JavaCV FFmpegFrameRecorder hangs in avcodec_free_context with h264_nvenc (multi-threaded, Ubuntu)

[lustre02]

Problem
recorder.stop() / close() hangs indefinitely in native avcodec_free_context. Another thread also hangs in avcodec_send_frame. Using h264_nvenc encoder in a multi-threaded service.
Environment
JavaCV 1.5.11
Ubuntu
NVIDIA Driver 550.144.03, CUDA 12.4
Java 17
Multi-threaded usage (multiple FFmpegFrameRecorder instances)
Stack traces
Thread 1 (stuck in avcodec_free_context):
"slice-task-service-impl-executor-1" #105 prio=5 os_prio=0 cpu=19964999.84ms elapsed=20653.39s tid=0x00007f293c0040d0 nid=0xd0 runnable [0x00007f28eecbd000] java.lang.Thread.State: RUNNABLE at org.bytedeco.ffmpeg.global.avcodec.avcodec_free_context(Native Method) at org.bytedeco.javacv.FFmpegFrameRecorder.releaseUnsafe(FFmpegFrameRecorder.java:232) - locked <0x000010005ca17380> (a org.bytedeco.javacv.FFmpegFrameRecorder) at org.bytedeco.javacv.FFmpegFrameRecorder.release(FFmpegFrameRecorder.java:203) - locked <0x0000100000636938> (a java.lang.Class for org.bytedeco.ffmpeg.global.avcodec) at org.bytedeco.javacv.FFmpegFrameRecorder.stop(FFmpegFrameRecorder.java:1012) at org.bytedeco.javacv.FrameRecorder.close(FrameRecorder.java:439) at com.chruix.media.service.Impl.SliceTaskServiceImpl.process(SliceTaskServiceImpl.java:199) at com.chruix.media.service.Impl.SliceTaskServiceImpl.process(SliceTaskServiceImpl.java:37) at com.chruix.media.service.ITaskService.lambda$post$0(ITaskService.java:56)

Thread 2 (stuck in avcodec_send_frame):
"video-task-service-impl-executor-3" #331 prio=5 os_prio=0 cpu=15556.58ms elapsed=19881.08s tid=0x00007f292c4f3ea0 nid=0x691 runnable [0x00007f28501fd000] java.lang.Thread.State: RUNNABLE at org.bytedeco.ffmpeg.global.avcodec.avcodec_send_frame(Native Method) at org.bytedeco.javacv.FFmpegFrameRecorder.recordImage(FFmpegFrameRecorder.java:1118) - locked <0x00001000480c7a60> (a org.bytedeco.javacv.FFmpegFrameRecorder) at org.bytedeco.javacv.FFmpegFrameRecorder.record(FFmpegFrameRecorder.java:1025) - locked <0x00001000480c7a60> (a org.bytedeco.javacv.FFmpegFrameRecorder) at org.bytedeco.javacv.FFmpegFrameRecorder.record(FFmpegFrameRecorder.java:1018) at com.chruix.media.service.Impl.VideoTaskServiceImpl.processVideo(VideoTaskServiceImpl.java:91) at com.chruix.media.service.Impl.VideoTaskServiceImpl.process(VideoTaskServiceImpl.java:171) at com.chruix.media.service.Impl.VideoTaskServiceImpl.process(VideoTaskServiceImpl.java:41) at com.chruix.media.service.ITaskService.lambda$post$0(ITaskService.java:56)

What I tried
Upgraded to JavaCV 1.5.11
Driver/CUDA versions seem compatible

Question
Any fix or workaround for this NVENC-related hang? Thanks.