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• FFmpeg is using more threads than I expect when using -threads

  7 décembre 2016, par Tom Peters

  The number of actual threads used by FFmpeg do not line up with the number I pass using the -threads argument.

  I’ve run tests on both my MacBook Air, which has 4 cores, and a VM I have which has 2 cores. The number of threads used are consistent across both machines.

  Using a single thread returns what I would expect : 1 thread is used.

  $ ffmpeg -threads 1 -i clip.mp4 -threads 1 -acodec libfdk_aac -vcodec libx264 -b:v 200k -vf scale=200:-2 -y clip-200.mp4
  
  
  
  $ cat /proc/$(pgrep ffmpeg)/status | grep Threads
  
  Threads:        1

  If I set the -threads option on the input, it increase the number of threads used to 3. This somewhat makes sense to me since the input would use 2 threads and the output would use a single thread.

  $ ffmpeg -threads 2 -i clip.mp4 -threads 1 -acodec libfdk_aac -vcodec libx264 -b:v 200k -vf scale=200:-2 -y clip-200.mp4
  
  
  
  $ cat /proc/$(pgrep ffmpeg)/status | grep Threads
  
  Threads:        3

  This is where I start to get confused. If instead, I leave the input -threads at 1 and set the output -threads to 2, it uses 8 threads (not 3 like I would expect).

  $ ffmpeg -threads 1 -i clip.mp4 -threads 2 -acodec libfdk_aac -vcodec libx264 -b:v 200k -vf scale=200:-2 -y clip-200.mp4
  
  
  
  cat /proc/$(pgrep ffmpeg)/status | grep Threads
  
  Threads:        8

  If I add a second output with -threads 1, it does not increase the number of threads used.

  $ ffmpeg -threads 1 -i clip.mp4 -threads 2 -acodec libfdk_aac -vcodec libx264 -b:v 200k -vf scale=200:-2 -y clip-200.mp4 \
  
                                  -threads 1 -acodec libfdk_aac -vcodec libx264 -b:v 250k -vf scale=250:-2 -y clip-250.mp4
  
  
  
  cat /proc/$(pgrep ffmpeg)/status | grep Threads
  
  Threads:        8

  However, if the second output also specifies two threads, the thread count jumps to 15.

  $ ffmpeg -threads 1 -i clip.mp4 -threads 2 -acodec libfdk_aac -vcodec libx264 -b:v 200k -vf scale=200:-2 -y clip-200.mp4 \
  
                                  -threads 2 -acodec libfdk_aac -vcodec libx264 -b:v 250k -vf scale=250:-2 -y clip-250.mp4
  
  
  
  cat /proc/$(pgrep ffmpeg)/status | grep Threads
  
  Threads:        15

  Every incremental bump beyond -threads 2 will use an additional 3 threads (e.g. threads 2 uses 8, threads 3 uses 11, threads 4 uses 14.

  So it seems like anytime you use -threads 2 the formula is something like :

  1 + [ (1 + (3 * output_n_threads)) + ... ]

  Ultimately my question is why do the number of actual threads used wildly differ from the options I’m specifying.

  Thanks.

• using ffmpeg from macOS terminal for uploading youtube short from android just do nothing

  25 juin 2023, par Yogi Arif Widodo

  my component / recording is using blachole plugin on macOS.

  


  engine : 13" Macbook Pro M1 ( macOS 13.2 / Ventura )

  


  step to reproduce

  


  

  1. my output is screenRecordingAudio ( this name is custom name ).

  


  


  // screenRecordingAudio in audioMidi : 
BlackHole 16ch [mark as checked on use]
External Headphones [mark as checked on use]


  


  


  screenRecordingAudio is using on by click on right top of bar UI, click sound, click screenRecordingAudio.

  


  


  OR

  


  


  screenRecordingAudio is using on Settings ➡️ Sounds ➡️ Output ➡️ then choose screenRecordingAudio

  


  


  

  2. my input is quickTimeInput ( this name is custom name ).

