cv2.VideoCaptureで設定可能なカメラパラメーターの一覧を取得して辞書型にする

WIDTH = 100
HEIGHT = 100
FPS = 10
cap = cv2.VideoCapture(0)
cap.set(cv2.CAP_PROP_FRAME_WIDTH, WIDTH)
cap.set(cv2.CAP_PROP_FRAME_HEIGHT, HEIGHT)
cap.set(cv2.CAP_PROP_FPS, FPS)
ret, frame = cap.read() #うまくいったりいかなかったり

import subprocess
import re
cmd = 'v4l2-ctl --device /dev/video0 --list-formats-ext'
proc = subprocess.Popen(cmd.split(), stdout=subprocess.PIPE)
outs_bytes = proc.communicate()[0]
outs_str = outs_bytes.decode('utf-8')
outs_str_lists = outs_str.split('\n')

d = {}
i = 0
for line in outs_str_lists:
    if "Pixel Format" in line:
        pixelformat = line.split(":")[-1].strip()
    if "Size:" in line:
        resolution = line.split()[-1]
    if "Interval" in line:
        fps = re.findall("(?<=\().+?(?=\))",line)[0].split()[0]
        _d = {"format":pixelformat,"height":resolution.split("x")[1],"width":resolution.split("x")[0],"fps":fps}
        d[i] = _d
        i +=1
print d

{0: {'format': "'MJPG' (compressed)",
  'height': '2880',
  'width': '3840',
  'fps': '15.000'},
 1: {'format': "'MJPG' (compressed)",
  'height': '2880',
  'width': '3840',
  'fps': '10.000'},
 2: {'format': "'MJPG' (compressed)",
  'height': '2880',
  'width': '3840',
  'fps': '5.000'},