ffmpeg libx264

FFmpeg是一个开源的音视频处理工具，libx264是FFmpeg中一个用于编码H.264视频的库。H.264是一种常用的视频编码标准，具有高压缩比和良好的视频质量。通过使用libx264库，可以将输入的视频数据编码为H.264格式的视频文件。你可以使用FFmpeg命令行工具或者通过编程调用FFmpeg库来使用libx264进行视频编码。需要注意的是，libx264在使用时需要正确设置编码参数和进行适当的优化才能达到较好的视频质量和压缩效果。

相关问题

ffmpeg libx264 linux

FFmpeg是一个开源的多媒体框架，可以在Linux系统上进行音频和视频的编解码、转码、流媒体处理等操作。libx264是FFmpeg中的一个编码器，用于将视频文件编码为H.264格式。

要在Linux上使用FFmpeg和libx264，你需要按照以下步骤进行安装：

1. 打开终端，并确保你的系统已经安装了编译工具（如gcc、make等）和必要的依赖库（如zlib、libmp3lame等）。

2. 下载FFmpeg源代码。你可以从官方网站（https://ffmpeg.org/）或使用Git命令进行下载：

   git clone https://git.ffmpeg.org/ffmpeg.git

3. 进入FFmpeg源代码目录：

   cd ffmpeg

4. 配置编译参数，并指定libx264的路径。以下是一个示例配置：

   ./configure --enable-gpl --enable-libx264 --extra-ldflags="-L/path/to/libx264/lib" --extra-cflags="-I/path/to/libx264/include"

注意将 "/path/to/libx264" 替换为你实际的libx264库路径。

5. 编译和安装FFmpeg：

   make
   sudo make install

编译过程可能需要一些时间，取决于你的系统配置和网络速度。

安装完成后，你就可以使用FFmpeg的命令行工具进行音视频处理，并使用libx264编码器进行H.264视频编码了。例如，使用以下命令将一个视频文件转码为H.264格式：

ffmpeg -i input.mp4 -c:v libx264 output.mp4

请注意，以上步骤仅适用于在Linux系统上安装FFmpeg和libx264。如果你使用的是其他操作系统，请参考相应的安装文档或资源。

VoIP应用在Ubuntu 14.04下编译FFmpeg libX264及PJSIP

1. 编译FFmpeg

1.1 安装依赖库

sudo apt-get update
sudo apt-get install build-essential autoconf automake \
    libtool libasound2-dev libpulse-dev libssl-dev \
    libv4l-dev libavcodec-dev libavformat-dev libswscale-dev \
    libavdevice-dev libxv-dev libx11-dev libxext-dev \
    libxcb1-dev libxcb-shm0-dev libxcb-xfixes0-dev \
    libxcb-shape0-dev libxcb-sync-dev libxcb-xtest0-dev \
    libxcb-util-dev libxrender-dev libfontconfig-dev \
    libfreetype6-dev libxml2-dev libexpat1-dev \
    libgl1-mesa-dev libglu1-mesa-dev libgtk2.0-dev \
    libnotify-dev libreadline-dev libsoup2.4-dev \
    libsqlite3-dev libspeexdsp-dev libspeex-dev \
    libgsm1-dev libopus-dev libogg-dev libvorbis-dev \
    libcurl4-openssl-dev liblua5.1-0-dev libidn11-dev \
    libavresample-dev libpostproc-dev libtwolame-dev \
    libmp3lame-dev libass-dev libbluray-dev libdca-dev \
    libopencore-amrnb-dev libopencore-amrwb-dev libvo-aacenc-dev \
    libvo-amrwbenc-dev libx264-dev libopenal-dev libjack-jackd2-dev \
    libssl-dev libsrtp0-dev libavfilter-dev libchromaprint-dev \
    libfdk-aac-dev libflite1-dev libgme-dev libmodplug-dev \
    libopencv-dev libopenjp2-7-dev libsnappy-dev libssh-dev \
    libwavpack-dev libwebp-dev libzmq3-dev libbs2b-dev libcelt-dev \
    libcodec2-dev libfrei0r-plugins-dev libgme-dev libilbc-dev \
    libkvazaar-dev liblilv-dev libmysofa-dev libnorm-dev \
    libopenmpt-dev librsvg2-dev librubberband-dev libvidstab-dev \
    libvoikko-dev libzvbi-dev

