directshow

问题 I'm using DirectShow with a simple approach (IGraphBuilder RenderFile) and try to control everything else with querying supplemental interfaces. The option in question is aspect ratio. I thought that it is maintained by default, but actually the same program behaves differently on different machines (maybe versions of DirectX). This is not a huge problem for a video in a window, because I can maintain the aspect ratio of my window by myself (based on the video size), but for full-screen mode

问题 I'm using DirectShow with a simple approach (IGraphBuilder RenderFile) and try to control everything else with querying supplemental interfaces. The option in question is aspect ratio. I thought that it is maintained by default, but actually the same program behaves differently on different machines (maybe versions of DirectX). This is not a huge problem for a video in a window, because I can maintain the aspect ratio of my window by myself (based on the video size), but for full-screen mode

问题 We have a c# application that performs processing on video streams. This is a low-level application that receives each frame in Bitmap format, so basically we need 25 images each second. This application is already working for some of our media sources, but we now need to add a webcam as an input device. So we basically need to capture bitmap images from a webcam continuously so that we can pass all these frames as a "stream" to our application. What is the best and simplest way to access the

问题 I'm extending an application to play one of several videos on a control in a dialog. Starting with the Windowless sample, I've got this working, though the videos have to be separate files from the main executable. The ideal scenario from a packaging standpoint is for the videos to be included with the executable as resources. I did a bit of googling for this, and there's a fair amount of "somebody should do this", and several pointers to the Async sample, though it's not clear how to get

问题 I am using Media Foundation to play videos. On windows 7 some videos encoded with Mpeg1/Mpeg2 PS and Windows Media Player can play them, but Media Foundation does not(I tried to register a stub MPEG1Source but it still does not work). I noticed some of these files could be played with directshow but not Media foundation(can not be open at all). I guess "media player" does not use Media Foundation only? Is it possible to use Media Foundation to play these file? If it is not, how does Media

问题 I'm working in an app in wich we use IMediaDet to get stream lengths. Now we're starting to work with MP4 containers. The problem is, when I try an IMediaDet::put_fileName() with the MP4 file, I get HRESULT = -2147024770 (ERROR_MOD_NOT_FOUND). Using a comercial mp4 demuxer, I see the video stream uses mpg2 encoding. My questions: How to get the stream length of a stream inside a MP4 container? Is there a way to make IMediaDet accept these files? Is there a way to point what demuxer IMediaDet

问题 I'm messed up with codec issue for days, and still couldn't see the big picture yet. It is my first time to deal with audio/video formats and codecs. So I really need some help about that. Here is the work. I'm writing several components that is responsible for encoding and decoding customized mpeg files. On top of standart de/compression process (for both audio and video) i will implement some custom de/encryption. Writing both codec and software libraries for this. Things i can't figure out

问题 I'm working on a solution that will be used to receive video stream from remote hosts and to put various texts on the top of it. Currently it consists of custom DirectShow push filter (C++) which receives data from remote hosts using RTP protocol and tiny C# application that sets up the DirectShow graph and is used as a container for the video. I'm using DirectShowLib interop library. However, I'm not sure how to pass parameters from this C# app to my custom filter. What are possible ways to

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 4 years ago . I'm a .Net C# Developer. I want to develop the media programming about video/audio codec, capture media from source, etc. I'm going to use the DirectShow Lib, but I read it on MSDN, and I'm very confused, because I'm a beginner. Do you have the best tutorials or some article that can make beginner understand to

问题 I'm having a great trouble trying to understand this, what's the least set up to compile/run directshow apps? I've already installed visual c++ 2008 express. A hello world will be nice, RGS! 回答1: Try downloading SDK such as Windows SDK "http://www.microsoft.com/downloads/details.aspx?FamilyID=6b6c21d2-2006-4afa-9702-529fa782d63b&displaylang=en". There are usually a bunch of samples for directshow. But, mainly they either use commandline "nmake" (not make) or "cl" (not cc or gcc) to build.