====
root@starslite [~]# ffmpeg -i vdosong.mp4 -f flv -vcodec flv -r 30 -b 512000 -s 400x300 -aspect 1.33333333333 -acodec libmp3lame -ab 128000 -ar 22050 -map_meta_data /home/user/public_html/files/videos/testme.flv:/home/user/vdosong.mp4 /home/user/public_html/files/videos/testme.flv
====
PS : /home/user/public_html/files/videos/testme.flv is the path of out put file and
vdosong.mp4 is source file inside the current directory(ie /home/user/).
You can also try to use padding. Here is the exact command :
=====
root@starslite [~]#ffmpeg -i vdosong.mp4 -f flv -vcodec flv -r 30 -b 512000 -s 400x300 -aspect 1.33333333333 -vf 'pad=0:0:0:0:black' -acodec libmp3lame -ab 128000 -ar 22050 -map_meta_data /home/liveghos/public_html/files/videos/testme.flv:/home/liveghos/vdosong.mp4 /home/liveghos/public_html/files/videos/testme.flv
=====
By : blog.snapshotit.com

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