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• H264 encoder settings

  30 novembre 2011, par Chris Robinson

  I'm using xuggler to encode a series of images to an MP4 file. I use the following code to setup the IStreamCoder and specify the H264 codec :

  // only set if codec is H264
  
  Configuration.configure("/usr/local/xuggler/share/ffmpeg/libx264-hq.ffpreset",
  
              outStreamCoder);
  
  
  
  outStreamCoder.setNumPicturesInGroupOfPictures(12);
  
  outStreamCoder.setCodec(codec);
  
  outStreamCoder.setBitRate(videoSettings.getBitrate());
  
  outStreamCoder.setBitRateTolerance(videoSettings.getBitrateTolerance());
  
  outStreamCoder.setPixelType(IPixelFormat.Type.YUV420P);
  
  outStreamCoder.setHeight(videoSettings.getResolution().height);
  
  outStreamCoder.setWidth(videoSettings.getResolution().width);
  
  outStreamCoder.setFlag(IStreamCoder.Flags.FLAG_QSCALE, true);
  
  outStreamCoder.setGlobalQuality(0);
  
  fps = IRational.make((int) videoSettings.getFramerate(), 1);
  
  outStreamCoder.setFrameRate(fps);
  
  outStreamCoder.setTimeBase(IRational.make(fps.getDenominator(), fps.getNumerator()));

  which yields the following output :

  Codec: CODEC_ID_H264
  
  Resolution: 1280x720
  
  Bitrate: 25000
  
  Bitrate Tolerance: 1000
  
  Framerate: 25.0

  

  Now when I specify the MPEG4 codec, I get the following output :

  Codec: CODEC_ID_MPEG4
  
  Resolution: 1280x720
  
  Bitrate: 25000
  
  Bitrate Tolerance: 1000
  
  Framerate: 25.0

  

  As you can see, the only difference is the ICodec type (MPEG4 instead of H264) and the use of the preset (which is required by xuggler when using an H264 codec). Can anyone explain to me the huge difference in quality and tell me how to resolve the issue ?

• Live stream playing

  20 décembre 2011, par John Smith

  well, I can capture the incoming stream. Its produced by FFMpeg. The php code Im doing it with :

  $address = '127.0.0.1';
  
  $port = 1234;
  
  $outfile = "output.flv";
  
  
  
  $ofp = fopen($outfile, 'w');
  
  
  
   if (($sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) === false) { echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n"; sleep (5); die; }
  
   if (socket_bind($sock, $address, $port) === false) { echo "socket_bind() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n"; sleep (5); die; }
  
   if (socket_listen($sock, 5) === false) { echo "socket_listen() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n"; sleep (5); die; }
  
   if (($msgsock = socket_accept($sock)) === false) { echo "socket_accept() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n"; sleep (5); break; }
  
   do {
  
      $a = '';
  
      socket_recv ($msgsock, $a, 65536, MSG_WAITALL);
  
      fwrite ($ofp, $a);
  
      echo strlen($a);
  
   } while (true);

  so it produces good file, if I replay this it looks good. But I want to stream it on a site, if I just put a link to the .flv, it would play it from the beginning. How to make it real live ? Thanx in advance.

• Android and ffmpeg libb - can't build

  15 décembre 2011, par nmnir

  I'm trying to build my native app with ffmpeg. the ndk-build output is

      $ ../../../ndk-build
    Prebuilt       : libffmpeg.so <=
    cp: omitting directory

  /cygdrive/c/android2/android-ndk-r6/samples/native-audio/jni'
  make : * [/cygdrive/c/android2/android-ndk-r6/samples/native-audio/obj/local/armeabi/libffmpeg.so] Error 1

  Here is my Android.mk :

  LOCAL_PATH := $(call my-dir) 
  
  #declare the prebuilt library 
  
  include $(CLEAR_VARS) 
  
  LOCAL_MODULE := ffmpeg-prebuilt 
  
  LOCAL_SRC_FILES := ffmpeg/android/armv7-a/libffmpeg.so 
  
  LOCAL_EXPORT_C_INCLUDES := ffmpeg/android/armv7-a/include 
  
  LOCAL_EXPORT_LDLIBS := ffmpeg/android/armv7-a/libffmpeg.so 
  
  LOCAL_PRELINK_MODULE := true 
  
  include $(PREBUILT_SHARED_LIBRARY) 
  
  
  
  include $(CLEAR_VARS) 
  
  LOCAL_ALLOW_UNDEFINED_SYMBOLS=false 
  
  LOCAL_MODULE := native-audio-jni 
  
  LOCAL_SRC_FILES := native-audio-jni.cpp 
  
  LOCAL_C_INCLUDES := $(LOCAL_PATH)/ffmpeg/android/armv7-a/include 
  
  LOCAL_SHARED_LIBRARY := ffmpeg-prebuilt 
  
  LOCAL_LDLIBS    := -lOpenSLES -landroid -llog -ljnigraphics -lz -lm $(LOCAL_PATH)/ffmpeg/android/armv7-a/libffmpeg.so 
  
  LOCAL_STATIC_LIBRARY := stdc++
  
  include $(BUILD_SHARED_LIBRARY)