Opencv Ffmpeg

Consult your locally installed documentation for older versions. 1) preparation #1 Install required packages using Cygwin's setup. Download Latest Version opencv-4. 3 and integrated Camera Problems! gstriff-1. I followed this tutorial. What's in the Works: Improving Feedback for All. Eventually, I gave up on trying to install and reinstall opencv3. x installation. How can we cross-compile opencv with PDK 5. SDK does not contain default FFMPEG and V4L2, install these packages by : sudo apt-get install libx264-dev libx265-dev libvpx-dev ffmpeg; sudo apt-get install v4l-utils libv4l-dev; The proper DCUDA_ARCH_BIN variable need be set in CMake configurations:-DCUDA_ARCH_BIN=6. You can modify the packages to use for the build in the WITH > WITH_X menu points (where X is the package abbreviation). NET languages such as C#, VB, VC++. All wheels ship with FFmpeg licensed under the LGPLv2. 3-openvino- Operating System / Platform => Linux Ubuntu 16. My system has: Windows 10 CMake 3. NET is a C# framework designed for developers and researchers in the fields of Computer Vision and Artificial Intelligence - image processing, neural networks, genetic algorithms, machine learning, robotics, etc. 04 again, but there is still no official package for 14. With Safari, you learn the way you learn best. Aug 19, 2017 gradlew. GitHub Gist: instantly share code, notes, and snippets. 04 running on Docker, my guess is if I have to compile ffmpeg from scratch with a specific prefix path and pass this to OpenCV. FFmpeg has been removed from Ubuntu 14. Opencv-python package (scripts in this repository) is available under MIT license. Cross-Platform C++, Python and Java interfaces support Linux, MacOS, Windows, iOS, and Android. A few members of my family kept telling me that I was spending too much time in front of my laptop. com/gxubj/ixz5. 264 based RTSP stream using FFMPEG in OpenCV but, when I tried so it gave some errors. Unofficial Windows Binaries for Python Extension Packages. dll to the installation directory of the program that is requesting opencv_ffmpeg. Check out CamelPhat on Beatport. In this article, I walk you through installing FFmpeg and provide a few instructive examples to demonstrate the range of applications for which it can be used. Deprecated: Function create_function() is deprecated in /home/forge/primaexpressinc. This post is about the experience to compile OpenCV on Ubuntu 14. Cross-Platform C++, Python and Java interfaces support Linux, MacOS, Windows, iOS, and Android. To draw to the screen, we're going to use SDL. Compiling on a regular computer isn't easy , but compiling for the Raspberry Pi takes a little more patience and care. I have an IP security camera (192. How do I make FFMPEG check yes while installing OPENCV. Any idea how I can make this combination work? Is it an OpenCV bug, FFmpeg bug, or neither?. 04 using Command Line terminal. sudo yum install libpng-devel libjpeg-turbo-devel jasper-devel openexr-devel libtiff-devel libwebp-devel libdc1394-devel libv4l-devel gstreamer-plugins-base-devel gtk2-devel tbb-devel eigen3-devel gstreamer1-libav gstreamer1-plugins-base-devel java-1. Opencv opencv example Computer vision opencv c++ tutorial Opencv C++ Opencv tutorial Opencv Visual Studio 2015 computer vision applications Computer vision news Business computer vision opencv 3. Step-by-Step Setup and Installation FFMPEG with NVIDIA Acceleration on Ubuntu Linux DU-07857-001_v01 | 3 INSTALL THE DISPLAY DRIVER 1. Ffmpeg Opencv. Gallery About Documentation Support About Anaconda, Inc. Use the following commands on your terminal to install FFmpeg 3. openCV on windows mobile. OpenCV can be downloaded from the official OpenCV website. Third party package licenses are at LICENSE-3RD-PARTY. Install OpenCV with ffmpeg and CUDA. Download32 is source for ffmpeg opencv shareware, freeware download - OpenCV , Solid FFmpeg ActiveX Wrapper , Solid FFmpeg C#. The site-packages folder is where we will copy the ephem folder after installing it. 1-vc14_vc15. In windows just use Opencv Installation by Nugets packages Here. properties init android opencv ffmpeg project. How do I make FFMPEG check yes while installing OPENCV. FFmpeg is published under the GNU Lesser General Public License. The purpose of these packages is to provide as easy as possible installation experience for OpenCV Python