OpenCV 2.4.7与FFMpeg支持构建与VS 2010（x86） [英] OpenCV 2.4.7 with FFMpeg support build with VS 2010 (x86)

问题描述

我在使用新版本的OpenCV 2.4.7几乎一个星期（上一个使用2.4.2）。我的新设置的动机是，我遇到问题使用Videowriter的未压缩的灰度视频（ http://answers.opencv.org/question/3603/videowriter-videocapture-and-uncompressed-avi/ ）。在 https://github.com/Itseez/opencv/pull/1516 akarsakov建议在没有vfw支持的情况下构建OpenCV，并通过ffmpeg打开未压缩的视频。这就是我试图做的。我基本上遵循了此视频中提及的说明： http：// docs .opencv.org / trunk / doc / tutorials / introduction / windows_install / windows_install.html

我使用Qt 5.1.1成功构建了opencv href =http://answers.opencv.org/question/24184/how-to-compile-opencv-247-with-qt-and-ffmpeg/ =nofollow> http：//answers.opencv。 org / question / 24184 / how-to-compile-opencv-247-with-qt-and-ffmpeg / ）。但我不能得到VideoWriter& VideoCapture为我工作。所以我做了：

1. 我从 http://ffmpeg.zeranoe.com/builds/




2. 我生成了vs2010项目禁用VfW并启用ffmpeg：

    视频I / O：
    
    Windows视频： b $ b DC1394 1.x：NO 
    DC1394 2.x：NO 
    FFMPEG：YES（预编译的二进制）
   编解码器：YES（ver 55.18.102）
    format：YES （ver 55.12.100）
    util：YES（ver 52.38.100）
    swscale：YES（ver 2.3.100）
    gentoo-style：YES 
    OpenNI：NO 
    OpenNI PrimeSensor模块：NO 
    PvAPI：NO 
    GigEVisionSDK：NO 
    DirectShow：YES 
   媒体基金会：NO 
    XIMEA：NO 
     
    




3. 我将ffmpeg的include目录和lib添加到highgui模块。

我无法编译OpenCV而没有任何错误，但我看到的行为不是我的期望：

1. 在没有VfW的情况下构建OpenCV 2.4.7 - > VideoWriter.open（）总是返回false！


2. 使用VfW - > VideoWriter构建OpenCV 2.4.7。


3. 使用或不使用ffmpeg - > VideoCapture.open（）返回true的时间，在同一对象上调用release（）和open ）给出一个错误消息，要求libiconv-2dll！

有一些问题相同，能够指出我的错误吗？

提前谢谢。
cheers

解决方案

OpenCV 2.4.7需要更新版本的FFmpeg才能正常工作，

问题的原因可能是 错误 ＃2281 ： VideoCapture :: read在未压缩视频中失败。

作为中介解决方案，我建议您降级到OpenCV 2.4.5

I'm fighting with new version of OpenCV 2.4.7 for almost one week (prev. used 2.4.2). My motivation for the new setup is the fact that I run into problems using the Videowriter for uncompressed grayscale videos (http://answers.opencv.org/question/3603/videowriter-videocapture-and-uncompressed-avi/). In https://github.com/Itseez/opencv/pull/1516 "akarsakov" is recommending to build OpenCV without vfw support and open uncompressed video through ffmpeg. That's what I tried to do. I followed basically the instructions mentioned in this video: http://docs.opencv.org/trunk/doc/tutorials/introduction/windows_install/windows_install.html

I had successfully build opencv with Qt 5.1.1 (http://answers.opencv.org/question/24184/how-to-compile-opencv-247-with-qt-and-ffmpeg/). But I'm not able to get the VideoWriter & VideoCapture work for me. So what I did:

1. I downloaded the newest ffmpeg build from http://ffmpeg.zeranoe.com/builds/

2. I generated the vs2010 project disabling VfW and enabling ffmpeg instead:

   Video I/O:
   
   Video for Windows:           NO
   DC1394 1.x:                  NO
   DC1394 2.x:                  NO
   FFMPEG:                      YES (prebuilt binaries)
     codec:                     YES (ver 55.18.102)
     format:                    YES (ver 55.12.100)
     util:                      YES (ver 52.38.100)
     swscale:                   YES (ver 2.3.100)
     gentoo-style:              YES
     OpenNI:                    NO
   OpenNI PrimeSensor Modules:  NO
   PvAPI:                       NO
   GigEVisionSDK:               NO
   DirectShow:                  YES
   Media Foundation:            NO
   XIMEA:                       NO
   

3. I added the include directories and libs for ffmpeg to the highgui module.

I was not able to compile OpenCV without any errors but the behaviour what I see is not what I expect:

1. Build OpenCV 2.4.7 without VfW -> VideoWriter.open () returns always false!
2. Build OpenCV 2.4.7 with VfW -> VideoWriter.open () returns true for the time, calling a release() and an open() on the same object returns always a false.
3. With or without ffmpeg -> An VideoCapture.open () gives a error message asking for libiconv-2dll!

Does some had the same problems and is able to point me to my mistake?

Thank you in advance. cheers

解决方案

OpenCV 2.4.7 requires a more recent version of FFmpeg to work, but that doesn't seem to the issue since you have that covered.

The cause of your problem could be bug #2281: VideoCapture::read fails on uncompressed video.

As an intermediary solution, I suggest you to downgrade to OpenCV 2.4.5.

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