171 lines
5.2 KiB
Markdown
171 lines
5.2 KiB
Markdown
# 基于Ubuntu源码编译ffmpeg
|
||
## 编译SDL2（可选）
|
||
```shell
|
||
https://github.com/libsdl-org/SDL/releases/tag/release-2.30.8 # 下载源码
|
||
cd sdl/source/folder
|
||
./configure --prefix=/usr/local
|
||
make
|
||
sudo make install
|
||
```
|
||
## 安装ffmpeg依赖
|
||
1. 安装包管理工具 aptitude
|
||
aptitude 与 apt-get一样，是 Debian 系中功能极其强大的包管理工具。 与 apt-get 不同的是，aptitude 在处理依赖问题上更佳一些，当 aptitude 在删除一个包时，会同时删除本身所依赖的包。
|
||
```shell
|
||
sudo apt install aptitude
|
||
```
|
||
2. 安装 yasm、nasm
|
||
yasm、nasm 是两个汇编器，编译 FFmpeg 需要用到。
|
||
安装命令：
|
||
```shell
|
||
sudo aptitude install yasm nasm
|
||
```
|
||
3. 其他依赖
|
||
FFmpeg 的安装依赖许多库（如，音频编码库，音频解码库，视频编解码库等），这里不介绍每个库的具体作用，按照命令安装即可。
|
||
```shell
|
||
sudo apt-get install libgmp3-dev
|
||
sudo apt install pkg-config
|
||
sudo apt install gnutls-bin
|
||
sudo aptitude install libaom-dev
|
||
sudo aptitude install libass-dev
|
||
sudo aptitude install libbluray-dev
|
||
sudo aptitude install libfdk-aac-dev
|
||
sudo aptitude install libmp3lame-dev
|
||
sudo aptitude install libopencore-amrnb-dev
|
||
sudo aptitude install libopencore-amrwb-dev
|
||
sudo aptitude install libopenmpt-dev
|
||
sudo aptitude install libopus-dev
|
||
sudo aptitude install libshine-dev
|
||
sudo aptitude install libsnappy-dev
|
||
sudo aptitude install libsoxr-dev
|
||
sudo aptitude install libspeex-dev
|
||
sudo aptitude install libtheora-dev
|
||
sudo aptitude install libtwolame-dev
|
||
sudo aptitude install libvo-amrwbenc-dev
|
||
sudo aptitude install llibvpx-dev
|
||
sudo aptitude install libwavpack-dev
|
||
sudo aptitude install libwebp-dev
|
||
sudo aptitude install libx264-dev
|
||
sudo aptitude install libx265-dev
|
||
sudo aptitude install libxvidcore-dev
|
||
sudo aptitude install liblzma-dev
|
||
```
|
||
## 编译ffmpeg
|
||
1. 从官网下载源码
|
||
2. 进入根目录编译
|
||
```shell
|
||
./configure --enable-shared --enable-gpl --enable-sdl2 --enable-libx264 --enable-libx265 --enable-nvdec --enable-nvenc --enable-cuda --enable-cuvid
|
||
# 其中 --enable-gpl --enable-libx264 --enable-libx265 必不可少 --enable-sdl2 是ffmpeg播放器需要的
|
||
# 由于需要硬件英伟达显卡加速编解码 --enable-nvdec --enable-nvenc --enable-cuda --enable-cuvid
|
||
# --enable-shared 使make install时，将动态库也正确安装，否则运行ffmpeg时，会显示缺少动态库
|
||
|
||
make
|
||
sudo make install
|
||
# 安装完后，确保安装目录，确保已经配置好动态库搜索的路径，
|
||
```
|
||
如果需要硬件英伟达显卡加速编解码，需要安装相关依赖
|
||
```shell
|
||
sudo apt install libdssialsacompat-dev
|
||
git clone https://git.videolan.org/git/ffmpeg/nv-codec-headers.git
|
||
