private byte[] getVideoThumbnail(FileAsset file) { var thumb_path = Path.Combine(MyFileFolder.Thumbs, file.file_id.ToString() + ".thumb.mp4"); if (File.Exists(thumb_path)) { File.Delete(thumb_path); } var file_path = Path.Combine(MyFileFolder.Photo, file.saved_path); var videoWidth = getVideoWidth(file_path); if (videoWidth <= 0) { return(null); } if (videoWidth > 720) { FFmpegHelper.MakeVideoThumbnail720(file_path, thumb_path); } else { FFmpegHelper.MakeVideoThumbnail(file_path, thumb_path); } return(File.ReadAllBytes(thumb_path)); }