bindings and they should work directly out-of-the-box. Please feel free to add links to your own examples below. To get devices name in pc run following code on command line. 0, where is the base opencv source code and to the empty folder created by you called build. pc in /usr/lib64/pkgconfig/ but I have tried copying opencv4. Type the following in: make -j8 sudo make install. Cross-Platform C++, Python and Java interfaces support Linux, MacOS, Windows, iOS, and Android. Hi, I tried to run this script on my Mac OSX with opencv 3. Therefore you have to use another library like FFmpeg to capture the sound from a video file or a microphone. It can be omitted most of the time in Python 2 but not in Python 3 where its default value is pretty small. hpp:365 opencv打开视频出现错误提示! 很多人说是路径错误,但我很确定,视频路径没有错误呀!. OpenCV (open source computer vision) is released under a BSD license and hence it's free for both academic and commercial use. My system has: Windows 10 CMake 3. The errors at the end of your console log all seem to be related to FFmpeg. 3 and integrated Camera Problems! gstriff-1. So, the whole content below is just for research purpose only. 0 we've changed the version enumeration scheme, so that 3. I downloaded OpenCV 3. Books; Links; Platforms; Releases * OpenCV - 4. After rebuilding frei0r with opencv-legacy, and then building ffmpeg with all options, i rebuilt transcode, then vid. dll opencv_ffmpeg_64. Overlay package installed correctly, but the nupkg is not in the expected location. FFmpeg is a free and open-source project consisting of a vast software suite of libraries and programs for handling video, audio, and other multimedia files and streams. 04 running on Docker, my guess is if I have to compile ffmpeg from scratch with a specific prefix path and pass this to OpenCV. Add path to opencv-3. For using non free codecs, you can compile OpenCV yourself (which takes time) or you can pipe OpenCV with FFMPEG. This is the first stabilization update in 3. Second reason: "external" FFmpeg API is not very stable and there is no way to guarantee work with custom FFmpeg prebuilt versions (OpenCV's FFmpeg wrapper has fixed FFmpeg version and it is tested before integration into OpenCV). dllのlibファイルが見つかりませんが…こんにちは、OpenCV初心者です。 CvCaptureタイプを使って、色んな動画ファイルでテストしてみた所、読み込みのできる動画と出来ない動画があることが分かりまし. 2 with Eclipse and MinGW on Windows 10. NET compatible languages such as C#, VB, VC++, IronPython etc. We are going to build OpenCV using cmake. precise commands to install ffmpeg, libavformat-dev,. 10 x64 (intel processor). I will show, how get frame from webcam with FFmpeg Api and processing frame with OpenCV. It allows one to call OpenCV functions into the. I brew install ffmpeg and I uninstall opencv and re-install it with ffmpeg flag. Since version 2. ALso in OpenCV 2. dll: Copy file opencv_ffmpeg. How do I make FFMPEG check yes while installing OPENCV. Installing OpenCV 3. After installing, we will do some tests to verify the installation and also see some examples. Face and Eye Detection With Raspberry Pi Zero and Opencv: In this instructable i'm going to show how you can detect face and eye using raspberry pi and opencv. rtmp streaming from opencv with ffmpeg / avcodec. Hey everyone, I'm using opencv with ffmpeg to get frames from an RTSP stream(i. 5, then the build is ok but not the bin/opencv_test_xxx which failed on many different points, and so in my owns programs the VideoCapture failed at the opening. By default OpenCV is shipped with royalty free codecs only. So I've built it with --enable-vaapi and --enable-hwaccel=h264. Opencv_ffmpeg module crash (IP camera) add the camera to a window using c++. Assuming ffmpeg for Android was built, this blog post shows how to proceed building OpenCV for Android with ffmpeg as a 3rd-party library. App written in 2013 demo recorded in 2016. dll不用担心。找DLL下载站免费提供各类DLL文件下载。. 2 uses cmake to build. ffmpeg -i myfile. Description. I required ffmpeg with android, binding opencv with ffmpeg in native code and displaying the resultant frame on the screen. x ) with Python and CUDA support without messing up your OpenCV 2. OpenCV itself is available under 3-clause BSD License. OpenCV's native colour space, BGR, is known to FFmpeg and if you allocate you own Mat then the memory layout is continuous. We use cookies for various purposes including analytics. isOpened() == Falseとなりvideoは空の配列のままになっていました。 