Java 视频转换遇到问题及解决

Java 视频转换可能会遇到的问题及解决，很多报错都是没有引入 正确的依赖或者版本的问题（javacv版本及ffmpeg版本）；

1. 正确的依赖

		<!--ffmpeg依赖-->
		<dependency>
			<groupId>org.bytedeco</groupId>
			<artifactId>javacv</artifactId>
			<version>1.5.1</version>
		</dependency>
		<!--windows ffmpeg-->
		<dependency>
			<groupId>org.bytedeco</groupId>
			<artifactId>ffmpeg</artifactId>
			<version>4.1.3-1.5.1</version>
			<classifier>windows-x86_64</classifier>
		</dependency>
		<!--linux ffmpeg-->
		<dependency>
			<groupId>org.bytedeco</groupId>
			<artifactId>ffmpeg</artifactId>
			<version>4.1.3-1.5.1</version>
			<classifier>linux-x86_64</classifier>
		</dependency>

2. 遇到问题及解决

2.1 报错 Exception in thread “main” java.lang.NoClassDefFoundError: java.lang.ClassNotFoundException: org.bytedeco.ffmpeg.avutil

完整报错如下

Exception in thread "main" java.lang.NoClassDefFoundError: java.lang.ClassNotFoundException: org.bytedeco.ffmpeg.avutil
	at org.bytedeco.javacpp.Loader.load(Loader.java:955)
	at org.bytedeco.javacpp.Loader.load(Loader.java:907)
	at com.demo.VideoConverter.ffmpegConvert2Mp4(VideoConverter.java:33)
	at com.demo.VideoConverter.main(VideoConverter.java:121)
Caused by: java.lang.ClassNotFoundException: org.bytedeco.ffmpeg.avutil
	at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at org.bytedeco.javacpp.Loader.load(Loader.java:950)
	... 3 more

     <!--ffmpeg依赖-->
		<dependency>
			<groupId>org.bytedeco</groupId>
			<artifactId>javacv</artifactId>
			<version>1.4.3</version>
		</dependency>
		<!--windows ffmpeg-->
		<dependency>
			<groupId>org.bytedeco</groupId>
			<artifactId>ffmpeg</artifactId>
			<version>4.1.3-1.5.1</version>
		</dependency>

解决： pom依赖及版本问题 更换为上边正确的依赖

2.2 报错 Exception in thread “main” java.lang.UnsatisfiedLinkError: no jniavutil in java.library.path

完整报错如下

Exception in thread "main" java.lang.UnsatisfiedLinkError: no jniavutil in java.library.path
	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
	at java.lang.Runtime.loadLibrary0(Runtime.java:870)
	at java.lang.System.loadLibrary(System.java:1122)
	at org.bytedeco.javacpp.Loader.loadLibrary(Loader.java:1483)
	at org.bytedeco.javacpp.Loader.load(Loader.java:1186)
	at org.bytedeco.javacpp.Loader.load(Loader.java:1036)
	at org.bytedeco.ffmpeg.global.avutil.<clinit>(avutil.java:12)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:348)
	at org.bytedeco.javacpp.Loader.load(Loader.java:1103)
	at org.bytedeco.javacpp.Loader.load(Loader.java:1052)
	at com.demo.VideoConverter.ffmpegConvert2Mp4(VideoConverter.java:33)
	at com.demo.VideoConverter.main(VideoConverter.java:121)
Caused by: java.lang.UnsatisfiedLinkError: no avutil in java.library.path
	at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1867)
	at java.lang.Runtime.loadLibrary0(Runtime.java:870)
	at java.lang.System.loadLibrary(System.java:1122)
	at org.bytedeco.javacpp.Loader.loadLibrary(Loader.java:1483)
	at org.bytedeco.javacpp.Loader.load(Loader.java:1137)
	... 8 more

     <!--ffmpeg依赖-->
		<dependency>
			<groupId>org.bytedeco</groupId>
			<artifactId>javacv</artifactId>
			<version>1.5.1</version>
		</dependency>
		<!--windows ffmpeg-->
		<dependency>
			<groupId>org.bytedeco</groupId>
			<artifactId>ffmpeg</artifactId>
			<version>4.1.3-1.5.1</version>
		</dependency>

解决： pom依赖及版本问题 更换为上边正确的依赖

2.3 报错 javacpp/cache/ffmpeg-5.0-1.5.7-linux-x86_64.jar/org/bytedeco/ffmpeg/linux-x86_64/libjniavdevice.so libasoud.so.2: cannot open shared object

解决： 安装libasoud.so

yum install alsa-lib-devel

2.4 报错 avacpp/cache/ffmpeg-4.2.2-1.5.3-linux-x86_64.jar/org/bytedeco/ffmpeg/linux-x86_64/libjniavdevice.so: libxcb.so.1: cannot open shared object file: No such file or directory

完整报错如下

caused by: java.lang.UnsatisfiedLinkError: java.lang.UnsatisfiedLinkError: /root/.javacpp/cache/ffmpeg-4.2.2-1.5.3-linux-x86_64.jar/org/bytedeco/ffmpeg/linux-x86_64/libjniavdevice.so: libxcb.so.1: cannot open shared object file: No such file or directory 
    at java.lang.ClassLoader$NativeLibrary.load(Native Method) 
    at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1934)       
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1817) 
    at java.lang.Runtime.load0(Runtime.java:809) 
    at java.lang.System.load(System.java:1088) 
    at org.bytedeco.javacpp.Loader.loadLibrary(Loader.java:1581)   		
    ... 18 more

解决： 安装libxcb.so

dnf/yum/apt-get install libxcb

参考

• https://blog.csdn.net/nankangkang/article/details/124352556
• https://github.com/bytedeco/javacv/issues/1431