76 lines
2.8 KiB
Java
76 lines
2.8 KiB
Java
package org.kne.codec.kvf;
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import org.jcodec.api.FrameGrab;
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import org.jcodec.api.JCodecException;
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import org.jcodec.common.io.FileChannelWrapper;
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import org.jcodec.common.io.SeekableByteChannel;
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import org.jcodec.common.model.Picture;
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import org.jcodec.containers.mp4.demuxer.MP4Demuxer;
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import org.jcodec.scale.AWTUtil;
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import javax.imageio.ImageIO;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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import java.io.IOException;
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import java.io.PrintStream;
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import java.nio.channels.FileChannel;
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import java.nio.charset.StandardCharsets;
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import java.util.zip.ZipFile;
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/**
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* JCodec 最小化 Demo：读取 MP4 文件，解码每一帧为 BufferedImage
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*
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* 用法：java JCodecDemo /path/to/video.mp4
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*/
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public class H264ToKVF {
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public static void main(String[] args) throws IOException, JCodecException {
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// 1. 注册 KIF 插件
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org.kne.codec.kif.KIFImageReaderSpi.register();
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org.kne.codec.kif.KIFImageWriterSpi.register();
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System.setOut(new PrintStream(System.out, true, StandardCharsets.UTF_8));
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System.setErr(new PrintStream(System.err, true, StandardCharsets.UTF_8));
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if (args.length < 1) {
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System.err.println("用法: java JCodecDemo <video.mp4>");
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System.exit(1);
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}
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File inputFile = new File(args[0]);
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if (!inputFile.exists()) {
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System.err.println("文件不存在: " + inputFile.getAbsolutePath());
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System.exit(1);
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}
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File outputFile=new File("output.kvf");
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System.out.println("🎬 开始转码: " + inputFile.getName());
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// 1. 打开 FileChannel，向上转型为 SeekableByteChannel
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try ( KVFOutputStream kvo=new KVFOutputStream(new FileOutputStream(outputFile))){
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try (FileInputStream fis = new FileInputStream(inputFile);
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FileChannel fileChannel = fis.getChannel()) {
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// 关键：用 SeekableByteChannel 类型接收
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SeekableByteChannel channel =new FileChannelWrapper( fileChannel);
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// 2. 创建帧抓取器
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MP4Demuxer demux=MP4Demuxer.createMP4Demuxer(channel);
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// 3. 逐帧解码
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int frameCount = 0;
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long startTime = System.currentTimeMillis();
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Picture picture;
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/* while ((picture = grab.getNativeFrame()) != null) {
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frameCount++;
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System.out.printf(" 已解码 %d 帧...\n", frameCount);
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kvo.writeFrame(0, frameCount, picture, "kif");
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}*/
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long elapsed = System.currentTimeMillis() - startTime;
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System.out.printf("✅ 转码完成！共 %d 帧，耗时 %dms\n", frameCount, elapsed);
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}
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}
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}
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} |