Python3视频转字符动画的实例代码
Python3视频转字符动画，具体代码如下所示：
# -*- coding:utf-8 -*-
import json
import os
import subprocess
from pathlib import Path
from cv2 import cv2
import numpy as np
from time import time
import webbrowser
play_chars_js = '''
let i = 0;
window.setInterval(function(){
let img = frames[i++];
let html = ""
for(let line of img){
for(let char of line){
let [[r,g,b], ch] = char;
html += '<span style="color:rgb(' + r + ', ' + g + ', '+ b + ');">'+ ch + '</span>'
// html += '<span style="background-color:rgb(' + r + ', ' + g + ', '+ b + ');">'+ ch + '</span>'
}
html += "<br>"
}
document.getElementsByClassName("video-panel")[0].innerHTML = html
}, 1000/fps);
document.getElementsByTagName("audio")[0].play();
'''
class VideoToHtml:
# 像素形状，因为颜色已经用rgb控制了，这里的pixels其实可以随意排
pixels = "$#@&%ZYXWVUTSRQPONMLKJIHGFEDCBA098765432?][}{/)(><zyxwvutsrqponmlkjihgfedcba*+1-."
def __init__(self, video_path, fps_for_html=8, time_interval=None):
"""
:param video_path: 字符串, 视频文件的路径
:param fps_for_html: 生成的html的帧率
:param time_interval: 用于截取视频（开始时间，结束时间）单位秒
"""
self.video_path = Path(video_path)
# 从指定文件创建一个VideoCapture对象
self.cap = cv2.VideoCapture(video_path)
self.width = self.cap.get(cv2.CAP_PROP_FRAME_WIDTH)
self.height = self.cap.get(cv2.CAP_PROP_FRAME_HEIGHT)
self.frames_count_all = self.cap.get(cv2.CAP_PROP_FRAME_COUNT)
self.fps = self.cap.get(cv2.CAP_PROP_FPS)
self.resize_width = None
self.resize_height = None
self.frames_count = 0
self.fps_for_html = fps_for_html
self.time_interval = time_interval
def video2mp3(self):
"""#调用ffmpeg获取mp3音频文件"""
mp3_path = self.video_path.with_suffix('.mp3')
subprocess.call('ffmpeg -i ' + str(self.video_path) + ' -f mp3 ' + str(mp3_path), shell=True)
return mp3_path
def set_width(self, width):
"""只能缩小，而且始终保持长宽比"""
if width >= self.width:
return False
else:
self.resize_width = width
self.resize_height = int(self.height * (width / self.width))
return True
def set_height(self, height):
"""只能缩小，而且始终保持长宽比"""
if height >= self.height:
return False
else:
self.resize_height = height
self.resize_width = int(self.width * (height / self.height))
return True
def resize(self, img):
"""
将img转换成需要的大小
原则：只缩小，不放大。
"""
# 没指定就不需resize了
if not self.resize_width or not self.resize_height:
return img
else:
size = (self.resize_width, self.resize_height)
return cv2.resize(img, size, interpolation=cv2.INTER_CUBIC)
def get_img_by_pos(self, pos):
"""获取到指定位置的帧"""
# 把指针移动到指定帧的位置
self.cap.set(cv2.CAP_PROP_POS_FRAMES, pos)
# cap.read() 返回值介绍：
# ret 布尔值，表示是否读取到图像
# frame 为图像矩阵，类型为 numpy.ndarray.
ret, frame = self.cap.read()
return ret, frame
def get_frame_pos(self):
"""生成需要获取的帧的位置，使用了惰性求值"""
step = self.fps / self.fps_for_html
# 如果未指定
if not self.time_interval:
self.frames_count = int(self.frames_count_all / step) # 更新count
return (int(step * i) for i in range(self.frames_count))
# 如果指定了
start, end = self.time_interval
pos_start = int(self.fps * start)
pos_end = int(self.fps * end)
self.frames_count = int((pos_end - pos_start) / step) # 更新count
return (pos_start + int(step * i) for i in range(self.frames_count))
def get_imgs(self):
assert self.cap.isOpened()
for i in self.get_frame_pos():
ret, frame = self.get_img_by_pos(i)
if not ret:
print("读取失败，跳出循环")
break
yield self.resize(frame) # 惰性求值
# 结束时要释放空间
self.cap.release()
def get_char(self, gray):
percent = gray / 255 # 转换到 0-1 之间
index = int(percent * (len(self.pixels) - 1)) # 拿到index
return self.pixels[index]
def get_json_pic(self, img):
"""测试阶段，不实用"""
json_pic = []
# 宽高刚好和size相反，要注意。（这是numpy的特性。。）
height, width, channel = img.shape
# 转换成灰度图，用来选择合适的字符
img_gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
for y in range(height):
line = []
for x in range(width):
r, g, b = img[y][x]
gray = img_gray[y][x]
char = self.get_char(gray)
line.append([[int(r), int(g), int(b)], char])
json_pic.append(line)
return json.dumps(json_pic)
def write_html_with_json(self, file_name):
"""测试阶段，不实用"""
mp3_path = self.video2mp3()
time_start = time()
with open(file_name, 'w') as html:
# 要记得设置monospace等宽字体，不然没法玩
html.write('<!DOCTYPE html>'
'<html>'
'<body style="font-family: monospace; font-size: small; font-weight: bold; text-align: center; line-height: 0.8;">'
'<div class="video-panel"></div>'
f'<audio src="{mp3_path.name}" autoplay controls></audio>'
'</body>'
'<script>'
'var frames=[\n')
try:
i = 0
for img in self.get_imgs():
json_pic = self.get_json_pic(img)
html.write(f"{json_pic},")
if i % 20:
print(f"进度：{i/self.frames_count * 100:.2f}%, 已用时：{time() - time_start:.2f}")
i += 1
finally:
html.write('\n];\n'
f'let fps={self.fps_for_html};\n'
f'{play_chars_js}'
'</script>\n'
'</html>')
def main():
# 视频路径，换成你自己的
video_path = "ceshi.mp4"
video2html = VideoToHtml(video_path, fps_for_html=8)
video2html.set_width(120)
html_name = Path(video_path).with_suffix(".html").name
video2html.write_html_with_json(html_name)
if __name__ == "__main__":
main()
总结
以上所述是小编给大家介绍的Python3视频转字符动画的实例代码,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对软件开发网网站的支持！
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