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  • Java.lang.NoClassDefFoundError caused by FFmpeg when deployed on Linux as a packaged .war (Works on development machine)

    27 décembre 2016, par Jake Miller

    I use an FFmpeg wrapper to create thumbnails for videos uploaded by users. This works perfectly fine when testing on my development machine. However, whenever I package my project as a .war and deploy to Amazon Web Services, I get the following stack trace :

    Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.bytedeco.javacpp.avutil
    
    at java.lang.Class.forName0(Native Method) ~[na:1.8.0_101]
    
    at java.lang.Class.forName(Class.java:348) ~[na:1.8.0_101]
    
    at org.bytedeco.javacpp.Loader.load(Loader.java:472) ~[javacpp-1.2.1.jar!/:1.2.1]
    
    at org.bytedeco.javacpp.Loader.load(Loader.java:417) ~[javacpp-1.2.1.jar!/:1.2.1]
    
    at org.bytedeco.javacpp.avformat$AVFormatContext.<clinit>(avformat.java:2597) ~[ffmpeg-2.8.1-1.1.jar!/:1.2.1]
    
    at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:391) ~[javacv-1.2.jar!/:1.2]
    
    at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:385) ~[javacv-1.2.jar!/:1.2]
    
    at com.myapp.app.service.ICampaignService.createThumbnail(ICampaignService.java:425) ~[classes!/:0.0.44T-SNAPSHOT]
    
    at com.myapp.app.service.ICampaignService$$FastClassBySpringCGLIB$$47736265.invoke(<generated>) ~[classes!/:0.0.44T-SNAPSHOT]
    
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:720) ~[spring-aop-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) ~[spring-aop-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) ~[spring-tx-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:280) ~[spring-tx-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) ~[spring-tx-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) ~[spring-aop-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:655) ~[spring-aop-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at com.myapp.app.service.ICampaignService$$EnhancerBySpringCGLIB$$67e59894.createThumbnail(<generated>) ~[classes!/:0.0.44T-SNAPSHOT]
    
    at com.myapp.app.controllers.CampaignController.uploadCampaign(CampaignController.java:237) ~[classes!/:0.0.44T-SNAPSHOT]
    
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_101]
    
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_101]
    
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_101]
    
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_101]
    
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) ~[spring-web-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:114) ~[spring-webmvc-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) ~[spring-webmvc-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
    
    ... 85 common frames omitted
    
</generated></generated></clinit>

    Here’s my maven dependencies for the FFmpeg wrapper :

    <dependency>
    
    <groupid>org.bytedeco</groupid>
    
    <artifactid>javacv</artifactid>
    
    <version>1.3</version>
    
</dependency>
    
<dependency>
    
    <groupid>org.bytedeco</groupid>
    
    <artifactid>javacpp</artifactid>
    
    <version>1.3</version>
    
</dependency>
    
<dependency>
    
    <groupid>org.bytedeco.javacpp-presets</groupid>
    
    <artifactid>ffmpeg</artifactid>
    
    <version>3.2.1-1.3</version>
    
</dependency>
    
<dependency>
    
    <groupid>org.bytedeco.javacpp-presets</groupid>
    
    <artifactid>opencv-platform</artifactid>
    
    <version>3.1.0-1.3</version>
    
</dependency>

    Again, this library works perfectly fine on my development machine.

    • Development machine : Windows 10, 64-bit (Works)

    • AWS instance:64bit Amazon Linux 2016.09 v2.2.0 running Java 8 (Causes the issue above)

    I’ve spent around 7 hours trying to fix the issue by messing around with versions. Any idea how to solve this issue ?

    EDIT

    Dependency Tree :

    [INFO] +- org.springframework.boot:spring-boot-starter-data-jpa:jar:1.4.0.RELEASE:compile
    
[INFO] |  +- org.springframework.boot:spring-boot-starter:jar:1.4.0.RELEASE:compile
    
[INFO] |  |  +- org.springframework.boot:spring-boot:jar:1.4.0.RELEASE:compile
    
[INFO] |  |  +- org.springframework.boot:spring-boot-autoconfigure:jar:1.4.0.RELEASE:compile
    
[INFO] |  |  +- org.springframework.boot:spring-boot-starter-logging:jar:1.4.0.RELEASE:compile
    
