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2017-02-14 13:08:59 -0600 | answered a question | Using custom opencv_ffmpeg*.dll version on Windows I built a custom opencv_ffmpeg*.dll from a 3.2.0-dev version of the code (23 Dec 2016 8:20, commit 7dd3723), with some instructions, here. |
2017-02-14 13:01:51 -0600 | answered a question | How to build opencv_ffmpeg.dll from patched FFmpeg source This worked for me to build the 64-bit FFmpeg API from source: 1. Build the FFmpeg .a static library archives(which are object that are inputs to a linker). On 64-bit Windows, I configured the FFmpeg build like this:
2. Copy the .a static library archives into a folder in the OpenCV source folder under \3rdparty\lib, and add the suffix 64 for the 64-bit archives:
3. Copy all the C/C++ header files in the FFmpeg source directory to a new OpenCV source directory called \3rdparty\include\ffmpeg_. For example:
4. In the OpenCV \3rdparty\ffmpeg folder, create a file called ffopencv.c, with these contents:
5. From the OpenCV \3rdparty\ffmpeg folder, run the following from the Windows command line with Cygwin and MingW installed:
This will produce the opencv_ffmpeg320_64.dll (or you can use another name, if applicable) in the correct folder. Whenever you change the OpenCV FFmpeg API, you will only have to re-run Step 5. Whenever you change FFmpeg source code, you will have to re-run Steps 1-5. |
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2017-02-06 15:20:20 -0600 | commented question | How to build opencv_ffmpeg.dll from patched FFmpeg source Going to try to follow the steps here: http://code.opencv.org/issues/4362#no... |
2017-02-06 09:49:33 -0600 | commented question | Using custom opencv_ffmpeg*.dll version on Windows Hi, did you ever figure out an answer to this question? |
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2017-02-04 08:03:11 -0600 | asked a question | How to build opencv_ffmpeg.dll from patched FFmpeg source I am trying to write a patch to the FFmpeg API, and I am able to build the FFmpeg library dlls for Windows successfully using the instructions on their website (MinGW/FFmpeg installation guide). However, I'm not sure how to package these various dlls (avfilter.dll, avformat.dll, avcodec.dll, etc.) into the opencv_ffmpeg.dll that the CMake looks for when building OpenCV. I will eventually want to build my custom FFmpeg libraries and OpenCV cross-platform for Linux and Mac OS X, as well. The end game is to have Java-wrapped OpenCV working cross-platform with a modified FFmpeg API. How do I do this? |