坑点1：选择完视频后 setDidFinishPickingVideoHandle block回调拿取到了PHAsset *phasset对象,
如何将PHAsset将转成NSURL呢?实际上我们在使用TZImagePickerController选择视频时，TZImagePickerController提供视频预览功能，由此可以推断出这个TZImagePickerController应该是实现了获取资源路径的方法，于是找了下TZVideoPlayerController就是预览播放器，里面有个方法[TZImageManager manager] getVideoWithAsset...
以下是最后获取到NSURL的代码：(demo看情况 有空再上传吧)
要导入的头文件
#import <TZImagePickerController.h>
#import <TZImageManager.h>
选择完视频后的回调
[tzImagePickerController setDidFinishPickingVideoHandle:^(UIImage *coverImage, PHAsset *phasset) {
[[TZImageManager manager] getVideoWithAsset:phasset completion:^(AVPlayerItem *playerItem, NSDictionary *info) {
AVAsset *avasset = playerItem.asset;
NSURL *fileUrl = [LZBRecordVideoTool _convert2Mp4:nil asset:avasset];//AVAsset转MP4并返回NSURL的实现
dispatch_async(dispatch_get_main_queue(), ^{
//主线程中进行UI操作
});
}];
AVAsset转MP4并返回NSURL的实现
/*! @method @brief mov格式视频转换为MP4格式 @discussion @param movUrl mov视频路径 @result MP4格式视频路径 */
+ (NSURL *)_convert2Mp4:(NSURL *)movUrl asset:(AVAsset *)asset;
{
AVAsset *avAsset = asset;
NSURL *mp4Url = nil;
if (asset){
}else{
avAsset = [AVURLAsset URLAssetWithURL:movUrl options:nil];
}
NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:avAsset];
if ([compatiblePresets containsObject:AVAssetExportPresetHighestQuality]) {
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]initWithAsset:avAsset presetName:AVAssetExportPresetHighestQuality];
NSString *mp4Path = [NSString stringWithFormat:@"%@/%d%d.mp4", [EMCDDeviceManager dataPath], (int)[[NSDate date] timeIntervalSince1970], arc4random() % 100000];
mp4Url = [NSURL fileURLWithPath:mp4Path];
exportSession.outputURL = mp4Url;
exportSession.shouldOptimizeForNetworkUse = YES;
exportSession.outputFileType = AVFileTypeMPEG4;
dispatch_semaphore_t wait = dispatch_semaphore_create(0l);
[exportSession exportAsynchronouslyWithCompletionHandler:^{
switch ([exportSession status]) {
case AVAssetExportSessionStatusFailed: {
NSLog(@"failed, error:%@.", exportSession.error);
} break;
case AVAssetExportSessionStatusCancelled: {
NSLog(@"cancelled.");
} break;
case AVAssetExportSessionStatusCompleted: {
NSLog(@"completed.");
} break;
default: {
NSLog(@"others.");
} break;
}
dispatch_semaphore_signal(wait);
}];
long timeout = dispatch_semaphore_wait(wait, DISPATCH_TIME_FOREVER);
if (timeout) {
NSLog(@"timeout.");
}
if (wait) {
//dispatch_release(wait);
wait = nil;
}
}
return mp4Url;
}
