在iPhone上切割video

我有一个来自设备相机的video文件 – 例如存储为/private/var/mobile/Media/DCIM/100APPLE/IMG_0203.MOV，我需要剪切此video的前10秒。 我可以使用哪些API或库？

Answer 1

我找到了标准API的解决方案： AVAssetExportSession

 - (void)getTrimmedVideoForFile:(NSString *)filePath withInfo:(NSArray *)info { //[[NSFileManager defaultManager] removeItemAtURL:outputURL error:nil]; AVURLAsset *asset = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:filePath] options:nil]; AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetLowQuality]; // NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSAllDomainsMask, YES); // NSString *outputURL = paths[0]; NSFileManager *manager = [NSFileManager defaultManager]; // [manager createDirectoryAtPath:outputURL withIntermediateDirectories:YES attributes:nil error:nil]; // outputURL = [outputURL stringByAppendingPathComponent:@"output.mp4"]; NSString *outputURL = [NSString stringWithFormat:@"/tmp/%@.mp4", [info objectAtIndex:2]]; NSLog(@"OUTPUT: %@", outputURL); // Remove Existing File // [manager removeItemAtPath:outputURL error:nil]; if (![manager fileExistsAtPath:outputURL]) { exportSession.outputURL = [NSURL fileURLWithPath:outputURL]; exportSession.shouldOptimizeForNetworkUse = YES; exportSession.outputFileType = AVFileTypeQuickTimeMovie; CMTime start = kCMTimeZero; CMTime duration = kCMTimeIndefinite; if ([[NSString stringWithFormat:@"%@", [info objectAtIndex:3]] floatValue] > 20.0) { start = CMTimeMakeWithSeconds(1.0, 600); duration = CMTimeMakeWithSeconds(10.0, 600); } CMTimeRange range = CMTimeRangeMake(start, duration); exportSession.timeRange = range; [exportSession exportAsynchronouslyWithCompletionHandler:^(void) { switch (exportSession.status) { case AVAssetExportSessionStatusCompleted: NSLog(@"Export Complete %d %@", exportSession.status, exportSession.error); [self sendVideoPreview:info]; break; case AVAssetExportSessionStatusFailed: NSLog(@"Failed:%@",exportSession.error); // [self addToDelayed:info withAction:@"add"]; break; case AVAssetExportSessionStatusCancelled: NSLog(@"Canceled:%@",exportSession.error); // [self addToDelayed:info withAction:@"add"]; break; default: break; } }]; } else { [self sendVideoPreview:info]; }