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Sur d’autres sites (13726)

  • 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)

  • 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.

  • 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

    H264 encoded video

    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

    MPEG4 encoded video

    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 ?

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