iOS视频裁剪_ios开发视频裁剪一部分-优快云博客

本文链接：https://blog.youkuaiyun.com/sinat_31177681/article/details/75050331

本文介绍了一种使用Objective-C在iOS设备上实现视频裁剪的方法。通过利用AVFoundation框架中的AVAssetExportSession类，可以将指定时间范围内的视频片段导出为新的文件。此过程包括设置输入资源、定义输出路径、配置导出会话参数及处理异步导出完成后的状态。

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直接上代码

- (void)cropWithVideoUrlStr:(NSURL *)videoUrl start:(CGFloat)startTime end:(CGFloat)endTime completion:(void (^)(NSURL *outputURL, Float64 videoDuration, BOOL isSuccess))completionHandle
{
AVURLAsset *asset =[[AVURLAsset alloc] initWithURL:videoUrl options:nil];

//获取视频总时长
Float64 duration = CMTimeGetSeconds(asset.duration);

NSString *outputFilePath = [self createVideoFilePath];
NSURL *outputFileUrl = [NSURL fileURLWithPath:outputFilePath];

NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:asset];
if ([compatiblePresets containsObject:AVAssetExportPresetMediumQuality])
{

AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]
initWithAsset:asset presetName:AVAssetExportPresetPassthrough];

NSURL *outputURL = outputFileUrl;

exportSession.outputURL = outputURL;
exportSession.outputFileType = AVFileTypeMPEG4;
exportSession.shouldOptimizeForNetworkUse = YES;

CMTime start = CMTimeMakeWithSeconds(startTime, asset.duration.timescale);
CMTime duration = CMTimeMakeWithSeconds(endTime - startTime,asset.duration.timescale);
CMTimeRange range = CMTimeRangeMake(start, duration);
exportSession.timeRange = range;

[exportSession exportAsynchronouslyWithCompletionHandler:^{
switch ([exportSession status]) {
case AVAssetExportSessionStatusFailed:
{
NSLog(@"合成失败：%@", [[exportSession error] description]);
completionHandle(outputURL, endTime, NO);
}
break;
case AVAssetExportSessionStatusCancelled:
{
completionHandle(outputURL, endTime, NO);
}
break;
case AVAssetExportSessionStatusCompleted:
{
completionHandle(outputURL, endTime, YES);
}
break;
default:
{
completionHandle(outputURL, endTime, NO);
} break;
}
}];
}
}