根据时间进行视频的裁剪

超、凢脫俗 2022-03-16 07:54 262阅读 0赞

一个视频自由设置时间，并裁剪成更短时间的视频。

示例代码如下：

+ (void)videoClippingWithFilePath:(NSString *)filePath start:(CGFloat)startTime end:(CGFloat)endTime complete:(void (^)(BOOL isSuccess, NSString *videoPath, Float64 videoDuration))complete
    {
        if (filePath == nil || filePath.length <= 0) {
            if (complete) {
                complete(NO, nil, 0.0);
            }
        } else {
            NSURL *url = [NSURL fileURLWithPath:filePath];
            AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:url options:nil];
            
            // 裁剪保存路径
            NSString *fileName = filePath.lastPathComponent;
            NSString *fileType = fileName.pathExtension;
            NSString *outputFileName = [NSString stringWithFormat:@"output.%@", fileType];
            NSString *outputFilePath = [[filePath stringByReplacingOccurrencesOfString:fileName withString:@""] stringByAppendingPathComponent:outputFileName];
            NSLog(@"fileName = %@, fileType = %@, outputFilePath = %@", fileName, fileType, outputFilePath);
            NSURL *outputFileUrl = [NSURL fileURLWithPath:outputFilePath];
        
            //
            AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetPassthrough];
            exportSession.outputURL = outputFileUrl;
            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(@"裁剪失败：%@", [[exportSession error] description]);
                        if (complete) {
                            complete(NO, outputFilePath, endTime);
                        }
                    } break;
                    case AVAssetExportSessionStatusCancelled: {
                        if (complete) {
                            complete(NO, outputFilePath, endTime);
                        }
                    } break;
                    case AVAssetExportSessionStatusCompleted: {
                        if (complete) {
                            complete(YES, outputFilePath, endTime);
                        }
                    } break;
                    default: {
                        if (complete) {
                            complete(NO, outputFilePath, endTime);
                        }
                    } break;
                }
            }];
        }
    }

> 需要导入头文件 ‘\#import <AVFoundation/AVFoundation.h>’