Develop Reference

How to extract Thumbnail of MP4 Video located in azure storage

I want to extract a thumbnail from an mp4 video hosted in azure storage. My current method in C# uses a NReco NuGet package:
But that is a local file. How do i extract the thumb from an azure storage file.
string mp4inputpath = server.mappath("~/testfolder/myvideo.mp4");
string thumbOutputPath = server.mappath("~/testfolder/mythumb.jpg");
var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
// Get the thumb at the frame 1 second into the video
ffMpeg.GetVideoThumbnail(mp4inputpath, thumbOutputPath, 1);
That works! But i need to use an azure storage file url for mp4inputpath.
I can download the mp4 file from azure storage and save it temporarily into my azure web app. I can do that programatically.
Then extract the thumb, ie,
ffMpeg.GetVideoThumbnail(mp4inputpath, thumbOutputPath, 1);
Then delete the temporary mp4 within my app.
this works but i don't know it is advisable to download mp4 files into my azure web app. I don't know if it will scale. This is the only solution i have, so far.
string mp4Url = #"https://mysorageaccount.blob.core.windows.net/mp4/vacation/summer/dogbarking.mp4";
string thumbOutputPath = server.mappath("~/testfolder/mythumb.jpg");
var ffMpeg = new NReco.VideoConverter.FFMpegConverter();
// Get the thumb at the frame 1 second into the video
ffMpeg.GetVideoThumbnail(mp4Url, thumbOutputPath, 1);
This does not seem to work. No Error, but the thumbOutputPath file is empty.

What you've done is pretty much what you have to do, since you cannot open an object in Azure Storage as you would a local file. So, grabbing the file into a local file or a stream is what you'd need to do.
As far as scaling: that will depend on the size (and number of instances) you're running in your Web App. Just be aware that you should have both your storage account and your Web App in the same region, to reduce latency and avoid egress charges for bandwidth.

What is the equivalent of an HTML audio blob in C#

I'm building a Windows Universal App, and I'm looking for the equivalent of this code in C#
var media = new Blob([bytes], { type: "audio/mpeg" });
var url = window.URL.createObjectURL(media, { oneTimeOnly: true });
Basically, I have streams that I download, and want to play in the background; however, they need to be "saved" as an audio file locally, and I'm not sure how to do that in C#.

The Object type “Blob” and function “createObjectURL” are both new HTML5 features. It is supported by the host (browser) and different browsers may have the different implementations, so it is very difficult to do the same thing in C#.
To save an audio file locally, you can use the StorageFile class in Windows Runtime.

Upload a text file with Azure Mobile Services

I want to create an application where the user after authentication can upload a file(txt/xml etc.) using the Azure Mobile Services and after that he can download only those files which were uploaded by himself.
I've watched a lot of tutorials (including this one: link ) but in this case they simply inserts a row to a database table. I want basically the same thing, just with files. How can I do that?
I'm really new to this, so I'm just guessing, but should I upload the files to Blob Storage, and store a link in the database pointing to that file? I'm searching for the best practice.

Yes, you are correct!
You would be limited in size if you tried to store the text file as a field in the database.
http://azure.microsoft.com/en-us/documentation/articles/mobile-services-windows-store-dotnet-upload-data-blob-storage/
Shows how to do what you want to do but with images.
You would want to change the image stream to a text stream here:
// Get the new image as a stream.
using (var fileStream = await media.OpenStreamForReadAsync())
{
...
}
And use the Stream classes instead to open the file stream:
http://msdn.microsoft.com/en-us/library/windows/apps/system.io.stream(v=vs.105).aspx

windows phone 7 Download files and save it in phone storage

am developing an application which can fetch files from internet.. how do i download and save a "docx" or "wav" file from internet within the application and use it later with other application likes office or windows media player.

You can download files in the background (ie. they will continue even when your application is not running).
Having said that, you should research the types of files you need to support. For example, you can play an audio file (if the format is supported) or add it to Music hub but you cannot open a file in Office. Very few filetypes can be integrated with, so do some research before you start writing your app otherwise you might be disappointed.

place an image control in your page. here im1 is controls name.
it is working for me
string imgurl="http://.........";(path)
Uri addrs=new Uri(imgurl,UriKind.Absolute);
BitmapImage bitmap = new BitmapImage(addrs);
im1.Source = bitmap;

Play audio url on windows mobile

I'm going to write a function to play a mp3 file from an URL on Windows Mobile 6.0 without downloading all the stream to mobile. I read some documentation and faced some problem that.
Using NAudio.dll
: The dll is not compatible for Windows Mobile
Using DirectShowLib.dll : have not found way to get from audio stream.
Is it true that we can't get an audio Url Stream in Windows Mobile 6.0? Is there any way or any dll else to help me?

Which windows mobile? 6.5 or 7?
7 uses Silverlight so it should be really easy to do smooth streaming (never tried it).
6+ I'm not so sure, maybe use a WCF filestream to get the stream?

I find out Bass library work well on my specific issue - play mp3 audio from url on windows mobile 6.
Add bass_cp.dll to your solution. And make sure to copy the bass.dll to your execute directory.
And what you need to do is very simple:
int stream = Bass.BASS_StreamCreateURL(strUrl, 0, 0, null, IntPtr.Zero);
Bass.BASS_Init(-1, 44100, BASSInit.BASS_DEVICE_DEFAULT, IntPtr.Zero);
Bass.BASS_ChannelPlay(stream, false);
Of course after you register for the dll. Then add this code line at first:
BassNet.Registration(string email, activated key);