Tuan Nghia Nguyen
0925aa1d63
getImage() previously held _mutex across the 4K NV12->BGR sws_scale in avframeToCVMat, blocking the decoder callback (onVideoFrame) for 100-300ms per frame. Under multi-camera load this cascaded into 5-21s frame stalls and STALE PTS events in the log. - avframeToCVMat: drop outer _mutex. NV12/YUV420P paths touch no shared state; avframeAnyToCvmat still locks internally for swsCtx. - getImage: split into two short locked phases with the BGR conversion unlocked between them. Decoder callbacks can push new frames and run the CUDA HW capture path in parallel with the reader's conversion. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>