Saving video to azure, unable to load video some times

Hello all I am having the following code to save video to azure, which is working fine. But when I am loading the videos and trying to play them I am unable to play some of them. I am calling this using a service to execute for every 2 seconds to record the video from the angular service

public async Task<int> Save(System.IO.Stream stream, string name)
{
MemoryStream memStream = new MemoryStream();
stream.CopyTo(memStream);
memStream.Position = 0;
// Parse the connection string and return a reference to the storage account.
CloudStorageAccount storageAccount = CloudStorageAccount.Parse(AzureConfig.CONNECTION_STRING);
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
ServiceProperties serviceProperties = await blobClient.GetServicePropertiesAsync();
// Set the default service version to be used for anonymous requests.
serviceProperties.DefaultServiceVersion = "2016-05-31";
// Set the service properties.
await blobClient.SetServicePropertiesAsync(serviceProperties);
// Retrieve a reference to a container.
CloudBlobContainer container = blobClient.GetContainerReference("video");
// Retrieve reference to a blob named "myblob".
CloudAppendBlob appBlob = container.GetAppendBlobReference(name + ".webm");
if (!await appBlob.ExistsAsync())
{
await appBlob.CreateOrReplaceAsync();
}
appBlob.Properties.ContentType = "video/webm;codecs=vp9";
await appBlob.SetPropertiesAsync();
appBlob.Metadata.Add(new KeyValuePair<string, string>("uploadedDate", DateTime.Now.ToString()));
await appBlob.AppendFromStreamAsync(memStream);
return 0;
}

The video is getting uploaded but when I am trying to view the video some times the video is not getting displayed. I am using similar kind of this where for every 2 seconds I am calling a service to save the video in to azure

https://www.webrtc-experiment.com/RecordRTC/