Recherche avancée

Sur d’autres sites (6968)

• errors when compiling c code with ffmpeg library

  2 juin 2017, par Kindermann

  I’ve installed ffmpeg library in my new ubuntu 16.04 OS. When I tried to compile my c code, I got the following strange errors :

  /home/widerstand/ffmpeg_build/lib/libavutil.a(hwcontext_vaapi.o): In function `vaapi_device_free':
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:861: undefined reference to `XCloseDisplay'
  
  /home/widerstand/ffmpeg_build/lib/libavutil.a(hwcontext_vaapi.o): In function `vaapi_device_create':
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:891: undefined reference to `XOpenDisplay'
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:896: undefined reference to `vaGetDisplay'
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:903: undefined reference to `XDisplayName'
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:893: undefined reference to `XDisplayName'
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:917: undefined reference to `vaGetDisplayDRM'
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:891: undefined reference to `XOpenDisplay'
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:893: undefined reference to `XDisplayName'
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:898: undefined reference to `XDisplayName'
  
  /home/widerstand/ffmpeg_build/lib/libavutil.a(hwcontext_vdpau.o): In function `vdpau_device_create':
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:431: undefined reference to `XOpenDisplay'
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:437: undefined reference to `XDisplayString'
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:439: undefined reference to `XDefaultScreen'
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:439: undefined reference to `vdp_device_create_x11'
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:433: undefined reference to `XDisplayName'
  
  /home/widerstand/ffmpeg_build/lib/libavutil.a(hwcontext_vdpau.o): In function `vdpau_device_free':
  
  /home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:410: undefined reference to `XCloseDisplay'
  
  collect2: error: ld returned 1 exit status
  
  Makefile:30: recipe for target 'video_analysis' failed
  
  make: *** [video_analysis] Error 1

  I’ve reinstalled ffmpeg library multiple times using the following configurations :

  PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
  
    --prefix="$HOME/ffmpeg_build" \
  
    --pkg-config-flags="--static" \
  
    --extra-cflags="-I$HOME/ffmpeg_build/include" \
  
    --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
  
    --bindir="$HOME/bin" \
  
    --enable-gpl \
  
    --enable-libass \
  
    --enable-libfdk-aac \
  
    --enable-libfreetype \
  
    --enable-libmp3lame \
  
    --enable-libopus \
  
    --enable-libtheora \
  
    --enable-libvorbis \
  
    --enable-libvpx \
  
    --enable-libx264 \
  
    --enable-nonfree
  
  PATH="$HOME/bin:$PATH" make

  The installation process was successful each time. But when I tried to compile my own c code, I always encountered the same errors as mentioned above. I have no idea about that...
  Here is the makefile I used :

  EDIT :

  FFMPEG_LIBS=    libavdevice                        \
  
                  libavformat                        \
  
                  libavfilter                        \
  
                  libavcodec                         \
  
                  libswresample                      \
  
                  libswscale                         \
  
                  libavutil                          \
  
  
  
  TARGET = video_analysis
  
  LIBS = -lX11 -lm -lvdpau -lva
  
  CC = gcc
  
  CFLAGS += -O2 -g -O0
  
  CFLAGS := $(shell pkg-config --cflags $(FFMPEG_LIBS)) $(CFLAGS)
  
  LDLIBS := $(shell pkg-config --libs $(FFMPEG_LIBS)) $(LDLIBS)
  
  
  
  .PHONY: default all clean
  
  
  
  default: $(TARGET)
  
  all: default
  
  
  
  OBJECTS = $(patsubst %.c, %.o, $(wildcard *.c))
  
  HEADERS = $(wildcard *.h)
  
  
  
  %.o: %.c $(HEADERS)
  
      $(CC) $(CFLAGS) -c $< -o $@
  
  
  
  .PRECIOUS: $(TARGET) $(OBJECTS)
  
  
  
  $(TARGET): $(OBJECTS)
  
      $(CC) $(OBJECTS) $(LDLIBS) $(LIBS) -o $@
  
  
  
  clean:
  
