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• FFplay/FFmpeg connect to a Socket

  17 janvier 2013, par user1958067

  I hava a Wifi Webcam connected to my PC. that i can get the stream and play it with

  "ffplay http://192.168.43.3:4555" 

  and it works fine !

  Now i would like to plug this cam to the internet with an Android device. I wrote a Android app to connect to the cam via
  Socket s = Socket(192.168.43.3,4555) ;
  and s.getInputStream() gets me the Stream of the cam.

  How can i achieve to play the stream the same way as i mentioned above

  (something like ffplay http://xxx.xxx.xx.x:port) 

  from my server ? I.e. open a socket,etc, ffplay/ffmpeg can connect to.

  Its ok for me, to write an Java programm on the server side where ffmpeg/ffplay is, if its necessary.

  I use "org.apache.commons.io.IOUtils.copy(InputStream,OutputStream)" to redirect one InputStream to other sockets OutputStream.

• opencv4android cvcapturefromfile() return NULL

  15 février 2013, par user1948206

  i am using opencv for android in my project. But when i called method cvCreateFileCapture(), it always return NULL. I know this method needs codecs when working in Windows or Linux, So what can i do when i port this method to Android ? Is FFMPEG working ? How can i build opencv4android that using FFMPEG to decode the input video file ? Thanks.

  these are my codes :

  //Retrieve data from Java, and construct needed structures or instances
  
  char* filePath = (char*)env->GetStringUTFChars(aviPath, false);
  
  
  
  int result=-1;
  
  
  
  LOGD(filePath);
  
  
  
  CvCapture* pCvCapture = cvCreateFileCapture( filePath );
  
      //pCvCpature always NULL
  
  if( NULL == pCvCapture)
  
  {
  
      result = -100;
  
  }
  
  else
  
  {
  
      cvReleaseCapture( &pCvCapture );
  
      result = 100;
  
  }
  
  
  
  env->ReleaseStringUTFChars(aviPath, filePath);
  
  
  
  return (jint)result;

• Building FFMPEG library for iOS5.1 ARMv7

  25 octobre 2012, par Jimmy

  I'm trying to use the FFMPEG library in an XCode 4.5.1 project. And I'm trying to build it for ARMv7

  But I'm running into some major issues, I'm hoping that someone can walk me through how to do it ? I feel a little sketched out reading material thats a couple months old. I'm not aware of the changes.

  New Update (after a lot of time)

  I want to help everyone out that is having this problem because its so frustrating. heres how you do it. I've pasted the configuration stage. This is my ./configure

  ./configure --disable-doc --disable-ffmpeg --disable-ffplay --disable-ffserver --enable-cross-compile --arch=arm --target-os=darwin
  
     --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2
  
     --as='gas-preprocessor/gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2'
  
     --sysroot=/applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk
  
     --cpu=cortex-a8
  
     --extra-ldflags='-isysroot /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk'
  
     --enable-pic
  
     --disable-bzlib --disable-gpl --disable-shared --enable-static --disable-mmx --disable-debug --disable-neon
  
     --extra-cflags='-pipe -Os -gdwarf-2 -isysroot /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk -m${thumb_opt:-no-thumb} -mthumb-interwork'

  This ended up working for me. I had the following problems.

  • I had to download ( https://github.com/yuvi/gas-preprocessor ) copy the file gas-preprocessor.pl at /usr/local/bin. Set permissions to read write (777)
  • Make sure I'm using the right GCC compiler : /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/llvm-gcc-4.2/bin/arm-apple-darwin10-llvm-gcc-4.2
  • Make sure I'm using the right SDK : /applications/xcode.app/contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.1.sdk
  • —extra-cflags="-arch armv7" causes bugs in the configure. take it out. This was causing my gcc compile errors. (specifically this one : error : unrecognized command line option “-arch”.)

  I'll let you guys know how much further I get.