Linux下ffmpeg的安裝

ffmpeg官網
當前最新版本ffmpeg-3.4.1

安裝過程

下載yasm

yasm download

解壓yasm

tar xzvf yasm-1.3.0.tar.gz

安裝yasm

cd yasm-1.3.0
./configure
make && make install

下載ffmpeg

ffmpeg download

解壓ffmpeg

tar xvfj ffmpeg-3.1.2.tar.bz2

安裝ffmpeg

cd ffmpeg-3.1.2
./configure --enable-shared --prefix=/usr/local/ffmpeg
make && make install

配置環境變量

echo "export PATH=/usr/local/ffmpeg/bin/:$PATH" >> /etc/profile
. /etc/profile

測試是否正常安裝

ffmpeg --version

若報錯/usr/local/ffmpeg/bin/ffmpeg: error while loading shared libraries: libavdevice.so.: cannot open shared object file: No such file or directory，則須要增長動態庫配置：

echo "/usr/local/ffmpeg/lib" >> /etc/ld.so.conf
ldconfig

成功效果：

[dev@Develop ~]$ ffmpeg -version
ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-4)
configuration: --enable-shared --prefix=/usr/local/ffmpeg
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
libswscale      4.  8.100 /  4.  8.100
libswresample   2.  9.100 /  2.  9.100

網頁中HTML5的video標籤標準是用H.264方式編碼視頻的MP4文件，把一個其餘編碼格式的MP4文件轉換成H.264編碼的MP4文件：ffmpeg -i in.mp4 -vcodec h264 out.mp4

ffmpeg編解碼程序運行報錯Cannot load libcuda.so.1

解決：以H264編解碼爲例，須要先安裝X264庫：

1. 下載X264 git clone http://git.videolan.org/git/x264.git

2. 安裝X264：

./configure --enable-shared --disable-asm
make && make install

3. 從新安裝ffmpeg

./configure --enable-shared --enable-libx264  --enable-gpl  --prefix=/usr/local/ffmpeg
make && make install

# 增長X264 動態庫配置
echo "/usr/local/lib" >> /etc/ld.so.conf
ldconfig

附 Java調用示例

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

/**
 * COMMAND: ffmpeg -i in.mp4 -vcodec h264 out.mp4
 */

public class TransCode {
        public static void main(String[] args) {
                List<String> commend = new ArrayList<String>();
                commend.add("/usr/local/ffmpeg/bin/ffmpeg");
                commend.add("-i");
                commend.add("/home/em/file/in.mp4");
                commend.add("-vcodec");
                commend.add("h264");
                commend.add("-y");
                commend.add("/home/em/file/out.mp4");
                StringBuffer test = new StringBuffer();
                for (int i = 0; i < commend.size(); i++)
                        test.append(commend.get(i) + " ");
                System.out.println(test);
                try {
                        Runtime rt = Runtime.getRuntime();
                        Process proc = rt.exec(test.toString());
                        InputStream stderr = proc.getErrorStream();
                        InputStreamReader isr = new InputStreamReader(stderr);
                        BufferedReader br = new BufferedReader(isr);
                        String line = null;
                        while ((line = br.readLine()) != null)
                                ;
                } catch (IOException e) {
                        e.printStackTrace();
                }
                System.out.println("視頻轉換成功！");
        }
}