个人技术分享

一、maven依赖

使用javacv ffmpeg并指定classifier之后，就不需要额外安装ffmpeg软件（jar包中已经内置）了。

• 全量依赖包（不推荐）安装包总大小超过1G

        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacv-platform</artifactId>
            <version>${javacv.version}</version>
        </dependency>

• 最小化安装

可使用mvn enforcer:display-info 查看当前操作系统信息

<javacv.version>1.5.9</javacv.version>

    <dependencies>
        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>javacv</artifactId>
            <version>${javacv.version}</version>
        </dependency>
        <dependency>
            <groupId>org.bytedeco</groupId>
            <artifactId>ffmpeg</artifactId>
            <version>6.0-${javacv.version}</version>
            <classifier>linux-x86_64</classifier>
        </dependency>
    </dependencies>

    <profiles>
        <profile>
            <id>Windows</id>
            <activation>
                <os>
                    <!-- mvn enforcer:display-info -->
                    <family>windows</family>
                </os>
            </activation>
            <dependencies>
                <dependency>
                    <groupId>org.bytedeco</groupId>
                    <artifactId>ffmpeg</artifactId>
                    <version>6.0-${javacv.version}</version>
                    <classifier>windows-x86_64</classifier>
                </dependency>
            </dependencies>
        </profile>
        <profile>
           <id>Mac</id>
           <activation>
               <os>
                   <!-- mvn enforcer:display-info -->
                   <family>mac</family>
               </os>
           </activation>
           <dependencies>
               <dependency>
                   <groupId>org.bytedeco</groupId>
                   <artifactId>ffmpeg</artifactId>
                   <version>6.0-${javacv.version}</version>
                   <classifier>macosx-x86_64</classifier>
               </dependency>
           </dependencies>
       </profile>
    </profiles>

二、示例代码

1. 获取视频时长

    public static void videoDuration(String videoFilePath) {
        try (FFmpegFrameGrabber frameGrabber = new FFmpegFrameGrabber(videoFilePath)) {
            frameGrabber.start();
            int duration = frameGrabber.getLengthInVideoFrames()/ (int) frameGrabber.getFrameRate();
            System.out.println(duration);
            frameGrabber.stop();
        } catch (FrameGrabber.Exception e) {
            e.printStackTrace();
        }
    }

三、小技巧

• 日志级别

    static {
        avutil.av_log_set_level(avutil.AV_LOG_DEBUG);
        FFmpegLogCallback.set();
    }