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• Streaming without Content-Length in response

  29 août 2011, par kain

  I'm using Node.js, Express (and connect), and fluent-ffmpeg.

  We want to stream audio files that are stored on Amazon S3 through http.

  We have all working, except that we would like to add a feature, the on-the-fly conversion of the stream through ffmpeg.

  This is working well, the problem is that some browsers checks in advance before actually getting the file.

  Incoming requests containing the Range header, for which we reply with a 206 with all the info from S3, have a fundamental problem : we need to know in advance the content-length of the file.

  We don't know that since it is going through ffmpeg.

  One solution might be to write out the resulting content-length directly on S3 when storing the file (in a special header), but this means we have to go through the pain of having queues to encode after upload just to know the size for future requests.
  It also means that if we change compressor or preset we have to go through all this over again, so it is not a viable solution.

  We also noticed big differencies in the way Chrome and Safari request the audio tag src, but this may be discussion for another topic.

  Fact is that without a proper content-length header in response everything seems to break or browsers goes in an infinite loop or restart the stream at pleasure.

  Ideas ?

• Android App Bundle build error : File 'root/lib/x86/ffmpeg' uses directory name 'lib'

  7 septembre 2020, par Patel Pinkal

  I have used FFmpeg Android in the project from this repo FFmpeg-Android-Java and implement only the FFmpegAndroid module in the project.

  


  FFmpeg library is working fine when we run directly from Android Studio or we make APK file (debug or Signed).

  


  But When I try to generate the app bundle from Android studio I get the below error.

  


  Execution failed for task ':app:packageReleaseBundle'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade
  > File 'root/lib/x86/ffmpeg' uses reserved file or directory name 'lib'.


  


  


  Project Level build.gradle

  


  


   // Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

// Different version declaration
ext {
    kotlin_version = '1.4.0'
    supportVersion = "28.0.0"
    retrofitVersion = "2.0.2"
    okhttp3Version = "3.2.0"
    smackVersion = "4.3.0"
    nav_version = "2.1.0-alpha02"
}

repositories {
    google()
    jcenter()
    maven { url "https://jitpack.io" }
    maven { url 'https://maven.fabric.io/public' }
    mavenCentral()
}
dependencies {
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    classpath 'com.google.gms:google-services:4.3.3'
    classpath 'com.android.tools.build:gradle:4.0.1'
    classpath 'io.fabric.tools:gradle:1.28.1'
    classpath 'me.tatarka:gradle-retrolambda:3.3.1'
    classpath 'com.jakewharton:butterknife-gradle-plugin:9.0.0-rc2'
    classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.7.3'
    classpath "com.github.dcendents:android-maven-gradle-plugin:2.0"
    classpath 'com.google.firebase:perf-plugin:1.3.1'
}
}

 allprojects {
     repositories {
         google()
         jcenter()
         maven { url "https://jitpack.io" }
         maven { url 'https://maven.fabric.io/public' }
         mavenCentral()
     }
 }

 task clean(type: Delete) {
     delete rootProject.buildDir
 }


  


  


  


• What does "probe_score" means from ffprobe output ?

  13 août 2014, par Drake

  Given a media file, after running ffprobe -i input.mp4 -show_format -print_format json, I got something like this :

  {
  
      "format": {
  
          "filename": "ooxx.mp4",
  
          "nb_streams": 2,
  
          "nb_programs": 0,
  
          "format_name": "mov,mp4,m4a,3gp,3g2,mj2",
  
          "format_long_name": "QuickTime / MOV",
  
          "start_time": "0.000000",
  
          "duration": "231.210000",
  
          "size": "65133325",
  
          "bit_rate": "2253650",
  
          "probe_score": 100,
  
          "tags": {
  
              "major_brand": "isom",
  
              "minor_version": "512",
  
              "compatible_brands": "isomiso2avc1mp41",
  
              "encoder": "Lavf55.33.100",
  
          }
  
      }
  
  }

  I’m wondering what does probe_score mean here ? How does it get calculated ?