目录
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。
分享:
What is real? How do you define 'real'? If you're talking about what you can feel, what you can smell, what you can taste and see, then 'real' is simply electrical signals interpreted by your brain. ——《黑客帝国》
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