVFileTypeMPEG4;
        exportSession.shouldOptimizeForNetworkUse = true;
        [exportSession exportAsynchronouslyWithCompletionHandler:^{
            switch ([exportSession status]) {

                case AVAssetExportSessionStatusFailed:
                    NSLog(@"Export failed: %@", [[exportSession error] localizedDescription]);
                    break;

                case AVAssetExportSessionStatusCancelled:
                    NSLog(@"Export canceled");
                    break;
                default:
                    NSLog(@"Export success.");
                    [self.delegate onCompleteConvert: videoPath1 : anyobj];
                    break;
            }
//            UISaveVideoAtPathToSavedPhotosAlbum(videoPath1, self, nil, nil);
            NSFileManager *fileManager = [NSFileManager defaultManager];
            [fileManager removeItemAtPath:movfilepath error:NULL];
        }];
    }

    return videoPath1;
}

从iPhone 8录制的mp4视频没有播放iPad mini 2＆amp;网站

1 个答案: