ffmpeg gpu
ls ..|xargs -I @ ffmpeg -i '../@' -acodec copy -vcodec libx264 '@' -hwaccel cuvid
Duration: 00:45:30.22, start: 0.000000, bitrate: 2446 kb/s
Stream #0:0[0x1](und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 2348 kb/s, 25 fps, 25 tbr, 12800 tbn (default)
Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 93 kb/s (default)
ffmpeg -i 12.mp4 -c:a copy -c:v hevc -b:v 1200k h.mp4
-r 25
-s 1920x1080
-ss 00:00:05 -to 00:00:10
-ss 00:00:10 -t 00:05:00
-vf "hqdn3d"
-vf "eq=brightness=0.1:saturation=1.5"
-f concat -safe 0 -i filelist.txt -c copy
filelist.txt:
file 'video1.mp4'
file 'video2.mp4'
file 'video3.mp4'
-map 0
-c copy
-vf "crop=400:300:100:100"
-filter:v "crop=400:300:0:0"
-c:v libvvenc
H.266/VVC
--enable-libvvenc
-f rawvideo -pixel_format yuv420p out.yuv
Every single time you reencode you will lose quality. If you reencode twice you will lose more quality than if you reencode once. There is absolutely no benefit for not using the original. If you tune for SSIM and then measure the SSIM you can get some idea of how much has been lost.
#git clone https://code.videolan.org/videolan/x264.git
#git clone https://bitbucket.org/multicoreware/x265_git.git
#git clone https://github.com/fraunhoferhhi/vvenc
#git clone https://code.videolan.org/videolan/dav1d.git
#git clone https://github.com/mstorsjo/fdk-aac
#curl -O -L http://downloads.sourceforge.net/project/lame/lame/3.100/lame-3.100.tar.gz && tar xzf lame-3.100.tar.gz && rm lame-3.100.tar.gz
#curl -O -L https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2 && tar xzf ffmpeg-snapshot.tar.bz2 && rm ffmpeg-snapshot.tar.bz2
#curl -O -L https://ffmpeg.org/releases/ffmpeg-7.0.2.tar.gz && tar xzf ffmpeg-7.0.2.tar.gz && rm ffmpeg-7.0.2.tar.gz
export d=$PWD
mkdir -p ffmpeg_build/lib/pkgconfig && mkdir ffmpeg_build/bin
cd vvenc && mkdir build && cd build
cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX="$d/ffmpeg_build" -DENABLE_SHARED:bool=on ..
make -j 8
make install
cd ../..
cd x264
PKG_CONFIG_PATH="$d/ffmpeg_build/lib/pkgconfig" ./configure --prefix="$d/ffmpeg_build" --bindir="$d/ffmpeg_build/bin" --enable-shared --enable-debug
make -j 8
make install
cd ..
cd x265_git && mkdir builds && cd builds
cmake -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX="$d/ffmpeg_build" -DENABLE_SHARED:bool=on ../source
make -j 8
make install
cd ../..
cd fdk-aac
autoreconf -fiv
./configure --prefix="$d/ffmpeg_build" --enable-debug
make -j 8
make install
cd ..
tar xzf ffmpeg-snapshot.tar.bz2
cd ffmpeg
PATH="$d/ffmpeg_build/bin:$PATH" PKG_CONFIG_PATH="$d/ffmpeg_build/lib/pkgconfig" ./configure \
--prefix="$d/ffmpeg_build" \
--pkg-config-flags="--static" \
--extra-cflags="-I$d/ffmpeg_build/include" \
--extra-ldflags="-L$d/ffmpeg_build/lib" \
--extra-libs=-lpthread \
--extra-libs=-lm \
--bindir="$d/ffmpeg_build/bin" \
--enable-gpl \
--enable-libx264 \
--enable-libx265 \
--enable-libvvenc \
--enable-nonfree \
--enable-libfdk_aac\
--enable-debug \
--disable-stripping\
--enable-shared
make -j 8
make install
cd ..