[INFO] |  |  |  +- ch.qos.logback:logback-classic:jar:1.1.7:compile
    
[INFO] |  |  |  |  \- ch.qos.logback:logback-core:jar:1.1.7:compile
    
[INFO] |  |  |  +- org.slf4j:jul-to-slf4j:jar:1.7.21:compile
    
[INFO] |  |  |  \- org.slf4j:log4j-over-slf4j:jar:1.7.21:compile
    
[INFO] |  |  \- org.yaml:snakeyaml:jar:1.17:runtime
    
[INFO] |  +- org.springframework.boot:spring-boot-starter-aop:jar:1.4.0.RELEASE:compile
    
[INFO] |  |  \- org.aspectj:aspectjweaver:jar:1.8.9:compile
    
[INFO] |  +- org.springframework.boot:spring-boot-starter-jdbc:jar:1.4.0.RELEASE:compile
    
[INFO] |  |  +- org.apache.tomcat:tomcat-jdbc:jar:8.5.4:compile
    
[INFO] |  |  |  \- org.apache.tomcat:tomcat-juli:jar:8.5.4:compile
    
[INFO] |  |  \- org.springframework:spring-jdbc:jar:4.3.2.RELEASE:compile
    
[INFO] |  +- org.hibernate:hibernate-core:jar:5.0.9.Final:compile
    
[INFO] |  |  +- org.jboss.logging:jboss-logging:jar:3.3.0.Final:compile
    
[INFO] |  |  +- org.hibernate.javax.persistence:hibernate-jpa-2.1-api:jar:1.0.0.Final:compile
    
[INFO] |  |  +- org.javassist:javassist:jar:3.20.0-GA:compile
    
[INFO] |  |  +- antlr:antlr:jar:2.7.7:compile
    
[INFO] |  |  +- org.jboss:jandex:jar:2.0.0.Final:compile
    
[INFO] |  |  +- dom4j:dom4j:jar:1.6.1:compile
    
[INFO] |  |  |  \- xml-apis:xml-apis:jar:1.4.01:compile
    
[INFO] |  |  \- org.hibernate.common:hibernate-commons-annotations:jar:5.0.1.Final:compile
    
[INFO] |  +- org.hibernate:hibernate-entitymanager:jar:5.0.9.Final:compile
    
[INFO] |  +- javax.transaction:javax.transaction-api:jar:1.2:compile
    
[INFO] |  +- org.springframework.data:spring-data-jpa:jar:1.10.2.RELEASE:compile
    
[INFO] |  |  +- org.springframework.data:spring-data-commons:jar:1.12.2.RELEASE:compile
    
[INFO] |  |  +- org.springframework:spring-orm:jar:4.3.2.RELEASE:compile
    
[INFO] |  |  +- org.springframework:spring-tx:jar:4.3.2.RELEASE:compile
    
[INFO] |  |  \- org.slf4j:jcl-over-slf4j:jar:1.7.21:compile
    
[INFO] |  \- org.springframework:spring-aspects:jar:4.3.2.RELEASE:compile
    
[INFO] +- org.springframework.boot:spring-boot-starter-security:jar:1.4.0.RELEASE:compile
    
[INFO] |  +- org.springframework:spring-aop:jar:4.3.2.RELEASE:compile
    
[INFO] |  +- org.springframework.security:spring-security-config:jar:4.1.1.RELEASE:compile
    
[INFO] |  \- org.springframework.security:spring-security-web:jar:4.1.1.RELEASE:compile
    
[INFO] |     \- org.springframework:spring-expression:jar:4.3.2.RELEASE:compile
    
[INFO] +- org.springframework.boot:spring-boot-starter-web:jar:1.4.0.RELEASE:compile
    
[INFO] |  +- org.springframework.boot:spring-boot-starter-tomcat:jar:1.4.0.RELEASE:compile
    
