I would like to know if there's any library (like zbar for android) for reading QR-Codes in windows store apps? I already know ZXing.Net, but that only decodes from an image, I would like to decode it directly from the camera.
Thanks for your help :)
Edit: Is there a source code for a demo application? That would be even better since I'm a beginner with windows store apps.
Check out Optical Reader Library of Nokia: http://developer.nokia.com/community/wiki/Optical_Reader_Library_for_Windows_Phone_8
And if it doesn't solve your problem, or you simply don't like it, it is relatively easy to make your own one using ZXing.NET and camera reader task.
Related
I am currently working on a solution where i want to livestream from my app. I succesfully get my camerastream working with avfoundation. The next step in order to complete my task is to send my video frames to a rtmp server but I am not sure on how i can accomplish this in xamarin forms ios.
For swift there is a library called https://github.com/jgh-/VideoCore that solves this but do we have something similiar in xamarin (any library) or documentation on examples that tackles this issue?
Thanks a lot!
Maybe it's a bit late for you, but this can probably help someone who wants to do the same thing (like I did), you can use the Xamarin port of LFLiveKit:
https://github.com/rhedgpeth/Xamarin-LFLiveKit
You'll have to implement a custom renderer to use it with forms, but it's not too hard if you follow the sample project in the repository.
I want to trim a MP4 video in a Windows Phone 8 Application.
Say when saving a video, I only want to save the last two minutes.
I have tried converting the video stream into a byte array and altering it. Since the mp4 format has headers and lot of other metadata it is not easy to achieve this fiddling with the byte array of the stream.
If it is a Windows Store app I can use MediaTranscode class in the Windows.Media.Transcoding API to achieve this like in the article below.
Trim Video Windows Store App Example
I pretty much want to do something similar in windows phone.
Is there a similar API I can use in WP?
I also have been looking into Microsoft Media Foundation to achieve this? I am no C++ expert and wanting achieve this in C#.
Any help or direction would be much appreciated.
Thanks
C# in general is not setup to do movie editing. It's older sibling c++ is where this done. I know that's not the answer you want to hear but sometimes that's the only reality there is. I was going to offer a hack to make it happen but after digging through the MSDN libraries I don't even see a worthy hack for this.
Find a C++ example and work from there. It will be a little headache but you are much better off than attempting to make C# bend beyond its elasticity point.
Here is a similar thread expressing your concerns.
http://forums.wpcentral.com/windows-phone-apps/204490-video-editing-apps.html
They have made the point that there isn't a single video editing tool on the entire market.
With how long the market has been around I would assume this is because it's not a capability in C#. Which happens to be 99% of the developers working on windows phone right now.
I need to do some image processing in a Windows 8 metro application. I have written some functions in MATLAB for that. Is there a way I can integrate them in my application? I am kinda lost here. Can anyone suggest something about this? I would be grateful.
P.S: In my MATLAB program I am detecting face shape and skin tone.
Sure, why not? Just re-implement your Matlab code in C# or C++. Do you have a specific question?
You can use computer vision libraries like OpenCV (or the EmguCV C# wrapper) or AForge.NET.
Here is lightweight image processing sample. I think it's better to check this sample, it might be helpful to you. Please note the article is bit older so it must be updated by author.
I'm trying to apply an effect on a mediacapture stream for a WPF app I'm porting over to Metro. In the WPF app I used Pixel shaders to modify a bitmap whose source was set to the stream of a webcam, but since effects have been dropped for Metro I'm looking for an alternative solution.
The best, and most Metro standards compliant, way of doing this that I've found is building my own MFTs and adding them to my MediaCapture element via the addEffectAsync() method. I've downloaded the MFTGrayscale and MediaExtension examples which show how to apply these effects to a MediaCapture element, but I'm having an issue understanding the actual C++ MFT code. Can someone point me to or give a decent walkthrough/explanation of how I'd go about building my own MFT effect from the ground up? I don't know too much C/C++, just enough to understand some of the example code. I'm really having trouble with the conceptual and architectural aspects of MFT, and hence am very confused by the source code.
Your help is very much appreciated.
EDIT:
Another option I'd consider is using SharpDX. However I'm having issues getting a stream of the MediaCapture object to display on a xaml image element. Any help would be appreciated. Thanks.
You should absolutely have a look at the following git repo: https://github.com/mmaitre314/VideoEffect
It shows how to apply image effects from the Lumia Imaging SDK, Win2D, and DirectX HLSL pixel shaders to videos in Universal Store Apps for Windows Phone 8.1 and Windows 8.1.
Effects can be applied via MediaTranscoder, MediaComposition, MediaCapture, or MediaElement. And the binaries are available via NuGet.
I ended up getting answer on the MSDN forums. It's not an ideal answer, but it's what I'd been fearing all along.
http://social.msdn.microsoft.com/Forums/en-US/winappswithcsharp/thread/f3a6934e-df7a-44da-bfd8-7b95d494ff43/#90690f89-e57d-4043-9881-60fcc587f736
This is totally doable... I've just rewritten one of the MF transforms from the samples to use the Nokia Imaging SDK and apply filters in real-time to webcam video. You can see how I did it at the link below (plus download some source code). It's not exactly what you need to do, but in the wiki page I explain what you need to change from the boilerplate sample that MS provided.
http://developer.nokia.com/community/wiki/Template_universal_app_for_video_recording_with_MediaCapture_using_Imaging_SDK_Filters
I recently found a way to convert video's through the FFMpeg converter through command line, but ive recently been interested in making a video player! and i heard that VLC player and various other systems use FFPlay, and i dont know anything about it! so i have some main points of interest..
Questions:
What exactly does the ffplay.exe do?
If it allows me to stream videos, how would i create an interface to C# to use that
How would i display the video on a windows forms app.
If one of those is not possible, im welcome to other alternatives.. or even perhaps writing my own. Suggestions welcome! :)
Edit: im looking for possible solutions with a framework requirement of 3 or below, and also would perfer to not make them install anything additional to my program.
I am not expert but based on what I know,
You can perhaps look at DirectShow technology for developing your video player as there are managed lib such as directshow.net available for it.
To my knowledge, FFPlay is GUI on top of FFmpeg libraries - the main part of FFmpeg is audio/video codec library supporting many formats including MPEG-4 implementation.
To use FFmpeg via DirectShow, you need another component known as ffdshow.