使用ffmpeg库编译c代码时出错 [英] errors when compiling c code with ffmpeg library
本文介绍了使用ffmpeg库编译c代码时出错的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
/ home / broadstand / ffmpeg_build / lib / libavutil .a（hwcontext_vaapi.o）：在函数`vaapi_device_free'中：
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:861：未定义的引用到`XCloseDisplay'
/ home / expandingstand / ffmpeg_build / lib / libavutil.a（hwcontext_vaapi.o）：在函数`vaapi_device_create'中：
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:891：未定义的引用`XOpenDisplay'
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:896：未定义的引用vaGetDisplay
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:903：未定义的引用XDisplayName
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:893：未定义的引用XDisplayName
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:917：未定义的引用到vaGetD isplayDRM'
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:891：未定义的引用XOpenDisplay
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:893：未定义的引用XDisplayName
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:898：未定义的引用XDisplayName
/home/widerstand/ffmpeg_build/lib/libavutil.a（ hwcontext_vdpau.o）：在函数`vdpau_device_create'中：
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:431：未定义的引用XOpenDisplay
/ home / broadstand / ffmpeg_sources / ffmpeg /libavutil/hwcontext_vdpau.c:437：未定义的引用XDisplayString
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:439：未定义的引用XDefaultScreen
/ home / /ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:439：未定义的引用vdp_device_create_x11
/ home / broadstand / ffmpeg_sources / ffmpeg / lib avutil / hwcontext_vdpau.c：433：未定义的引用XDisplayName
/home/widerstand/ffmpeg_build/lib/libavutil.a(hwcontext_vdpau.o）：在函数`vdpau_device_free'中：
/ home / expandingstand /ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:410：未定义的引用XCloseDisplay
collect2：错误：ld返回1退出状态
Makefile：30：目标video_analysis的配方失败
make：*** [video_analysis]错误1
我已经重新安装了ffmpeg库多次使用以下配置：
PATH =$ HOME / bin：$ PATHPKG_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-li bfdk-aac \
--enable-libfreetype \
--enable-libmp3lame \
--enable-libopus \
--enable-libtheora \
--enable-libvorbis \
--enable-libvpx \
--enable-libx264 \
--enable-nonfree
PATH =$ HOME / bin：$ PATHmake
安装过程每次都成功。但是当我尝试编译我自己的c代码时，我总是遇到与上述相同的错误。我不知道那个...
这是我使用的makefile：
编辑：
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：默认所有清理
默认值：$（TARGET）
全部：默认
OBJECTS = $（patsubst％.c，％.o，$（通配符* .c））
HEADERS = $（通配符* .h）
％ .o：％.c $（HEADERS）
$（CC）$（CFLAGS）-c $< -o $ @
.PRECIOUS：$（TARGET）$（OBJECTS）
$（TARGET）：$（OBJECTS）
$（CC）$ OBJECTS）$（LDLIBS）$（LIBS）-o $ @
clean：
-rm -f * .o
-rm -f $（TARGET）
编辑：
Afer在30号交换$（LIBS）和$（LDLIBS）为$（LDLIBS）$（LIBS），看起来好多了，但编译器仍然报告以下错误：
/root/ffmpeg_build/lib/libavutil.a（hwcontext_vaapi.o）：在函数`vaapi_device_create'中：
/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c： 896：未定义的引用vaGetDisplay
/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:917：未定义的引用vaGetDisplayDRM
我不知道哪个图书馆还缺少？看起来好像libva还是丢失了吗？
我自己得到了答案...看看这里：
解决方案
您需要链接到提供这些功能的库以及FFmpeg。
您需要添加的链接器标志（及其各自的错误）：
-lvdpau - libvdpau-dev
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:439：未定义的引用到`vdp_device_create_x11'
-lva - <一个href =https://launchpad.net/ubuntu/+source/libva =noreferrer> libva-dev
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:896：undefined re vaGetDisplay
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:917：未定义的引用vaGetDisplayDRM
-lX11 - libx11-dev
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:861 ：未定义的引用XCloseDisplay
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:898：未定义的引用XDisplayName
/ home / broadstand / ffmpeg_sources / ffmpeg / libavutil / hwcontext_vdpau .c：431：未定义的引用XOpenDisplay
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:437：未定义的引用XDisplayString
/ home / broadstand / ffmpeg_sources / ffmpeg /libavutil/hwcontext_vdpau.c:439：未定义的引用XDefaultScreen
需要添加这些标志在你的 -lav * 链接器之后标志。
编辑：OP添加makefile
也可以使用所有库的pkg-config。
FFMPEG_LIBS = libavdevice \
libavformat \
libavfilter \
libavcodec \
libswresample \
libswscale \
libavutil
PKG_CFG_LIBS = x11 \
vdpau \
libva \
$（FFMPEG_LIBS）
TARGET = video_analysis
LIBS = -lm
CC = gcc
CFLAGS + = -O2 - g -O0
CFLAGS：= $（shell pkg-config --cflags $（PKG_CFG_LIBS））$（CFLAGS）
LDLIBS：= $（shell pkg-config --libs $ （PKG_CFG_LIBS））$（LDLIBS）
.PHONY：默认所有清理
默认值：$（TARGET）
全部：默认
OBJECTS = $（patsubst％.c，％.o，$（通配符* .c））
HEADERS = $（通配符* .h）
％.o：％.c $（HEADERS）
$（CC）$（CFLAGS）-c $< -o $ @
.PRECIOUS：$（TARGET）$（OBJECTS）
$（TARGET）：$（OBJECTS）
$（CC）$ OBJECTS）$（LIBS）$（LDLIBS）-o $ @
clean：
-rm -f * .o
-rm -f $（TARGET）
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'
解决方案
You need to link with the libraries which provide those functions as well as FFmpeg.
The linker flags you need to add are (with their respective errors):
-lvdpau - libvdpau-dev
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vdpau.c:439: undefined reference to `vdp_device_create_x11'
-lva - libva-dev
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:896: undefined reference to `vaGetDisplay'
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:917: undefined reference to `vaGetDisplayDRM'
-lX11 - libx11-dev
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:861: undefined reference to `XCloseDisplay'
/home/widerstand/ffmpeg_sources/ffmpeg/libavutil/hwcontext_vaapi.c:898: undefined reference to `XDisplayName'
/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'
These flags need to be added after your -lav* linker flags.
Edit: OP added makefile
You can also use pkg-config for all the libraries.
FFMPEG_LIBS= libavdevice \
libavformat \
libavfilter \
libavcodec \
libswresample \
libswscale \
libavutil
PKG_CFG_LIBS= x11 \
vdpau \
libva \
$(FFMPEG_LIBS)
TARGET = video_analysis
LIBS = -lm
CC = gcc
CFLAGS += -O2 -g -O0
CFLAGS := $(shell pkg-config --cflags $(PKG_CFG_LIBS)) $(CFLAGS)
LDLIBS := $(shell pkg-config --libs $(PKG_CFG_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) $(LIBS) $(LDLIBS) -o $@
clean:
-rm -f *.o
-rm -f $(TARGET)
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