I am developing an application in which I need to capture and display as well as record live video feed coming from an input camera or any other source.
I am working on Windows 7 64 bit machine and building my application in C++ using Visual Studio. Now since I will be archiving all the videos, so along with my application I need to provide a video archive manager which can easily save them and attach tag to the videos based on their name and timestamp and fetch them based on some query. I dont want to write the whole archive manager by my self because of time constraints. So can anyone suggest some open source or even some proprietary tool which can do this for me.
If you don't want something elaborate, you can use the OS IpropertyStore to update metadata for the file and use Windows Search to retrieve them.
IPropertyStore to update tags
ISearchQueryHelper for searching them.
Developing Property Handlers for Windows Search shows more.
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My ultimate goal is to have map data (offline, because I will customize it myself) and display it in an app (Android). I could make osmdroid work to load maps online and I was trying to figure out how to download and display offline maps. I downloaded MOBAC (Mobile Atlas Creator) and export the data to SQLite format and when I had a look at it I realized that tiles are saved in image format (PNG).
What I would like to do is to import data to the phone to later use it in algorithms such as a search engine or a routing algorithm, so I need the "nodes" and "ways" (as I get them from the original OSM XML), import them to the phone and visualize it to later have this data available for the algorithms I want to develop. Basically, what MAPS.ME does. I think it wouldn't be difficult to convert the XML into the SQLite since a simple script could make it, but then, how can I generate the tiles from this custom SQLite database? Or, is there a way I can download the data in a more appropriate way to do what I'm planning to do?
Thanks.
Rendering the tiles in an app from raw Openstreetmap data would be computation heavy and inefficient. I would suggest to use image tiles you exported for visual representation.
In addition to tiles you should export a data set you will need in the application for desired functionality. You will not need all data from Openstreetmap so you should identify what you need and build your custom export (there are tools and libraries for processing and filtering of Openstreetmap data. I have used pyosmium for some filtering and processing but there are others.) For example, you can build your custom database with POIs you want to search for.
Routing is another chapter. You can implement it yourself but it is a very complex task. There is java library called Graphopper which can do the data extraction (from Openstreetmap) and offline routing for you. They have an online API too but it is possible to make it working completely offline (I did it for one application). Try to look at the source code because than you can see how complex topic routing is. Final note: data exported from Graphopper contains information about some POIs along routes. It may be possible to search for some things via its java API but I haven't investigated this yet.
I found this link where it shows how to get the owner of the file but is there anyway we can also get the author of the file using windows api and C++?
author of the file
No such thing exists in Windows filesystems.
You might be confused by a descriptive metadata stored in some data formats, such as PDF, DOC, various image, audio and video formats.
Retrieving this metadata is obviously format-specific (there might be libraries for that).
Also, metadata is optional and not all the files contain it.
I just purchased and installed a application from 3 Cds using registration key in pendrive. After installation, I just got a MFC Application (.exe). When i viewed the files, I found a data folder inside which I found many .scd files. The data is accessible within the application.
Now I would like to extract that scd files and need those data alone
separately.
I tried with FileViewPro, Scribus and many exe reader Software, but not successful.
Please someone help me to read the .scd files to extract the data from it.
Thanks in Advance,
First of all, please clarify what is the MFC application you are referring to? Was it installed? How do you know that it is MFC app?
Secondly, by giving just a file extension you do not provide enough information about a file. it could be MD scheduler, MS system management, TurboTax and many more.
The only way to do what you need is to find an application that does that or learn about a file format from documentation and write your own application.
It may be impossible if the file is proprietary format and there is no documentation released.
I am just starting to learn DirectShow with C++. I need to use DirectShow to record the audio and write it to a WAV file on the disk. I heard from other people that Win 7 does not allow for rendering audio using DirectShow.
In addition, I would like to know how should I start with recoding audio using DirectShow with C++? If there is sample source, it would be great.
Thanks in advance.
I think you may have misunderstood these other people. Windows Media Foundation is aimed to be the successor of DirectShow, but DirectShow is still a very valid technology on Windows 7.
The easiest thing to accomplish what you want to do, is to get it right using the GraphEdit tool first ( I assume you want to do this programmatically).
Create a graph that contains your audio device, a WavDestFilter, and a file writer.
Source -> WavDest -> File Writer
Play the graph. Stop the graph and you should have created a .wav file with the recorded audio. If you can get this right, then you need to do the whole thing programmatically.
There are a couple of samples in the SDK that show you how to programmatically add filters to a graph and connect them, that should enable you to get started.
WRT the WavDestFilter, IIRC it might not be in all versions of the SDK, you'll have to find an appropriate one. You also need to build it, and regsvr32 it, so that it will show up in your list of available filters in GraphEdit.
If this all seems a bit much, I would read through the DirectShow documentation on MSDN to at least get an overview of DirectShow.
I'm looking for build in library for converting videos/images. i heard something about DirectShow. Do you know any library you have used to convert videos/images?
For transcoding (converting one video format to another) using Directshow is bit tricky, you want to use Media Foundation for this job.
There is Transcode API available in Media Foundation to achieve this task. This link has more details on Transcode API, tutorials and samples to get you started.
You can use DirectShow for grabbing images from video stream. For it you must create your own filter node. It is complex task because of filter is COM object that will work within chain (DirectShow filter graph) of other filter nodes - codecs. So after creating you need register your filter in system. As for me i think you can try it because you can use all registered codecs in system and as result get decompressed/final image into your filter. As other solution i think that you can try to use modules from some open source media player. For example try VideoLAN but as i know it is big thing and not easy to use.
Good luck!