Recherche avancée

Sur d’autres sites (7196)

• Ndk : Button event error Fatal 11 SIGSEGV when video streaming

  24 avril 2015, par user3773632

  I’m using ffmpeg in ndk, make video streaming service.

  my problem is that Video streaming when the button is pressed, an fatal 11 SIGSEGV error occurs.

  this my source

  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.fragment_main);
  
  
  
      Log.v("LOG", "CREATE");
  
  
  
      mUHSurfaceView = (UHSurfaceView) findViewById(R.id.uhsurfaceview); 
  
      bCamera = (Button)findViewById(R.id.camera);
  
  
  
      bCamera.setOnClickListener(new OnClickListener() {
  
          @Override
  
          public void onClick(View v) {
  
              // TODO Auto-generated method stub
  
              Log.v("CameraButton", "CameraButton");
  
          }
  
      });

  In ndk using ffmpeg h264 decoding and rgb24 through opengl(GLSurfaceView) screen output.
  I don’t know why occur this error i can’t solve error
  please help me !

  my device : Samsung galaxy s4 mini
  android : 4.2.2

  Thanks.

• FFmpeg exit value = 4

  13 mai 2013, par Yuliya Tarasenko

  I try to run ffmpeg command on android devices. On some of them the code below works excellent and the video is created. But on some(e.g. motorola xoom) the exit value is 4. And while debugging on samsung galaxy s 2.3.3 it frozes up on process.waitFor() ;
  Could anyone help me please ? I can't understand what is wrong.

  public void execFfmpeg(){
  
      try {
  
          File resultFile = new File(mContext.getFilesDir() + "/ffmpeg");
  
          String[] command = null;
  
          command = new String[] {
  
              resultFile.getAbsolutePath(),
  
              "-shortest",
  
              "-i",
  
              audioPath,
  
              "-loop",
  
              "1",
  
              "-i",
  
              imagePath, "-acodec", "ac3", "-ab", "128k", "-vcodec",
  
              "mpeg4", videoFileName };
  
  
  
  
  
          if(command != null){
  
              Process process = Runtime.getRuntime().exec(command);
  
              process.waitFor();
  
              dumpStream(process.getInputStream());
  
              dumpStream(process.getErrorStream());
  
              mLogger.error("" + process.exitValue());
  
  
  
              if(process.exitValue() == 0){
  
              } 
  
              }
  
          }
  
      } catch (IOException e) {
  
          e.printStackTrace();
  
      } catch (InterruptedException e) {
  
          e.printStackTrace();
  
      }
  
  }

• subprocess called from multiprocess not finishing

  24 juin 2020, par Pavel Komarov

  I've got a set of videos from which I'm trying to pull random frames. There are a lot of videos, so I want to work in parallel, and ffmpeg can splice out the frames for me, so here's the important part of the code :

  


  import os
from tqdm import tqdm
from joblib import Parallel, delayed
from multiprocessing import current_process
from subprocess import Popen

vids_dir = 'just a string'
out_dir = 'another string'

def process_each(f):
    temp = 'temp' + str(current_process()._identity[0])
    os.mkdir(temp)

    proc = Popen(['ffmpeg -i ' + vids_dir + '/' + f + ' ' + temp + '/' + f[:-4] + '_%03d.jpg &> /dev/null'], shell=True) # convert to frames
    proc.wait()

    # do stuff

    os.system('rm -rf ' + temp) # clean up


Parallel(n_jobs=10)(delayed(process_each)(f) for f in tqdm(os.listdir(vids_dir)))


  


  I can print out the command being passed to Popen and execute it in a shell, and it works. I can open a python3 session and call the command from Popen or subprocess.call or even os.system, and it works. I can even set n_jobs=1 in my Parallel, and it works.

  


  But the moment I actually parallelize this, I find ffmpeg doesn't flush its full results to the temporary folders ; it only gets the first one or few frames.

  


  What on earth could be going on ? subprocess and multiprocessing should be able to mix this way.