javacv ffmpeg使用笔记 (补充中...)

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();}