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• What does "dash" - mean as ffmpeg output filename

  26 août 2020, par DDS

  I'm trying to use ffmpeg with gnuplot to draw some audio spectra, I'm following this ffmpeg doc link.

  


  Now I'm asking what "dash" - means on this line right after -f data, it should be a filename : the last element of ffmpeg command should the output file but I have no files named - in the directory after running the command.

  


  ffmpeg -y -i in.wav -ac 1 -filter:a aresample=8000 -map 0:a -c:a pcm_s16le -f data - | gnuplot -p -e "plot 'code>

  


  I looked on ffmpeg docs but I didn't find anything.

  


• Command build failed ndk

  1er janvier 2021, par ALI RAZA

  I want to integrate ffmpeg lib in my android app . So i am using ndk ,but i am stuck on this issue,I dont know why the error is appearing ,Thanks in advance ;

  


  It is the gradle code that i am using in my app and also the ffmpeg-android-maker path is provided

  


  plugins {
id 'com.android.application'


  


  


  android 
compileSdkVersion 30
buildToolsVersion "30.0.3"

  


  defaultConfig {
    applicationId "com.reactive.myapplication"
    minSdkVersion 16
    targetSdkVersion 30
    versionCode 1
    versionName "1.0"

    testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    externalNativeBuild {
        cmake {
            cppFlags ""
        }
    }
}
flavorDimensions "market"
productFlavors {
    google {
        dimension "market"
        ndk {
            // Since the App Bundle is used, there is no problem in packaging all these ABIs
            abiFilters 'x86', 'x86_64', 'armeabi-v7a', 'arm64-v8a'
        }
    }
    amazon {
        dimension "market"
        applicationIdSuffix ".amzn"
        ndk {
            // Amazon Appstore doesn't support multiple APKs for non-Amazon devices.
            // There is no point in x86 support here, as the majority of devices with the
            // Amazon Appstore are ARM-based. And it seems to be a common practice for other
            // apps in this market.
            abiFilters 'armeabi-v7a'
        }
    }
    huawei {
        dimension "market"
        applicationIdSuffix ".huawei"
        ndk {
            // Huawei App Gallery supports App Bundle format
            abiFilters 'x86', 'x86_64', 'armeabi-v7a', 'arm64-v8a'
        }
    }
}
sourceSets {
    main {
        // let gradle pack the shared library into the apk
        jniLibs.srcDirs = ['../ffmpeg-android-maker/output/lib']
    }
}

bundle {
    language {
        enableSplit = true
    }
    density {
        enableSplit = true
    }
    abi {
        enableSplit = true
    }
}

buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
}
externalNativeBuild {
    cmake {
        path "src/main/cpp/CMakeLists.txt"
        version "3.10.2"
    }
}
compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8

    targetCompatibility JavaVersion.VERSION_1_8
}


  


  


  dependencies

  


  implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'com.google.android.material:material:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
testImplementation 'junit:junit:4.+'
androidTestImplementation 'androidx.test.ext:junit:1.1.1'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'


  


  


  And It is cmake ,


  


  And this is error i am facing :
Build command failed.
Error while executing process /home/ali/Android/Sdk/cmake/3.10.2.4988404/bin/ninja with arguments -C /home/ali/AndroidStudioProjects/FfmpegApp/app/.cxx/cmake/amazonDebug/armeabi-v7a native-lib
ninja : Entering directory `/home/ali/AndroidStudioProjects/FfmpegApp/app/.cxx/cmake/amazonDebug/armeabi-v7a'

  


  ninja : error : '/home/ali/AndroidStudioProjects/FfmpegApp/app/src/main/ffmpeg-android-maker/output/lib/armeabi-v7a/libavutil.so', needed by '/home/ali/AndroidStudioProjects/FfmpegApp/app/build/intermediates/cmake/amazonDebug/obj/armeabi-v7a/libnative-lib.so', missing and no known rule to make it

  


• ffmpeg extract multiple frames from single input

  10 octobre 2023, par Andrew Still

  I'm trying to dynamically extract multiple different frames from single video input. So the command I'm calling looking like this

  


  ffmpeg -loglevel debug -hide_banner -t 13.269541 -y -ss 0 -i "input-s3-url" -ss 13.269541 -i "same-input-s3-url" -map 0:v -vframes 1 /tmp/ca4cd7a3159743938c5362c171ea2cae.0.png -map 1:v -vframes 1 /tmp/ca4cd7a3159743938c5362c171ea2cae.13.269541.png


  


  It works and everything is good, until I deploy it to lambda. Even though I'm using 10gb of RAM it still failing with error. Locally it works like a charm but not on lambda. I'm not sure what the problem here but i'm regularly (not always) getting SIGSEGV

  


  

  


  Double-checked memory usage and it's doesn't look like a reason, but I'm not sure how correct this number

  


  

  


  I'm think maybe it's because it's making requests for each input, at least that's what I saw in debug mode, but still have no idea what's the problem here, would appreciate any suggestions/optimizations/help. Thanks

  


  ffmpeg added on lambda using this layer - https://serverlessrepo.aws.amazon.com/applications/us-east-1/145266761615/ffmpeg-lambda-layer