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• Insert Video Clip in another Video using ffmpeg

  22 avril 2014, par ZafarYousafi

  I want to insert a video clip in another video at specified position (after n seconds). I am thinking to slice the main video first and then concatenate the pieces again. But this solution is not looking promising to me as what if I have to insert the video clips at multiple locations in the main video ? Is there any better way of doing this in ffmpeg ?
  thanks

• How to downscale video using subprocess and then piping the data over to stdout and play using ffplay and save it as well

  2 avril 2021, par ZeroDay Fracture

  I am trying to use ffmpeg to downscale a video and pipe the stdout data to ffplay to play the new downsized video by piping it to ffplay on aws lambda.

  


  This is the command I have so far, but for some reason adding a scale option is not working.

  


  I am trying to run this command locally before I deploy it on python with subprocess command. I need the raw video to be able to save into database for streaming the data in realtime.

  


  %ffmpeg -i sample.mp4  -vf scale=240:-2 -f  mpegts -c:v copy -af aresample=async=1:first_pts=0 - | ffplay -

  


  adding the scale optioin for some reason is saving the video as the name scale=240 :-2 which does not make sense.

  


• Loading shared libraries with Gradle 2.2.1

  12 février 2015, par Gabriel Furstenheim

  I’m trying to use a shared library, libavcodec-56.so, in my Android app and I can’t find the way. I’m using Gradle 2.2.1 and Android Studio 1.0. What I have done so far is the following :

  -I built libavcodec-56.so from source code using a NDK toolchain.

  -I copied libavcodec-56.so into src/main/jniLibs/armeabi

  -I’m able to create a .c file in the project and communicate with the java files using private native void nameOfTheNativeMethod()

  -I can load some external libraries like ldLibs "m"

  However, if I try to use #include <libavcodec></libavcodec>avcodec.h> I get the error

  No such file or directory
  
       #include <libavcodec></libavcodec>avcodec.h>

  My gradle file looks like :

  apply plugin: 'com.android.library'
  
  
  
  android {
  
      compileSdkVersion 21
  
      buildToolsVersion "21.1.2"
  
  
  
      defaultConfig {
  
          minSdkVersion 15
  
          targetSdkVersion 21
  
          versionCode 1
  
          versionName "1.0"
  
          ndk {
  
              moduleName "ffmpeg"
  
              cFlags "-std=c99"   
  
              ldLibs "log",  "m" 
  
          }
  
      }
  
  
  
      sourceSets.main {
  
          jni.srcDirs = ["src/main/jni"];
  
          //jniLibs.srcDirs = ['src/main/jniLibs'];
  
      }
  
  
  
  
  
      buildTypes {
  
          release {
  
              minifyEnabled false
  
              proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
  
          }
  
      }
  
  }
  
  
  
  dependencies {
  
      compile fileTree(dir: 'libs', include: ['*.jar'])
  
      compile 'com.android.support:appcompat-v7:21.0.3'
  
  
  
  }

  Any ideas ?

  Thanks in advance