iOS crash on Pose tracking demo EXC_BAD_ACCESS

System information

• OS Platform and Distribution (e.g., Linux Ubuntu 20.04): iOS 14.8
• Target Platform: iOS 14.8
• Mobile Device (if the target is Android or iOS): iPhone XS
• MediaPipeUnityPlugin version or commit id: efc7664e3ed5d997ee618c364bd2256896a43aae
• Bazel version: 4.2.1
• GCC/G++ version:
• Android NDK version (if the target platform is Android):
• Xcode version (if the target platform is iOS): 13.1

Describe the current behavior App crash after running for while. The crash timing is random. Sometime 10 mins but sometimes can run for an hour.

Steps to reproduce the issue

1. Choose pose tracking demo and run on the device for long period of time.
2. Using front camera and choose 640x480 resolution
3. Target the camera on a looping video that have human dance.

Full logs See https://docs.unity3d.com/Manual/LogFiles.html

Additional Context The above behaviour is running the demo in Async mode. Therefore, I have also tested on Sync mode. It seems the error will not occur. The demo can run for more than 2 hours in Sync mode

From the callback stack trace, I found out this is caused by the source code from mediapipe. I think Sync mode can prevent to trigger the last element in mirrors_ so the bug cannot be triggered.

mediapipe/framework/output_stream_manager.cc line 191

 // mediapipe/framework/output_stream_manager.cc line 191 from https://github.com/google/mediapipe/
  for (int idx = 0; idx < mirror_count; ++idx) {
    const Mirror& mirror = mirrors_[idx];
    if (add_packets) {
      // If the stream is the last element in mirrors_, moves packets from
      // output_queue_. Otherwise, copies the packets.
      if (idx == mirror_count - 1) {
        mirror.input_stream_handler->MovePackets(mirror.id,
                                                 packets_to_propagate);
      } else {
        mirror.input_stream_handler->AddPackets(mirror.id,
                                                *packets_to_propagate);
      }
    }
    if (set_bound) {
      mirror.input_stream_handler->SetNextTimestampBound(mirror.id,
                                                         next_timestamp_bound);
    }
  }

Do you have any idea how to fix it? I would love to contribute in it. By the way, nice project. It helps me a lot.

[homuler]

@siisee11 Thanks! I’ll wait another week or two, and if there are no reports, I’ll merge it into master.

[laukaho]

I also tested 78b2d1a and run on IPad Mini 6 for 2 hours. The crash didn’t happened. Let’s see if there are more testing result in the future. Thanks for the fix @homuler