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MosaicExample.java
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MosaicExample.java
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package examples;
import com.github.kokorin.jaffree.LogLevel;
import com.github.kokorin.jaffree.StreamType;
import com.github.kokorin.jaffree.ffmpeg.FFmpeg;
import com.github.kokorin.jaffree.ffmpeg.FFmpegResult;
import com.github.kokorin.jaffree.ffmpeg.Frame;
import com.github.kokorin.jaffree.ffmpeg.FrameConsumer;
import com.github.kokorin.jaffree.ffmpeg.FrameInput;
import com.github.kokorin.jaffree.ffmpeg.FrameOutput;
import com.github.kokorin.jaffree.ffmpeg.FrameProducer;
import com.github.kokorin.jaffree.ffmpeg.ImageFormats;
import com.github.kokorin.jaffree.ffmpeg.Stream;
import com.github.kokorin.jaffree.ffmpeg.UrlInput;
import com.github.kokorin.jaffree.ffmpeg.UrlOutput;
import com.github.kokorin.jaffree.ffprobe.FFprobe;
import com.github.kokorin.jaffree.ffprobe.FFprobeResult;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.ImageObserver;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Deque;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CopyOnWriteArrayList;
/**
* Note: for some reason ffmpeg 3.3.1 fails when using amix or amerge filters (in this example)
* Use ffmpeg 4.0 at least, amix works (while amerge still fails)
*/
public class MosaicExample {
private final Path ffmpegBin;
private final List<String> inputs;
private final int sampleRate = 44100;
private final int frameRate = 25;
public static final Logger LOGGER = LoggerFactory.getLogger(MosaicExample.class);
public MosaicExample(String ffmpegBin, List<String> inputs) {
this.ffmpegBin = Paths.get(ffmpegBin);
this.inputs = inputs;
}
public void execute() {
final List<FFmpegResult> results = new CopyOnWriteArrayList<>();
List<FrameIterator> frameIterators = new ArrayList<>();
for (int i = 0; i < inputs.size(); i++) {
String input = inputs.get(i);
boolean hasAudioStream = false;
// We must test input for audio stream
// Other corner-cases (no video stream, multiple audio stream are not considered)
FFprobeResult probeResult = FFprobe.atPath(ffmpegBin)
.setShowStreams(true)
.setInput(Paths.get(input))
.execute();
for (com.github.kokorin.jaffree.ffprobe.Stream stream : probeResult.getStreams()) {
if (StreamType.AUDIO == stream.getCodecType()) {
hasAudioStream = true;
break;
}
}
FrameIterator frameIterator = new FrameIterator();
frameIterators.add(frameIterator);
final FFmpeg ffmpeg = FFmpeg.atPath(ffmpegBin)
.addInput(UrlInput
.fromUrl(input)
.setDuration(15_000))
.addOutput(FrameOutput
.withConsumer(frameIterator.getConsumer())
.setFrameRate(frameRate)
.addArguments("-ac", "1")
.addArguments("-ar", Integer.toString(sampleRate))
)
.setContextName("input" + i);
if (!hasAudioStream) {
ffmpeg
.addInput(
UrlInput.fromUrl("anullsrc")
.setFormat("lavfi")
)
.addArgument("-shortest");
}
Thread ffmpegThread = new Thread(new Runnable() {
@Override
public void run() {
FFmpegResult result = ffmpeg.execute();
results.add(result);
}
}, "Reader-" + i + "-main");
ffmpegThread.setDaemon(true);
ffmpegThread.start();
}
FrameProducer frameProducer = produceMosaic(frameIterators);
FFmpegResult mosaicResult = FFmpeg.atPath(ffmpegBin)
.addInput(
FrameInput
.withProducer(frameProducer, ImageFormats.BGR24, 5_000L)
.setFrameRate(frameRate)
)
.setOverwriteOutput(true)
.setLogLevel(LogLevel.TRACE)
.addOutput(UrlOutput
.toUrl("mosaic.mp4")
//.addMap(0)
)
.addArguments("-filter_complex", "amix=inputs=" + inputs.size())
.setContextName("result")
.execute();
}
private FrameProducer produceMosaic(final List<FrameIterator> frameIterators) {
final int rows = (int) Math.round(Math.sqrt(frameIterators.size()));
final int columns = (int) Math.ceil(1.0 * frameIterators.size() / rows);
return new FrameProducer() {
private final int elementWidth = 320;
private final int elementHeight = 240;
private final int mosaicWidth = columns * elementWidth;
private final int mosaicHeight = rows * elementHeight;
private final long videoFrameDuration = 1000 / frameRate;
private final Map<Integer, Deque<Frame>> audioQueues = new HashMap<>();
private long timecode = 0;
private final Frame[] nextVideoFrames = new Frame[frameIterators.size()];
private long nextVideoFrameTimecode = 0;
private long nextAudioFrameTimecode = 0;
@Override
public List<Stream> produceStreams() {
List<Stream> streams = new ArrayList<>();
streams.add(
new Stream()
.setId(0)
.setType(Stream.Type.VIDEO)
.setTimebase(1000L)
.setWidth(mosaicWidth)
.setHeight(mosaicHeight)
);
// We copy all audio streams to output and merge tham with amerge filter
for (int i = 0; i < frameIterators.size(); i++) {
streams.add(
new Stream()
.setId(1 + i)
.setType(Stream.Type.AUDIO)
.setTimebase((long) sampleRate)
.setChannels(1)
.setSampleRate(sampleRate)
);
}
return streams;
}
@Override
public Frame produce() {
Frame result = null;
if (nextVideoFrameTimecode <= timecode) {
