one pass: ffmpeg -i input -acodec libfaac -ab 128k -vcodec libx264 -vpre slow -crf 22(smaller value=higher quality/bitrate) -threads 0 output.mp4 2pass: Instead of using -crf you use a determined bitrate which can be useful while converting some kind of videos and permit to have a stable

Encoding – h264 – Trac [http://h264.code-shop.com/trac/wiki/Encoding]. Ffmpeg/x264 (profile High, level 3.0) (latest versions of x264) We have successfully been using ffmpeg/libx264 with two pass encoding using the following commands: infile ="video.avi" tmpfile="video_tmp.mp4" outfile="video.