The smaller the number, the higher the output quality and the larger the output size. Adjusting -crf can change the output quality. One-pass CRF is a commonly used conventional encoding method.
One-pass CRF (Constant Rate Factor) uses the default mode: slow. In addition, you can refer to the online list of libx264 preset modes or find help in the/usr/local/share/ffmpeg directory. You can manually adjust some options (for example, window size: -s 640×480). Sudo checkinstall -pkgname=ffmpeg -pkgversion "4:SVN-r`LANG=C svn info | grep Revision | awk ''`" -backup=no -deldoc=yes -fstrans=no -defaultĮasy way to output high-quality video using FFmpeg and x264 is to use the preset mode of libx264 in FFmpeg. configure -enable-gpl -enable-version3 -enable-nonfree -enable-postproc -enable-libfaac -enable-libmp3lame -enable-libopencore-amrnb -enable-libopencore-amrwb -enable-libtheora -enable-libvorbis -enable-libvpx -enable-libx264 -enable-libxvid -enable-x11grab Sudo checkinstall -pkgname=x264 -pkgversion "2:0.`grep X264_BUILD x264.h -m1 | cut -d' ' -f3`.`git rev-list HEAD | wc -l`+git`git rev-list HEAD -n 1 | head -c 7`" -backup=no -deldoc=yes -fstrans=no -default Sudo apt-get install build-essential subversion git-core checkinstall yasm texi2html libfaac-dev libmp3lame-dev libopencore-amrnb-dev libopencore-amrwb-dev libsdl1.2-dev libtheora-dev libvorbis-dev libvpx-dev libx11-dev libxfixes-dev libxvidcore-dev zlib1g-dev # Install all FFmpeg and x264 support packages Sudo apt-get remove ffmpeg x264 libx264-dev #Uninstall the existing x264, libx264-dev, FFmpeg Sudo checkinstall -pkgname=lame-ffmpeg -pkgversion="3.98.4" -backup=no -default -deldoc=yes The methods of installing, using and upgrading FFmpeg under Ubuntu are as follows: Since the copyright has not yet been determined, although many websites across the country are using h.264 encoding, they are likely to be troubled by copyright issues in the future, so the official Ubuntu source does not provide h.264 encoding by default, which requires us to compile by hand Install FFmpeg's h.264 support to enable it to encode mp4 files.
X264 can encode high-quality h.264 video, and the iPad must be h.264 encoded or mpeg-4 encoded video to play normally. FFmpeg is a powerful video and audio codec tool under Ubuntu.
0 kommentar(er)
