Python实现视频裁剪的示例代码

前言

本文提供将视频按照自定义尺寸进行裁剪的工具方法，一如既往的实用主义。

环境依赖

ffmpeg环境安装，可以参考文章：

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，上代码。

#!/user/bin/env python
# coding=utf-8
"""
@project : csdn
@author  : 剑客阿良_aliang
@file   : cut_out_pic_tool.py
@ide    : pycharm
@time   : 2022-01-20 10:38:53
"""
import os
import uuid
from ffmpy import ffmpeg
 
 
# 视频裁剪
def cut_out_video(video_path: str, output_dir: str, start_pix: tuple, size: tuple):
    ext = os.path.basename(video_path).strip().split('.')[-1]
    if ext not in ['mp4', 'avi', 'flv']:
        raise exception('format error')
    result = os.path.join(output_dir, '{}.{}'.format(uuid.uuid1().hex, ext))
    ff = ffmpeg(inputs={video_path: none},
                outputs={
                    result: '-vf crop={}:{}:{}:{} -y -threads 5 -preset ultrafast -strict -2'.format(size[0], size[1],
                                                                                                     start_pix[0],
                                                                                                     start_pix[1])})
    print(ff.cmd)
    ff.run()
    return result
 
 
if __name__ == '__main__':
    print(cut_out_video(r'c:\users\huyi\desktop\test2.mp4', r'c:\users\huyi\desktop', (0, 0), (512, 512)))

代码说明

1、cut_out_video方法参数分别为，视频地址、输出目录地址、起始像素点位置、需要裁剪的宽高。

2、做了简单的视频格式校验，如需添加，可以自己看着来。

3、最终视频名使用uuid避免重复。

4、截取的视频宽高不能超过原视频大小。

验证一下

准备的视频分辨率。

执行结果

c:\users\huyi\.conda\envs\python36\python.exe "c:\program files\jetbrains\pycharm 2020.1.3\plugins\python\helpers\pydev\pydevconsole.py" --mode=client --port=3021
import sys; print('python %s on %s' % (sys.version, sys.platform))
sys.path.extend(['d:\\spyder\\csdn', 'd:/spyder/csdn'])
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/cut_out_video_tool.py', wdir='d:/spyder/csdn')
ffmpeg -i c:\users\huyi\desktop\test2.mp4 -vf crop=512:512:0:0 -y -threads 5 -preset ultrafast -strict -2 c:\users\huyi\desktop\afc1de8879f211eca313e454e8bf1461.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
input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'c:\users\huyi\desktop\test2.mp4':
  metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : lavf58.45.100
    description     : packed by bilibili xcoder v2.0.2
  duration: 00:09:00.58, start: 0.000000, bitrate: 1558 kb/s
    stream #0:0(und): video: h264 (high) (avc1 / 0x31637661), yuv420p, 1920x1080 [sar 1:1 dar 16:9], 1556 kb/s, 23.98 fps, 23.98 tbr, 24k tbn, 47.95 tbc (default)
    metadata:
      handler_name    : videohandler
stream mapping:
  stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
press [q] to stop, [?] for help
[libx264 @ 000002069d5e7200] using sar=1/1
[libx264 @ 000002069d5e7200] using cpu capabilities: mmx2 sse2fast ssse3 sse4.2 avx fma3 bmi2 avx2
[libx264 @ 000002069d5e7200] profile constrained baseline, level 3.0, 4:2:0, 8-bit
[libx264 @ 000002069d5e7200] 264 - core 161 - h.264/mpeg-4 avc codec - copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=5 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=23 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
output #0, mp4, to 'c:\users\huyi\desktop\afc1de8879f211eca313e454e8bf1461.mp4':
  metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    description     : packed by bilibili xcoder v2.0.2
    encoder         : lavf58.45.100
    stream #0:0(und): video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 512x512 [sar 1:1 dar 1:1], q=-1--1, 23.98 fps, 24k tbn, 23.98 tbc (default)
    metadata:
      handler_name    : videohandler
      encoder         : lavc58.91.100 libx264
    side data:
      cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: n/a
frame=12961 fps=945 q=-1.0 lsize=   30056kb time=00:09:00.54 bitrate= 455.5kbits/s speed=39.4x    
video:30004kb audio:0kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.173805%
[libx264 @ 000002069d5e7200] frame i:52    avg qp:12.98  size: 25387
[libx264 @ 000002069d5e7200] frame p:12909 avg qp:15.91  size:  2278
[libx264 @ 000002069d5e7200] mb i  i16..4: 100.0%  0.0%  0.0%
[libx264 @ 000002069d5e7200] mb p  i16..4:  7.0%  0.0%  0.0%  p16..4: 27.6%  0.0%  0.0%  0.0%  0.0%    skip:65.4%
[libx264 @ 000002069d5e7200] coded y,uvdc,uvac intra: 25.4% 24.6% 3.3% inter: 10.3% 7.3% 0.2%
[libx264 @ 000002069d5e7200] i16 v,h,dc,p: 46% 20% 15% 19%
[libx264 @ 000002069d5e7200] i8c dc,h,v,p: 61% 16% 19%  4%
[libx264 @ 000002069d5e7200] kb/s:454.67
c:\users\huyi\desktop\afc1de8879f211eca313e454e8bf1461.mp4

结果视频分辨率

 

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