動画を書き込む. When opencv_ffmpeg310_64. Now we just have to read the output of. Hey everyone, I'm using opencv with ffmpeg to get frames from an RTSP stream(i. How to Install FFmpeg on Windows. 1 for image processing with IP cameras. Windows: How to install the module 'ephem'? Locate site-packages folder: If you installed python on C drive, mostly the site-packages locates on C:\Python27\Lib\site-packages. JavaCV - OpenCV の Java ラッパーだが、FFmpeg のラッパーも含む; FFmpegに含まれるライブラリ群は多数のマルチメディアアプリケーションにより利用されている。. I haven't made the jump to OpenCV 3 yet, but when I had a contract that called for reading and writing video, I ran into similar issues using OpenCV 2. In this post I will describe the process of installing OpenCV (both versions 2. It is free and available for Windows, Mac and Linux machines. py rtsp://973704:[email protected] 1; win-32 v3. Coming from a network camera). Net Wrapper , OpenCV wrapper for LabVIEW , VisioForge FFMPEG Source DirectShow filter, etc. libopencv and opencv-devel first line of decription i the same ("Development files for using the OpenCV library"), but opencv-devel description says that it contains library and headers. Notice: Undefined index: HTTP_REFERER in /home/forge/newleafbiofuel. {"serverDuration": 39, "requestCorrelationId": "004f5cfcf654a778"} Confluence {"serverDuration": 39, "requestCorrelationId": "004f5cfcf654a778"}. x installation. If that doesn't work, you will have to copy opencv_ffmpeg. This post is about the experience to compile OpenCV on Ubuntu 14. 0xC0000005: Access violation reading location 0x00000020. I think about a solution with ffmpeg and live555 (poorly they are not document so well). Later, I found that many people have. 100 libavformat 58. OS: Centos 6, 64bit The ffmpeg has been already installed via following commands. I like to stream the web cam pictures wich are captured by opencv. i686 libpng-devel libjpeg-turbo. How do I make FFMPEG check yes while installing OPENCV. ALso in OpenCV 2. dll (version for 32-bit Windows) and opencv_videoio_ffmpeg_64. Homebridge ffmpeg h264. FFmpeg is a free and open-source project consisting of a vast software suite of libraries and programs for handling video, audio, and other multimedia files and streams. Looks like 1. 04; Compiling OpenCV with CUDA support ; Compiling OpenCV for CUDA for YOLO and other CNN libraries; Build OpenCV Jetson TX 2; How can I install gstreamer 1. It correctly removes the initial specified seconds specified with -ss but then keeps going to the end of the input with the copy. GitHub Gist: instantly share code, notes, and snippets. Find out the service status of NuGet. I open "ProcessExplorer" and see now application using opencv_ffmpeg310_64. Pro Digispark DJI Tello Dragonboard ESP8266 GoPiGo3 Holystone HS-200 Intel Curie Intel Edison Intel Joule Joystick Keyboard Leap Motion Mavlink Microbit MQTT NATS Neurosky Mindwave OpenCV Parrot ARdrone Parrot Bebop Parrot Minidrone Particle Pebble PocketBeagle Raspberry Pi Sphero Sphero BB-8. I've tried installing it before using pip3 (Python 3. OpenCV (open source computer vision) is released under a BSD license and hence it's free for both academic and commercial use. 说明: 一个采用FFMPEG对视频进行解码、采用OPENCV对物体进行跟踪的 跟踪示例程序。 (A use of FFmpeg for video decoding, using OPENCV object tracking sample tracking procedures. Exception thrown at 0x0BF2F6F0 (opencv_ffmpeg310. 10 and are licensed as GNU GPL 3. openCV on windows mobile. Hello, I was planning to decode H. 0-openjdk-devel. 9 MB) Get Updates. In OpenCV, a video can be read either by using the feed from a camera connected to a computer or by reading a video file. Get project updates, sponsored content from our select partners, and more. OpenCV will be used on the clients to read the situation and send new tasks to the robots. I downloaded new ffMpeg and installed it, downloaded opencv-1. Manylinux and macOS OpenCV binaries are not compiled against it. Steps to install FFmpeg with all modules How to install FFmpeg with all modules? FFmpeg is a free software, handling multimedia data by produces programs and libraries and managing of audio or video streams. For installation instructions please read the FAQ. 1 works with Python 2. Docs Make sure proper versions of ffmpeg or gstreamer is installed. 