[INFO] |  |  +- org.apache.tomcat.embed:tomcat-embed-core:jar:8.5.4:compile
    
[INFO] |  |  +- org.apache.tomcat.embed:tomcat-embed-el:jar:8.5.4:compile
    
[INFO] |  |  \- org.apache.tomcat.embed:tomcat-embed-websocket:jar:8.5.4:compile
    
[INFO] |  +- org.hibernate:hibernate-validator:jar:5.2.4.Final:compile
    
[INFO] |  |  +- javax.validation:validation-api:jar:1.1.0.Final:compile
    
[INFO] |  |  \- com.fasterxml:classmate:jar:1.3.1:compile
    
[INFO] |  +- com.fasterxml.jackson.core:jackson-databind:jar:2.8.1:compile
    
[INFO] |  |  +- com.fasterxml.jackson.core:jackson-annotations:jar:2.8.1:compile
    
[INFO] |  |  \- com.fasterxml.jackson.core:jackson-core:jar:2.8.1:compile
    
[INFO] |  +- org.springframework:spring-web:jar:4.3.2.RELEASE:compile
    
[INFO] |  \- org.springframework:spring-webmvc:jar:4.3.2.RELEASE:compile
    
[INFO] +- org.springframework.boot:spring-boot-starter-test:jar:1.4.0.RELEASE:test
    
[INFO] |  +- org.springframework.boot:spring-boot-test:jar:1.4.0.RELEASE:test
    
[INFO] |  +- org.springframework.boot:spring-boot-test-autoconfigure:jar:1.4.0.RELEASE:test
    
[INFO] |  +- com.jayway.jsonpath:json-path:jar:2.2.0:test
    
[INFO] |  |  \- net.minidev:json-smart:jar:2.2.1:test
    
[INFO] |  |     \- net.minidev:accessors-smart:jar:1.1:test
    
[INFO] |  |        \- org.ow2.asm:asm:jar:5.0.3:test
    
[INFO] |  +- junit:junit:jar:4.12:test
    
[INFO] |  +- org.assertj:assertj-core:jar:2.5.0:test
    
[INFO] |  +- org.mockito:mockito-core:jar:1.10.19:test
    
[INFO] |  |  \- org.objenesis:objenesis:jar:2.1:test
    
[INFO] |  +- org.hamcrest:hamcrest-core:jar:1.3:test
    
[INFO] |  +- org.hamcrest:hamcrest-library:jar:1.3:test
    
[INFO] |  +- org.skyscreamer:jsonassert:jar:1.3.0:test
    
[INFO] |  |  \- org.json:json:jar:20140107:test
    
[INFO] |  +- org.springframework:spring-core:jar:4.3.2.RELEASE:compile
    
[INFO] |  \- org.springframework:spring-test:jar:4.3.2.RELEASE:test
    
[INFO] +- org.springframework.security.oauth:spring-security-oauth2:jar:2.0.10.RELEASE:compile
    
[INFO] |  +- org.springframework:spring-beans:jar:4.3.2.RELEASE:compile
    
[INFO] |  +- org.springframework:spring-context:jar:4.3.2.RELEASE:compile
    
[INFO] |  +- org.springframework.security:spring-security-core:jar:4.1.1.RELEASE:compile
    
[INFO] |  |  \- aopalliance:aopalliance:jar:1.0:compile
    
[INFO] |  +- commons-codec:commons-codec:jar:1.10:compile
    
[INFO] |  \- org.codehaus.jackson:jackson-mapper-asl:jar:1.9.13:compile
    
[INFO] |     \- org.codehaus.jackson:jackson-core-asl:jar:1.9.13:compile
    
[INFO] +- org.springframework.security:spring-security-jwt:jar:1.0.4.RELEASE:compile
    
[INFO] |  \- org.bouncycastle:bcpkix-jdk15on:jar:1.47:compile
    
[INFO] |     \- org.bouncycastle:bcprov-jdk15on:jar:1.47:compile
    
[INFO] +- mysql:mysql-connector-java:jar:5.1.39:compile
    
[INFO] +- commons-io:commons-io:jar:2.5:compile
    
[INFO] +- org.apache.commons:commons-lang3:jar:3.0:compile
    
[INFO] +- org.bytedeco:javacv:jar:1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:opencv:jar:3.1.0-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:flycapture:jar:2.9.3.43-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:libdc1394:jar:2.2.4-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:libfreenect:jar:0.5.3-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:librealsense:jar:1.9.6-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:videoinput:jar:0.200-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:artoolkitplus:jar:2.3.1-1.3:compile
    
