getFrameAtTime: videoFrame is a NULL Pointer

I'm using in forms with

```
var mediaItem = await CrossMediaManager.Current.Extractor.CreateMediaItem(inURL);
var image = await CrossMediaManager.Current.Extractor.GetVideoFrame(mediaItem, TimeSpan.FromSeconds(0));

```
and getting in the Device log
```
Time Device Name Type PID Tag Message
02-09 17:17:45.848 pixel_5_-_api_30 Error 4044 MediaMetadataRetrieverJNI getFrameAtTime: videoFrame is a NULL pointer
02-09 17:17:45.848 pixel_5_-_api_30 Error 437 MetadataRetrieverClient failed to capture a video frame

```
and image comes back null. Some videos work and I get an image, and some I get this null. IN all cases the videos actually play, it just doesn't get a frame. I've tried different timespans, and not sure what else to do.

Any help appreciated! Thanks for this tool!

Start by reproducing the issue through Extractor.CreateMediaItem and Extractor.GetVideoFrame on the Android Pixel 5/API 30 setup described. Compare videos that return a frame with those that produce the MediaMetadataRetrieverJNI and MetadataRetrieverClient errors. Done means the affected videos return a usable frame, or the limitation and supported inputs are documented.

Written by the indexing model from the issue text.