cd nv-codec-headers
|
||
make
|
||
sudo make install
|
||
# ./ffmpeg -hwaccels 查看支持哪些硬件编码
|
||
```
|
||
|
||
**编译ffmeg arm64版本**
|
||
|
||
在源码目录下创建buildarm64.sh，内容如下
|
||
|
||
```shell
|
||
#!/bin/bash
|
||
|
||
export NDK=~/android/android-ndk-r20b #这里配置先你的 NDK 路径
|
||
TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/linux-x86_64
|
||
|
||
# 编译到安卓上，尽可能小一些(--enable-small)，只是用来解码，也就取消编译封装编码相关的
|
||
function build_android
|
||
{
|
||
|
||
./configure \
|
||
--disable-programs \
|
||
--disable-avdevice \
|
||
--disable-encoders \
|
||
--disable-muxers \
|
||
--disable-filters \
|
||
--enable-neon \
|
||
--enable-gpl \
|
||
--disable-sdl2 \
|
||
--disable-postproc \
|
||
--disable-debug \
|
||
--enable-small \
|
||
--enable-static \
|
||
--enable-shared \
|
||
--disable-doc \
|
||
--enable-ffmpeg \
|
||
--disable-ffplay \
|
||
--disable-ffprobe \
|
||
--disable-avdevice \
|
||
--disable-doc \
|
||
--disable-symver \
|
||
--prefix=$PREFIX \
|
||
--cross-prefix=$CROSS_PREFIX \
|
||
--target-os=android \
|
||
--arch=$ARCH \
|
||
--cpu=$CPU \
|
||
--cc=$CC \
|
||
--cxx=$CXX \
|
||
--enable-cross-compile \
|
||
--sysroot=$SYSROOT \
|
||
--extra-cflags="-Os -fpic $OPTIMIZE_CFLAGS" \
|
||
--extra-ldflags="$ADDI_LDFLAGS"
|
||
|
||
|
||
make clean
|
||
make -j16
|
||
make install
|
||
|
||
echo "============================ build android arm64-v8a success =========================="
|
||
|
||
}
|
||
|
||
#arm64-v8a
|
||
ARCH=arm64
|
||
CPU=armv8-a
|
||
API=21
|
||
CC=$TOOLCHAIN/bin/aarch64-linux-android$API-clang
|
||
CXX=$TOOLCHAIN/bin/aarch64-linux-android$API-clang++
|
||
SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot
|
||
CROSS_PREFIX=$TOOLCHAIN/bin/aarch64-linux-android-
|
||
PREFIX=$(pwd)/android/$CPU
|
||
OPTIMIZE_CFLAGS="-march=$CPU"
|
||
|
||
build_android
|
||
|
||
|
||
```
|
||
|
||
```shell
|
||
chomd +x buildarm64.sh
|
||
./buildarm64.sh
|
||
# 编译好后，对应的源文件和库文件会安装到./android/armv-v8a中
|
||
```
|
||
|
||
## 硬编码
|
||
|
||
```c++
|
||
// 与软编码相比，没有很多额外的配置
|
||
// 仅仅是在查找编码器时按名称查找 hevc_nvenc ,其余和软编码一样
|
||
auto pCodec = avcodec_find_encoder_by_name("hevc_nvenc");
|
||
// ...
|
||
// 其次就是注意软编码出来的每一帧数据 前面都会带有SEI增强帧，关键帧后面才是I帧或者P帧
|
||
auto naluHeader = (pkt->data[4] & 0x7E) >> 1; // 前四个字节是0x00 00 00 01 分隔符
|
||
if (naluHeader == 39) { // SEI
|
||
auto header = getNextSplit(pkt->data, pkt->size); // 往后找，跳过这个SEI
|
||
if (header == nullptr)
|
||
return 0;
|
||
naluHeader = ((*header) & 0x7E) >> 1;
|
||
// cout << "naluHeader: " << naluHeader << endl;
|
||
}
|
||
```
|
||
|