java 来自java android的图像序列的视频编码
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Video encode from sequence of images from java android
提问by captaindroid
I would like to encode video from sequence of images with java only in my current android project. I mean without any use of external tools such as NDK.
Also is there any availability of java libraries for encoding video from sequence of images ?
我想仅在我当前的 android 项目中使用 java 对图像序列中的视频进行编码。我的意思是不使用任何外部工具，例如 NDK。
是否还有用于从图像序列编码视频的 Java 库？
回答by Stanislav Vitvitskyy
You can use a pure java library called JCodec ( http://jcodec.org). It contains a primitive yet working H.264 ( AVC ) encoder and a fully functioning MP4 ( ISO BMF ) muxer.
Here's a CORRECTEDcode sample that uses low-level API:
您可以使用名为 JCodec ( http://jcodec.org)的纯 Java 库。它包含一个原始但有效的 H.264 (AVC) 编码器和一个功能齐全的 MP4 (ISO BMF) 多路复用器。
这是一个使用低级 API的更正代码示例：
public void imageToMP4(BufferedImage bi) {
// A transform to convert RGB to YUV colorspace
RgbToYuv420 transform = new RgbToYuv420(0, 0);
// A JCodec native picture that would hold source image in YUV colorspace
Picture toEncode = Picture.create(bi.getWidth(), bi.getHeight(), ColorSpace.YUV420);
// Perform conversion
transform.transform(AWTUtil.fromBufferedImage(bi), yuv);
// Create MP4 muxer
MP4Muxer muxer = new MP4Muxer(sink, Brand.MP4);
// Add a video track
CompressedTrack outTrack = muxer.addTrackForCompressed(TrackType.VIDEO, 25);
// Create H.264 encoder
H264Encoder encoder = new H264Encoder(rc);
// Allocate a buffer that would hold an encoded frame
ByteBuffer _out = ByteBuffer.allocate(ine.getWidth() * ine.getHeight() * 6);
// Allocate storage for SPS/PPS, they need to be stored separately in a special place of MP4 file
List<ByteBuffer> spsList = new ArrayList<ByteBuffer>();
List<ByteBuffer> ppsList = new ArrayList<ByteBuffer>();
// Encode image into H.264 frame, the result is stored in '_out' buffer
ByteBuffer result = encoder.encodeFrame(_out, toEncode);
// Based on the frame above form correct MP4 packet
H264Utils.encodeMOVPacket(result, spsList, ppsList);
// Add packet to video track
outTrack.addFrame(new MP4Packet(result, 0, 25, 1, 0, true, null, 0, 0));
// Push saved SPS/PPS to a special storage in MP4
outTrack.addSampleEntry(H264Utils.createMOVSampleEntry(spsList, ppsList));
// Write MP4 header and finalize recording
muxer.writeHeader();
}
You can download JCodec library from a project web site or via Maven, for this add the below snippet to your pom.xml:
您可以从项目网站或通过 Maven 下载 JCodec 库，为此将以下代码段添加到您的 pom.xml：
<dependency>
<groupId>org.jcodec</groupId>
<artifactId>jcodec</artifactId>
<version>0.1.3</version>
</dependency>
[UPDATE 1]Android users can use something like below to convert Android Bitmap object to JCodec native format:
[更新 1]Android 用户可以使用类似下面的方法将 Android Bitmap 对象转换为 JCodec 原生格式：
public static Picture fromBitmap(Bitmap src) {
Picture dst = Picture.create((int)src.getWidth(), (int)src.getHeight(), RGB);
fromBitmap(src, dst);
return dst;
}
public static void fromBitmap(Bitmap src, Picture dst) {
int[] dstData = dst.getPlaneData(0);
int[] packed = new int[src.getWidth() * src.getHeight()];
src.getPixels(packed, 0, src.getWidth(), 0, 0, src.getWidth(), src.getHeight());
for (int i = 0, srcOff = 0, dstOff = 0; i < src.getHeight(); i++) {
for (int j = 0; j < src.getWidth(); j++, srcOff++, dstOff += 3) {
int rgb = packed[srcOff];
dstData[dstOff] = (rgb >> 16) & 0xff;
dstData[dstOff + 1] = (rgb >> 8) & 0xff;
dstData[dstOff + 2] = rgb & 0xff;
}
}
}
