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• reduce bitrate using ffmpeg

  21 mai 2017, par WantIt

  I have this command to run with ffmpeg to reduce bitrate.

  ffmpeg -y -i input.mp4 -b:v 1024k output_1024k.mp4

  where we want to take the input file and just reduced it’s bitrate (just 1024k). It works in the commandline.
  Now, I like to reduce bitrate via Java. I decided to use bytedeco/javacv FFmpegFrameGrabber and FFmpegFrameRecorder to perform the same function. Below is my code :

  FFmpegFrameGrabber grabber = new FFmpegFrameGrabber("input.mp4");
  
              grabber.start();
  
  
  
              FrameRecorder recorder = new FFmpegFrameRecorder("out.mp4", grabber.getAudioChannels());
  
              recorder.setSampleRate(256);
  
              recorder.start();
  
  
  
              Frame frame;
  
              while ((frame = grabber.grabFrame()) != null) {
  
                  recorder.record(frame);
  
              }
  
              recorder.stop();
  
              grabber.stop(); 

  but it is saying the following error :

  org.bytedeco.javacv.FrameRecorder$Exception: avcodec_open2() error -22: Could not open audio codec.
  
      at org.bytedeco.javacv.FFmpegFrameRecorder.startUnsafe(FFmpegFrameRecorder.java:732)
  
      at org.bytedeco.javacv.FFmpegFrameRecorder.start(FFmpegFrameRecorder.java:351)
  
      at com.goxhere.api.monte.resources.VideoResource.uploadFile(VideoResource.java:337)
  
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  
      at java.lang.reflect.Method.invoke(Method.java:498)
  
      at org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory.lambda$static$0(ResourceMethodInvocationHandlerFactory.java:74)
  
      at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144)
  
      at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161)
  
      at org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$TypeOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:247)
  
      at org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99)
  
      at org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:388)
  
      at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:346)
  
      at org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102)
  
      at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:337)
  
      at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
  
      at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
  
      at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
  
      at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
  
      at org.glassfish.jersey.internal.Errors.process(Errors.java:267)
  
      at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:280)
  
      at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:316)
  
      at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1084)
  
      at org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:418)
  
      at org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:372)
  
      at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:389)
  
      at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:342)
  
      at org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:229)
  
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
  
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
  
      at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
  
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
  
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
  
      at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
  
      at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
  
      at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
  
      at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
  
      at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
  
      at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
  
      at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
  
      at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
  
      at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
  
      at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
  
      at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
  
      at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
  
      at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
  
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
  
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
  
      at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
  
      at java.lang.Thread.run(Thread.java:748)

  Basically the error says I have problem with audio codec, but when I tried to run the ffmpeg commandline directly, it reduces the bitrate just fine. Are we missing some setup in javacode ? Thank you.

• How can you run an exe as with no window, in the background and being the most efficient use of resources ? [closed]

  18 mars 2013, par Covenant Spokane

  I don't understand the way the windows totally functions so forgive the novice question.

  I want to setup a server running a video processing peogram called FFMpeg. The server will be used at an time to run that command line program in as many instances that the server can handle. I don't want the server to have 100 command windows open while its processing. Can an exe be run as a process or service or something so that it runs without a window and is as efficient as possible.

• Android video conversion [on hold]

  28 octobre 2013, par Jeffrey Grima

  I am a student who is doing his bachelors degree thesis. I need to implement a mobile application to convert video files from one format to another and also using a mobile service to do the same thing and compare how long did it take to perform the same tests but with different approaches.

  After doing some research on how to implement the conversion on the mobile application I have only found FFMpeg. I would like to know if any of you guys have in mind like other video converting API`s for android or something that i should consider before submitting my proposal.