python中视频音频的剪辑与处理实现案例代码

视频：尺寸裁剪

import cv2


def extract_video_roi(src_video_path, dst_video_path, roi_start, roi_end):
    cap = cv2.VideoCapture(src_video_path)
    if not cap.isOpened():
        print(f"无法打开视频文件：{src_video_path}")
        return

    width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
    height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
    fps = cap.get(cv2.CAP_PROP_FPS)

    fourcc = cv2.VideoWriter_fourcc(*"mp4v")
    out = cv2.VideoWriter(dst_video_path, fourcc, fps, (roi_end[0] - roi_start[0], roi_end[1] - roi_start[1]))

    while cap.isOpened():
        ret, frame = cap.read()
        if not ret:
            break

        roi_frame = frame[roi_start[1]:roi_end[1], roi_start[0]:roi_end[0]]
        out.write(roi_frame)

    cap.release()
    out.release()


# 示例用法
src_video_path = "test.mp4"
dst_video_path = "test3.mp4"
roi_start = (978, 178)
roi_end = (1684, 969)

extract_video_roi(src_video_path, dst_video_path, roi_start, roi_end)

图片：尺寸裁剪

def crop_images(folder_path, result_path, a, b, c, d):
    # 检查输入路径是否存在，如果不存在则创建
    if not os.path.exists(result_path):
        os.makedirs(result_path)

    # 遍历文件夹内的所有图片文件
    for filename in os.listdir(folder_path):
        if filename.endswith(".jpg") or filename.endswith(".png"):
            # 打开图片文件
            image = Image.open(os.path.join(folder_path, filename))

            # 裁剪图片
            cropped_image = image.crop((a, b, c, d))

            # 保存裁剪后的图片
            cropped_image.save(os.path.join(result_path, filename))

            # 关闭图片文件
            image.close()


folder_path = "标定1"
result_path = "标定2"
a, b, c, d = 84, 193, 1638, 934
crop_images(folder_path,result_path, a, b, c, d)

视频：每秒提取一张图片

import cv2
import os


def extract_frames(video_path, result_folder):
    # 创建结果文件夹
    os.makedirs(result_folder, exist_ok=True)

    # 打开视频文件
    cap = cv2.VideoCapture(video_path)

    frame_count = 0
    saved_count = 0
    # fps = cap.get(cv2.CAP_PROP_FPS)  # 获取视频的帧率
    frame_interval = int(cap.get(cv2.CAP_PROP_FPS))  # 设置帧采样间隔为1秒
    while cap.isOpened():
        # 读取视频帧
        ret, frame = cap.read()

        if not ret:
            break

        frame_count += 1
        # 每秒保存一帧
        if frame_count % frame_interval == 0:
            saved_count += 1

            # 保存帧到结果文件夹
            # frame_path = os.path.join(result_folder, f"{saved_count}.jpg")
            frame_path = os.path.join(result_folder, '%s.jpg' % saved_count)
            print(frame_path)
            cv2.imwrite(frame_path, frame)

    # 释放视频文件
    cap.release()


# 文件夹路径不能有中文！！！！！！
video_path, result_folder = 'test3.mp4', 'new_folder'
extract_frames(video_path, result_folder)

视频音频：倍速，合并，裁剪

注意，下面的start和end单位是秒数，比如你想截取视频第一分钟的片段，那么start=0，end=60。

from moviepy.editor import *


def video_clip(file_name, save_name, start, end):
    """视频剪辑"""
    clip = VideoFileClip(file_name).subclip(start, end)
    clip.write_videofile(save_name)


def audio_clip(file_name, save_name, start, end):
    """音频剪辑"""
    audio = AudioFileClip(file_name).subclip(start, end)
    audio.write_audiofile(save_name)


def video2audio(file_name, save_name):
    """视频转音频"""
    # video = CompositeVideoClip([VideoFileClip(file_name).subclip(50, 60)])
    # video.write_videofile(save_name)
    my_audio_clip = AudioFileClip(file_name)
    my_audio_clip.write_audiofile(save_name)


def video_contact(files, save_name):
    """视频合并"""
    files = [VideoFileClip(i) for i in files]
    final_clip = concatenate_videoclips(files)
    final_clip.write_videofile(save_name)


def audio_contact(files, save_name):
    """音频合并"""
    files = [AudioFileClip(i) for i in files]
    final_clip = concatenate_audioclips(files)
    final_clip.write_audiofile(save_name)


def change_speed(file, save_name, speed):
    """改变速度"""
    clip = VideoFileClip(file)
    video_1 = clip.speedx(speed)
    video_1.write_videofile(save_name)


def get_gif(file, save_name, start, end):
    """视频转gif"""
    clip = VideoFileClip(file).subclip(start, end)
    clip.write_gif(save_name, fps=5)  # 生成之后的文件小,fps决定了文件大小


if __name__ == "__main__":
    pass

图片：转为视频

import cv2
import os
from PIL import Image

def PicToVideo(imgPath, videoPath, fps):
    images = os.listdir(imgPath)  # 获取所有图片名称
    images.sort(key=lambda x: int(x[:-4]))  # 对图片进行排序
    fourcc = cv2.VideoWriter_fourcc(*'mp4v')  # 设置视频的编码格式
    im = Image.open(imgPath + images[0])  # 获取图片信息
    videoWriter = cv2.VideoWriter(videoPath, fourcc, fps, im.size, isColor=True)  # 创建一个videoWriter对象，用于将图片保存为视频的一部分
    for im_name in images:
        print("已经载入图片" + im_name)
        frame = cv2.imread(imgPath + im_name)
        videoWriter.write(frame)
    videoWriter.release()  # 释放
    print("视频制作完毕")


if __name__ == "__main__":
    # imgPath:图片的保存文件夹
    # videoPath:视频路径
    # fps：帧率
    # 注意：图片大小要一致
    imgPath = "data/"
    videoPath = "result.mp4"
    fps = 1
    PicToVideo(imgPath, videoPath, fps)

图片：批量转灰度图

import cv2
import os


def to_gray(input_path, output_path):
    images = os.listdir(input_path)
    if not os.path.exists(output_path):
        os.makedirs(output_path)
    for image in images:
        print(image)
        input_image = os.path.join(input_path, image)
        output_image = os.path.join(output_path, image)
        image = cv2.imread(input_image, cv2.IMREAD_GRAYSCALE)
        cv2.imwrite(output_image, image)


if __name__ == '__main__':
    input_path = "right"  # 要处理的图片所在的文件夹
    output_path = "right2"  # 处理完的图片放在这里
    to_gray(input_path, output_path)

图片：改变图片尺寸

if __name__ == "__main__":
    path = "no.png"
    save = "no2.png"
    pic = Image.open(path)
    pic.thumbnail((50, 50))
    pic.save(save, "png")

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