问题
Can anyone recommend a Java library that would allow me to create a video programmatically? Specifically, it would do the following:
- take a series of BufferedImages as the frames
- allow a background WAV/MP3 to be added
- allow 'incidental' WAV/MP3s to be added at arbitrarily, programmatically specified points
- output the video in a common format (MPEG etc)
Can anybody recommend anything? For the picture/sound mixing, I'd even live with something that took a series of frames, and for each frame I had to supply the raw bytes of uncompressed sound data associated with that frame.
P.S. It doesn't even have to be a "third party library" as such if the Java Media Framework has the calls to achieve the above, but from my sketchy memory I have a feeling it doesn't.
回答1:
I've used the code mentioned below to successfully perform items 1, 2, and 4 on your requirements list in pure Java. It's worth a look and you could probably figure out how to include #3.
http://www.randelshofer.ch/blog/2010/10/writing-quicktime-movies-in-pure-java/
回答2:
I found a tool called ffmpeg which can convert multimedia files form one format to another. There is a filter called libavfilter in ffmpeg which is the substitute for vhook which allows the video/audio to be modified or examined between the decoder and the encoder. I think it should be possible to input raw frames and generate video. I researched on any java implementation of ffmpeg and found the page titled "Getting Started with FFMPEG-JAVA" which is a JAVA wrapper around FFMPEG using JNA.
回答3:
You can try a pure Java codec library called JCodec.
It has a very basic H.264 ( AVC ) encoder and MP4 muxer. Here's a full sample code taken from the their samples -- TranscodeMain.
private static void png2avc(String pattern, String out) throws IOException {
FileChannel sink = null;
try {
sink = new FileOutputStream(new File(out)).getChannel();
H264Encoder encoder = new H264Encoder();
RgbToYuv420 transform = new RgbToYuv420(0, 0);
int i;
for (i = 0; i < 10000; i++) {
File nextImg = new File(String.format(pattern, i));
if (!nextImg.exists())
continue;
BufferedImage rgb = ImageIO.read(nextImg);
Picture yuv = Picture.create(rgb.getWidth(), rgb.getHeight(), ColorSpace.YUV420);
transform.transform(AWTUtil.fromBufferedImage(rgb), yuv);
ByteBuffer buf = ByteBuffer.allocate(rgb.getWidth() * rgb.getHeight() * 3);
ByteBuffer ff = encoder.encodeFrame(buf, yuv);
sink.write(ff);
}
if (i == 1) {
System.out.println("Image sequence not found");
return;
}
} finally {
if (sink != null)
sink.close();
}
}
This sample is more sophisticated and actually shows muxing of encoded frames into MP4 file:
private static void prores2avc(String in, String out, ProresDecoder decoder, RateControl rc) throws IOException {
SeekableByteChannel sink = null;
SeekableByteChannel source = null;
try {
sink = writableFileChannel(out);
source = readableFileChannel(in);
MP4Demuxer demux = new MP4Demuxer(source);
MP4Muxer muxer = new MP4Muxer(sink, Brand.MOV);
Transform transform = new Yuv422pToYuv420p(0, 2);
H264Encoder encoder = new H264Encoder(rc);
MP4DemuxerTrack inTrack = demux.getVideoTrack();
CompressedTrack outTrack = muxer.addTrackForCompressed(TrackType.VIDEO, (int) inTrack.getTimescale());
VideoSampleEntry ine = (VideoSampleEntry) inTrack.getSampleEntries()[0];
Picture target1 = Picture.create(ine.getWidth(), ine.getHeight(), ColorSpace.YUV422_10);
Picture target2 = null;
ByteBuffer _out = ByteBuffer.allocate(ine.getWidth() * ine.getHeight() * 6);
ArrayList<ByteBuffer> spsList = new ArrayList<ByteBuffer>();
ArrayList<ByteBuffer> ppsList = new ArrayList<ByteBuffer>();
Packet inFrame;
int totalFrames = (int) inTrack.getFrameCount();
long start = System.currentTimeMillis();
for (int i = 0; (inFrame = inTrack.getFrames(1)) != null && i < 100; i++) {
Picture dec = decoder.decodeFrame(inFrame.getData(), target1.getData());
if (target2 == null) {
target2 = Picture.create(dec.getWidth(), dec.getHeight(), ColorSpace.YUV420);
}
transform.transform(dec, target2);
_out.clear();
ByteBuffer result = encoder.encodeFrame(_out, target2);
if (rc instanceof ConstantRateControl) {
int mbWidth = (dec.getWidth() + 15) >> 4;
int mbHeight = (dec.getHeight() + 15) >> 4;
result.limit(((ConstantRateControl) rc).calcFrameSize(mbWidth * mbHeight));
}
spsList.clear();
ppsList.clear();
H264Utils.encodeMOVPacket(result, spsList, ppsList);
outTrack.addFrame(new MP4Packet((MP4Packet) inFrame, result));
if (i % 100 == 0) {
long elapse = System.currentTimeMillis() - start;
System.out.println((i * 100 / totalFrames) + "%, " + (i * 1000 / elapse) + "fps");
}
}
outTrack.addSampleEntry(H264Utils.createMOVSampleEntry(spsList, ppsList));
muxer.writeHeader();
} finally {
if (sink != null)
sink.close();
if (source != null)
source.close();
}
}
回答4:
Why not use FFMPEG?
There seems to be a Java wrapper for it:
http://fmj-sf.net/ffmpeg-java/getting_started.php
Here is an example of how to compile various media sources into one video with FFMPEG:
http://howto-pages.org/ffmpeg/#multiple
And, finally, the docs:
http://ffmpeg.org/ffmpeg.html
回答5:
Try JavaFX.
JavaFX includes support for rendering of images in multiple formats and support for playback of audio and video on all platforms where JavaFX is supported.
Here is a tutorial on manipulating images
Here is a tutorial on creating slideshows, timelines and scenes.
Here is FAQ on adding sounds.
Most of these are on JavaFX 1.3. Now JavaFX 2.0 is out.
来源：https://stackoverflow.com/questions/9334062/recommended-java-library-for-creating-a-video-programmatically