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• 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)

• Selecting a library / framework for video capture & recording

  21 décembre 2011, par Saurabh Gandhi

  In one of the project that we have undertaken we are looking for a video capture & recording library. Our groundwork (based on google search) shows that vlc (libvlc), ffmpeg (libavcodec) and gstreamer are the three popular free and open source libraries / multimedia frameworks available for the same. How do these libraries compare on the following parameters :

  1. Licensing policy to allow use within a commercial product without the need to open source any of the components of the product that is using the library
  2. Ability to be used effectively in a multi-threaded environment (library should be inherently thread-safe)
  3. Easy to use and maintain
  4. Documentation : API should be well documented...this is relative... :)

  Our primary intention is to be able to capture RTSP video streams (H.264/MPEG-2/MJPEG encoded), convert these streams to raw video / frames so that it can be used for analysis / processing and later on compress these frames and store it on the disk in the form of an MP4 file (using MPEG2 / H.264 encoding).

  P.S. We understand that FFmpeg is also one of the components of vlc since vlc uses libavcodec library. Is the same true for gstreamer as well ? Does it have any ffmpeg dependency ?

  Awaiting your responses.

  Regards,

  Saurabh Gandhi

• cvCaptureFromFile always returns NULL, Visual Studio 2005

  14 septembre 2012, par user1671173

  I've got a problem with the cvCaptureFromFile function. It always returns NULL. I've done some research on the internet and I've added PATH to ffmpeg's "bin" directory.
  But it's still the same. So I've tried to open the desired file with ffplay.exe. It returns an error which says "Invalid data found when processing an input". It is a "mjpg" file, which should be played with ffmpeg. Then I tried the same with some "mpg" file.
  Now the message is "no such file or directory" which is not true, because the file is in the place. What else should I do ?
  The files all right with Media-Player and VLC player.
  Please help !