Build FFmpeg with libvvdec, libvvenc, and fdk-aac
brew install libxml2 ffmpeg nasm # macOS-only; if on Linux, use your native package manager. Package names may differ.
git clone https://github.com/fraunhoferhhi/vvenc
git clone https://github.com/fraunhoferhhi/vvdec
git clone https://github.com/mstorsjo/fdk-aac
cd vvenc && mkdir build && cd build
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local ..
sudo cmake --build . --target install -j $nproc
cd ../../
cd vvdec && mkdir build && cd build
cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local ..
sudo cmake --build . --target install -j $nproc
cd ../../
cd fdk-aac && ./autogen.sh && ./configure
make -j
sudo make install
cd ../
git clone --depth=1 https://github.com/MartinEesmaa/FFmpeg-VVC
cd FFmpeg-VVC
export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
./configure --enable-libfdk-aac --enable-libvvenc --enable-libvvdec --enable-static --enable-pic --enable-libxml2 --pkg-config-flags="--static" --enable-sdl2
make -jvvencapp -i input.y4m --preset slow --qpa on --qp 20 -c yuv420_10 -o output.266
./x264 input_1920x1080.yuv -o a.264
本文内容包括：
- 在Linux环境下安装FFmpeg
- 通过命令行实现视频格式识别和转码
- 有Nvidia显卡的情况下，在Linux下使用GPU进行视频转码加速的方法
FFmpeg编译安装
在FFmpeg官网https://ffmpeg.org/download.html可以下载到ubunto/debian的发行包，其他Linux发行版需自行编译。同时，如果要使用GPU进行硬件加速的话，也是必须自己编译FFmpeg的，所以本节将介绍从源码编译安装FFmpeg的方法（基于RHEL/Centos）
安装依赖工具
yum install autoconf automake bzip2 cmake freetype-devel gcc gcc-c++ git libtool make mercurial pkgconfig zlib-devel
准备工作
在$HOME下创建ffmpeg_sources目录
编译并安装依赖库
本节中的依赖库基本都是必须的，建议全部安装
nasm
汇编编译器，编译某些依赖库的时候需要
cd ~/ffmpeg_sources
curl -O -L http://www.nasm.us/pub/nasm/releasebuilds/2.13.02/nasm-2.13.02.tar.bz2
tar xjvf nasm-2.13.02.tar.bz2
cd nasm-2.13.02
./autogen.sh
./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin"
make
make install
yasm
汇编编译器，编译某些依赖库的时候需要
cd ~/ffmpeg_sources
curl -O -L http://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz
tar xzvf yasm-1.3.0.tar.gz
cd yasm-1.3.0
./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin"
make
make install
libx264
H.264视频编码器，如果需要输出H.264编码的视频就需要此库，所以可以说是必备
cd ~/ffmpeg_sources
git clone --depth 1 http://git.videolan.org/git/x264
cd x264
PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --enable-static
make
make install
libx265
H.265/HEVC视频编码器。
如果不需要此编码器，可以跳过，并在ffmpeg的configure命令中移除--enable-libx265
cd ~/ffmpeg_sources
hg clone https://bitbucket.org/multicoreware/x265
cd ~/ffmpeg_sources/x265/build/linux
cmake -G "Unix Makefiles" -DCMAKE_INSTALL_PREFIX="$HOME/ffmpeg_build" -DENABLE_SHARED:bool=off ../../source
make
make install
libfdk_acc
AAC音频编码器，必备
cd ~/ffmpeg_sources
git clone --depth 1 --branch v0.1.6 https://github.com/mstorsjo/fdk-aac.git
cd fdk-aac
autoreconf -fiv
./configure --prefix="$HOME/ffmpeg_build" --disable-shared
make
make install
libmp3lame
MP3音频编码器，必备
cd ~/ffmpeg_sources
curl -O -L http://downloads.sourceforge.net/project/lame/lame/3.100/lame-3.100.tar.gz
tar xzvf lame-3.100.tar.gz
cd lame-3.100
./configure --prefix="$HOME/ffmpeg_build" --bindir="$HOME/bin" --disable-shared --enable-nasm
make
make install
libops
OPUS音频编码器
如果不需要此编码器，可以跳过，并在ffmpeg的configure命令中移除--enable-libopus
cd ~/ffmpeg_sources
curl -O -L https://archive.mozilla.org/pub/opus/opus-1.2.1.tar.gz