2 and I tried to build it through cmake-gui. 1a) and compiled both packages with -enable-shared -enable-pic. Example VNF Charms. CAP_FFMPEG Open and record video file or stream using the FFMPEG library. php on line 143 Deprecated: Function create_function() is. It has more than 2500 optimized. videoCapture() return always false". OpenCV (Open source computer vision) is a library of programming functions mainly aimed at real-time computer vision. Do I have to compile openCV with ffmpeg enabled? But how can I do that when ffmpeg needs to be compiled with openCV enabled? Was mostly following this installation guide for FFmpeg. OS: Centos 6, 64bit The ffmpeg has been already installed via following commands. After compiling and installing OpenCV for the first time, I wanted to figure out how to read from an existing video file on my hard drive and display it on my screen. x with FFMPEG , Python on Anaconda If you need to load, display or process videos using OpenCV, it is a pain to have all these installed and configured to work correctly on Ubuntu 14. NET compatible languages such as C#, VB, VC++, IronPython etc. com/public/1zuke5y/q3m. This, we hope, is the missing bridge between Java and C/C++, bringing compute-intensive science, multimedia, computer vision, deep learning, etc to the Java platform. dll opencv_ffmpeg_64. How can we cross-compile opencv with PDK 5. EmguCV is a cross platform. By continuing to use Pastebin, you agree to our use of cookies as described in the Cookies Policy. I required ffmpeg with android, binding opencv with ffmpeg in native code and displaying the resultant frame on the screen. FFmpeg has two encoders to output MPEG-4 video. After I ran the cmake command, the installation begin, but the process return error, and ALL FILES IN MY UBUNTU. In my opinion, this issue is somewhat still relevant even with OpenCV 3. Opening the File. Arduino Beaglebone Bluetooth LE C. you could be able to force it to use it and tweak it for your needs. This entry was posted in FFmpeg, OpenCV, QT and tagged avframe to iplimage, capture frame from rtsp stream with ffmpeg, capture image from rtsp stream with ffmpeg, convert avframe to iplimage, ffmpeg api qt, ffmpeg avframe to opencv mat, ffmpeg c++ examples, ffmpeg example, ffmpeg example decode, ffmpeg libavcodec av_read_frame example, ffmpeg. Opencv_ffmpeg module crash (IP camera) add the camera to a window using c++. precise commands to install ffmpeg, libavformat-dev,. CAP_IMAGES OpenCV Image Sequence (e. Got questions about NuGet or the NuGet Gallery? Status. 8) I can see the ffmpeg in my machine if I type ffmpeg in the terminal but how can I see. In theory it would work with the system package, I just haven't tried. It is more hack than proper install. i'm rebuilding just to be sure, but you should follow dutchdaemon's advice Click to expand yes, I'm newbie in FreeBSD. Thank you Roger. This wikiHow teaches you how to install FFmpeg onto your Windows 10 computer. I required ffmpeg with android, binding opencv with ffmpeg in native code and displaying the resultant frame on the screen. OpenCV is a highly optimized library with focus on real-time applications. OpenCV (open source computer vision) is released under a BSD license and hence it's free for both academic and commercial use. The exact bit depth is controlled at x264's configure time. Docs Make sure proper versions of ffmpeg or gstreamer is installed. In this post we will see how to Install FFmpeg On Ubuntu 16. OpenCV itself is available under 3-clause BSD License. Home | Archive. ffmpeg can be compiled with either GPL or LGPL license, depending on which components are used. FFmpeg Git, releases, FATE, web and mailinglists are on other servers and were not affected. opencv 를 사용하면서 왜 동영상을 재생하는대 소리는 나오지 않는걸까? 동영상 파일을 재생하면서 이미지만 보는것은 도대체 무슨 ㅡ,ㅡ 그래서 내가 하기로 결심했다. Not all codecs are supported by SIVP and it depends on the codecs you have installed. 動画処理をする際にffmpegを使用することがあると思います.(リンク:FFmpeg). dll Also the video file has some kind of interlines capture, and after capture. 3-openvino- Operating System / Platform => Linux Ubuntu 16. SDK does not contain default FFMPEG and V4L2, install these packages by : sudo apt-get install libx264-dev libx265-dev libvpx-dev ffmpeg; sudo apt-get install v4l-utils libv4l-dev; The proper DCUDA_ARCH_BIN variable need be set in CMake configurations:-DCUDA_ARCH_BIN=6. Now you have to go to each folder and make sure to checkout the version 3. Open Computer Vision Library. 