[Bug]: value error when using screengear with netgear

[amarco]

Description

New to vidgear, I started by using the following code based on the example:

# import required libraries
from vidgear.gears import ScreenGear
from vidgear.gears import NetGear

# open video stream with defined parameters with monitor at index `1` selected
stream = ScreenGear(monitor=1, logging=True).start()

options = {"flag": 0, "copy": False, "track": False}
server = NetGear(
    address="10.212.110.3",
    port="5454",
    protocol="tcp",
    pattern=1,
    logging=True,
    **options
)

# loop over
while True:

    try:
        # read frames from stream
        frame = stream.read()
    
        # check for frame if Nonetype
        if frame is None:
            break

        server.send(frame)
    except KeyboardInterrupt:
        break
    

# safely close video stream
stream.stop()
server.close()

get the following error and abort of execution. Is there a workaround?

c:\Users\ma\OneDrive - RWDI\Desktop\devel\dstream>python producerv2.py
13:12:08 ::    Helper     ::   INFO   :: Running VidGear Version: 0.2.6
13:12:08 ::  ScreenGear   ::  DEBUG   :: Enabling Threaded Queue Mode by default for ScreenGear!
13:12:08 ::    NetGear    ::  DEBUG   :: Reliable transmission is enabled for this pattern with max-retries: 3 and timeout: 4.0 secs.
13:12:08 ::    NetGear    ::  DEBUG   :: Successfully connected to address: tcp://10.212.110.3:5454 with pattern: 1.
13:12:08 ::    NetGear    ::  DEBUG   :: JPEG Frame-Compression is activated for this connection with Colorspace:`BGR`, Quality:`90`%, Fastdct:`enabled`, and Fastupsample:`disabled`.
13:12:08 ::    NetGear    ::  DEBUG   :: Unique System ID is Q7A4RFHL.
13:12:08 ::    NetGear    ::  DEBUG   :: Send Mode is successfully activated and ready to send data.
Traceback (most recent call last):
  File "c:\Users\ma\OneDrive - RWDI\Desktop\devel\dstream\producerv2.py", line 42, in <module>
    server.send(frame)
  File "C:\WinPython\WPy64-39100\python-3.9.10.amd64\lib\site-packages\vidgear\gears\netgear.py", line 1260, in send
    frame = simplejpeg.encode_jpeg(
  File "simplejpeg/_jpeg.pyx", line 440, in simplejpeg._jpeg.encode_jpeg
ValueError: 4 channels does not match given colorspace BGR

Issue Checklist

• I have searched open or closed issues for my problem and found nothing related or helpful.
• I have read the Documentation and found nothing related to my problem.
• I've read the Issue Guidelines and wholeheartedly agree.

Expected behaviour

not expecting a crash

Actual behaviour

should not crash

Steps to reproduce

use sample code in windows 10

Terminal log output

No response

Python Code

No response

VidGear Version

0.2.4

Python version

3.9.10

OpenCV version

4.6.0

Operating System version

windows 10

Any other Relevant Information?

No response

[welcome]

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[abhiTronix]

Traceback (most recent call last):
File "c:\Users\ma\OneDrive - RWDI\Desktop\devel\dstream\producerv2.py", line 42, in
server.send(frame)
File "C:\WinPython\WPy64-39100\python-3.9.10.amd64\lib\site-packages\vidgear\gears\netgear.py", line 1260, in send
frame = simplejpeg.encode_jpeg(
File "simplejpeg/_jpeg.pyx", line 440, in simplejpeg._jpeg.encode_jpeg
ValueError: 4 channels does not match given colorspace BGR

@amarco This is not a bug.

You're using monitor=1 in ScreenGear API, which will output BGRA colorspace frames instead of default BGR(See https://abhitronix.github.io/vidgear/latest/gears/screengear/usage/#using-screengear-with-multiple-screens).

But NetGear API on other hand expects BGR frames by default:

vidgear/vidgear/gears/netgear.py

Line 215 in 6e4eaf6

self.__jpeg_compression_colorspace = "BGR" # use BGR colorspace by default

and is incompatible with BGRA frames from ScreenGear API.

 

Solution:

There are two solutions to this problem and you can use any one of them to resolve this issue.

Solution-1: Change colorspace to BGRA in NetGear API

# import required libraries
from vidgear.gears import ScreenGear
from vidgear.gears import NetGear

# open video stream with defined parameters with monitor at index `1` selected
stream = ScreenGear(monitor=1, logging=True).start()

# change colorspace to `BGRA`
options = {"flag": 0, "copy": False, "track": False, "jpeg_compression":"BGRA"}
server = NetGear(
    address="10.212.110.3",
    port="5454",
    protocol="tcp",
    pattern=1,
    logging=True,
    **options
)

# loop over
while True:

    try:
        # read frames from stream
        frame = stream.read()
    
        # check for frame if Nonetype
        if frame is None:
            break

        server.send(frame)
    except KeyboardInterrupt:
        break
    

# safely close video stream
stream.stop()
server.close()

Solution-2: Remove monitor=1 in ScreenGear API

# import required libraries
from vidgear.gears import ScreenGear
from vidgear.gears import NetGear

# open video stream with defined parameters
stream = ScreenGear(logging=True).start()

options = {"flag": 0, "copy": False, "track": False}
server = NetGear(
    address="10.212.110.3",
    port="5454",
    protocol="tcp",
    pattern=1,
    logging=True,
    **options
)

# loop over
while True:

    try:
        # read frames from stream
        frame = stream.read()
    
        # check for frame if Nonetype
        if frame is None:
            break

        server.send(frame)
    except KeyboardInterrupt:
        break
    

# safely close video stream
stream.stop()
server.close()