ffmpeg libx264

ffmpeg libx264的faster参数用于调节编码速度和质量的平衡。该参数可以通过在命令行中使用“-preset faster”来设置。使用faster参数可以加快编码速度，但会牺牲一定的视频质量。请注意，libx264有多个预设参数可供选择，包括ultrafast、superfast、veryfast、faster、fast、medium、slow、slower和veryslow。不同的预设参数会在编码速度和视频质量之间做出不同的平衡。如果需要更快的编码速度，可以尝试使用更快的预设参数。但是请注意，使用更快的预设参数会导致视频质量的损失。

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。