2 was released on 2019-08-05. Configure and Build FFMPEG-0. To use a specific FFmpeg version, just run it like this: On Medium, smart voices and original ideas. Face and Eye Detection With Raspberry Pi Zero and Opencv: In this instructable i'm going to show how you can detect face and eye using raspberry pi and opencv. Homebridge ffmpeg h264. read(mat) procedure, the height ot the output mat is half of original video frame (536 instead of 1072). com/public/1zuke5y/q3m. 3、 使用 opencv 作图像处理时, 可使用 cvCaptureFromCAM 函数, 这个函数还是间接用到了 v4l 的库。(具体请查 opencv 的说明文档!) 4、 将图片压缩为视频, 可以使用 ffmpeg 的库, 请看 ffmpeg 的说明文档。. Thanks to the huge variety of Linux distros, I've seen it crap out for the strangest reasons. Bytedeco makes native libraries available to the Java platform by offering ready-to-use bindings generated with the codeveloped JavaCPP technology. Enter the and type. 1pre1 and SVN have the same line. I like to stream the web cam pictures wich are captured by opencv. Any idea how I can make this combination work? Is it an OpenCV bug, FFmpeg bug, or neither?. Passing grayscale OpenCV image to an OpenGL texture. This feature is not available right now. mp4 Here, we assume that the video file does not contain any audio stream yet, and that you want to have the same output format (here, MP4) as the input format. Have no idea if I need to re-install the ffmpeg module and OpenCV. There were days when we had to painstakingly go through the manual install process for getting OpenCV running on our systems. 0 cloud computer vision Computer vision business Visual Studio 2015 Computer vision on the road Internet of things Tutorial blog ffmpeg opencv 3. ROS - OpenCV 3. Download FFmpeg for Android for free. How to Build FFmpeg For Android by Roman10. Install OpenCV with ffmpeg and CUDA. I downloaded OpenCV 3. Aug 19, 2017 gradlew. In the rest of this blog post, I'm going to detail (arguably) the most basic motion detection and tracking system you can build. VideoCapture( on ubuntu server. 3 on Ubuntu 16. Opencv_ffmpeg module crash (IP camera) add the camera to a window using c++. hi, I have successfully cross compiled opencv with ffmpeg according to this guide. Before we do that, allow me a digression into a bit of history of video capture. First “opencv” and second “opencv_contrib”. Third party package licenses are at LICENSE-3RD-PARTY. Open Computer Vision Library. OpenCV-Python Tutorials. You can modify the packages to use for the build in the WITH > WITH_X menu points (where X is the package abbreviation). Sometimes, it is a headache to work with Video Capture mostly due to. Description. FFmpeg is published under the GNU Lesser General Public License. Use the following commands on your terminal to install FFmpeg 3. ROS tends to be pretty picky about library versions, so my main concern would be subsequent breakage should the arch version move farther ahead than Kinetic expects. If you do not wish to use FFMPEG due to licensing concerns, simply remove the dll from the folder and Open CV will not use FFMPEG. Opencv Slam Tracking. We are going to build OpenCV using cmake. Pythonで動画を扱うためにFFmpegとOpenCVをインストールします。環境はUbuntu16. I will not provide any guidelines about how to build ffmpeg for android and use in the native code as there is a good source available. When opencv_ffmpeg310_64. If your GPU is AMD, you have to use OpenCL. Following are the instructions to install OpenCV on Ubuntu machine. Enter the and type. I open "ProcessExplorer" and see now application using opencv_ffmpeg310_64. 04; AWSでOpenCV にてCUDAを使えるようにした. Image show 40. h" issue -. i686 libpng-devel libjpeg-turbo. 1-vc14_vc15. dll下载,丢失或缺少opencv_ffmpeg_64. 動画を書き込むときは、VideoWriterを使います。. Install OpenCV on Ubuntu or Debian. Scientific Python on Windows March 7, 2016 March 7, 2016 cajomferro Leave a comment After several experiments, I really think that WinPython is the best option for Windows when working with Scientific Python. The wrapper can be compiled by Visual Studio, Xamarin Studio and Unity, it can run on Windows, Linux, Mac OS X, iOS, Android and Windows Phone. Many Thx Thanh. dll: Copy file opencv_ffmpeg. SIVP can only read frames one by one using avireadframe. Stay ahead with the world's most comprehensive technology and business learning platform. The key is to have installed the FFMPEG espetially in case of reading the strem of IP cameras. OpenCV截取的视频是极为精准的但是没有声音。 