python ffmpeg任意提取视频帧的方法

 环境准备

1、安装 FFmpeg

音/视频工具 FFmpeg 简易安装文档

2、安装 ffmpeg-python

pip3 install ffmpeg-python

3、【可选】安装 opencv-python

pip3 install opencv-python

4、【可选】安装 numpy

pip3 install numpy

视频帧提取

准备视频素材

抖音视频素材下载：https://anoyi.com/dy/top

基于视频帧数提取任意一帧

import ffmpeg
import numpy
import cv2
import sys
import random

def read_frame_as_jpeg(in_file, frame_num):
  """
  指定帧数读取任意帧
  """
  out, err = (
    ffmpeg.input(in_file)
       .filter('select', 'gte(n,{})'.format(frame_num))
       .output('pipe:', vframes=1, format='image2', vcodec='mjpeg')
       .run(capture_stdout=True)
  )
  return out

def get_video_info(in_file):
  """
  获取视频基本信息
  """
  try:
    probe = ffmpeg.probe(in_file)
    video_stream = next((stream for stream in probe['streams'] if stream['codec_type'] == 'video'), None)
    if video_stream is None:
      print('No video stream found', file=sys.stderr)
      sys.exit(1)
    return video_stream
  except ffmpeg.Error as err:
    print(str(err.stderr, encoding='utf8'))
    sys.exit(1)

if __name__ == '__main__':
  file_path = '/Users/admin/Downloads/拜无忧.mp4'
  video_info = get_video_info(file_path)
  total_frames = int(video_info['nb_frames'])
  print('总帧数：' + str(total_frames))
  random_frame = random.randint(1, total_frames)
  print('随机帧：' + str(random_frame))
  out = read_frame_as_jpeg(file_path, random_frame)
  image_array = numpy.asarray(bytearray(out), dtype="uint8")
  image = cv2.imdecode(image_array, cv2.IMREAD_COLOR)
  cv2.imshow('frame', image)
  cv2.waitKey()

基于时间提取任意一帧

import ffmpeg
import numpy
import cv2
import sys
import random

def read_frame_by_time(in_file, time):
  """
  指定时间节点读取任意帧
  """
  out, err = (
    ffmpeg.input(in_file, ss=time)
       .output('pipe:', vframes=1, format='image2', vcodec='mjpeg')
       .run(capture_stdout=True)
  )
  return out

def get_video_info(in_file):
  """
  获取视频基本信息
  """
  try:
    probe = ffmpeg.probe(in_file)
    video_stream = next((stream for stream in probe['streams'] if stream['codec_type'] == 'video'), None)
    if video_stream is None:
      print('No video stream found', file=sys.stderr)
      sys.exit(1)
    return video_stream
  except ffmpeg.Error as err:
    print(str(err.stderr, encoding='utf8'))
    sys.exit(1)

if __name__ == '__main__':
  file_path = '/Users/admin/Downloads/拜无忧.mp4'
  video_info = get_video_info(file_path)
  total_duration = video_info['duration']
  print('总时间：' + total_duration + 's')
  random_time = random.randint(1, int(float(total_duration)) - 1) + random.random()
  print('随机时间：' + str(random_time) + 's')
  out = read_frame_by_time(file_path, random_time)
  image_array = numpy.asarray(bytearray(out), dtype="uint8")
  image = cv2.imdecode(image_array, cv2.IMREAD_COLOR)
  cv2.imshow('frame', image)
  cv2.waitKey()

相关资料
https://github.com/kkroening/ffmpeg-python/tree/master/examples

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