Convert AVPlayerItem to NSData - ios

Question

I am trying to achieve a simple task like converting a UIImage to NSData, for AVPlayerItem that is returned to me when I select a video from the PHImageManager. What might be an equivalent of the UIImagePNGRepresentation to convert video in data:
PHVideoRequestOptions *videoRequestOptions = [[PHVideoRequestOptions alloc] init];
videoRequestOptions.deliveryMode = PHVideoRequestOptionsDeliveryModeAutomatic;
videoRequestOptions.version = PHVideoRequestOptionsVersionOriginal;
[[PHImageManager defaultManager] requestPlayerItemForVideo:asset options:videoRequestOptions resultHandler:^(AVPlayerItem *item, NSDictionary *info)
{
//?
}];
Whereas the UIImage goes like this:
[[PHImageManager defaultManager] requestImageForAsset:asset targetSize:PHImageManagerMaximumSize contentMode:PHImageContentModeAspectFit options:imageRequestOptions resultHandler:^(UIImage *result, NSDictionary *info)
{
NSData *imageData = [NSData dataWithData:UIImagePNGRepresentation(result)]; //<==THIS
}

Answer 1

The solution is to get the URL from the AVPlayerItem asset, then create NSData from that URL:
PHAsset *asset = ...
PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
[[PHImageManager defaultManager] requestPlayerItemForVideo:asset options:options resultHandler:^(AVPlayerItem * _Nullable playerItem, NSDictionary * _Nullable info) {
NSURL *fileURL = [(AVURLAsset *)playerItem.asset URL];
NSData *videoData = [NSData dataWithContentsOfURL:fileURL];
NSLog(#"tmpData Size: %lu",tmpData.length);
}];
and another way is to use 'requestAVAssetForVideo:asset' ....
PHFetchOptions *fetchOption = [[PHFetchOptions alloc]init];
if ([fetchOption respondsToSelector:#selector(setFetchLimit:)]) {
[fetchOption setFetchLimit:1];
}
PHAsset *asset = [PHAsset fetchAssetsWithLocalIdentifiers:#[#"<Video-localIdentifier>"] options:fetchOption].firstObject;
PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc]init];
options.version = PHVideoRequestOptionsVersionOriginal;
options.deliveryMode = PHVideoRequestOptionsDeliveryModeAutomatic;
[[PHImageManager defaultManager] requestAVAssetForVideo:asset
options:options
resultHandler:
^(AVAsset *asset, AVAudioMix *audioMix, NSDictionary *info) {
AVURLAsset *urlAsset = (AVURLAsset *)asset;
NSData *videoData = [NSData dataWithContentsOfURL:urlAsset.URL];
if (videoData) {
NSLog(#"videoData Size: %lu", videoData.length);
}
}];