基于Python实现视频分辨率转换

前言

本文提供将视频调整分辨率的python代码，一如既往的实用主义。

环境依赖

ffmpeg环境安装，可以参考文章：

ffmpy安装：

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

代码

不废话上代码。

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @time    : 2021/12/12 14:07
# @author  : 剑客阿良_aliang
# @site    : 
# @file    : video_tool.py
 
import os
import uuid
from ffmpy import ffmpeg
 
 
# 调整视频大小
def change_size(video_path: str, output_dir: str, width: int, height: int, bit_rate=2000):
    ext = os.path.basename(video_path).strip().split('.')[-1]
    if ext not in ['mp4']:
        raise exception('format error')
    _result_path = os.path.join(
        output_dir, '{}.{}'.format(
            uuid.uuid1().hex, ext))
    ff = ffmpeg(inputs={'{}'.format(video_path): none}, outputs={
        _result_path: '-s {}*{} -b {}k'.format(width, height, bit_rate)})
    print(ff.cmd)
    ff.run()
    return _result_path

代码说明：

1、change_size方法入参分别为：视频地址、输出目录、宽度、高度，码率（默认为2000k，已经算很高了）。

2、格式校验只有mp4，可以自行添加。

3、文件名用uuid，避免重复。

验证一下

准备的视频如下：

验证代码：

if __name__ == '__main__':
    print(change_size('c:/users/yi/desktop/981.mp4', 'c:/users/yi/desktop', 960, 540))

执行结果：

e:\programdata\anaconda3\envs\pytorch\python.exe c:/users/yi/pycharmprojects/test/video_tool.py
ffmpeg -i c:/users/yi/desktop/981.mp4 -s 960*540 -b 2000k c:/users/yi/desktop\8b854c985b1411eca9982c4d54eea02b.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/yi/desktop/981.mp4':
  metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : ���ɱ�ֲ�̫��(���ݼ�����).leon.1994.directors.cut.720p.bluray
    encoder         : lavf58.45.100
    copyright       : bbs.cnxp.com(c)2009
    description     : this file is created by easy realmedia tools@!
    keywords        : ӱ�ӵ۹���ʒ
  duration: 00:00:05.64, start: 0.000000, bitrate: 1017 kb/s
    stream #0:0(und): video: h264 (high) (avc1 / 0x31637661), yuv420p, 1280x688, 881 kb/s, 23.98 fps, 23.98 tbr, 785647.00 tbn, 47.95 tbc (default)
    metadata:
      handler_name    : videohandler
    stream #0:1(und): audio: aac (lc) (mp4a / 0x6134706d), 44100 hz, stereo, fltp, 128 kb/s (default)
    metadata:
      handler_name    : soundhandler
please use -b:a or -b:v, -b is ambiguous
stream mapping:
  stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  stream #0:1 -> #0:1 (aac (native) -> aac (native))
press [q] to stop, [?] for help
[libx264 @ 000001757623e580] using cpu capabilities: mmx2 sse2fast ssse3 sse4.2 avx fma3 bmi2 avx2
[libx264 @ 000001757623e580] profile high, level 3.1, 4:2:0, 8-bit
[libx264 @ 000001757623e580] 264 - core 161 - h.264/mpeg-4 avc codec - copyleft 2003-2020 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=23 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=2000 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
output #0, mp4, to 'c:/users/yi/desktop\8b854c985b1411eca9982c4d54eea02b.mp4':
  metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : ���ɱ�ֲ�̫��(���ݼ�����).leon.1994.directors.cut.720p.bluray
    keywords        : ӱ�ӵ۹���ʒ
    copyright       : bbs.cnxp.com(c)2009
    description     : this file is created by easy realmedia tools@!
    encoder         : lavf58.45.100
    stream #0:0(und): video: h264 (libx264) (avc1 / 0x31637661), yuv420p, 960x540, q=-1--1, 2000 kb/s, 23.98 fps, 785647.00 tbn, 23.98 tbc (default)
    metadata:
      handler_name    : videohandler
      encoder         : lavc58.91.100 libx264
    side data:
      cpb: bitrate max/min/avg: 0/0/2000000 buffer size: 0 vbv_delay: n/a
    stream #0:1(und): audio: aac (lc) (mp4a / 0x6134706d), 44100 hz, stereo, fltp, 128 kb/s (default)
    metadata:
      handler_name    : soundhandler
      encoder         : lavc58.91.100 aac
frame=  122 fps= 98 q=-1.0 lsize=    1173kb time=00:00:05.01 bitrate=1914.6kbits/s speed=4.02x    
video:1087kb audio:79kb subtitle:0kb other streams:0kb global headers:0kb muxing overhead: 0.552477%
[libx264 @ 000001757623e580] frame i:1     avg qp:16.01  size: 50847
[libx264 @ 000001757623e580] frame p:31    avg qp:12.50  size: 24730
[libx264 @ 000001757623e580] frame b:90    avg qp:17.24  size:  3280
[libx264 @ 000001757623e580] consecutive b-frames:  1.6%  0.0%  0.0% 98.4%
[libx264 @ 000001757623e580] mb i  i16..4: 17.6% 53.9% 28.5%
[libx264 @ 000001757623e580] mb p  i16..4:  1.3%  3.8%  1.2%  p16..4: 23.6% 21.4% 18.5%  0.0%  0.0%    skip:30.2%
[libx264 @ 000001757623e580] mb b  i16..4:  0.1%  0.2%  0.1%  b16..8: 27.3%  8.4%  3.2%  direct: 3.6%  skip:57.2%  l0:38.3% l1:46.7% bi:14.9%
[libx264 @ 000001757623e580] final ratefactor: 13.48
[libx264 @ 000001757623e580] 8x8 transform intra:58.6% inter:57.4%
[libx264 @ 000001757623e580] coded y,uvdc,uvac intra: 65.5% 76.2% 67.7% inter: 18.4% 14.7% 4.1%
[libx264 @ 000001757623e580] i16 v,h,dc,p: 53% 16% 13% 18%
[libx264 @ 000001757623e580] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 36% 15% 21%  3%  5%  6%  4%  6%  4%
[libx264 @ 000001757623e580] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 35% 18% 13%  5%  7%  8%  5%  6%  4%
[libx264 @ 000001757623e580] i8c dc,h,v,p: 48% 22% 24%  7%
[libx264 @ 000001757623e580] weighted p-frames: y:0.0% uv:0.0%
[libx264 @ 000001757623e580] ref p l0: 63.2% 13.5% 17.3%  6.0%
[libx264 @ 000001757623e580] ref b l0: 89.6%  8.8%  1.7%
[libx264 @ 000001757623e580] ref b l1: 95.1%  4.9%
[libx264 @ 000001757623e580] kb/s:1749.39
[aac @ 00000175743fe940] qavg: 180.360
c:/users/yi/desktop\8b854c985b1411eca9982c4d54eea02b.mp4

执行效果：

ok，分辨率调整为960x540。

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