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Sur d’autres sites (6678)

  • FFMPEG joining multiple videos in grid

    31 mars 2020, par Adam Gosztolai

    I am trying to join a series of videos in a grid. Here is a command I used for 3 videos.

    ffmpeg -y -i /mnt/labserver/vid1.mp4 -i /mnt/labserver/vid2.mp4 -i /mnt/labserver/vid3.mp4 -filter_complex "color=s=360x360:c=Black [nbase];[0:v]setpts=PTS-STARTPTS,scale=180x180[b0];[1:v]setpts=PTS-STARTPTS,scale=180x180[b1];[nbase][b0]overlay=shortest=1:x=0:y=180[temp0];[temp0][b1]overlay=repeatlast=1:x=0:y=360[temp1];[temp1][b2]overlay=repeatlast=1:x=0:y=540[temp2]" -c:v libx264 -pix_fmt yuv420p /mnt/labserver/videos_joined.mp4

    I get the following error

    Invalid stream specifier: b2

    As far as I recall this has previously worked for me. Could someone tell me what could be wrong here and whether perhaps the error depends on the FFmpeg version ?

    Thank you !!

  • Point CMake project to specific include file

    16 novembre 2011, par Unapiedra

    I am trying to build OpenCV 2.3.0 with FFMPEG enabled. Since Ubuntu 11.10 only supplies libavcodec/format with version 0.7 and the ticket #1020(link below) indicates that it should work with 0.8.

    If I try to compile I get the following error :

    [ 18%] Building CXX object modules/highgui/CMakeFiles/opencv_highgui.dir/src/cap_ffmpeg.o
    
In file included from /home/chris/src/OpenCV-2.3.0/modules/highgui/src/cap_ffmpeg.cpp:45:0:
    
/home/foo/src/OpenCV-2.3.0/modules/highgui/src/cap_ffmpeg_impl.hpp:103:36: fatal error: libavformat/avformat.h: No such file or directory
    
compilation terminated.

    This file lives in /opt/linux64-debug/include/ffmpeg/libavformat/avformat.h. I tried pointing make at that with CMAKE_INCLUDE_DIRECTORY,PATH, CMAKE_PREFIX_PATH and CMAKE_LIBRARY_PATH. None of that worked. ( I always used the path /opt/linux64-debug/include/ffmpeg.)

    https://code.ros.org/trac/opencv/ticket/1020

  • Error:No such property : targetPlatform for class : com.android.build.gradle.managed.NdkConfig

    30 juillet 2016, par Alder

    I am trying to build FFMPEG into my JNI code with gradle in Android Studio. I have build FFMPEG as a .so file, in order to adapt different platform, I build it for different ABI(arm64-v8a, armeabi-v7a, mip, etc).Then I need to determine the ABI of the current build in the build.gradle file.

    Refer Experimental Plugin User Guide, my build.gradle look like this :

    apply plugin: 'com.android.model.native'    
    
model{
    
    repositories {
    
        prebuilt(PrebuiltLibraries){
    
            ffmpeg{
    
                headers.srcDir "src/main/jni/build/${targetPlatform.getName()}/include"
    
                binaries.withType(SharedLibraryBinary) {
    
                    sharedLibraryFile = file("src/main/jni/build/${targetPlatform.getName()}/libvflibrary.so")
    
                }
    
            }
    
        }
    
    }
    
    android {
    
        compileSdkVersion = 24
    
        buildToolsVersion = "23.0.3"
    

    
        defaultConfig {
    
            minSdkVersion.apiLevel = 15
    
            targetSdkVersion.apiLevel = 24
    
            versionCode = 1
    
            versionName = "1.0"
    
        }
    

    
        ndk{
    
            //platformVersion = 21
    
            moduleName = "library-jni"
    
            stl = 'gnustl_static'
    
            toolchain = "clang"
    
            abiFilters.addAll(['armeabi', 'armeabi-v7a', 'arm64-v8a', 'mips'])
    
            cppFlags.addAll(['-std=c++11', '-D__STDC_CONSTANT_MACROS'])
    
            ldLibs.addAll(['log', 'android', 'z', 'EGL', 'GLESv2'])
    
        }
    

    
        sources {
    
            main {
    
                jni {
    
                    source{
    
                        srcDirs 'src/main/jni'
    
                    }
    
                    dependencies {
    
                        library 'ffmpeg' linkage 'shared'
    
                    }
    
                }
    
            }
    
        }
    
    }
    
}

    I am getting an error :

    Error:No such property : targetPlatform for class :
    com.android.build.gradle.managed.NdkConfig.

    Does anyone have an idea on how I can solve this, please ?

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