Python实现多个视频合成一个视频的功能

前言

本文提供将多个视频拼接为一个视频的python工具代码，其中有一些限制条件，下面的代码说明会提到。

环境依赖

ffmpeg环境安装，可以参考：

本文主要使用到的不是ffmpeg，而是ffprobe也在上面这篇文章中的zip包中。

ffmpy安装：

pip install ffmpy -i https://pypi.douban.com/simple

代码

不废话了，上代码。

#!/user/bin/env python
# coding=utf-8
"""
@project : csdn
@author  : 剑客阿良_aliang
@file   : concat_video.py
@ide    : pycharm
@time   : 2021-12-23 15:23:16
"""
 
from ffmpy import ffmpeg
import os
import uuid
import subprocess
 
 
# 视频拼接
def concat(video_list: list, output_dir: str):
    if len(video_list) == 0:
        raise exception('video_list can not empty')
    _ext = check_format(video_list)
    _fps = check_fps(video_list)
    _result_path = os.path.join(
        output_dir, '{}{}'.format(
            uuid.uuid1().hex, _ext))
    _tmp_config = make_tmp_concat_config(video_list, output_dir)
    ff = ffmpeg(inputs={'{}'.format(_tmp_config): '-f concat -safe 0 -y'}, outputs={
        _result_path: '-c copy'})
    print(ff.cmd)
    ff.run()
    os.remove(_tmp_config)
    return _result_path
 
 
# 构造拼接所需临时文件
def make_tmp_concat_config(video_list: list, output_dir: str):
    _tmp_concat_config_path = os.path.join(output_dir, '{}.txt'.format(uuid.uuid1().hex))
    with open(_tmp_concat_config_path, mode='w', encoding='utf-8') as f:
        f.writelines(list(map(lambda x: 'file {}\n'.format(x), video_list)))
    return _tmp_concat_config_path
 
 
# 校验每个视频的格式
def check_format(video_list: list):
    _video_format = ''
    for x in video_list:
        _ext = os.path.splitext(x)[-1]
        if _video_format == '' and _ext != '':
            _video_format = _ext
            continue
        if _video_format != '' and _ext == _video_format:
            continue
        if _video_format != '' and _ext != _video_format:
            raise exception('inconsistent video format')
    return _video_format
 
 
# 校验每个视频的fps
def check_fps(video_list: list):
    _video_fps = 0
    for x in video_list:
        _fps = get_video_fps(x)
        if _video_fps == 0 and _fps:
            _video_fps = _fps
            continue
        if _video_fps != 0 and _fps == _video_fps:
            continue
        if _video_fps != '' and _fps != _video_fps:
            raise exception('inconsistent video fps')
    if _video_fps == 0:
        raise exception('video fps error')
    return _video_fps
 
 
# 获取视频fps
def get_video_fps(video_path: str):
    ext = os.path.splitext(video_path)[-1]
    if ext != '.mp4' and ext != '.avi' and ext != '.flv':
        raise exception('format not support')
    ffprobe_cmd = 'ffprobe -v error -select_streams v -of default=noprint_wrappers=1:nokey=1 -show_entries stream=r_frame_rate {}'
    p = subprocess.popen(
        ffprobe_cmd.format(video_path),
        stdout=subprocess.pipe,
        stderr=subprocess.pipe,
        shell=true)
    out, err = p.communicate()
    print("subprocess 执行结果：out:{} err:{}".format(out, err))
    fps_info = str(out, 'utf-8').strip()
    if fps_info:
        if fps_info.find("/") > 0:
            video_fps_str = fps_info.split('/', 1)
            fps_result = int(int(video_fps_str[0]) / int(video_fps_str[1]))
        else:
            fps_result = int(fps_info)
    else:
        raise exception('get fps error')
    return fps_result
 
 
if __name__ == '__main__':
    print(concat(['d:/tmp/100.mp4', 'd:/tmp/101.mp4'], 'c:/users/huyi/desktop'))