[INFO] |  \- org.bytedeco.javacpp-presets:flandmark:jar:1.07-1.3:compile
    
[INFO] +- org.bytedeco:javacpp:jar:1.3:compile
    
[INFO] +- org.bytedeco.javacpp-presets:ffmpeg:jar:3.2.1-1.3:compile
    
[INFO] +- org.bytedeco.javacpp-presets:opencv-platform:jar:3.1.0-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:opencv:jar:android-arm:3.1.0-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:opencv:jar:android-x86:3.1.0-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:opencv:jar:linux-x86:3.1.0-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:opencv:jar:linux-x86_64:3.1.0-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:opencv:jar:linux-armhf:3.1.0-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:opencv:jar:linux-ppc64le:3.1.0-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:opencv:jar:macosx-x86_64:3.1.0-1.3:compile
    
[INFO] |  +- org.bytedeco.javacpp-presets:opencv:jar:windows-x86:3.1.0-1.3:compile
    
[INFO] |  \- org.bytedeco.javacpp-presets:opencv:jar:windows-x86_64:3.1.0-1.3:compile
    
[INFO] +- com.paypal.sdk:rest-api-sdk:jar:1.13.0:compile
    
[INFO] |  +- org.slf4j:slf4j-api:jar:1.7.21:compile
    
[INFO] |  \- com.google.code.gson:gson:jar:2.7:compile
    
[INFO] +- com.squareup.okhttp3:okhttp:jar:3.4.1:compile
    
[INFO] |  \- com.squareup.okio:okio:jar:1.9.0:compile
    
[INFO] +- javax.mail:mail:jar:1.4:compile
    
[INFO] |  \- javax.activation:activation:jar:1.1:compile
    
[INFO] \- com.amazonaws:aws-java-sdk:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-support:jar:1.11.58:compile
    
[INFO]    |  \- com.amazonaws:jmespath-java:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-simpledb:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-servicecatalog:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-servermigration:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-simpleworkflow:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-storagegateway:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-route53:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-s3:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-importexport:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-sts:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-sqs:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-rds:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-redshift:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-elasticbeanstalk:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-glacier:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-iam:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-datapipeline:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-elasticloadbalancing:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-elasticloadbalancingv2:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-emr:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-elasticache:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-elastictranscoder:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-ec2:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-dynamodb:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-sns:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-budgets:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-cloudtrail:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-cloudwatch:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-logs:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-events:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-cognitoidentity:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-cognitosync:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-directconnect:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-cloudformation:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-cloudfront:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-kinesis:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-opsworks:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-ses:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-autoscaling:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-cloudsearch:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-cloudwatchmetrics:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-codedeploy:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-codepipeline:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-kms:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-config:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-lambda:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-ecs:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-ecr:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-cloudhsm:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-ssm:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-workspaces:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-machinelearning:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-directory:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-efs:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-codecommit:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-devicefarm:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-elasticsearch:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-waf:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-marketplacecommerceanalytics:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-inspector:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-iot:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-api-gateway:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-acm:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-gamelift:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-dms:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-marketplacemeteringservice:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-cognitoidp:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-discovery:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-applicationautoscaling:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-snowball:jar:1.11.58:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-core:jar:1.11.58:compile
    
[INFO]    |  +- commons-logging:commons-logging:jar:1.1.3:compile
    
[INFO]    |  +- org.apache.httpcomponents:httpclient:jar:4.5.2:compile
    
[INFO]    |  |  \- org.apache.httpcomponents:httpcore:jar:4.4.5:compile
    
[INFO]    |  +- software.amazon.ion:ion-java:jar:1.0.1:compile
    
[INFO]    |  +- com.fasterxml.jackson.dataformat:jackson-dataformat-cbor:jar:2.8.1:compile
    
[INFO]    |  \- joda-time:joda-time:jar:2.9.4:compile
    
[INFO]    +- com.amazonaws:aws-java-sdk-models:jar:1.11.58:compile
    
[INFO]    \- com.amazonaws:aws-java-sdk-swf-libraries:jar:1.11.22:compile

    Error after upgrading Linux to 2.4, downgrading javacpp to 1.2.1, and running mvn clean :

    java.lang.NoClassDefFoundError: Could not initialize class org.bytedeco.javacpp.avutil
    
    at java.lang.Class.forName0(Native Method) ~[na:1.8.0_111]
    
    at java.lang.Class.forName(Class.java:348) ~[na:1.8.0_111]
    
    at org.bytedeco.javacpp.Loader.load(Loader.java:472) ~[javacpp-1.2.1.jar!/:1.2.1]
    
    at org.bytedeco.javacpp.Loader.load(Loader.java:417) ~[javacpp-1.2.1.jar!/:1.2.1]
    
    at org.bytedeco.javacpp.avformat$AVFormatContext.<clinit>(avformat.java:2819) ~[ffmpeg-3.2.1-1.3.jar!/:1.2.1]
    
    at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:391) ~[javacv-1.3.jar!/:1.3]
    
    at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:385) ~[javacv-1.3.jar!/:1.3]
    
