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• Surface Texture object is not getting the frames from a Surface Class

  22 avril 2016, par Juan Manuel González Otero

  On the one hand, I have a Surface Class which when instantiated, automatically initialize a new thread and start grabbing frames from a streaming source via native code based on FFMPEG. Here is the main parts of the code for the aforementioned Surface Class :

   public class StreamingSurface extends Surface implements Runnable {
  
  
  
      ...
  
  
  
      public StreamingSurface(SurfaceTexture surfaceTexture, int width, int height) {
  
          super(surfaceTexture);
  
  
  
          screenWidth  = width;
  
          screenHeight = height;      
  
          init();
  
  
  
      }
  
  
  
      public void init() {
  
          mDrawTop = 0;
  
          mDrawLeft = 0;
  
          mVideoCurrentFrame = 0;
  
          this.setVideoFile();
  
          this.startPlay();
  
      }
  
  
  
      public void setVideoFile() {        
  
          // Initialise FFMPEG
  
          naInit("");
  
  
  
          // Get stream video res
  
          int[] res = naGetVideoRes();
  
          mDisplayWidth = (int)(res[0]);
  
          mDisplayHeight = (int)(res[1]);
  
  
  
          // Prepare Display
  
          mBitmap = Bitmap.createBitmap(mDisplayWidth, mDisplayHeight, Bitmap.Config.ARGB_8888);
  
          naPrepareDisplay(mBitmap, mDisplayWidth, mDisplayHeight);
  
      }
  
  
  
      public void startPlay() {
  
          thread = new Thread(this);
  
          thread.start(); 
  
      }
  
  
  
      @Override
  
      public void run() {
  
          while (true) {
  
              while (2 == mStatus) {
  
                  //pause
  
                  SystemClock.sleep(100);
  
              }
  
              mVideoCurrentFrame = naGetVideoFrame();
  
              if (0 < mVideoCurrentFrame) {
  
                  //success, redraw
  
                  if(isValid()){
  
                       Canvas canvas = lockCanvas(null);
  
                       if (null != mBitmap) {
  
                           canvas.drawBitmap(mBitmap, mDrawLeft, mDrawTop, prFramePaint);
  
                       }
  
                       unlockCanvasAndPost(canvas);
  
                  }
  
              } else {
  
                  //failure, probably end of video, break
  
                  naFinish(mBitmap);
  
                  mStatus = 0;
  
                  break;
  
              }
  
          }   
  
      }
  
  
  
  }

  In my MainActivity class, I instantiated this class in the following way :

  public void startCamera(int texture)
  
  {
  
      mSurface = new SurfaceTexture(texture);
  
      mSurface.setOnFrameAvailableListener(this); 
  
      Surface surface = new StreamingSurface(mSurface, 640, 360);
  
      surface.release();        
  
  }

  I read the following line in the Android developer page, regarding the Surface class constructor :

  "Images drawn to the Surface will be made available to the SurfaceTexture, which can attach them to an OpenGL ES texture via updateTexImage()."

  That is exactly what I want to do, and I have everything ready for the further renderization. But definitely, with the above code, I never get my frames captured in the surface class transformed to its corresponding SurfaceTexture. I know this because the debugger, for instace, never call the OnFrameAvailableLister method associated with that Surface Texture.

  Any ideas ? Maybe the fact that I am using a thread to call the drawing functions is messing everything ? In such a case, what alternatives I have to grab the frames ?

  Thanks in advance

• Subprocess call stopping asynchronously-executed Python parent process

  6 mai 2016, par Suriname0

  The following shell session demonstrates the behavior I am seeing :

  [user@compname python-test]$ cat test.py
  
  #!/usr/bin/env python
  
  import subprocess
  
  from time import sleep
  
  proc = subprocess.Popen("ffmpeg", stdout=subprocess.PIPE, stderr=subprocess.STDOUT, shell=True)
  
  print "Starting process: " + str(proc)
  
  status = proc.poll()
  
  while status is None:
  
      print "Process still running."
  
      sleep(0.01)
  
      status = proc.poll()
  
  print "Status: " + str(status)
  
  [user@compname python-test]$ python test.py
  
  Starting process: 
  
  Process still running.
  
  Process still running.
  
  Status: 1
  
  [user@compname python-test]$ python test.py &
  
  [4] 6976
  
  [user@compname python-test]$ Starting process: 
  
  Process still running.
  
