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• Android NDK - ffmpeg header files not found by compiler

  7 septembre 2015, par markt

  I am trying to use the ffmpeg libraries with Android NDK in the experimental plugin.

  I am attempting to compile this example :
  https://github.com/roman10/android-ffmpeg-tutorial/blob/master/android-ffmpeg-tutorial01/jni/tutorial01.c

  My problem is that the header files are not being found by the compiler :

  Error:(13, 32) libavcodec/avcodec.h: No such file or directory

  I added flags to build.grade :

  cppFlags += "-ilibavcodec -ilibavutil -ilibavformat -ilibswscale"
  
  ldFlags += "-llibavcodec -llibavutil -llibavformat -llibswscale"

  Which seems to keep lint happy, but not the compiler. (Not sure if I have done this right ?)

  I Have added the header files to the /jni folder :
  

  And build.grade looks like this :

  apply plugin: 'com.android.model.application'
  
  model {
  
      android {
  
          compileSdkVersion = 23
  
          buildToolsVersion = "23.0.1"
  
  
  
          defaultConfig.with { 
  
              applicationId = "roman10.tutorial.android_ffmpeg_tutorial01"
  
              minSdkVersion.apiLevel = 10
  
              targetSdkVersion.apiLevel = 23
  
  
  
          }
  
      }
  
  
  
      compileOptions.with {
  
          sourceCompatibility = JavaVersion.VERSION_1_7
  
          targetCompatibility = JavaVersion.VERSION_1_7
  
      }
  
  
  
      android.buildTypes {
  
          release {
  
              minifyEnabled = false
  
              proguardFiles += file('proguard-rules.pro')
  
          }
  
      }
  
  
  
  
  
      android.ndk {
  
          moduleName = "tutorial01"
  
          ldLibs += ["android","log","jnigraphics","z"]
  
          cppFlags += "-ilibavcodec -ilibavutil -ilibavformat -ilibswscale"
  
          ldFlags += "-llibavcodec -llibavutil -llibavformat -llibswscale"
  
      }
  
  }
  
  
  
  dependencies {
  
      compile fileTree(dir: 'libs', include: ['*.jar'])
  
      compile 'com.android.support:support-v4:23.0.1'
  
  }

  Thanks.

• Latency issue with CMU Sphinx 4

  22 septembre 2015, par vijaym

  I have written the speech recognition application using CMU sphinx 4 and followed the details from this link. I have defined the Acoustic,Dictionary and Language Model as below

  configuration.setAcousticModelPath("resource:/edu/cmu/sphinx/models/en-us/en-us");
  
  
  
  configuration.setDictionaryPath("resource:/edu/cmu/sphinx/models/en-us/cmudict-en-us.dict");
  
  
  
  configuration.setLanguageModelPath("resource:/edu/cmu/sphinx/models/en-us/en-us.lm.bin");

  With the above configuration the 20 minutes of wav file takes almost close to 20 minutes to do the transcription.Hence than I tried to pass the user defined config.xml. I did n’t find the configuration manager option to pass the user defined config.xml with the current version of Sphinx4.Then I had written own recognizer by extending the AbstractSpeechRecognizer.java class(It may be useless) and changed few parameters of config.xml and I tried it but still no improvement.

  I have downloaded video and audio across multiple source and converted into WAV file using FFMPEG

  The command is as below

  ffmpeg -i input.mp3 -acodec pcm_s16le -ac 1 -ar 16000 output.wav

  Environment Details :

  Java 8

  Ubuntu 14.04

  RAM 4GB

  I5 Processor

  What I would like to know is, what I am missing here and how to improve the performance ?

• Rails Thumbnails for videos being uploaded to S3

  20 octobre 2015, par Dani

  I have a rails application where I need to upload videos to an amazon s3 bucket alongwith their thumbnails. I am using ffmpeg to generate thumbnails and I am using carrierwave to handle video uploads. Here is my video uploader class

   class VideoUploader < CarrierWave::Uploader::Base
  
    include CarrierWave::Video
  
    storage :fog
  
    def store_dir
  
       "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  
    end
  
    def extension_white_list
  
      %w(mp4 flv)
  
    end
  
  end

  The video uploads fine and the column for video url is set in videos table but I want to generate thumbnail and upload it as well. I know I have to use ffmpeg here but don’t exactly know how to do it.

  Any help will be appreciated.