</clinit>

    WHAT I’VE TRIED SO FAR

    • upgrade to Linux to 2.4
    • downgrading javacpp to 1.2.1
    • running mvn clean
    • running mvn -U
    • deleting contents of /.m2/ and redownloading dependencies
    • various combinations of dependency versions
    • git clone on a Linux VM & running mvn install there

  • Installation of opencv and ffmpeg on anaconda

    17 mars 2017, par user564650

    I am using an amazon EC2 instance and working on a deep learning problem. I want to install opencv along with ffmpeg on anaconda python in order to process the video frames. Can somebody please help out with the installation ?

  • Why does my Blink based browser play hide and seek ?

    21 janvier 2016, par Caius Jard

    We have a C# tool (that I wrote) that records online broadcasts taking place a custom written (that we wrote) flash app. (There are no DRM or copyright issues here.)

    We’ve coded up a system whereby this tool is installed on a Windows Server 2012 R2 Amazon AWS instance. After we boot the instance, the tool loads, waits for the right time to start recording, launches a browser and passes the command line argument of the URL to access the broadcast. The browser will then load the flash app and the interview audio and video will start arriving at the browser instance on AWS

    By way of a virtual audio cable driver, screen / audio capture directshow filters and ffmpeg a screen recording is taken. The C# tool calls ffmpeg and ffmpeg will record the screen reliably for the entire interview, then the tool shuts the whole thing down

    The problem I’m having is that both Chrome and Electron browser sometimes simply don’t draw themselves on the screen so all ffmpeg ends up recording is a blank desktop and the audio of the broadcast (hence, the browser IS running)

    We found this out when recordings started turning up with X hours of merely recording the windows desktop and the tool’s main window with a countdown timer.

    A screenshotting facility was built into the tool and added to its web control interface, and this way we can test whether the browser is visible - a human looks at the screenshot of every broadcast, just after recording has started (the browser is supposed to be on show by this time)

    We notice that 50% of the time, the browser isn’t drawing itself on screen. By 50% I mean that every other recording that the AWS instance carries out, will be blank : AWS starts, records ok, shuts down. AWS starts again an hour later for a different broadcast, recording is blank, shuts down.. Starts/ok/shutdown. Starts/blank/shutdown. Repeat ad infinitum

    What’s even more strange is that if I run VNCviewer on my dev machine and connect up to an instance that is having a problem, the instant that the VNC connection is up and the remote desktop is showing on my screen, the browser suddenly appears as if nothing was ever wrong. A screenshot from before the VNC connect shows blank desktop, connect VNC, take another screenshot and the browser is there. All through it the audio is fine - the browser connected to the boadcast is fine, for sure

    It’s as though Chrome/Electron thinks "you know what, noone is looking at me so I’m not going to bother drawing myself". No screen saver is set, though the power plan has the setting "turn off the display after 15 minutes".

    Perhaps Chrome/Electron have a test amounts to "if the display is off, don’t draw". I can’t explain the inconsistency though - the recorder launches at least 1 hour before it’s needed, and sits there idle until it’s time to start the browser. You’d hence imagine that the "power off the monitor after 15 mins" setting would reliably have ensured the "monitor" is "off" by the time every recording start comes around

    This behaviour doesn’t happen with any of the other browsers (but unfortunately the app doesn’t and cannot work in them because it uses some weird chrome-only technology/API).

    Can anyone suggest anything to look at to help debug this, or anything I can build into the C# tool to overcome the problem ? Coding it up to connect to itself via VNC for a few seconds after it has launched the browser.. Well that just tastes nasty.

    Naturally, as soon as I connect to the machine via VNC (rather than RDP - RDP isn’t usable because the recording context is in a logged on session for a particular user) the problem goes away, which makes it frustratingly hard to debug.

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