  Process still running.
  
  [4]+  Stopped                 python test.py
  
  [user@compname python-test]$ ps
  
    PID TTY          TIME CMD
  
   4684 pts/101  00:00:00 python
  
   4685 pts/101  00:00:00 ffmpeg
  
   7183 pts/101  00:00:00 ps
  
  14385 pts/101  00:00:00 bash

  As you can see, when the simple test Python program is run normally, it completes successfully. When it is run asynchronously (using &), the Python process is stopped as soon as the subprocess call is complete (and poll() would return a non-None value).

  1. The same behavior occurs when using Popen.wait()
  2. The behavior is unique to ffmpeg.
  3. Both the Python process and ffmpeg are ending up stopped, as seen in the call to ps.

  Can someone help me detangle this behavior ? I don’t see anything in the documentation for the subprocess module, bash’s & operator, or ffmpeg that would explain this.

  The Python version is 2.6.6, bash is GNU bash version 4.1.2(1)-release (x86_64-redhat-linux-gnu), ffmpeg is version 3.0.1-static.

  Thank you for any help !

• ffmpeg command running stand alone but not from a linux script

  31 mai 2016, par user1490563

  i made a simple script that breaks a flv file into multiple parts, convert them all to .mp4 individually and then merge all of them to form a final mp4 file. i did this to save time and convert large files in parallel.

  however, i am stuck because the command that normally run on command line for ffmpeg, dont run via script.

  I am kind of stuck here and will like to have some assistance.

  #!/bin/bash
  
  
  
  
  
  #sleep 5
  
  
  
  
  
  filenametmp=$1;
  
  
  
  filename=`echo "$filenametmp" | awk '{split($0,a,"."); print a[1]}'`
  
  
  
  
  
  echo $filename
  
  
  
  output="$filename-output"
  
  
  
  filenamewithoutpath=`echo "$output" | awk '{split($0,a,"/"); print a[4]}'`
  
  
  
  echo $output $filenamewithoutpath
  
  
  
  /usr/bin/ffmpeg -i $filenametmp -c copy -map 0 -segment_time $2 -f segment $output%01d.flv
  
  
  
  #sleep 10
  
  
  
  
  
  #echo "/bin/ls -lrt /root/storage/ | /bin/grep $filenamewithoutpath | /usr/bin/wc -l"
  
  filecounttmp=`/bin/ls -lrt /opt/storage/ | /bin/grep $filenamewithoutpath | /usr/bin/wc -l`
  
  
  
  filecount=`expr $filecounttmp - 1`
  
  
  
  echo $filecount
  
  
  
  for i in `seq 0 $filecount`
  
  do
  
  
  
  
  
  suffix=`expr 0000 + $i`
  
  
  
  filenametoconvert="$output$suffix.flv"
  
  convertedfilename="$output$suffix.mp4"
  
  echo $filenametoconvert
  
  
  
  /usr/bin/ffmpeg -i $filenametoconvert -c:v libx264 -crf 23 -preset medium -vsync 1 -r 25 -c:a aac -strict -2 -b:a 64k -ar 44100 -ac 1 $convertedfilename > /dev/null 2>&1 &
  
  
  
  
  
  done
  
  
  
  
  
  
  
  
  
  
  
  sleep 5
  
  
  
  concatstring=""
  
  
  
  for j in `seq 0 $filecount`
  
  do
  
  
  
  
  
  suffix=`expr 0000 + $j`
  
  
  
  convertedfilenamemp4="$output$suffix.mp4"
  
  
  
  #concatstring=`concat:$concatstring|$convertedfilenamemp4`
  
  
  
  echo "file" $convertedfilenamemp4 >> $filename.txt
  
  
  
  #ffmpeg -i concat:"$concatstring" -codec copy $filename.mp4
  
  
  
  #ffmpeg -f concat -i $filename.txt -c copy $filename.mp4
  
  
  
  
  
  done
  
  
  
  echo $concatstring
  
  
  
  ffmpeg -f concat -i $filename.txt -c copy $filename.mp4
  
  
  
  
  
  rm $output*
  
  rm $filename.txt

  following is how to run this on any flv file

  ./ff.sh /opt/storage/tttttssssssssss_573f5b1cd473202daf2bf694.flv 20

  Any help will be appreciated and any input required will be given.

  I am on Ubuntu 14.04 LTS version. Standard installation of ffmpeg.