KVFCodec

2026-07-26 22:35:06 +08:00
commit c92cf914fc
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+package org.kne.codec.kvf;
+
+import org.jcodec.api.FrameGrab;
+import org.jcodec.api.JCodecException;
+import org.jcodec.common.io.FileChannelWrapper;
+import org.jcodec.common.io.SeekableByteChannel;
+import org.jcodec.common.model.Picture;
+import org.jcodec.containers.mp4.demuxer.MP4Demuxer;
+import org.jcodec.scale.AWTUtil;
+
+import javax.imageio.ImageIO;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.PrintStream;
+import java.nio.channels.FileChannel;
+import java.nio.charset.StandardCharsets;
+import java.util.zip.ZipFile;
+
+/**
+ * JCodec 最小化 Demo：读取 MP4 文件，解码每一帧为 BufferedImage
+ * 
+ * 用法：java JCodecDemo /path/to/video.mp4
+ */
+public class H264ToKVF {
+
+    public static void main(String[] args) throws IOException, JCodecException {
+        // 1. 注册 KIF 插件
+        org.kne.codec.kif.KIFImageReaderSpi.register();
+        org.kne.codec.kif.KIFImageWriterSpi.register();
+        System.setOut(new PrintStream(System.out, true, StandardCharsets.UTF_8));
+        System.setErr(new PrintStream(System.err, true, StandardCharsets.UTF_8));
+        if (args.length < 1) {
+            System.err.println("用法: java JCodecDemo <video.mp4>");
+            System.exit(1);
+        }
+
+        File inputFile = new File(args[0]);
+        if (!inputFile.exists()) {
+            System.err.println("文件不存在: " + inputFile.getAbsolutePath());
+            System.exit(1);
+        }
+        File outputFile=new File("output.kvf");
+       
+        System.out.println("🎬 开始转码: " + inputFile.getName());
+
+        // 1. 打开 FileChannel，向上转型为 SeekableByteChannel
+        try ( KVFOutputStream kvo=new KVFOutputStream(new FileOutputStream(outputFile))){
+        try (FileInputStream fis = new FileInputStream(inputFile);
+             FileChannel fileChannel = fis.getChannel()) {
+            
+            // 关键：用 SeekableByteChannel 类型接收
+            SeekableByteChannel channel =new FileChannelWrapper( fileChannel);
+            // 2. 创建帧抓取器
+            MP4Demuxer demux=MP4Demuxer.createMP4Demuxer(channel);
+            // 3. 逐帧解码
+            int frameCount = 0; 
+            long startTime = System.currentTimeMillis();
+
+            Picture picture;
+          /*  while ((picture = grab.getNativeFrame()) != null) {
+                frameCount++;
+
+                   System.out.printf("  已解码 %d 帧...\n", frameCount);
+                   kvo.writeFrame(0, frameCount, picture, "kif");
+            }*/
+
+            long elapsed = System.currentTimeMillis() - startTime;
+            System.out.printf("✅ 转码完成！共 %d 帧，耗时 %dms\n", frameCount, elapsed);
+        }
+        }
+    }
+
+}