  


  


  // quickTimeInput in audioMidi : 
BlackHole 16ch [mark as checked on use]


  


  

  3. then using ⌘ + shift + 5 , on option i use quickTimeInput

  


  4. i use these command to convert into mp4 and also purpose to get more small size video

  


  


  #!/bin/bash

# greet the user
function yoVideo() {
  ffmpeg -i $1.mov -c:v libx264 -preset medium -crf 23 -c:a aac -b:a 128k -movflags +faststart $1.mp4
}


  


  OR

  


  ffmpeg -i yogiarifwidodo.mov -c:v libx264 -preset medium -crf 23 -c:a aac -b:a 128k -movflags +faststart yogiarifwidodo.mp4


  


  

  5. then i move the video into my phone android.

  


  6. then when i tried to upload on youtube as short, its cannot be process to upload ( its just do nothing ) but when i upload on facebook reels its work also on instagram story its still working also for whatsapp story.

  


  


  when i didnt convert into mp4 its also happend and in any other case for example whatsapp story , its lagging to review video before upload . its happend to on instagram .
but when i force upload , the result video is good and smooth . then i re download my video its still best video and when try to upload my download video , there is no lagging in any condition.

  


  how to get ffmpeg perform into mp4 and also no lagging on editing while uploading at whatsapp story or instagram story or facebook , etc ?
by the way i dont know command ffmpeg , the code is copied from stackoverflow and i forgot where is it.

  


• RN 0.74.7 can't find repo for ffmpeg-kit-react-native 6.0.2

  9 mai, par user938363

  My React Native 0.74.7 (on MacOS) app has hard time to find the ffmpeg-kit-react-native repo when run-android. It constantly complains no repo found on maven. Here is the error when react-native run-android :

  


  * What went wrong:
Could not determine the dependencies of task ':app:processDebugResources'.
> Could not resolve all task dependencies for configuration ':app:debugRuntimeClasspath'.
   > Could not find com.arthenica:ffmpeg-kit-full-gpl:6.0.
     Searched in the following locations:
       - https://oss.sonatype.org/content/repositories/snapshots/com/arthenica/ffmpeg-kit-full-gpl/6.0/ffmpeg-kit-full-gpl-6.0.pom
       - https://repo.maven.apache.org/maven2/com/arthenica/ffmpeg-kit-full-gpl/6.0/ffmpeg-kit-full-gpl-6.0.pom
       - file:/Users/macbook/Documents/code/js/VmonFront/node_modules/jsc-android/dist/com/arthenica/ffmpeg-kit-full-gpl/6.0/ffmpeg-kit-full-gpl-6.0.pom
       - https://dl.google.com/dl/android/maven2/com/arthenica/ffmpeg-kit-full-gpl/6.0/ffmpeg-kit-full-gpl-6.0.pom
       - https://www.jitpack.io/com/arthenica/ffmpeg-kit-full-gpl/6.0/ffmpeg-kit-full-gpl-6.0.pom
     Required by:
         project :app > project :ffmpeg-kit-react-native


  


  In android/build.gradle, the repo was specified :

  


  buildscript {
    ext {
        buildToolsVersion = "34.0.0"
        minSdkVersion = 23
        compileSdkVersion = 34
        targetSdkVersion = 34
        ndkVersion = "26.1.10909125"
        kotlinVersion = "1.9.22"

        ffmpegKitPackage = "full-gpl"
    }

    repositories {
        google()
        mavenCentral()
        maven { url "https://jitpack.io" }
        // You can comment out the below line if it causes issues:
        maven { url 'https://maven.arthenica.com/public/' } //<<<===repo here
    }

    dependencies {
        classpath("com.android.tools.build:gradle")
        classpath("com.facebook.react:react-native-gradle-plugin")
        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin")
    }
}


apply plugin: "com.facebook.react.rootproject"


  


  Also the following code is added to android/app/build.gradle :

  


  // 🔥 Add this block to override the wrong version in ffmpeg's gradle.properties
configurations.all {
    resolutionStrategy {
        force "com.arthenica:ffmpeg-kit-https:6.0". //<<<===6.0.2 or 6 didn't work
        force "com.arthenica:ffmpeg-kit-full-gpl:6.0" // Include if using other packages
    }
}


  


  The problem seems to be with RN 0.74.7 only, as my RN 0.78.0 with ffmpeg-kit-react-native installed was able to download full-gpl version and installed successfully. What is missing here to install ffmpeg-kit on RN 0.74.7 ?