[FFmpeg-user] How to correct Windows cmd line to fix - "Incompatible pixel format 'bgra' for codec 'mpeg2video', auto-selecting format 'yuv420p' " ?

[M el]

How to correct this Windows Command Line...

C:\Documents and Settings\All Users\Documents\My
Videos\Originals>c:\utilities\ffmpeg\ffmpeg -i video1.avi -vcodec
mpeg2video -b 400k -s 620x480 -aspect 4:3 -acodec mp2 -ab 128k -ar
22050 -f mpegts video1.mpg

To avoid this error message?

"Incompatible pixel format 'bgra' for codec 'mpeg2video',
auto-selecting format 'yuv420p'

Thanks for any help.