deserialization from Azure

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C#

I keep getting this error when I try to deserialize object. Code is below. The error occurs on the deserlalizefromstream() method below:

An exception of type 'System.Runtime.Serialization.SerializationException' occurred in mscorlib.dll but was not handled in user code

Additional information: The input stream is not a valid binary format. The starting contents (in bytes) are: FF-D8-FF-E1-00-18-45-78-69-66-00-00-49-49-2A-00-08 ...

public class Functions
   {
       // This function will get triggered/executed when a new message is written
       // on an Azure Queue called queue.
       //public static void ProcessQueueMessage([QueueTrigger("queue")] string message, TextWriter log)
       //{
       //    log.WriteLine(message);
       //}
       public static void ProcessRawFile(
       [QueueTrigger("thumbnailrequest")] BlobInformation blobInfo,
       [Blob("images/{BlobName}", FileAccess.Read)] Stream input,
       [Blob("images/{BlobNameWithoutExtension}_thumbnail.jpg")] CloudBlockBlob outputBlob)
       {
           using (Stream output = outputBlob.OpenWrite())
           {
               //do work
               // Retrieve storage account from connection string.
               var storageAccount = CloudStorageAccount.Parse(ConfigurationManager.ConnectionStrings["AzureWebJobsStorage"].ToString());

               // Create the blob client.
               CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();

               // Retrieve a reference to a container.
               CloudBlobContainer container = blobClient.GetContainerReference("images");

               // Retrieve reference to a blob named "myblob".
               CloudBlockBlob blob = container.GetBlockBlobReference("TestImage");


               MemoryStream ms = new MemoryStream();
               //Retrive the memorystream
               blob.DownloadToStream(ms);

               var rawFile = DeserializeFromStream(ms);
           }
       }
       private static MemoryStream SerializeToStream(object o)
       {
           MemoryStream stream = new MemoryStream();
           IFormatter formatter = new BinaryFormatter();
           formatter.Serialize(stream, o);
           return stream;
       }

       private static object DeserializeFromStream(MemoryStream stream)
       {

           IFormatter formatter = new BinaryFormatter();
           stream.Seek(0, SeekOrigin.Begin);
           object o = formatter.Deserialize(stream);
           return o;
       }