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• FFMPEG : how to extract every 2-nd I-frame from a video file

  30 novembre 2022, par tol

  I'm looking a way to extract every second (2nd) I-Frame using ffmpeg and save them as a new timelapse video.

  


  So far I managed to save all I-frames by the following command :

  


  ffmpeg -i $FILE -vf "select='eq(pict_type,I)',setpts=N/FRAME_RATE/TB" -r 29.97 -vcodec libx264 -b:v 62M -an ./enc/$FILE_cnv.mp4

  


  but I need twice less I-frames in the resulting video. For example, if the I-frames in the original video are 1-8-16-24-32-40..., I need only 1-16-32-48... Is there a way to extract them without making a temporary video with all keyframes ?

  


  Update : since no universal solution was found, I decided to cheat with :
-vf "select='eq(pict_type,I)*not(mod(n,16))',setpts=N/FRAME_RATE/TB"

  


• How to use FFSampledSP to play gsm file on MacOSX

  25 novembre 2014, par QuentinTanioartino

  I developed a Java8 application which retrieves audio files from a server and plays them back.

  Files are encoded in gsm 6.10.

  I am trying to find a solution to play these gsm files back and so far I attempted to play them back using Tritonus but unfortunately without any good result.

  Now I am trying to use FFSampledSP on MacOSX but I couldn’t make it working

  These are the steps I executed :

  1. I downloader the jar here :
  2. I added the jar into my build path using eclipse
  3. I downloaded the native library ffsampledsp-universal-0.9.9.jnilib here
  4. I renamed the library to libffsampledsp.jnilib
  5. I put the library into the java.library.path

  Then I tried to play the file with the java audio player developed but without any success

  It fails on

  File encodedFile = new File(audioFilePath);
  
  AudioInputStream pcmStream = AudioSystem.getAudioInputStream(encodedFile);

  This is the error :

  java.lang.UnsatisfiedLinkError: no ffsampledsp-x86_64-darwin in java.library.path
  
  at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1857)
  
  at java.lang.Runtime.loadLibrary0(Runtime.java:870)
  
  at java.lang.System.loadLibrary(System.java:1119)
  
  at com.tagtraum.ffsampledsp.FFNativeLibraryLoader.loadLibrary(FFNativeLibraryLoader.java:107)
  
  at com.tagtraum.ffsampledsp.FFNativeLibraryLoader.loadLibrary(FFNativeLibraryLoader.java:89)
  
  at com.tagtraum.ffsampledsp.FFNativeLibraryLoader.loadLibrary(FFNativeLibraryLoader.java:73)
  
  at com.tagtraum.ffsampledsp.FFAudioFileReader.<clinit>(FFAudioFileReader.java:51)
  
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  
  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
  
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  
  at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
  
  at java.lang.Class.newInstance(Class.java:438)
  
  at java.util.ServiceLoader$LazyIterator.nextService(ServiceLoader.java:380)
  
  at java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:404)
  
  at java.util.ServiceLoader$1.next(ServiceLoader.java:480)
  
  at com.sun.media.sound.JSSecurityManager.getProviders(JSSecurityManager.java:216)
  
  at com.sun.media.sound.JDK13Services.getProviders(JDK13Services.java:107)
  
  at javax.sound.sampled.AudioSystem.getProviders(AudioSystem.java:1631)
  
  at javax.sound.sampled.AudioSystem.getAudioFileReaders(AudioSystem.java:1406)
  
  at javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:1175)
  
  at com.audioplayer.AudioPlayer.load(AudioPlayer.java:47)
  
  at com.view.PlayerView$2.run(PlayerView.java:375)
  
  at java.lang.Thread.run(Thread.java:745)
  
  Nov 25, 2014 9:20:14 AM com.tagtraum.ffsampledsp.FFNativeLibraryLoader loadLibrary
  
  SEVERE: Failed to load native library 'ffsampledsp'. Please check your library path. FFSampledSP        will be dysfunctional.
  
  </clinit>

  Apparently it does not find the ffsampledsp-x86_64-darwin library

  Therefore I tried to import it directly using the following but still without any result

  static 
  
  {
  
      try 
  
      {
  
          System.load("/Users/server/Desktop/libffsampledsp.jnilib");
  
      } 
  
      catch (UnsatisfiedLinkError e) 
  
      {
  
        System.err.println("Native code library failed to load.\n" + e);
  
        System.exit(1);
  
      }
  
  }

  Do you know where the issue is ?

• checkasm/arm : preserve the stack alignment checkasm_checked_call

  12 juillet 2016, par Janne Grunau

  checkasm/arm : preserve the stack alignment checkasm_checked_call
  The stack used by checkasm_checked_call_vfp was a multiple of 4 when the
  
  checked function is called. AAPCS requires a double word (8 byte)
  
  aligned stack public interfaces. Since both calls are public interfaces
  
  the stack is misaligned when the checked is called.
  Might fix the SIGBUS error in the armv7-linux-clang-3.7 fate config.
  

  • [DBH] tests/checkasm/arm/checkasm.S