video thumbnail image not generated from local video URL(asset URL) iOS

Question

i am using AVAssetImageGenerator for generating the thumbnail images for video. when i pass local video asset url to generate image it is retuning nil.i am using below code to generate image.

 NSURL *url = [NSURL fileURLWithPath:filepath];

AVAsset *asset = [AVAsset assetWithURL:url];
AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
CMTime time =CMTimeMake(1, 1);

CGImageRef imageRef = [imageGenerator copyCGImageAtTime:time actualTime:NULL error:NULL];
UIImage *thumbnail = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef);

Answer 1

use below code

AVAsset *asset = [AVAsset assetWithURL:url];
    //  Get thumbnail at the very start of the video
    CMTime thumbnailTime = [asset duration];
    thumbnailTime.value = 0;

    //  Get image from the video at the given time
    AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc] initWithAsset:asset];

    CGImageRef imageRef = [imageGenerator copyCGImageAtTime:thumbnailTime actualTime:NULL error:NULL];

    UIImage *thumbnail = [UIImage imageWithCGImage:imageRef];
    CGImageRelease(imageRef);