ios - requestExportSessionForVideo 空错误

Question

我正在使用 requestExportSessionForVideo 方法从 PHAsset 获取可发送视频，但我收到此警告，并且导出 session 记录了一个空值:

Null passed to a callee that requires a non-null argument

这是方法调用:

[manager requestExportSessionForVideo:asset options:videoOptions exportPreset:AVAssetExportSessionStatusUnknown resultHandler:^(AVAssetExportSession * _Nullable exportSession, NSDictionary * _Nullable info) {
            NSLog(@"Export session is: %@ ///// Info is %@", exportSession, info);
        }];

但是，打印的信息看起来不错:

Info is {
PHImageFileSandboxExtensionTokenKey = "8b504346993c71de48743d3c9c796385d7911ad2;00000000;00000000;000000000000001b;com.apple.avasset.read-only;00000001;01000002;00000000000468eb;/private/var/mobile/Media/DCIM/100APPLE/IMG_0004.MOV";
PHImageResultDeliveredImageFormatKey = 20000;
PHImageResultIsInCloudKey = 0;
PHImageResultWantedImageFormatKey = 20000;
}

如何从 PHAsset 中获取可以发送到云容器的视频对象？
这个警告会影响输出吗？
请注意，我的 Assets 是使用 GMImagePicker 选择的。

Answer 1

这可能会帮助您进一步进行。我目前面临同样的问题。但以下方法给了我视频网址。

PHVideoRequestOptions* options = [[PHVideoRequestOptions alloc] init];
    options.version = PHVideoRequestOptionsVersionOriginal;
    options.deliveryMode = PHVideoRequestOptionsDeliveryModeAutomatic;
    options.networkAccessAllowed = YES;
    options.progressHandler =  ^(double progress,NSError *error,BOOL* stop, NSDictionary* dict) {
        NSLog(@"progress %lf",progress);  //never gets called
    };


[[PHImageManager defaultManager] requestAVAssetForVideo:asset options:options resultHandler:^(AVAsset* avasset, AVAudioMix* audioMix, NSDictionary* info){
        NSLog(@"##Info:\n%@",info);
        AVURLAsset* myAsset = (AVURLAsset*)avasset;
        NSLog(@"##AVAsset URL: %@",myAsset.URL);
    }];

输出

2015-11-25 12:00:04.482 iLockBox[7602:2587808] ##Info:
{
    PHImageFileSandboxExtensionTokenKey = "7c2094f4c69015b87df6d7c86ec3217cc544e2e2;00000000;00000000;000000000000001b;com.apple.avasset.read-only;00000001;01000002;0000000000ff9a15;/private/var/mobile/Media/DCIM/111APPLE/IMG_1087.MOV";
    PHImageResultDeliveredImageFormatKey = 20000;
    PHImageResultIsInCloudKey = 0;
    PHImageResultWantedImageFormatKey = 20000;
}
2015-11-25 12:00:16.007 iLockBox[7602:2587808] ##AVAsset URL: file:///var/mobile/Media/DCIM/111APPLE/IMG_1087.MOV

请评论您的结果。