代码说明

1、主要拼接方法为concat，入参分别为：视频列表、输出目录。

2、该视频拼接命令对视频本身有所限制，需要保证都是相同格式的视频，其次是每个视频的fps得一致，不然最终合成的视频会无法打开或者出现花屏现象。

3、临时的拼接文件会在使用后删除。

4、最终输出的文件名为了保证唯一使用uuid。

验证一下

下面是我准备的两个视频：

执行结果

pydev console: starting.
python 3.6.13 |anaconda, inc.| (default, mar 16 2021, 11:37:27) [msc v.1916 64 bit (amd64)] on win32
runfile('d:/spyder/csdn/tool/concat_video.py', wdir='d:/spyder/csdn/tool')
subprocess 执行结果：out:b'25/1\r\n' err:b''
subprocess 执行结果：out:b'25/1\r\n' err:b''
ffmpeg -f concat -safe 0 -y -i c:/users/huyi/desktop\6d02df4b63d111eca6eee454e8bf1461.txt -c copy c:/users/huyi/desktop\6d02df4a63d111ec9dbbe454e8bf1461.mp4
ffmpeg version n4.3.1-20-g8a2acdc6da copyright (c) 2000-2020 the ffmpeg developers
  built with gcc 9.3-win32 (gcc) 20200320
  configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --enable-avisynth --enable-libdav1d --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --enable-libvidstab --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzimg --extra-cflags=-dlibtwolame_static --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
  libavutil      56. 51.100 / 56. 51.100
  libavcodec     58. 91.100 / 58. 91.100
  libavformat    58. 45.100 / 58. 45.100
  libavdevice    58. 10.100 / 58. 10.100
  libavfilter     7. 85.100 /  7. 85.100
  libswscale      5.  7.100 /  5.  7.100
  libswresample   3.  7.100 /  3.  7.100
  libpostproc    55.  7.100 / 55.  7.100
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001de4a7aebc0] auto-inserting h264_mp4toannexb bitstream filter
input #0, concat, from 'c:/users/huyi/desktop\6d02df4b63d111eca6eee454e8bf1461.txt':
  duration: n/a, start: -0.064000, bitrate: 1098 kb/s
    stream #0:0(und): audio: aac (lc) (mp4a / 0x6134706d), 16000 hz, mono, fltp, 69 kb/s
    metadata:
      handler_name    : soundhandler
    stream #0:1(und): video: h264 (main) (avc1 / 0x31637661), yuv420p, 1080x1920, 1028 kb/s, 25 fps, 25 tbr, 12800 tbn, 50 tbc
    metadata:
      handler_name    : videohandler
output #0, mp4, to 'c:/users/huyi/desktop\6d02df4a63d111ec9dbbe454e8bf1461.mp4':
  metadata:
    encoder         : lavf58.45.100
    stream #0:0(und): video: h264 (main) (avc1 / 0x31637661), yuv420p, 1080x1920, q=2-31, 1028 kb/s, 25 fps, 25 tbr, 12800 tbn, 12800 tbc
    metadata:
      handler_name    : videohandler
    stream #0:1(und): audio: aac (lc) (mp4a / 0x6134706d), 16000 hz, mono, fltp, 69 kb/s
    metadata:
      handler_name    : soundhandler
stream mapping:
  stream #0:1 -> #0:0 (copy)
  stream #0:0 -> #0:1 (copy)
press [q] to stop, [?] for help
[mov,mp4,m4a,3gp,3g2,mj2 @ 000001de4a7aebc0] auto-inserting h264_mp4toannexb bitstream filter
[mp4 @ 000001de4acdabc0] non-monotonous dts in output stream 0:1; previous: 6176768, current: 6176608; changing to 6176769. this may result in incorrect timestamps in the output file.
frame=22199 fps=0.0 q=-1.0 lsize=  119649kb time=00:14:48.05 bitrate=1103.7kbits/s speed=2.41e+03x    
video:111571kb audio:7524kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.465183%
c:/users/huyi/desktop\6d02df4a63d111ec9dbbe454e8bf1461.mp4

结果验证

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