public VideoManager(IVideoDal videoDal, IChannelService channelService, IUserService userService, IFileSystem fileSystem)
{
_videoDal = videoDal;
_channelService = channelService;
_userService = userService;
_fileSystem = fileSystem;
}
public VideoManager(IVideoDal videoDal)
{
_videoDal = videoDal;
}