Error starting example hello world file (Initial Setup)

[yfedberts]

I've installed MediaPipe on Ubuntu 20.04 based on the instructions given by the MediaPipe team, though when I try to run the example I keep receiving the following error:

Error

ERROR: Analysis of target '//mediapipe/examples/desktop/hello_world:hello_world' failed; build aborted: Traceback (most recent call last):
 File "/root/.cache/bazel/_bazel_root/6be9f6de2f9f4c6f3d41746e8583a46a/external/org_tensorflow/third_party/py/python_configure.bzl", line 208
  get_python_bin(repository_ctx)
 File "/root/.cache/bazel/_bazel_root/6be9f6de2f9f4c6f3d41746e8583a46a/external/org_tensorflow/third_party/remote_config/common.bzl", line 44, in get_python_bin
  which(repository_ctx, "python")
 File "/root/.cache/bazel/_bazel_root/6be9f6de2f9f4c6f3d41746e8583a46a/external/org_tensorflow/third_party/remote_config/common.bzl", line 29, in which
  execute(repository_ctx, <1 more arguments>)
 File "/root/.cache/bazel/_bazel_root/6be9f6de2f9f4c6f3d41746e8583a46a/external/org_tensorflow/third_party/remote_config/common.bzl", line 208, in execute
  fail(<1 more arguments>)
Repository command failed

I have tried reinstalling python and the entire ubuntu system but still no luck...

I'm running Ubuntu 20.04 on a VM using VirtualBox if that helps(?)

[jiuqiant]

Seems like Bazel doesn't find the python binary. You can add --action_env PYTHON_BIN_PATH=<path> to specify where it is.

For example, we have a similar issue on native Windows and we solved it by running

C:\Users\Username\mediapipe_repo>bazel build -c opt --define MEDIAPIPE_DISABLE_GPU=1 --action_env PYTHON_BIN_PATH="C:/python_36/python.exe" mediapipe/examples/desktop/hello_world

See more details at https://google.github.io/mediapipe/getting_started/install#installing-on-windows

[yfedberts]

Thanks for the swift response @jiuqiant , that seems to have solved one problem and now I've come across two other problem with the following error:

bazel run -c opt --define MEDIAPIPE_DISABLE_GPU=1 --action_env PYTHON_BIN_PATH="/usr/bin/python3.8" mediapipe/examples/desktop/hello_world:hello_world
DEBUG: Rule 'rules_cc' indicated that a canonical reproducible form can be obtained by modifying arguments sha256 = "a07fc8b90c22e42962142504438a84b31567976adcd9ee1a4c9f75d2e3396f8d"
DEBUG: Repository rules_cc instantiated at:
  no stack (--record_rule_instantiation_callstack not enabled)
Repository rule http_archive defined at:
  /home/edbert/.cache/bazel/_bazel_edbert/6be9f6de2f9f4c6f3d41746e8583a46a/external/bazel_tools/tools/build_defs/repo/http.bzl:336:31: in <toplevel>
INFO: Analyzed target //mediapipe/examples/desktop/hello_world:hello_world (0 packages loaded, 0 targets configured).
INFO: Found 1 target...
Target //mediapipe/examples/desktop/hello_world:hello_world up-to-date:
  bazel-bin/mediapipe/examples/desktop/hello_world/hello_world
INFO: Elapsed time: 0.413s, Critical Path: 0.01s
INFO: 0 processes.
INFO: Build completed successfully, 1 total action
INFO: Build completed successfully, 1 total action
Segmentation fault (core dumped)

I've also received the following error on top of the previous one:

INFO: From ProtoCompile mediapipe/calculators/internal/callback_packet_calculator.pb.h:
bazel-out/k8-opt/bin/external/com_google_protobuf/src: warning: directory does not exist.
INFO: From ProtoCompile mediapipe/framework/calculator.pb.h:
bazel-out/k8-opt/bin/external/com_google_protobuf/src: warning: directory does not exist.
INFO: From ProtoCompile mediapipe/framework/calculator_profile.pb.h:
bazel-out/k8-opt/bin/external/com_google_protobuf/src: warning: directory does not exist.
INFO: From ProtoCompile mediapipe/framework/tool/calculator_graph_template.pb.h:
bazel-out/k8-opt/bin/external/com_google_protobuf/src: warning: directory does not exist.

[jiuqiant]

Seems like MP is not 100% ready for supporting Ubuntu 20.04 LTS.
See the workaround at #816 (comment).

[jiuqiant]

The fix is released in e9fbe86.