ios获取视频某一帧

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- (UIImage*) getVideoPreViewImage
{AVURLAsset *asset &＃61; [[AVURLAsset alloc] initWithURL:videoPath options:nil];AVAssetImageGenerator *gen &＃61; [[AVAssetImageGenerator alloc] initWithAsset:asset];[asset release];gen.appliesPreferredTrackTransform &＃61; YES;CMTime time &＃61; CMTimeMakeWithSeconds(0.0, 600);NSError *error &＃61; nil;CMTime actualTime;CGImageRef image &＃61; [gen copyCGImageAtTime:time actualTime:&actualTime error:&error];UIImage *img &＃61; [[[UIImage alloc] initWithCGImage:image] autorelease];CGImageRelease(image);[gen release];return img;
}


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CMTime time &＃61; CMTimeMakeWithSeconds(0.0, 600);


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Float64 seconds &＃61; 5;
int32_t preferredTimeScale &＃61; 600;
CMTime inTime &＃61; CMTimeMakeWithSeconds(seconds, preferredTimeScale);
CMTimeShow(inTime);


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int64_t value &＃61; 10000;
int32_t preferredTimeScale &＃61; 600;
CMTime inTime &＃61; CMTimeMake(value, preferredTimeScale);
CMTimeShow(inTime);


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CGImageRef image &＃61; [gen copyCGImageAtTime:timeactualTime:&actualTimeerror:&error];


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CMTimeShow(actualTime)


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float fps &＃61; [[[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] nominalFrameRate];


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gen.requestedTimeToleranceAfter &＃61; kCMTimeZero;gen.requestedTimeToleranceBefore &＃61; kCMTimeZero;