tar xzvf opus-1.2.1.tar.gz
cd opus-1.2.1
./configure --prefix="$HOME/ffmpeg_build" --disable-shared
make
make install
libogg
被libvorbis依赖
cd ~/ffmpeg_sources
curl -O -L http://downloads.xiph.org/releases/ogg/libogg-1.3.3.tar.gz
tar xzvf libogg-1.3.3.tar.gz
cd libogg-1.3.3
./configure --prefix="$HOME/ffmpeg_build" --disable-shared
make
make install
libvorbis
Vorbis音频编码器
如果不需要此编码器，可以跳过，并在ffmpeg的configure命令中移除--enable-libvorbis
cd ~/ffmpeg_sources
curl -O -L http://downloads.xiph.org/releases/vorbis/libvorbis-1.3.5.tar.gz
tar xzvf libvorbis-1.3.5.tar.gz
cd libvorbis-1.3.5
./configure --prefix="$HOME/ffmpeg_build" --with-ogg="$HOME/ffmpeg_build" --disable-shared
make
make install
libvpx
VP8/VP9视频编/解码器
如果不需要此编/解码器，可以跳过，并在ffmpeg的configure命令中移除--enable-libvpx
cd ~/ffmpeg_sources
git clone --depth 1 https://github.com/webmproject/libvpx.git
cd libvpx
./configure --prefix="$HOME/ffmpeg_build" --disable-examples --disable-unit-tests --enable-vp9-highbitdepth --as=yasm
make
make install
编译安装ffmpeg 3.3.8
cd ~/ffmpeg_sources
curl -O -L https://ffmpeg.org/releases/ffmpeg-3.3.8.tar.bz2
tar xjvf ffmpeg-3.3.8.tar.bz2
cd ffmpeg-3.3.8
PATH="$HOME/bin:$PATH" PKG_CONFIG_PATH="$HOME/ffmpeg_build/lib/pkgconfig" ./configure \
--prefix="$HOME/ffmpeg_build" \
--pkg-config-flags="--static" \
--extra-cflags="-I$HOME/ffmpeg_build/include" \
--extra-ldflags="-L$HOME/ffmpeg_build/lib" \
--extra-libs=-lpthread \
--extra-libs=-lm \
--bindir="$HOME/bin" \
--enable-gpl \
--enable-libfdk_aac \
--enable-libfreetype \
--enable-libmp3lame \
--enable-libopus \
--enable-libvorbis \
--enable-libvpx \
--enable-libx264 \
--enable-libx265 \
--enable-nonfree
make
make install
hash -r
验证安装
ffmpeg -h
使用FFmpeg
识别视频信息
通过ffprobe命令识别并输出视频信息
ffprobe -v error -show_streams -print_format json <input>
为方便程序解析，将视频信息输出为json格式，样例如下：
{
"streams": [
{
"index": 0,
"codec_name": "h264",
"codec_long_name": "H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10",
"profile": "High",
"codec_type": "video",
"codec_time_base": "61127/3668400",
"codec_tag_string": "avc1",
"codec_tag": "0x31637661",
"width": 1920,
"height": 1080,
"coded_width": 1920,
"coded_height": 1080,
"has_b_frames": 0,
"sample_aspect_ratio": "0:1",
"display_aspect_ratio": "0:1",
"pix_fmt": "yuv420p",
"level": 40,
"color_range": "tv",
"color_space": "bt709",
"color_transfer": "bt709",
"color_primaries": "bt709",
"chroma_location": "left",
"refs": 1,
"is_avc": "true",
"nal_length_size": "4",
"r_frame_rate": "30/1",
"avg_frame_rate": "1834200/61127",
"time_base": "1/600",
"start_pts": 0,
"start_time": "0.000000",
"duration_ts": 61127,
"duration": "101.878333",
"bit_rate": "16279946",
"bits_per_raw_sample": "8",
"nb_frames": "3057",
"disposition": {
"default": 1,
"dub": 0,
"original": 0,
"comment": 0,
"lyrics": 0,
"karaoke": 0,
"forced": 0,
"hearing_impaired": 0,
"visual_impaired": 0,
"clean_effects": 0,
"attached_pic": 0,
"timed_thumbnails": 0
},
"tags": {
"rotate": "90",
"creation_time": "2018-08-09T09:13:33.000000Z",
"language": "und",
"handler_name": "Core Media Data Handler",
"encoder": "H.264"
},
"side_data_list": [
{
"side_data_type": "Display Matrix",
"displaymatrix": "\n00000000: 0 65536 0\n00000001: -65536 0 0\n00000002: 70778880 0 1073741824\n",
"rotation": -90
}
]
},
{