WriteGear Bare-Minimum example (Non-Compression) not working

[iflyingboots]

Description

1. I followed the demo here: https://github.com/abhiTronix/vidgear/wiki/Non-Compression-Mode:-OpenCV#1-writegear-bare-minimum-examplenon-compression-mode

2. Run the code

3. The following error showed:

Compression Mode is disabled, Activating OpenCV In-built Writer!
InputFrame => Height:360 Width:640 Channels:1
FILE_PATH: /******/Output.mp4, FOURCC = 1196444237, FPS = 30.0, WIDTH = 640, HEIGHT = 360, BACKEND =
OpenCV: FFMPEG: tag 0x47504a4d/'MJPG' is not supported with codec id 7 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'
Warning: RGBA and 16-bit grayscale video frames are not supported by OpenCV yet, switch to `compression_mode` to use them!
Traceback (most recent call last):
  File "cam_demo.py", line 31, in <module>
    writer.write(gray)
  File "/Users/*****/lib/python3.7/site-packages/vidgear/gears/writegear.py", line 221, in write
    raise ValueError('All frames in a video should have same size')
ValueError: All frames in a video should have same size

Acknowledgment

• A brief but descriptive Title of your issue
• I have searched the issues for my issue and found nothing related or helpful.
• I have read the FAQ.
• I have read the Wiki.
• I have read the Contributing Guidelines.

Environment

• VidGear version: 0.1.5
• Branch: PyPi
• Python version: 3.7.3
• pip version: 19.1.1
• Operating System and version: macOS 10.14.3

Expected Behavior

Write frame to file.

Actual Behavior

Frames in different sizes.

Possible Fix

WriteGear specify the output frame size?

Steps to reproduce

(Write your steps here:)

See description.

Optional

[abhiTronix]

I followed the demo here: https://github.com/abhiTronix/vidgear/wiki/Non-Compression-Mode:-OpenCV#1-writegear-bare-minimum-examplenon-compression-mode

Run the code

The following error showed:

Compression Mode is disabled, Activating OpenCV In-built Writer!
InputFrame => Height:360 Width:640 Channels:1
FILE_PATH: /*/Output.mp4, FOURCC = 1196444237, FPS = 30.0, WIDTH = 640, HEIGHT = 360, BACKEND =
OpenCV: FFMPEG: tag 0x47504a4d/'MJPG' is not supported with codec id 7 and format 'mp4 / MP4 (MPEG-4 Part 14)'
OpenCV: FFMPEG: fallback to use tag 0x7634706d/'mp4v'
Warning: RGBA and 16-bit grayscale video frames are not supported by OpenCV yet, switch to compression_mode to use them!
Traceback (most recent call last):
File "cam_demo.py", line 31, in
writer.write(gray)
File "/Users//lib/python3.7/site-packages/vidgear/gears/writegear.py", line 221, in write
raise ValueError('All frames in a video should have same size')
ValueError: All frames in a video should have same size

My Insight

ValueError: All frames in a video should have same size

@iflyingboots This error arises because for a different size (width/height) or a different number of channels(dimensions) of input frames which is either due to incorrect code you are using in your application or the input video stream have the incorrect number of channels.

• Also, The code you said https://github.com/abhiTronix/vidgear/wiki/Non-Compression-Mode:-OpenCV#1-writegear-bare-minimum-examplenon-compression-mode is working absolutely fine at my machine and all CLI test are passing too without any error whatsoever.

• Finally, macOS (OSX) is not officially supported by vidgear but may work. (Resolved in [Enhancement] Adding OSX environment support for Travis Cli tests #42, MacOS is now officially supported.)

Troubleshooting

@iflyingboots Kindly share the following files:

1. Kindly post the code of original "cam_demo.py" file that you are using.
2. Secondly, if you are using a video file as an input source then share the video URL here.

[abhiTronix]

Closed. Kindly provide necessary information/evidence related to issue for further troubleshooting.