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picamera overlay bug (mmal) #174

spinomaly opened this issue Oct 19, 2014 · 1 comment

picamera overlay bug (mmal) #174

spinomaly opened this issue Oct 19, 2014 · 1 comment


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I have a B+ with the latest Noobs Raspian off the website (release date 2014-09-09). I am having troubles adding and removing overlays. After a sequence of approximately 60 add/remove overlays an out of memory error occurs. Code below as well as error. I watched the system memory during the add and remove overlay and the memory decreases at a specific rate that appears to be related to either the preview or bumpy buffer size. However, If I specify a smaller preview size than below the memory error still occurs with remaining system memory (but that still was decreasing).

import time
import picamera
import numpy as np

a = np.zeros((720, 1280, 3), dtype=np.uint8)
a[360, :, :] = 0xff
a[:, 640, :] = 0xff

i = 0

with picamera.PiCamera() as camera:
    camera.resolution = (1280, 720)
    camera.framerate = 24

    while True:

        i += 1
        o = camera.add_overlay(np.getbuffer(a), layer=3, alpha=64)
mmal: mmal_vc_component_create: failed to create component '' (1:ENOMEM)
mmal: mmal_component_create_core: could not create component '' (1)
Traceback (most recent call last):
File "", line 26, in <module>
o = camera.add_overlay(np.getbuffer(a), layer=3, alpha=64)
File "/usr/lib/python2.7/dist-packages/picamera/", line 953, in add_overlay
renderer = PiOverlayRenderer(self, source, size, **options)
File "/usr/lib/python2.7/dist-packages/picamera/", line 474, in __init__
rotation, vflip, hflip)
File "/usr/lib/python2.7/dist-packages/picamera/", line 89, in __init__
prefix="Failed to create renderer component")
File "/usr/lib/python2.7/dist-packages/picamera/", line 133, in mmal_check
raise PiCameraMMALError(status, prefix)
picamera.exc.PiCameraMMALError: Failed to create renderer component: Out of memory
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Excellent - thanks for the bug report - I'll mark this for 1.9

@waveform80 waveform80 added the bug label Oct 19, 2014
@waveform80 waveform80 added this to the 1.9 milestone Oct 19, 2014
@waveform80 waveform80 self-assigned this Oct 19, 2014
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