通過AVAsset 獲取視頻的寬高時,遇到了一個問題,獲取出來的寬高都是一樣的,比如豎屏視頻 1000 * 2000,橫屏2000 * 1000,但是獲取出來都是2000*1000,無法區分橫豎屏,快速的記錄一下
搜索了大部解決方法:
AVAsset *asset = [AVAsset assetWithURL:url];
NSArray *tracks = [asset tracksWithMediaType:AVMediaTypeVideo];
if([tracks count] > 0) {
AVAssetTrack *videoTrack = [tracks objectAtIndex:0];
CGAffineTransform t = videoTrack.preferredTransform;//這裏的矩陣有旋轉角度,轉換一下即可
NSLog(@"=====hello width:%f===height:%f",videoTrack.naturalSize.width,videoTrack.naturalSize.height);//寬高
上述方法不正確,或取出來還是寬高都一樣,或者是顛倒,下面一個方法比較靠譜
NSArray *array = self.avAsset.tracks;
//獲取視頻大小...不用之前的naturalSize 方法是因爲被棄用了
CGSize videoSize = CGSizeZero;
for (AVAssetTrack *track in array) {
if ([track.mediaType isEqualToString:AVMediaTypeVideo]) {
CGSize realSize = CGSizeApplyAffineTransform(track.naturalSize, track.preferredTransform);
// break;
videoSize = CGSizeMake(fabs(realSize.width), fabs(realSize.height));
}
}
NSLog(@"width = %f,height = %f",self.videoSize.width,self.videoSize.height);
用這種方法,獲取出來的就是正確的