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最近在一个web页面的开发过程中，发现标签只支持h264的视频播放，导致部分浏览器视频播放不出来。因此想到ffmpeg将视频格式进行转换。
（1）ffmpeg下载地址：
https://ffmpeg.zeranoe.com/builds/
（2）下载之后配置下环境变量
（3）咱们先检查下视频格式信息
ffmpeg -i video.mp4
PS C:\Users\Administrator\Desktop\temp\video> ffmpeg -i .\video.mp4 ffmpeg version git-2020-05-04-5767a2e Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 9.3.1 (GCC) 20200328
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libsrt --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --disable-w32threads --enable-libmfx --enable-ffnvcodec --enable-cuda-llvm --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt --enable-amf
libavutil 56. 43.100 / 56. 43.100
libavcodec 58. 82.100 / 58. 82.100
libavformat 58. 42.102 / 58. 42.102
libavdevice 58. 9.103 / 58. 9.103
libavfilter 7. 80.100 / 7. 80.100
libswscale 5. 6.101 / 5. 6.101
libswresample 3. 6.100 / 3. 6.100
libpostproc 55. 6.100 / 55. 6.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '.\video.mp4':
Metadata:
major_brand : avc1
minor_version : 0
compatible_brands: isomavc1
creation_time : 2020-04-30T05:49:19.000000Z
Duration: 00:00:16.08, start: 0.000000, bitrate: 6055 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709/unknown/unknown), 1920x1080, 6052 kb/s, 25 fps, 25 tbr, 25k tbn, 50k tbc (default)
Metadata:
creation_time : 2020-04-30T05:49:19.000000Z
handler_name : GPAC ISO Video Handler
At least one output file must be specified
PS C:\Users\Administrator\Desktop\temp\video>
（4）将视频格式转换为h264格式
ffmpeg -i video.mp4 -vcodec h264 video1.mp4
