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#!/usr/bin/env python3
import argparse
parser = argparse.ArgumentParser(description='Crop and scale a video based on bounding boxes', formatter_class=argparse.ArgumentDefaultsHelpFormatter)
parser.add_argument('boxes', help='Path to csv file where bounding boxes are saved')
parser.add_argument('video', help='Path to video to crop')
parser.add_argument('--intermediary', help='Path to intermediary video if size differs')
parser.add_argument('--no-interpolate', help='Do not interpolate over gaps between box updates', action='store_true')
parser.add_argument('--label', help='Boxes label (uses all if not provided)')
parser.add_argument('--save-stem', help='Location to save stem.npz and stem.avi', default='out')
parser.add_argument('--skip-zero-boxes', help='Skip boxes with zero size', action='store_true')
parser.add_argument('--outputWH', help='Output width and height', nargs=2, default=[64,64], type=int)
parser.add_argument('--debug', help='Save a debugging video as well', action='store_true')
args = parser.parse_args()
OUTW, OUTH = args.outputWH
import csv
with open(args.boxes) as f:
boxes = list(csv.reader(f))
if args.label:
boxes = [b for b in boxes if b[0] == args.label]
import cv2
cap = cv2.VideoCapture(args.video)
width = cap.get(cv2.CAP_PROP_FRAME_WIDTH)
height = cap.get(cv2.CAP_PROP_FRAME_HEIGHT)
fps = cap.get(cv2.CAP_PROP_FPS)
zoomX = 1.0
zoomY = 1.0
if args.intermediary:
inter = cv2.VideoCapture(args.intermediary)
interWidth = inter.get(cv2.CAP_PROP_FRAME_WIDTH)
interHeight = inter.get(cv2.CAP_PROP_FRAME_HEIGHT)
zoomX = width / interWidth
zoomY = height / interHeight
inter.release()
# Each box is [str(label), float(time), int(x1), int(y1), int(x2), int(y2)]
boxes = [[b[0], float(b[1]), int(int(b[2]) * zoomX), int(int(b[3]) * zoomY), int(int(b[4]) * zoomX), int(int(b[5]) * zoomY)] for b in boxes]
if args.skip_zero_boxes:
boxes = [b for b in boxes if b[2] != b[4] and b[3] != b[5]]
def alignDims(box: list, whRatio: float = 1.0) -> list:
'''Make a bounding box dimentions adhere to given ratio
Arguments:
box: The bounding box, formatted [x1, y1, x2, y2]
whRatio: The desired ratio of width to height
Returns:
list: The adjusted box
'''
coords1, coords2 = [0, 2], [1, 3]
if (box[coords2[1]] - box[coords2[0]]) * whRatio > (box[coords1[1]] - box[coords1[0]]):
coords1, coords2 = coords2, coords1
whRatio = 1 / whRatio
# coords1 > whRatio * coords2, but we want them equal
d = int((box[coords1[1]] - box[coords1[0]]) / whRatio - (box[coords2[1]] - box[coords2[0]]))
box[coords2[0]] -= int(d/2)
box[coords2[1]] += int(d/2) + (d % 2)
return box
def shift(box: list, w: int, h: int) -> list:
'''Shift a bounding box to be within w,h bounds
Arguments:
box: The bounding box, formatted [x1, y1, x2, y2]
w: The width of the frame (i.e., maximum x value)
h: The height of the frame (i.e., maximum y value)
Returns:
list: The shifted box
'''
bounds = [[0, int(w)], [0, int(h)]]
coords = [[0, 2], [1, 3]]
for b, c in zip(bounds, coords):
s = 0
if box[c[0]] < b[0]:
s = -box[c[0]]
elif box[c[1]] > b[1]:
s = b[1] - box[c[1]]
box[c[0]] += s
box[c[1]] += s
return box
boxes = [box[0:2] + shift(alignDims(box[2:], OUTW/OUTH), width, height) for box in boxes]
import numpy as np
outArry = []
outVid = cv2.VideoWriter(args.save_stem + '.avi', cv2.VideoWriter_fourcc('M','J','P','G'), fps, (OUTW, OUTH))
if args.debug:
outDebug = cv2.VideoWriter(args.save_stem + '-debug.avi', cv2.VideoWriter_fourcc('M','J','P','G'), fps, (int(OUTW * height / OUTH + width), int(height)))
# This may take a bit, so do a progress bar
from progress.bar import IncrementalBar
bar = IncrementalBar('Frames Processed', max=cap.get(cv2.CAP_PROP_FRAME_COUNT), suffix='%(index)d/%(max)d - %(eta)d s')
frameNum = 0
while cap.isOpened():
ret, frame = cap.read()
if not ret:
break
time = frameNum / fps
# Make boxes[0] the most recent timestamp without going over current time
while len(boxes) >= 2 and boxes[1][1] <= time:
boxes = boxes[1:]
if len(boxes) == 1: # Stop when we run out
break
box = boxes[0]
if not args.no_interpolate:
weight = (boxes[1][1] - time) / (boxes[1][1] - boxes[0][1])
box = [boxes[0][0], time] + [int(boxes[0][i] * weight + boxes[1][i] * (1-weight)) for i in range(2, 6)]
x1, x2 = sorted([box[2], box[4]])
y1, y2 = sorted([box[3], box[5]])
cropped = frame[y1:y2, x1:x2]
if cropped.size < 1:
resized = np.zeros((OUTH, OUTW, 3), dtype=cropped.dtype)
else:
resized = cv2.resize(cropped, (OUTH, OUTW), interpolation=cv2.INTER_CUBIC)
outArry.append(resized)
outVid.write(resized)
if args.debug:
# Draw box on frame
cv2.rectangle(frame, (x1, y1), (x2, y2), (0, 255, 0), 2)
# Resize "resized"
scaledUp = cv2.resize(resized, (int(OUTW * height / OUTH), int(height)), interpolation=cv2.INTER_AREA)
concatted = cv2.hconcat([frame, scaledUp])
outDebug.write(concatted)
bar.next()
frameNum += 1
bar.finish()
print(f'Ending at time = {time}')
# Save out array
np.savez_compressed(args.save_stem + '.npz', np.array(outArry))
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