java实现flv转mp4/视频格式转换

• 引言

今天在开发过程中，突然遇到给前端flv格式视频还播放不了，flv在开发印象中就是跟mp4格式差不多，本地静态视频资源，怎么还就播放不了，为此只能特别做下视频转换。

• How to do

1.提前引入包

        <!--视频多媒体工具包 包含 FFmpeg、OpenCV--><dependency><groupId>org.bytedeco</groupId><artifactId>javacv-platform</artifactId><version>1.5.3</version></dependency>

2.逻辑实现

/*** flv转mp4** @param inputFile  flv地址* @param outputFile mp4地址* @throws IOException* @throws InterruptedException*/public static void flv2Mp4(String inputFile, String outputFile) throws IOException{long start = System.currentTimeMillis();FFmpegFrameGrabber grabber = new FFmpegFrameGrabber(inputFile);grabber.start();FFmpegFrameRecorder recorder = new FFmpegFrameRecorder(outputFile, grabber.getImageWidth(), grabber.getImageHeight());recorder.setVideoCodec(avcodec.AV_CODEC_ID_H264);recorder.setFrameRate(grabber.getFrameRate());recorder.start();Frame frame;while ((frame = grabber.grabFrame()) != null) {recorder.record(frame);}recorder.stop();grabber.stop();log.info("flv转mp4 占用时长(毫秒): {} ", (System.currentTimeMillis() - start));}