Linux下安裝FFmpeg

安裝yasm

cd yasm-1.3.0
./configure
make
sudo make install

安裝依賴

sudo apt-get install libfaac-dev libmp3lame-dev libtheora-dev libvorbis-dev libopencore-amrnb-dev libopencore-amrwb-dev libgsm1-dev zlib1g-dev libgpac1-dev

./configure
sudo make
sudo make install

安裝x264

下載原始碼：

git clone --depth 1 git://git.videolan.org/x264

進入原始碼目錄：

cd x264
./configure --enable-shared

如果提示：

 ./configure --enable-shared
Found no assembler
Minimum version is nasm-2.13
If you really want to compile without asm, configure with --disable-asm.

加上–disable-asm，即執行：

./configure --enable-
 
shared --disable-asm

再執行：

sudo make install

安裝ffmpeg

cd ffmpeg-3.4.2
./configure --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags= --host-ldflags= --disable-jack --enable-gpl --enable-libmp3lame --enable-libx264 --enable
 
-libxvid --enable-opencl --disable-lzma

sudo make
sudo make install

動態連結庫

vi /etc/ld.so.conf
加入：/usr/local/lib ##示自己的安裝目錄而定，/usr/local/lib是預設安裝位置

#執行
sudo ldconfig

新增ffmpeg到環境變數

vi /etc/profile

#加入以下內容:
FFMPEG=/usr/local ##示自己的安裝目錄而定
PATH加入:$FFMPEG/bin

#讓環境變數生效
sudo source /etc/profile

驗證安裝是否成功：

#執行
ffmpeg -version
#輸出：
ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers
built with gcc 4.8.2 (GCC)
configuration: --enable-shared --enable-libx264 --enable-gpl --enable-avresample
libavutil      55. 78.100 / 55. 78.100
libavcodec     57.107.100 / 57.107.100
libavformat    57. 83.100 / 57. 83.100
libavdevice    57. 10.100 / 57. 10.100
libavfilter     6.107.100 /  6.107.100
libavresample   3.  7.  0 /  3.  7.  0
libswscale      4.  8.100 /  4.  8.100
libswresample   2.  9.100 /  2.  9.100
libpostproc    54.  7.100 / 54.  7.100

問題

問題1

/usr/bin/ld: libavcodec/mqc.o: relocation R_X86_64_32 against `.rodata' can not be used when making a shared object; recompile with -fPIC

libavcodec/mqc.o: error adding symbols: Bad value

collect2: error: ld returned 1 exit status

解決辦法：
在config.mak檔案Line88(不同版本位置可能不同)加上-fPIC，然後重新編譯。

問題2

ffmpeg: error while loading shared libraries: libavdevice.so.52: cannot open shared object file: No such file or directory

#執行，看看軟連結是否建立
ldd `which ffmpeg`
        libavdevice.so.52 => not found
        libavfilter.so.1 => not found
        libavformat.so.52 => not found
        libavcodec.so.52 => not found
        libswscale.so.0 => not found
        libavcore.so.0 => not found
        libavutil.so.50 => not found
        libm.so.6 => /lib/libm.so.6 (0x006c3000)
        libpthread.so.0 => /lib/libpthread.so.0 (0x007e9000)
        libc.so.6 => /lib/libc.so.6 (0x00575000)
        /lib/ld-linux.so.2 (0x00557000)

解決辦法：

也有可能是該庫並未安裝之類的，只需在./configure時加上該庫即可