Python爬取視頻時(shí)長(zhǎng)場(chǎng)景實(shí)踐示例

目錄

• 簡(jiǎn)介：
• 獲取視頻時(shí)長(zhǎng)得方式
• 安裝
• 獲取視頻時(shí)長(zhǎng)得3種方式對(duì)比

簡(jiǎn)介：

在視頻相關(guān)測(cè)試場(chǎng)景下，例如：有時(shí)需要知道全部視頻得匯總時(shí)長(zhǎng)，顯然一個(gè)個(gè)打開并且手工計(jì)算耗時(shí)耗力，我們可以通過編寫進(jìn)行快速匯總。

獲取視頻時(shí)長(zhǎng)得方式

1、通過subprocess進(jìn)行獲取。

2、通過moviepy庫(kù)中VideoFileClip獲取。

3、通過cv2庫(kù)獲取。

安裝

1、subprocess：無(wú)需安裝，Python內(nèi)置。

2、moviepy：pip install moviepy。

3、cv2：pip install opencv-python

準(zhǔn)備工序：

1、當(dāng)前項(xiàng)目新增videos目錄。

2、you-get 下載幾個(gè)視頻。python：超實(shí)用下載工具you-get

如：下載了兩個(gè)短視頻

獲取視頻時(shí)長(zhǎng)得3種方式對(duì)比

import cv2import timeimport subprocessfrom moviepy.editor import VideoFileClipdef video_duration_1(filename):    start = time.time()    result = subprocess.run(["ffprobe", "-v", "error", "-show_entries",                             "format=duration", "-of",                             "default=noprint_wrappers=1:nokey=1", filename],                            stdout=subprocess.PIPE,                            stderr=subprocess.STDOUT)    end = time.time()    spend = end - start    print("獲取視頻時(shí)長(zhǎng)方法1耗時(shí)：", spend)    return float(result.stdout)def video_duration_2(filename):    start = time.time()    clip = VideoFileClip(filename)    end = time.time()    spend = end - start    print("獲取視頻時(shí)長(zhǎng)方法2耗時(shí)：", spend)    return float(clip.duration)def video_duration_3(filename):    start = time.time()    cap = cv2.VideoCapture(filename)    if cap.isOpened():        rate = cap.get(5)        frame_num = cap.get(7)        duration = frame_num / rate        end = time.time()        spend = end - start        print("獲取視頻時(shí)長(zhǎng)方法3耗時(shí)：", spend)        return duration    return -1if __name__ == '__main__':    file = r".videosmda-mkbhvebqej3cw9yh.mp4"    video_time_1 = video_duration_1(file)    print(video_time_1)    print("*" * 100)    video_time_2 = video_duration_2(file)    print(video_time_2)    print("*" * 100)    video_time_3 = video_duration_3(file)    print(video_time_3)

執(zhí)行源碼：

結(jié)論：

1、三種方式均可以正常獲取視頻時(shí)長(zhǎng)，并且準(zhǔn)確。

2、推薦使用cv2獲取視頻時(shí)長(zhǎng)，耗時(shí)最短。

實(shí)踐案例：獲取文件夾內(nèi)全部視頻總時(shí)長(zhǎng)

import cv2import osdef video_duration(dir_name):    sum_duration = 0    for root, dirs, files in os.walk(dir_name, topdown=False):        for filename in files:            cap = cv2.VideoCapture(dir_name + "\" + filename)            if cap.isOpened():                rate = cap.get(5)                frame_num = cap.get(7)                duration = frame_num / rate                sum_duration += duration    return sum_durationif __name__ == '__main__':    file = r".videos"    total_video_time = video_duration(file)    print(f"{file} 目錄下全部視頻總時(shí)長(zhǎng)為：{total_video_time}秒")

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