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，可以参考我的另一篇文章：windows ffmpeg安装部署_阿良的博客-CSDN博客
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。
总结
没什么好总结的。
