get_depth_frame() problem

[m10507323]

Hi, I build librealsense in arm base system and try to run demo python program, here is my program, and my camera model is D435.

import pyrealsense2 as rs
import numpy as np
import cv2

pipeline = rs.pipeline()

config = rs.config()
config.enable_stream(rs.stream.depth, 640, 480, rs.format.z16, 30)

profile = pipeline.start(config)
try:
    while True:
        frames = pipeline.wait_for_frames()
        depth = frames.get_depth_frame()
        colorizer = rs.colorizer()
        colorized_depth = np.asanyarray(colorizer.colorize(depth).get_data())
        colorized_depth_rgb = cv2.cvtColor(colorized_depth, cv2.COLOR_BGR2RGB)
        cv2.imshow('depth_colormap_rgb', colorized_depth_rgb)
        cv2.waitKey(1)

finally:
    pipeline.stop()

But I got error message like this:

Traceback (most recent call last):
  File "realsense_back.py", line 14, in <module>
    depth = frames.get_depth_frame()
TypeError: get_depth_frame(): incompatible function arguments. The following argument types are supported:
    1. (self: pyrealsense2.composite_frame, arg0: int) -> pyrealsense2.depth_frame
Invoked with: <pyrealsense2.frameset Z16 BGR8 #1>

Is anyone know how to solve it? Any suggestion with be appreciated.

[MartyG-RealSense]

Could you try inserting this line directly below depth = frames.get_depth_frame() please:

if not depth: continue

So that it looks like this:

try: while True: frames = pipeline.wait_for_frames() depth = frames.get_depth_frame() if not depth: continue colorizer = rs.colorizer()

[ev-mp]

@m10507323 , it seem that you're building from source from development and not the master branch.

If that's the case you'd need to pass in the stream index 0 so it would look

depth = frames.get_depth_frame(0)

Note that development is used for experiments and in this case the change will be reverted.

[m10507323]

@MartyG-RealSense , @ev-mp Hi, sorry for my late reply, https://github.com/IntelRealSense/librealsense/blob/master/doc/installation.md I follow this toturial to build librealsense, and I've already try both of your suggestion, here is my update code.

pipeline = rs.pipeline()
config = rs.config()
config.enable_stream(rs.stream.depth, 640, 480, rs.format.z16, 30)
profile = pipeline.start(config)
try:
    while True:
        frames = pipeline.wait_for_frames()
        depth = frames.get_depth_frame(0)
        if not depth: 
            continue
        colorizer = rs.colorizer()
        colorized_depth = np.asanyarray(colorizer.colorize(depth).get_data())
        colorized_depth_rgb = cv2.cvtColor(colorized_depth, cv2.COLOR_BGR2RGB)
        cv2.imshow('depth_colormap_rgb', colorized_depth_rgb)
        cv2.waitKey(1)
finally:
    pipeline.stop()

But I got new error:

No protocol specified
(depth_colormap_rgb:17537): Gtk-WARNING **: cannot open display: :0.0

In this case, should I change other setting or install any package? Thanks.

[m10507323]

I find out that the problem isn't come from realsense but from Xserver. I'll try other way to solve it, thanks for your help.

[MartyG-RealSense]

Thanks very much for the update @m10507323 - good luck!