acapture

https://github.com/aieater/python_acapture

acapture (async capture python library)

Description

acapture is a python camera/video capturing library for realtime. When python apps implement video, web camera and screenshot capturing, it is too slow FPS and suffering with that performance. In addition, python is non event driven architecture and always be I/O blocking problem, and that will be imped parallelism.

acapture(AsynchronusCapture) library provides async video/camera capturing implementation and can solve that blocking and performance problems.

acapture library is useful instead of OpenCV VideoCapture API.

OpenCV has blocking problem.

import cv2
cap = cv2.VideoCapture(0)
check,frame = cap.read() # blocking!! and depends on camera FPS.

acapture library can solve that blocking problem in realtime apps.

import acapture
cap = acapture.open(0)
check,frame = cap.read() # non-blocking

Also see 'pyglview' package.

OpenCV3 renderer is too slow due to cv2.waitKey(1). If you want to more performance, you should use OpenCV4+ or 'pyglview' package.

https://github.com/aieater/python_glview.git

This package is supported fastest OpenGL direct viewer and OpenCV renderer both. If your environment was not supported OpenGL, it will be switched to CPU renderer(OpenCV) automatically and also available remote desktop(Xserver) like VNC.

Getting Started

Base libraries on Ubuntu16.04

Library	installation
Camera	sudo apt install -y libv4l-dev libdc1394-22 libdc1394-22-dev v4l-utils
Video	sudo apt install -y ffmpeg libavcodec-dev libavformat-dev libswscale-dev libxine2-dev libfaac-dev libmp3lame-dev mplayer

Base libraries on MacOSX

Library	installation
Brew	/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Camera	-
Video	brew install ffmpeg mplayer

Python package dependencies

Version	Library	installation
v3.x/v4.x	OpenCV	pip3 install opencv-python
v4.x	mss	pip3 install mss
v1.1x.x	numpy	pip3 install numpy
v1.9.x	pygame	pip3 install pygame
v3.7.x	configparser	pip3 install configparser

Finally, install acapture.

pip3 install acapture

---

Examples

Video stream (Async)

import acapture
import cv2

cap = acapture.open("test.mp4")
while True:
    check,frame = cap.read() # non-blocking
    if check:
        frame = cv2.cvtColor(frame,cv2.COLOR_BGR2RGB)
        cv2.imshow("test",frame)
        cv2.waitKey(1)

Video frames (Async)

cap = acapture.open("test.mp4",frame_capture=True)

Camera stream (Async)

import acapture
import cv2

cap = acapture.open(0) # /dev/video0
while True:
    check,frame = cap.read() # non-blocking
    if check:
        frame = cv2.cvtColor(frame,cv2.COLOR_BGR2RGB)
        cv2.imshow("test",frame)
        cv2.waitKey(1)

Screenshot stream (Sync)

import acapture
import cv2

cap = acapture.open(-1)
while True:
    check,frame = cap.read() # blocking
    if check:
        frame = cv2.cvtColor(frame,cv2.COLOR_BGR2RGB)
        cv2.imshow("test",frame)
        cv2.waitKey(1)

Directory images (Sync)

import acapture
import cv2

cap = acapture.open("images/")
while True:
    check,frame = cap.read() # blocking
    if check:
        frame = cv2.cvtColor(frame,cv2.COLOR_BGR2RGB)
        cv2.imshow("test",frame)
        cv2.waitKey(1)

Unit image (Preloaded)

import acapture
import cv2

cap = acapture.open("images/test.jpg")
while True:
    check,frame = cap.read()
    if check:
        frame = cv2.cvtColor(frame,cv2.COLOR_BGR2RGB)
        cv2.imshow("test",frame)
        cv2.waitKey(1)

Extract video to jpg images.

import acapture

acapture.extract_video2images("test.mp4",format="jpg",quality=2)

---

APIs

Version	Function	Required	Description
v1.0	open(f,**kargs)	f	Open stream. [-1=>screenshot], [0=>camera0], [1=>camera1], [dirpath=>images], [path=>image],[path=>video]
v1.0	extract_video2images(path,**kargs)	path	Extract video to images.
v1.0	camera_info()		Display camera information on Ubuntu.
v1.0	compress_images2video(path,**kargs)	path	Make video from images.
v1.0	extract_video2audio(f)	path	Extract audio file as mp3.
v1.0	join_audio_with_video(vf,af)	vf, af	Join video file and audio file.

Also see 'pyglview' package.

OpenCV3 renderer is too slow. If you want to more performance, you should use OpenCV4 or pyglview package.

https://github.com/aieater/python_glview.git

This package is supported fastest OpenGL viewer and OpenCV renderer both. If your environment was not supported OpenGL, it will be switched to CPU renderer(OpenCV) automatically and also available remote desktop(Xserver) like VNC.

acapture + pyglview + webcamera example.

import cv2
import acapture
import pyglview
viewer = pyglview.Viewer()
cap = acapture.open(0) # Camera 0,  /dev/video0
def loop():
    check,frame = cap.read() # non-blocking
    frame = cv2.cvtColor(frame,cv2.COLOR_BGR2RGB)
    if check:
        viewer.set_image(frame)
viewer.set_loop(loop)
viewer.start()

Logicool C922 1280x720(HD) is supported 60FPS. This camera device and OpenGL direct renderer is best practice. Logicool BRIO 90FPS camera is also good!, but little bit expensive.

License

This project is licensed under the MIT License - see the LICENSE file for details