linux【redhat&ubuntu】下ffmpeg-3.1安装编译及视频转码

一 ffmpeg编译安装

原文网址：https://www.cnblogs.com/miaosha5s/p/7670447.html

# wget http://www.ffmpeg.org/releases/ffmpeg-3.1.tar.gz# tar -zxvf ffmpeg-3.1.tar.gz# cd ffmpeg-3.1# ./configure --prefix=/usr/local/ffmpeg# make && make install 等待安装完成... # vi /etc/profile在最后PATH添加环境变量：PATH=$PATH:/usr/local/ffmpeg/binexport PATH保存退出 # source /ect/profile   设置生效# ffmpeg -version       查看版本

注意：

若安装过程中出现以下错误：

yasm/nasm not found or too old. Use –disable-yasm for a crippled build.

If you think configure made a mistake, make sure you are using the latest
version from Git. If the latest version fails, report the problem to the
[e-mail] mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file “config.log” produced by configure as this will help
solve the problem.

如错误提示，yasm未安装或者版本太老了，需要安装新版的yasm

# wget http://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz

# tar -zxvf yasm-1.3.0.tar.gz

# cd yasm-1.3.0

# ./configure

# make && make install

问题：在其他机器安装时，还遇到了下面的几个问题，可供参考：

1、使用./configure 时，出现：

If gcc is a cross-compiler, use the --enable-cross-compile option.Only do this if you know what cross compiling means.C compiler test failed.

If you think configure made a mistake, make sure you are using the latestversion from Git.  If the latest version fails, report the problem to [e-mail] mailing list or IRC #ffmpeg on irc.freenode.net.Include the log file "config.log" produced by configure as this will helpsolve the problem.

提示是gcc的问题，并提示了可以查看config.log。cat config.log 查看错误信息如下【这里只粘贴最后的错误信息】：

END /tmp/ffconf.A6YIvVF3.cgcc -c -o /tmp/ffconf.kvhyNUCz.o /tmp/ffconf.A6YIvVF3.c./configure: line 875: gcc: command not foundC compiler test failed.

显然，是没有找到gcc命令。。 通过yum 或 apt-get命令安装即可，之后再进行./configure ,便可以继续安装

2、运行./configure 会报错，错误提示为：
　　configure: error: C++ preprocessor “/lib/cpp” sanity check
　　check See `config.log’ for more details

　　解决办法：出现该情况是由于c++编译器的相关package没有安装，在终端上执行：
　　$ sudo yum install glibc-headers gcc-c++

windows下的编译步骤，参考：http://blog.csdn.net/zhouyongku/article/details/44961447

二 、视频转码命令

由于需求的来源是要把h264裸流转换成mp4，好供前端页面进行播放（js的视频播放器支持的格式比较有限。。由于开发时间紧张，所以也没有足够的经历自己开发或找到现成的播放器，所以暂时只能采用编码的方案）。

ffmpeg命令：264转mp4

 ffmpeg -i slamtv60.264 -vcodec copy -f mp4 test.mp4

执行中打印的信息如下：

ffmpeg version 3.1 Copyright (c) 2000-2016 the FFmpeg developers  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-11)  configuration: --prefix=/usr/local/ffmpeg  libavutil      55. 27.100 / 55. 27.100  libavcodec     57. 48.101 / 57. 48.101  libavformat    57. 40.101 / 57. 40.101  libavdevice    57.  0.101 / 57.  0.101  libavfilter     6. 46.102 /  6. 46.102  libswscale      4.  1.100 /  4.  1.100  libswresample   2.  1.100 /  2.  1.100Input #0, h264, from 'slamtv60.264':  Duration: N/A, bitrate: N/A    Stream #0:0: Video: h264 (Main), yuv420p, 384x288, 25.50 fps, 25.50 tbr, 1200k tbn, 51 tbcFile 'test.mp4' already exists. Overwrite ? [y/N] y[mp4 @ 0x3913260] Using AVStream.codec to pass codec parameters to muxers is deprecated, use AVStream.codecpar instead.Output #0, mp4, to 'test.mp4':  Metadata:    encoder         : Lavf57.40.101    Stream #0:0: Video: h264 ([33][0][0][0] / 0x0021), yuv420p, 384x288, q=2-31, 25.50 fps, 25.50 tbr, 1200k tbn, 1200k tbcStream mapping:  Stream #0:0 -> #0:0 (copy)Press [q] to stop, [?] for help[mp4 @ 0x3913260] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properlyframe= 1479 fps=0.0 q=-1.0 Lsize=    4890kB time=00:00:58.31 bitrate= 687.0kbits/s speed=2.41e+03x    video:4884kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 0.139057%

转换速度还是很快的，5M的一个.264文件，转换成mp4耗时在毫秒级。【不过是在配置较高的机器，x86_64，8核内存20G的服务器】

三 Java代码调用命令

使用的还是简单的java中执行shell命令的方法，考虑到都在java中实现的话可以在一个任务中完成操作，不必在使用shell衔接，增加复杂度。

代码如下：

package schedule;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;public class FfmpegTranscode {public static void runCmd(String command) {try {Runtime rt = Runtime.getRuntime();Process proc = rt.exec(command);InputStream stderr = proc.getErrorStream();InputStreamReader isr = new InputStreamReader(stderr);BufferedReader br = new BufferedReader(isr);String line = null;System.out.println("<LogInfo>");while ((line = br.readLine()) != null){System.out.println(line);}System.out.println("</LogInfo>");int exitVal = proc.waitFor();System.out.println("Process exitValue: " + exitVal);} catch (Exception e) {e.printStackTrace();}}public static void main(String[] args) {if(args.length<2) {System.out.println("请输入源文件和输出文件位置，源文件为264，输出mp4! ");return;}String h264Path = args[0];String mp4Path = args[1];System.out.println("执行转码:"+h264Path +" "+mp4Path);String videoCommand = "ffmpeg -i "+h264Path+" -vcodec copy -f mp4 "+mp4Path;System.out.println(videoCommand);runCmd(videoCommand);}}

执行时，需要在有ffmpeg的环境下运行。可以打成jar包后，上传到上面已安装ffmpeg的机器，通过命令：

java -jar ffmpegtools.jar ./slamtv60.264 ./slamtv60.mp4 的方式执行（slamtv60.264替换成自己的264文件）

四 、流数据转换【待续-研究中】

虽然【二】中已经实现了文件的转换，但更希望可以直接针对流数据进行处理，可以减少存储文件和读取的时间；直接把h264的流处理成mp4流后再写入指定位置。

http://blog.csdn.net/firehood_/article/details/8813587