1.2 下载FFmpeg源码

wget -O ffmpeg-snapshot.tar.bz2 https://ffmpeg.org/releases/ffmpeg-snapshot.tar.bz2
tar xjvf ffmpeg-snapshot.tar.bz2
cd ffmpeg

1.3 编译FFmpeg

./configure --prefix=/usr/local \
--enable-gpl \
--enable-version3 \
--enable-nonfree \
--enable-postproc \
--enable-pthreads \
--enable-libfdk-aac \
--enable-libmp3lame \
--enable-libopus \
--enable-libvorbis \
--enable-libvpx \
--enable-libx264 \
--enable-libx265 \
--enable-libaom \
--enable-libopenjpeg \
--enable-libwebp \
--enable-libopus \
--enable-libspeex \
--enable-libsoxr \
--enable-libwavpack \
--enable-libass \
--enable-libbluray \
--enable-libdav1d \
--enable-libvidstab \
--enable-libzimg \
--disable-stripping \
--extra-libs=-lpthread \
--enable-openssl \
--enable-libv4l2 \
--enable-libdrm \
--enable-libxcb \
--enable-libxfixes \
--enable-zlib \
--disable-debug \
--enable-shared \
--disable-static
make -j$(nproc)
sudo make install

2. 编译libX264

2.1 安装依赖库

sudo apt-get update
sudo apt-get install nasm

2.2 下载libX264源码

wget http://download.videolan.org/pub/videolan/x264/snapshots/last_x264.tar.bz2
tar xjvf last_x264.tar.bz2
cd x264-snapshot*

2.3 编译libX264

./configure --prefix=/usr/local --enable-shared
make -j$(nproc)
sudo make install

3. 编译PJSIP

3.1 安装依赖库

sudo apt-get update
sudo apt-get install build-essential automake autoconf \
libtool libasound2-dev libpulse-dev libssl-dev \
libv4l-dev libavcodec-dev libavformat-dev libswscale-dev \
libavdevice-dev libxv-dev libx11-dev libxext-dev \
libxcb1-dev libxcb-shm0-dev libxcb-xfixes0-dev \
libxcb-shape0-dev libxcb-sync-dev libxcb-xtest0-dev \
libxcb-util-dev libxrender-dev libfontconfig-dev \
libfreetype6-dev libxml2-dev libexpat1-dev \
libgl1-mesa-dev libglu1-mesa-dev libgtk2.0-dev \
libnotify-dev libreadline-dev libsoup2.4-dev \
libsqlite3-dev libspeexdsp-dev libspeex-dev \
libgsm1-dev libopus-dev libogg-dev libvorbis-dev \
libcurl4-openssl-dev liblua5.1-0-dev libidn11-dev \
libavresample-dev libpostproc-dev libtwolame-dev \
libmp3lame-dev libass-dev libbluray-dev libdca-dev \
libopencore-amrnb-dev libopencore-amrwb-dev libvo-aacenc-dev \
libvo-amrwbenc-dev libx264-dev libopenal-dev libjack-jackd2-dev \
libssl-dev libsrtp0-dev libavfilter-dev libchromaprint-dev \
libfdk-aac-dev libflite1-dev libgme-dev libmodplug-dev \
libopencv-dev libopenjp2-7-dev libsnappy-dev libssh-dev \
libwavpack-dev libwebp-dev libzmq3-dev libbs2b-dev libcelt-dev \
libcodec2-dev libfrei0r-plugins-dev libgme-dev libilbc-dev \
libkvazaar-dev liblilv-dev libmysofa-dev libnorm-dev \
libopenmpt-dev librsvg2-dev librubberband-dev libvidstab-dev \
libvoikko-dev libzvbi-dev libopusfile-dev liboggz2-dev \
libzmq5-dev libavcodec-extra libavdevice-dev libavutil-dev

3.2 下载PJSIP源码

wget https://www.pjsip.org/release/2.10/pjproject-2.10.tar.bz2
tar xjvf pjproject-2.10.tar.bz2
cd pjproject-2.10

3.3 配置

./configure --enable-shared --disable-static --prefix=/usr/local \
--with-external-speex --with-external-srtp --with-external-gsm \
--with-external-soundtouch --with-external-pa

3.4 编译

make dep
make -j$(nproc)
sudo make install

完成后，Ubuntu 14.04下编译FFmpeg libX264及PJSIP的过程就结束了。