Fix: Cannot read properties of undefined (reading 'width') in Video G…

…T job (#9095) Fixed a regression In a GT job created from a video, which led to an error: *Cannot read properties of undefined (reading 'width') while navigating through frames
cvat-ai · Feb 13, 2025 · a8ce52b · a8ce52b
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diff --git a/changelog.d/20250212_154930_klakhov_frame_regression.md b/changelog.d/20250212_154930_klakhov_frame_regression.md
@@ -0,0 +1,4 @@
+### Fixed
+
+- Error: Cannot read properties of undefined (reading 'width') that occurs when changing frames in a video-based GT job
+  (<https://github.com/cvat-ai/cvat/pull/9095>)
diff --git a/cvat-core/src/frames.ts b/cvat-core/src/frames.ts
@@ -898,7 +898,9 @@ export async function getFrame(
     await refreshJobCacheIfOutdated(jobID);
 
     const framesMetaData = await frameDataCache[jobID].getMeta();
-    const frameMeta = framesMetaData.frames[frame - jobStartFrame];
+    const dataFrameNumber = framesMetaData.getDataFrameNumber(frame - jobStartFrame);
+    const frameIndex = framesMetaData.getFrameIndex(dataFrameNumber);
+    const frameMeta = framesMetaData.frames[frameIndex];
     frameDataCache[jobID].provider.setRenderSize(frameMeta.width, frameMeta.height);
     frameDataCache[jobID].decodeForward = isPlaying;
     frameDataCache[jobID].forwardStep = step;