ffmpeg提高视频清晰度 ffmpeg分辨率支持 _ffmpeg

关于音视频，相信大家都看过电影（视频），听过音乐（音频），至少应该都知道mp4是视频文件， mp3是音频文件。
对于一个音视频文件，都有哪些属性呢？以视频为例，我们可以通过 ffmpeg -i 命令查看媒体文件的信息。

? ffmpeg -i r1ori.mp4ffmpeg version 4.1 Copyright (c) 2000-2018 the FFmpeg developersbuilt with Apple LLVM version 10.0.0 (clang-1000.10.44.4)configuration: --prefix=/usr/local/Cellar/ffmpeg/4.1 --enable-shared --enable-pthreads --enable-version3 --enable-hardcoded-tables --enable-avresample --cc=clang --host-cflags='-I/Library/Java/JavaVirtualMachines/jdk1.8.0_251.jdk/Contents/Home/include -I/Library/Java/JavaVirtualMachines/jdk1.8.0_251.jdk/Contents/Home/include/darwin' --host-ldflags= --enable-ffplay --enable-gpl --enable-libmp3lame --enable-libopus --enable-libsnappy --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-lzma --enable-chromaprint --enable-frei0r --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libfdk-aac --enable-libfontconfig --enable-libfreetype --enable-libgme --enable-libgsm --enable-libmodplug --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-librsvg --enable-librtmp --enable-librubberband --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtesseract --enable-libtwolame --enable-libvidstab --enable-libwavpack --enable-libwebp --enable-libzmq --enable-opencl --enable-openssl --enable-videotoolbox --enable-libopenjpeg --disable-decoder=jpeg2000 --extra-cflags=-I/usr/local/Cellar/openjpeg/2.3.0/include/openjpeg-2.3 --enable-nonfreelibavutil56\. 22.100 / 56\. 22.100libavcodec58\. 35.100 / 58\. 35.100libavformat58\. 20.100 / 58\. 20.100libavdevice58\.5.100 / 58\.5.100libavfilter7\. 40.101 /7\. 40.101libavresample4\.0\.0 /4\.0\.0libswscale5\.3.100 /5\.3.100libswresample3\.3.100 /3\.3.100libpostproc55\.3.100 / 55\.3.100Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'r1ori.mp4':Metadata:major_brand: isomminor_version: 512compatible_brands: isomiso2avc1mp41encoder: Lavf58.20.100Duration: 00:00:58.53, start: 0.000000, bitrate: 1870 kb/sStream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 544x960, 1732 kb/s, 29.83 fps, 29.83 tbr, 11456 tbn, 59.67 tbc (default)Metadata:handler_name: VideoHandlerStream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)Metadata:handler_name: SoundHandler

除了视频的元信息，还包括了更多我们当初编译的配置，你可以选择 -hide_banner 参数来隐藏这些信息，完整的命令如下

?ffmpeg -i r1ori.mp4 -hide_bannerInput #0, mov,mp4,m4a,3gp,3g2,mj2, from 'r1ori.mp4':Metadata:major_brand: isomminor_version: 512compatible_brands: isomiso2avc1mp41encoder: Lavf58.20.100Duration: 00:00:58.53, start: 0.000000, bitrate: 1870 kb/sStream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 544x960, 1732 kb/s, 29.83 fps, 29.83 tbr, 11456 tbn, 59.67 tbc (default)Metadata:handler_name: VideoHandlerStream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 129 kb/s (default)Metadata:handler_name: SoundHandlerAt least one output file must be specified

我们主要看几个数据