ffmpeg进行转码的时候也是非常精准的,但是转码视频会内存占用很大。 那么就用OpenCV截取视频,ffmpeg截取音频,然后合并音频和视频. videoCapture() return always false". Hi Ernest — to get FFMPEG support for OpenCV, you'll need to (1) install FFMPEG on your Ubuntu system, (2) compile OpenCV with the -D WITH_ffmpeg=ON flag set (you should also make sure that's the correct flag, I'm doing this from memory since it's been a long time since I've had to use FFMPEG), and then (3) re-install OpenCV once. a) to OpenCV, in addition to the updated ffmpeg core libraries. x installation. Many Thx Thanh. Use the following commands on your terminal to install FFmpeg 3. In the rest of this blog post, I'm going to detail (arguably) the most basic motion detection and tracking system you can build. 0 cloud computer vision Computer vision business Visual Studio 2015 Computer vision on the road Internet of things Tutorial blog ffmpeg opencv 3. 1 Version of this port present on the latest quarterly branch. 1a) and compiled both packages with -enable-shared -enable-pic. dll解压放到 opencv\sources\3rdparty\ffmpeg\下即可 立即下载 上传者: jerry_yu_1 时间: 2016-08-05. On Linux OpenCV must be compiled with video support and the newest version of OpenCV is recommended. See also: Video I/O Code Reference; Tutorials: Video Input and Output (videoio module) General Information. 264 based RTSP stream using FFMPEG in OpenCV but, when I tried so it gave some errors. Many of these algorithms have GPU accelerated versions based on the equally popular NVIDIA CUDA. Download FFmpeg for Android for free. RTSP Client with OpenCV + FFMPEG. It ends up at 608x406 or thereabouts. I have summarized my now fully working solution OpenCV-Python - How to install OpenCV-Python package to Anaconda (Windows). 1 is the same sort of update to 3. Install OpenCV 2. 1 先安装EPEL Release,使用其他的repo源,所以需要EPEL支持. dll to your system directory. Opencv_ffmpeg module crash (IP camera) add the camera to a window using c++. FFmpeg Static Builds. This video of Filipina girls faces was created using OpenCV, FFmpeg, Python, Bash Script. With respect to Python API, latest version will always contain much better support. Following are the instructions to install OpenCV on Ubuntu machine. To use a specific FFmpeg version, just run it like this: On Medium, smart voices and original ideas. Homebridge ffmpeg h264. dll problems. Net Wrapper , OpenCV wrapper for LabVIEW , VisioForge FFMPEG Source DirectShow filter, etc. Type the following in: make -j8 sudo make install. Basically, the module provides the cv::VideoCapture and cv::VideoWriter classes as 2-layer interface to many video I/O APIs used as backend. *Streaming from Cam using FFMPEG & OpenCV. pc in /usr/lib64/pkgconfig/ but I have tried copying opencv4. OpenCV截取的视频是极为精准的但是没有声音。 ffmpeg进行转码的时候也是非常精准的,但是转码视频会内存占用很大。 那么就用OpenCV截取视频,ffmpeg截取音频,然后合并音频和视频. This is so that VideoWriter is available in OpenCV4Android. In my opinion, the following packages (and their depending packages) are our minimal needed packages:. 04; Compiling OpenCV with CUDA support ; Compiling OpenCV for CUDA for YOLO and other CNN libraries; Build OpenCV Jetson TX 2; How can I install gstreamer 1. Opencv_ffmpeg module crash (IP camera) add the camera to a window using c++. He cofirmed that the current implientation is "by design". In my opinion, this issue is somewhat still relevant even with OpenCV 3. But another important feature of Python is that it can be easily extended with C/C++. At its core is the FFmpeg program itself, designed for command-line-based processing of video and audio files, and widely used for format transcoding, basic editing (trimming and concatenation), video scaling, video post. What flags/configuration is required to include those two directories in the pr. It was quite hard to find the correct information. OpenCV provides a very simple interface to this. Later, I found that many people have. dll下载,丢失或缺少opencv_ffmpeg_64. I downloaded new ffMpeg and installed it, downloaded opencv-1. I'm trying to get the stream from a RTSP camera by calling python ffmpeg_opencv. Second reason: "external" FFmpeg API is not very stable and there is no way to guarantee work with custom FFmpeg prebuilt versions (OpenCV's FFmpeg wrapper has fixed FFmpeg version and it is tested before integration into OpenCV). The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: