crash while runing desktop/example/hand_tracking

[VeitchKyrie]

hand tracking will crash each time in runing with a double free issue, it seems there's something wrong with some kind of resource, BTW, my device is not equiped with webcam, so is it possible caused by no input stream?

GLOG_logtostderr=1 bazel-bin/mediapipe/examples/desktop/hand_tracking/hand_tracking_gpu   --calculator_graph_config_file=mediapipe/graphs/hand_tracking/hand_tracking_mobile.pbtxt
I20200702 10:19:39.963848 22054 demo_run_graph_main_gpu.cc:51] Get calculator graph config contents: # MediaPipe graph that performs hand tracking with TensorFlow Lite on GPU.
Used in the examples in
mediapipe/examples/android/src/java/com/mediapipe/apps/handtrackinggpu and
mediapipe/examples/ios/handtrackinggpu.

Images coming into and out of the graph.
input_stream: "input_video"
output_stream: "output_video"

Throttles the images flowing downstream for flow control. It passes through
the very first incoming image unaltered, and waits for downstream nodes
(calculators and subgraphs) in the graph to finish their tasks before it
passes through another image. All images that come in while waiting are
dropped, limiting the number of in-flight images in most part of the graph to
1. This prevents the downstream nodes from queuing up incoming images and data
excessively, which leads to increased latency and memory usage, unwanted in
real-time mobile applications. It also eliminates unnecessarily computation,
e.g., the output produced by a node may get dropped downstream if the
subsequent nodes are still busy processing previous inputs.
node {
  calculator: "FlowLimiterCalculator"
  input_stream: "input_video"
  input_stream: "FINISHED:hand_rect"
  input_stream_info: {
    tag_index: "FINISHED"
    back_edge: true
  }
  output_stream: "throttled_input_video"
}

Caches a hand-presence decision fed back from HandLandmarkSubgraph, and upon
the arrival of the next input image sends out the cached decision with the
timestamp replaced by that of the input image, essentially generating a packet
that carries the previous hand-presence decision. Note that upon the arrival
of the very first input image, an empty packet is sent out to jump start the
feedback loop.
node {
  calculator: "PreviousLoopbackCalculator"
  input_stream: "MAIN:throttled_input_video"
  input_stream: "LOOP:hand_presence"
  input_stream_info: {
    tag_index: "LOOP"
    back_edge: true
  }
  output_stream: "PREV_LOOP:prev_hand_presence"
}

Drops the incoming image if HandLandmarkSubgraph was able to identify hand
presence in the previous image. Otherwise, passes the incoming image through
to trigger a new round of hand detection in HandDetectionSubgraph.
node {
  calculator: "GateCalculator"
  input_stream: "throttled_input_video"
  input_stream: "DISALLOW:prev_hand_presence"
  output_stream: "hand_detection_input_video"

  node_options: {
    [type.googleapis.com/mediapipe.GateCalculatorOptions] {
      empty_packets_as_allow: true
    }
  }
}

Subgraph that detections hands (see hand_detection_gpu.pbtxt).
node {
  calculator: "HandDetectionSubgraph"
  input_stream: "hand_detection_input_video"
  output_stream: "DETECTIONS:palm_detections"
  output_stream: "NORM_RECT:hand_rect_from_palm_detections"
}

Subgraph that localizes hand landmarks (see hand_landmark_gpu.pbtxt).
node {
  calculator: "HandLandmarkSubgraph"
  input_stream: "IMAGE:throttled_input_video"
  input_stream: "NORM_RECT:hand_rect"
  output_stream: "LANDMARKS:hand_landmarks"
  output_stream: "NORM_RECT:hand_rect_from_landmarks"
  output_stream: "PRESENCE:hand_presence"
  output_stream: "HANDEDNESS:handedness"
}

Caches a hand rectangle fed back from HandLandmarkSubgraph, and upon the
arrival of the next input image sends out the cached rectangle with the
timestamp replaced by that of the input image, essentially generating a packet
that carries the previous hand rectangle. Note that upon the arrival of the
very first input image, an empty packet is sent out to jump start the
feedback loop.
node {
  calculator: "PreviousLoopbackCalculator"
  input_stream: "MAIN:throttled_input_video"
  input_stream: "LOOP:hand_rect_from_landmarks"
  input_stream_info: {
    tag_index: "LOOP"
    back_edge: true
  }
  output_stream: "PREV_LOOP:prev_hand_rect_from_landmarks"
}

Merges a stream of hand rectangles generated by HandDetectionSubgraph and that
generated by HandLandmarkSubgraph into a single output stream by selecting
between one of the two streams. The former is selected if the incoming packet
is not empty, i.e., hand detection is performed on the current image by
HandDetectionSubgraph (because HandLandmarkSubgraph could not identify hand
presence in the previous image). Otherwise, the latter is selected, which is
never empty because HandLandmarkSubgraphs processes all images (that went
through FlowLimiterCaculator).
node {
  calculator: "MergeCalculator"
  input_stream: "hand_rect_from_palm_detections"
  input_stream: "prev_hand_rect_from_landmarks"
  output_stream: "hand_rect"
}

Subgraph that renders annotations and overlays them on top of the input
images (see renderer_gpu.pbtxt).
node {
  calculator: "RendererSubgraph"
  input_stream: "IMAGE:throttled_input_video"
  input_stream: "LANDMARKS:hand_landmarks"
  input_stream: "NORM_RECT:hand_rect"
  input_stream: "DETECTIONS:palm_detections"
  input_stream: "HANDEDNESS:handedness"
  output_stream: "IMAGE:output_video"
}
I20200702 10:19:39.969641 22054 demo_run_graph_main_gpu.cc:57] Initialize the calculator graph.
I20200702 10:19:39.972904 22054 demo_run_graph_main_gpu.cc:61] Initialize the GPU.
I20200702 10:19:40.602629 22054 gl_context_egl.cc:158] Successfully initialized EGL. Major : 1 Minor: 4
I20200702 10:19:40.635076 22080 gl_context.cc:324] GL version: 3.0 (OpenGL ES 3.0 Mesa 18.0.5)
I20200702 10:19:40.635179 22054 demo_run_graph_main_gpu.cc:67] Initialize the camera or load the video.
[ WARN:0] VIDEOIO ERROR: V4L: can't open camera by index 0
**Error in `bazel-bin/mediapipe/examples/desktop/hand_tracking/hand_tracking_gpu': double free or corruption (fasttop): 0x00007fa53c0008f0**
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x777e5)[0x7fa56173c7e5]
/lib/x86_64-linux-gnu/libc.so.6(+0x8037a)[0x7fa56174537a]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x4c)[0x7fa56174953c]
/usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1(+0x13acc)[0x7fa561cb8acc]
/usr/lib/x86_64-linux-gnu/mesa-egl/libEGL.so.1(eglReleaseThread+0x66)[0x7fa561caef26]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x6439)[0x7fa5624fa439]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7870)[0x7fa5624fb870]
/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d)[0x7fa5617cc41d]
======= Memory map: ========
00400000-00b17000 r-xp 00000000 fd:00 4207147                            /home/V01.NET/uidq1459/.cache/bazel/_bazel_uidq1459/a8b1dc09f1f533f4a5338765afba65f7/execroot/mediapipe/bazel-out/k8-opt/bin/mediapipe/examples/desktop/hand_tracking/hand_tracking_gpu
00b18000-00b1a000 r--p 00717000 fd:00 4207147                            /home/V01.NET/uidq1459/.cache/bazel/_bazel_uidq1459/a8b1dc09f1f533f4a5338765afba65f7/execroot/mediapipe/bazel-out/k8-opt/bin/mediapipe/examples/desktop/hand_tracking/hand_tracking_gpu
00b1a000-00b1e000 rw-p 00719000 fd:00 4207147                            /home/V01.NET/uidq1459/.cache/bazel/_bazel_uidq1459/a8b1dc09f1f533f4a5338765afba65f7/execroot/mediapipe/bazel-out/k8-opt/bin/mediapipe/examples/desktop/hand_tracking/hand_tracking_gpu
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[mcclanahoochie]

Hi, based on your logs:

I20200702 10:19:40.635076 22080 gl_context.cc:324] GL version: 3.0 (OpenGL ES 3.0 Mesa 18.0.5)
I20200702 10:19:40.635179 22054 demo_run_graph_main_gpu.cc:67] Initialize the camera or load the video.
[ WARN:0] VIDEOIO ERROR: V4L: can't open camera by index 0

I see two issues

1. your GPU is not supported, because mediapipe requires OpenGL ES 3.1+
2. the code is attempting to open a webcam and can't

While # 2 can be fixed by supplying a path to a video file , the # 1 issue is a deal breaker.

You can try using the CPU version of the hand demo, and supply a video path (instead of defaulting to webcam) via --input_video_path=/path/to/file.mp4

[VeitchKyrie]

Hi mcclanahoochie，

thanks for ur reply, #2 has been fixed now with your help, but for #1, I still get some questions, hope you can help.
For #1,
Q1. Below is the output from glxinfo, and my ubuntu version is 16.04, is there a way to check the maximum supported OpenGL ES version? cause I'd like to upgrade it to OpenGL ES3.1 or better, can I do that?

OpenGL vendor string: VMware, Inc.m
OpenGL renderer string: SVGA3D; build: RELEASE; LLVM;
OpenGL core profile version string: 3.3 (Core Profile) Mesa 18.0.5
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 18.0.5
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 18.0.5
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
OpenGL ES profile extensions:

Q2. The card of My physical machine is Intel(R）HD Graphics 530, which should support OpenGL ES3.1+, but on my virtual machine it‘s SVGA3D，so could I configure the virtual one as same as my physical one with the purpose of making mediapipe run perfectly on my ubuntu.

thanks again, hope you can help here.

[mcclanahoochie]

Hi, unfortunately this looks like an issue with how the virtual machine handles the GPU. I would search around for VMware GPU support, or see if you can dual boot into linux.

[AlexYiningLiu]

Sorry this isn't an answer to your issue, but can you please let me know how you're running the desktop hand_tracking example? I have compiled the example using the command:

 $ bazel build --copt -DMESA_EGL_NO_X11_HEADERS --copt -DEGL_NO_X11 <my-target>

The compilation was successful, but I don't know how to actually run the compiled target file / where that file is. Can you please let me know how you ran the example? Thanks.

[mcclanahoochie]

@AlexYiningLiu look at the very first post, at the first line that starts with GLOG_logtostderr

[mcclanahoochie]

closing due to lack of activity