AVAsset *asset = [AVAsset assetWithURL:[NSURL URLWithString:_videoUrl]];
? ? //? ? float startTime = 0;
? ? //? ? float endTime = CMTimeGetSeconds(asset.duration);
? ? ?NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
? ? formatter.dateFormat = @"yyyyMMddHHmmss";
? ? NSString *str = [formatter stringFromDate:[NSDate date]];
? ? NSString *audioPath = [NSTemporaryDirectory() stringByAppendingFormat:@"%@.mp3",str];
? ? CMTime start = CMTimeMakeWithSeconds(0, asset.duration.timescale);
? ? CMTime duration = asset.duration;
? ? CMTimeRange range = CMTimeRangeMake(start, duration);
? ? AVAssetExportSession *exportSession=[AVAssetExportSession exportSessionWithAsset:asset presetName:AVAssetExportPresetAppleM4A];
? ? exportSession.outputURL=[NSURL fileURLWithPath:audioPath];
? ? exportSession.outputFileType=AVFileTypeAppleM4A;
? ? exportSession.timeRange= range;
? ? [exportSession exportAsynchronouslyWithCompletionHandler:^{
? ? ? ? if (exportSession.status==AVAssetExportSessionStatusFailed) {
? ? ? ? ? ? NSLog(@"failed");
? ? ? ? }
? ? ? ? else {
? ? ? ? ? ? NSLog(@"AudioLocation : %@",audioPath);
? ? ? ? }
? ? }];