      -rm -f *.o
  
      -rm -f $(TARGET)

  EDIT :

  Afer swapping $(LIBS) and $(LDLIBS) to be $(LDLIBS) $(LIBS) at line 30, it looks much better, but the compiler still reports the following errors :

  /root/ffmpeg_build/lib/libavutil.a(hwcontext_vaapi.o): In function `vaapi_device_create':
  
  /ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:896: undefined reference to `vaGetDisplay'
  
  /ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:917: undefined reference to `vaGetDisplayDRM'

  I have no idea which library is still missing ? It looks as if libva were still missing ?...
  I got the answer by myself...Have a look at here : errors of ’vaGetDisplay’ and `vaGetDisplayDRM’

• FFmpeg native AAC decoder

  30 juillet 2015, par Tran Toan

  I’m working on a commercial C\C++ app on Windows that need to decode AAC. I have looked at this question AAC Codec Library (libFAAC alternative)
  From the answer, it seems that FFmpeg has a native LGPL AAC decoder. However, when I looked at FFmpeg home page, I found no information about this decoder or what AAC object type it supports (only information about encoder). I have been searching for this for 2 days but I found almost nothing. So my questions are :

  1. What type of object type does native FFmpeg AAC decoder support or does it even exist ?
  2. If the above decoder does not exist then is there any alternative free library ? I have also looked at FDK AAC but I don’t understand its license, can I use it for commercial product ?

  Please help I’m new to audio codec.

• Ffmpeg not compiling

  25 mai 2018, par Robin Betka

  I’m trying to compile ffmpeg 4.0 for Android (using Ubuntu 64 bit) but I can not get it to work.
  I was able to compile it for Linux itself fairly fast, but now struggling using the NDK. I’m unexperienced with this so I might have some major flaw somewhere. All paths and files exist. Github tutorials are extremely outdated and don’t work as well for me with different errors.

  Getting following error :

  In file included from ./libavformat/internal.h:24:0,
  
               from libavdevice/alldevices.c:23:
  
  /home/lit/Android/Sdk/ndk-bundle/toolchains/arm-linux-androideabi- 
  
  4.9/prebuilt/linux-x86_64/lib/gcc/arm-linux- 
  
  androideabi/4.9.x/include/stdint.h:9:26: fatal error: stdint.h: No such file 
  
  or directory
  
  # include_next 
  
                        ^
  
  compilation terminated.
  
  ffbuild/common.mak:60: recipe for target 'libavdevice/alldevices.o' failed
  
  make: *** [libavdevice/alldevices.o] Error 1

  My build script :

  SYSROOT=/home/lit/Android/Sdk/ndk-bundle/platforms/android-14/arch-arm/
  
  TOOLCHAIN=/home/lit/Android/Sdk/ndk-bundle/toolchains/arm-linux-androideabi- 
  
  4.9/prebuilt/linux-x86_64
  
  
  
  cd ffmpeg/ffmpeg && \
  
  PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" 
  
  ./configure \
  
  --prefix="$HOME/ffmpeg_build" \
  
  --pkg-config-flags="--static" \
  
  --extra-cflags="-O3 -Wall -pipe -ffast-math -fstrict-aliasing -Werror=strict- aliasing -Wno-psabi -Wa,--noexecstack -DANDROID -DNDEBUG-march=armv5te -mtune=arm9tdmi -msoft-float"\
  
  --extra-ldflags="-L$HOME/ffmpeg_build/lib" \
  
  --bindir="$HOME/bin" \
  
  --arch=arm \
  
  --target-os=linux \
  
  --enable-cross-compile \
  
  --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  
  --cpu=armv5te \
  
  --sysroot=$SYSROOT \
  
  --enable-gpl \
  
  --enable-small \
  
  --enable-nonfree && \
  
  
  
  PATH="$HOME/bin:$PATH" make && \
  
  make -j2 && \
  
  make install && \
  
  hash -r

  Thank you for your help.