if (nextVideoFrameTimecode == 0) {
readNextVideoFrames(nextVideoFrameTimecode);
}
result = produceVideoFrame(nextVideoFrames);
// We have to read video frames ahead, otherwise we will have no audio frames read
readNextVideoFrames(nextVideoFrameTimecode);
} else if (nextAudioFrameTimecode <= timecode) {
result = produceAudioFrame();
}
timecode = Math.min(nextVideoFrameTimecode, nextAudioFrameTimecode);
return result;
}
public Frame produceVideoFrame(Frame[] videoFrames) {
BufferedImage mosaic = new BufferedImage(mosaicWidth, mosaicHeight, BufferedImage.TYPE_3BYTE_BGR);
Graphics mosaicGraphics = mosaic.getGraphics();
mosaicGraphics.setColor(new Color(0));
mosaicGraphics.fillRect(0, 0, mosaicWidth, mosaicHeight);
boolean atLeastHasOneElement = false;
for (int i = 0; i < videoFrames.length; i++) {
Frame videoFrame = videoFrames[i];
if (videoFrame == null) {
continue;
}
atLeastHasOneElement = true;
BufferedImage element = videoFrame.getImage();
int row = i / columns;
int column = i % columns;
ImageObserver observer = new ImageObserver() {
@Override
public boolean imageUpdate(Image img, int infoflags, int x, int y, int width, int height) {
return false;
}
};
int dx1 = column * elementWidth;
int dy1 = row * elementHeight;
int dx2 = dx1 + elementWidth;
int dy2 = dy1 + elementHeight;
mosaicGraphics.drawImage(element,
dx1, dy1, dx2, dy2,
0, 0, element.getWidth(), element.getHeight(),
observer
);
}
if (!atLeastHasOneElement) {
return null;
}
Frame result = Frame.createVideoFrame(0, nextVideoFrameTimecode, mosaic);
nextVideoFrameTimecode += videoFrameDuration;
return result;
}
private Frame produceAudioFrame() {
long minPts = Long.MAX_VALUE;
long nextPts = Long.MAX_VALUE;
int minI = -1;
for (int i = 0; i < frameIterators.size(); i++) {
Deque<Frame> aQueue = audioQueues.get(i);
Frame frame = aQueue.peekFirst();
if (frame == null) {
continue;
}
long queuePts = frame.getPts();
if (queuePts < minPts) {
nextPts = minPts;
minPts = queuePts;
minI = i;
continue;
}
if (queuePts < nextPts) {
nextPts = queuePts;
}
}
if (minI == -1) {
return null;
}
Frame aFrame = audioQueues.get(minI).pollFirst();
if (aFrame == null) {
return null;
}
aFrame = Frame.createAudioFrame(1 + minI, aFrame.getPts(), aFrame.getSamples());
if (nextPts != Long.MAX_VALUE) {
nextAudioFrameTimecode = 1000L * nextPts / sampleRate;
} else {
nextAudioFrameTimecode = nextVideoFrameTimecode;
}
return aFrame;
}
// All video input streams have forced frameRate, so we know that in every stream
// frames will occur with the same timestamp
private void readNextVideoFrames(long videoTs) {
for (int i = 0; i < frameIterators.size(); i++) {
FrameIterator iter = frameIterators.get(i);
if (!iter.hasNext) {
nextVideoFrames[i] = null;
}
while (iter.hasNext) {
Frame frame = iter.next();
if (frame == null) {
break;
}
Stream stream = iter.getStream(frame.getStreamId());
if (stream == null) {
break;
}
switch (stream.getType()) {
case VIDEO:
nextVideoFrames[i] = frame;
break;
case AUDIO:
Deque<Frame> aQueue = audioQueues.get(i);
if (aQueue == null) {
aQueue = new LinkedList<>();
audioQueues.put(i, aQueue);
}
aQueue.addLast(frame);
break;
}
long frameTs = 1000L * frame.getPts() / stream.getTimebase();
if (frameTs >= videoTs) {
break;
}
}
}
}
};
}
public static void main(String[] args) {
Iterator<String> argIter = Arrays.asList(args).iterator();
String ffmpegBin = null;
List<String> inputs = new ArrayList<>();
while (argIter.hasNext()) {
String arg = argIter.next();
if ("-ffmpeg_bin".equals(arg)) {
ffmpegBin = argIter.next();
} else {
inputs.add(arg);
}
}
if (ffmpegBin == null || inputs.isEmpty()) {
System.err.println("Arguments: -ffmpeg_bin </path/to/ffmpeg/bin>");
return;
}
new MosaicExample(ffmpegBin, inputs).execute();
}
public static class FrameIterator implements Iterator<Frame> {
private volatile boolean hasNext = true;
private volatile Frame next = null;
private volatile List<Stream> tracks;
private final FrameConsumer consumer = new FrameConsumer() {
@Override
public void consumeStreams(List<Stream> tracks) {
FrameIterator.this.tracks = tracks;
}
@Override
public void consume(Frame frame) {
while (next != null) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
LOGGER.warn("Exception while supplying frame", e);
}
}
hasNext = frame != null;
next = frame;
}
};
@Override
public boolean hasNext() {
waitForNextFrame();
return hasNext;
}
@Override
public Frame next() {
waitForNextFrame();
Frame result = next;
next = null;
return result;
}
@Override
public void remove() {
throw new UnsupportedOperationException("remove");
}
public FrameConsumer getConsumer() {
return consumer;
}
public List<Stream> getTracks() {
return tracks;
}
public Stream getStream(int id) {
for (Stream stream : tracks) {
if (stream.getId() == id) {
return stream;
}
}
return null;
}
private void waitForNextFrame() {
while (hasNext && next == null) {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
LOGGER.warn("Exception while waiting for frame", e);
}
}
}
}
}