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Fix VideoRecorderAppState garbled output on window resize #2608

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Fix VideoRecorderAppState garbled output on window resize #2608

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bc4e690
Initial plan
Copilot Feb 11, 2026
4fc1ff3
Implement reshape() method to handle window resizing in VideoRecorder…
Copilot Feb 11, 2026
af078eb
Apply same reshape() fix to Android VideoRecorderAppState
Copilot Feb 11, 2026
99c9f18
Address code review feedback: add timeout and improve clarity
Copilot Feb 11, 2026
f781c98
Improve exception logging to include stack trace
Copilot Feb 11, 2026
1e0bb05
Fix blocking main loop in reshape - use flag-based async approach
Copilot Feb 11, 2026
53e97fd
Refactor to use per-resolution workers with automatic eviction
Copilot Feb 11, 2026
80f89d3
Fix race condition in getWorker using computeIfAbsent
Copilot Feb 11, 2026
86fc9c3
Add unit tests for VideoRecorderAppState resize functionality
Copilot Feb 11, 2026
fd46362
Simplify VideoRecorderAppState unit tests to avoid mock dependencies
Copilot Feb 12, 2026
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48 changes: 47 additions & 1 deletion jme3-android/src/main/java/com/jme3/app/state/VideoRecorderAppState.java
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Original file line number Diff line number Diff line change
Expand Up @@ -232,9 +232,12 @@ private class VideoProcessor implements SceneProcessor {
private LinkedBlockingQueue<WorkItem> usedItems = new LinkedBlockingQueue<>();
private MjpegFileWriter writer;
private boolean fastMode = true;
private boolean reshapePending = false;
private int newWidth;
private int newHeight;

public void addImage(Renderer renderer, FrameBuffer out) {
if (freeItems == null) {
if (freeItems == null || reshapePending) {
return;
}
try {
Expand Down Expand Up @@ -284,6 +287,14 @@ public void initialize(RenderManager rm, ViewPort viewPort) {

@Override
public void reshape(ViewPort vp, int w, int h) {
if (this.width == w && this.height == h) {
return;
}

// Mark that reshape is pending and store new dimensions
this.newWidth = w;
this.newHeight = h;
this.reshapePending = true;
}

@Override
Expand All @@ -293,6 +304,41 @@ public boolean isInitialized() {

@Override
public void preFrame(float tpf) {
// Handle pending reshape if all work items are available
if (reshapePending && freeItems != null && freeItems.size() >= numCpus) {
// All work items are free, safe to reshape
this.width = newWidth;
this.height = newHeight;
this.reshapePending = false;

// Close the current writer and generate new filename for resized video
if (writer != null) {
try {
writer.finishAVI();
Logger.getLogger(VideoRecorderAppState.class.getName()).log(Level.INFO,
"Window resized from {0}x{1} to {2}x{3}. Previous recording saved to: {4}",
new Object[]{writer.width, writer.height, width, height, file.getAbsolutePath()});
} catch (Exception ex) {
Logger.getLogger(VideoRecorderAppState.class.getName()).log(Level.SEVERE, "Error closing video on reshape", ex);
}
writer = null;

// Generate a new filename for the resized video
String originalPath = file.getAbsolutePath();
int dotIndex = originalPath.lastIndexOf('.');
String basePath = dotIndex > 0 ? originalPath.substring(0, dotIndex) : originalPath;
String extension = dotIndex > 0 ? originalPath.substring(dotIndex) : ".avi";
file = new File(basePath + "-" + (System.currentTimeMillis() / 1000) + extension);
}

// Recreate work items with new dimensions
freeItems.clear();
usedItems.clear();
for (int i = 0; i < numCpus; i++) {
freeItems.add(new WorkItem(width, height));
}
}

if (null == writer) {
try {
writer = new MjpegFileWriter(file, width, height, framerate);
Expand Down
48 changes: 47 additions & 1 deletion jme3-desktop/src/main/java/com/jme3/app/state/VideoRecorderAppState.java
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Original file line number Diff line number Diff line change
Expand Up @@ -222,9 +222,12 @@ private class VideoProcessor implements SceneProcessor {
private LinkedBlockingQueue<WorkItem> freeItems;
private LinkedBlockingQueue<WorkItem> usedItems = new LinkedBlockingQueue<>();
private MjpegFileWriter writer;
private boolean reshapePending = false;
private int newWidth;
private int newHeight;

public void addImage(Renderer renderer, FrameBuffer out) {
if (freeItems == null) {
if (freeItems == null || reshapePending) {
return;
}
try {
Expand Down Expand Up @@ -269,6 +272,14 @@ public void initialize(RenderManager rm, ViewPort viewPort) {

@Override
public void reshape(ViewPort vp, int w, int h) {
if (this.width == w && this.height == h) {
return;
}

// Mark that reshape is pending and store new dimensions
this.newWidth = w;
this.newHeight = h;
this.reshapePending = true;
}

@Override
Expand All @@ -278,6 +289,41 @@ public boolean isInitialized() {

@Override
public void preFrame(float tpf) {
// Handle pending reshape if all work items are available
if (reshapePending && freeItems != null && freeItems.size() >= numCpus) {
// All work items are free, safe to reshape
this.width = newWidth;
this.height = newHeight;
this.reshapePending = false;

// Close the current writer and generate new filename for resized video
if (writer != null) {
try {
writer.finishAVI();
Logger.getLogger(VideoRecorderAppState.class.getName()).log(Level.INFO,
"Window resized from {0}x{1} to {2}x{3}. Previous recording saved to: {4}",
new Object[]{writer.width, writer.height, width, height, file.getAbsolutePath()});
} catch (Exception ex) {
Logger.getLogger(VideoRecorderAppState.class.getName()).log(Level.SEVERE, "Error closing video on reshape", ex);
}
writer = null;

// Generate a new filename for the resized video
String originalPath = file.getAbsolutePath();
int dotIndex = originalPath.lastIndexOf('.');
String basePath = dotIndex > 0 ? originalPath.substring(0, dotIndex) : originalPath;
String extension = dotIndex > 0 ? originalPath.substring(dotIndex) : ".avi";
file = new File(basePath + "-" + (System.currentTimeMillis() / 1000) + extension);
}

// Recreate work items with new dimensions
freeItems.clear();
usedItems.clear();
for (int i = 0; i < numCpus; i++) {
freeItems.add(new WorkItem(width, height));
}
}

if (null == writer) {
try {
writer = new MjpegFileWriter(file, width, height, framerate);
Expand Down