Mobile optimized HTML5 video encoding using FFMPEG

ffmpeg_mobile

# webm
ffmpeg -y -i snp-inst3.mp4 \
       -filter:v scale=640:360,setsar=1/1 -pix_fmt yuv420p \
       -vpre libvpx-720p -b:v 500k -r:v 25/1 -force_fps \
       -c:a libvorbis -b:a 80k -pass 1 out_inst.webm

# mp4       
ffmpeg -y -i snp-inst3.mp4 \
       -filter:v scale=640:360,setsar=1/1 -pix_fmt yuv420p \
       -c:v libx264 -preset:v slow -profile:v baseline \
       -x264opts level=3.0:ref=1 -b:v 700k -r:v 25/1 -force_fps \
       -movflags +faststart -c:a libfaac -b:a 80k -pass 1 out_inst.mp4