目前,我正在开发处理视频的应用程序。
在我的应用程序中,用户可以修剪视频,我有一个自定义控件,用于选择开始时间和结束时间。我需要通过这两个值修剪视频。我尝试使用UIVideoEditorController
,如下所示。
UIVideoEditorController* videoEditor = [[[UIVideoEditorController alloc] init] autorelease];
videoEditor.delegate = self;
NSString* videoPath = [[NSBundle mainBundle] pathForResource:@"test" ofType:@"MOV"];
if ( [UIVideoEditorController canEditVideoAtPath:videoPath] )
{
videoEditor.videoPath = videoPath;
[self presentModalViewController:videoEditor animated:YES];
}
else
{
NSLog( @"can't edit video at %@", videoPath );
}
但问题是上面的代码会显示苹果的视频编辑器控件,用户可以对该视图进行一些操作。我不想显示此视图,因为我已在MPMoviePlayer
上显示视频并收到用户输入(开始时间和结束时间 )用于修剪自定义控件上的视频。
如何裁剪视频而不显示UIVideoEditorController
?
答案 0 :(得分:17)
最后我找到了解决方案。
我们可以使用AVAssetExportSession
修剪视频而不显示UIVideoEditorController
。
我的代码就像:
- (void)splitVideo:(NSString *)outputURL
{
@try
{
NSString *videoBundleURL = [[NSBundle mainBundle] pathForResource:@"Video_Album" ofType:@"mp4"];
AVAsset *asset = [[AVURLAsset alloc] initWithURL:[NSURL fileURLWithPath:videoBundleURL] options:nil];
NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:asset];
if ([compatiblePresets containsObject:AVAssetExportPresetLowQuality])
{
[self trimVideo:outputURL assetObject:asset];
}
videoBundleURL = nil;
[asset release];
asset = nil;
compatiblePresets = nil;
}
@catch (NSException * e)
{
NSLog(@"Exception Name:%@ Reason:%@",[e name],[e reason]);
}
}
此方法修剪视频
- (void)trimVideo:(NSString *)outputURL assetObject:(AVAsset *)asset
{
@try
{
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]initWithAsset:asset presetName:AVAssetExportPresetLowQuality];
exportSession.outputURL = [NSURL fileURLWithPath:outputURL];
exportSession.outputFileType = AVFileTypeQuickTimeMovie;
CMTime start = CMTimeMakeWithSeconds(splitedDetails.startTime, 1);
CMTime duration = CMTimeMakeWithSeconds((splitedDetails.stopTime - splitedDetails.startTime), 1);
CMTimeRange range = CMTimeRangeMake(start, duration);
exportSession.timeRange = range;
exportSession.outputFileType = AVFileTypeQuickTimeMovie;
[self checkExportSessionStatus:exportSession];
[exportSession release];
exportSession = nil;
}
@catch (NSException * e)
{
NSLog(@"Exception Name:%@ Reason:%@",[e name],[e reason]);
}
}
此方法检查修剪的状态:
- (void)checkExportSessionStatus:(AVAssetExportSession *)exportSession
{
[exportSession exportAsynchronouslyWithCompletionHandler:^(void)
{
switch ([exportSession status])
{
case AVAssetExportSessionStatusCompleted:
NSLog(@"Export Completed");
break;
case AVAssetExportSessionStatusFailed:
NSLog(@"Error in exporting");
break;
default:
break;
}
}];
}
我从导出按钮操作方法调用splitVideo
方法,并将输出网址作为参数传递。
答案 1 :(得分:2)
我们可以导入AVFoundation / AVFoundation.h
-(BOOL)trimVideofile
{
float videoStartTime;//define start time of video
float videoEndTime;//define end time of video
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd_HH-mm-ss"];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
NSString *libraryCachesDirectory = [paths objectAtIndex:0];
libraryCachesDirectory = [libraryCachesDirectory stringByAppendingPathComponent:@"Caches"];
NSString *OutputFilePath = [libraryCachesDirectory stringByAppendingFormat:@"/output_%@.mov", [dateFormatter stringFromDate:[NSDate date]]];
NSURL *videoFileOutput = [NSURL fileURLWithPath:OutputFilePath];
NSURL *videoFileInput;//<Path of orignal Video file>
if (!videoFileInput || !videoFileOutput)
{
return NO;
}
[[NSFileManager defaultManager] removeItemAtURL:videoFileOutput error:NULL];
AVAsset *asset = [AVAsset assetWithURL:videoFileInput];
AVAssetExportSession *exportSession = [AVAssetExportSession exportSessionWithAsset:asset
presetName:AVAssetExportPresetLowQuality];
if (exportSession == nil)
{
return NO;
}
CMTime startTime = CMTimeMake((int)(floor(videoStartTime * 100)), 100);
CMTime stopTime = CMTimeMake((int)(ceil(videoEndTime * 100)), 100);
CMTimeRange exportTimeRange = CMTimeRangeFromTimeToTime(startTime, stopTime);
exportSession.outputURL = videoFileOutput;
exportSession.timeRange = exportTimeRange;
exportSession.outputFileType = AVFileTypeQuickTimeMovie;
[exportSession exportAsynchronouslyWithCompletionHandler:^
{
if (AVAssetExportSessionStatusCompleted == exportSession.status)
{
NSLog(@"Export OK");
}
else if (AVAssetExportSessionStatusFailed == exportSession.status)
{
NSLog(@"Export failed: %@", [[exportSession error] localizedDescription]);
}
}];
return YES;
}