# voxl streamer failing to create tflite pipe with latest version of code from master

Source: https://forum.modalai.com/topic/442/voxl-streamer-failing-to-create-tflite-pipe-with-latest-version-of-code-from-master
Category: Flight Core and Legacy VOXL (https://forum.modalai.com/category/9/flight-core-and-legacy-voxl)
Tags: voxl
Posted: 2021-09-13 20:18:31 UTC by colerose
Replies: 9 · Views: 2598

## colerose · 2021-09-13 20:18:31 UTC

I pulled the latest version of the stable code from the voxl-tflite-server master branch on github and built it directly in voxl-cross. It appeared to build just fine. However, when trying to run voxl-streamer with the tflite overlay it appears that the tflite pipe is not being created.

When running 
```
voxl-streamer -c tflite-overlay
```
the output simply hangs and doesn't display the usual message of:

```
Stream available at rtsp://127.0.0.1:8900/live
```

Any input on why this might be happening? Here is the output of building the ipk file:

```
voxl-cross:~/voxl-tflite-server$ ./clean.sh 
voxl-cross:~/voxl-tflite-server$ ./install_build_deps.sh stable
using stable repository
Downloading http://voxl-packages.modalai.com/stable/Packages.gz.
Updated source 'stable'.
Installing libmodal_pipe (2.0.10) on root.
Downloading http://voxl-packages.modalai.com/stable/libmodal_pipe_2.0.10.ipk.
Configuring libmodal_pipe.

Done installing libmodal_pipe

Installing libmodal_json (0.3.5) on root.
Downloading http://voxl-packages.modalai.com/stable/libmodal_json_0.3.5.ipk.
Configuring libmodal_json.

Done installing libmodal_json

Installing opencv (4.5.2) on root.
Downloading http://voxl-packages.modalai.com/stable/opencv_4.5.2-2.ipk.
Configuring opencv.

done installing opencv

Installing voxl-tflite (0.0.1) on root.
Downloading http://voxl-packages.modalai.com/stable/voxl-tflite_0.0.1.ipk.
Configuring voxl-tflite.
voxl-cross:~/voxl-tflite-server$ ./build.sh 
+ set -e
+ mkdir -p build
+ cd build
+ cmake -DCMAKE_TOOLCHAIN_FILE=/opt/cross_toolchain/aarch64-gnu-4.9.toolchain.cmake -DCMAKE_BUILD_TYPE=RELEASE -DENABLE_NEON=ON '-DCMAKE_CXX_FLAGS= -std=c++11 -march=armv8-a' ../server
-- The C compiler identification is GNU 4.9.3
-- The CXX compiler identification is GNU 4.9.3
-- Check for working C compiler: /usr/bin/aarch64-linux-gnu-gcc-4.9
-- Check for working C compiler: /usr/bin/aarch64-linux-gnu-gcc-4.9 -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/aarch64-linux-gnu-g++-4.9
-- Check for working CXX compiler: /usr/bin/aarch64-linux-gnu-g++-4.9 -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Configuring done
-- Generating done
CMake Warning:
  Manually-specified variables were not used by the project:

    ENABLE_NEON

-- Build files have been written to: /home/root/voxl-tflite-server/build
+ make -j 4 TARGET=aarch64 TARGET_TOOLCHAIN_PREFIX=aarch64-linux-gnu-
Scanning dependencies of target voxl-tflite-server
[ 40%] Building CXX object CMakeFiles/voxl-tflite-server.dir/main.cpp.o
[ 40%] Building C object CMakeFiles/voxl-tflite-server.dir/undistort.c.o
[ 60%] Building CXX object CMakeFiles/voxl-tflite-server.dir/models.cpp.o
[ 80%] Building CXX object CMakeFiles/voxl-tflite-server.dir/threads.cpp.o
In file included from /usr/include/modal_pipe_client.h:42:0,
                 from /usr/include/modal_pipe.h:41,
                 from /home/root/voxl-tflite-server/server/threads.h:40,
                 from /home/root/voxl-tflite-server/server/models.cpp:46:
/usr/include/modal_pipe_common.h:63:2: warning: #warning Building for Android [-Wcpp]
 #warning Building for Android
  ^
[100%] Linking CXX executable voxl-tflite-server
[100%] Built target voxl-tflite-server
voxl-cross:~/voxl-tflite-server$ ./make_package.sh 

Package Name:  voxl-tflite-server
version Number:  0.1.1
[100%] Built target voxl-tflite-server
Install the project...
-- Install configuration: "RELEASE"
-- Installing: ../ipk/data/usr/bin/voxl-tflite-server
/home/root/voxl-tflite-server
ar: creating voxl-tflite-server_0.1.1.ipk

DONE

```

## Reply by colerose · 2021-09-14 00:48:47 UTC

This was all working up until the time libmodal_pipe was updated which seems to be sept 2. How would I use an older version of libmodal_pipe?

## Reply by colerose · 2021-09-14 00:50:59 UTC

Also, here are the available mpa pipes after installing the server.

![be12412d-d581-49fc-beda-b1566111f19e-image.png](https://forum.modalai.com/assets/uploads/files/1631580592138-be12412d-d581-49fc-beda-b1566111f19e-image.png)

## Reply by Guest · 2021-09-14 15:36:45 UTC

Hi @colerose,
Are you running the voxl-tflite-server before you try to view the output with voxl-streamer? The pipe is missing from your run/mpa screenshot, so it doesn't look like the server has been started. It can be started manually or setup as a service using voxl-configure-tflite on target.

## Reply by colerose · 2021-09-14 16:37:44 UTC

@Matt-Turi yes, I have tried both running it as a service and setting the server up manually. The tflite server will work on its own which is clear based on the output that it prints in debug mode. However, it simply does not stream in voxl-streamer with the tflite-overlay even though the server voxl-tflite-server is running fine when I try to use the streamer.

## Reply by colerose · 2021-09-14 17:11:21 UTC

To be more concrete, my team and I have tried to build the dev version from master, the stable version from master, as well as many other previous versions that we were able to get working before Sept 2 (on multiple drones). The builds all prior worked fine with all of these versions (on multiple drones). After then, we haven't been able to get a single version that will create the tflite pipe to allow voxl-streamer to use the tflite overlay (on any drone). However, all of them show that the tflite server is working fine in debug mode on its own.

## Reply by Guest · 2021-09-14 19:24:28 UTC

Looks like this was a bug with some of the tensorflow headers affecting new changes in libmodal pipe. Thanks for pointing this out, v0.1.3 will fix this issue and will be live shortly.

## Reply by colerose · 2021-09-14 19:30:34 UTC

Thanks @Matt-Turi! Can you please reply to this thread to let me know when it’s up?

## Reply by Guest · 2021-09-14 19:46:43 UTC

It's up for both dev/stable branches

## Reply by colerose · 2021-09-14 20:44:56 UTC (in reply to Guest)

@Matt-Turi Great thanks! I'll give it a shot now!