[MEncoder-users] Mencoder: converting to mp4, quicktime problem

[sentenza]

Hello,

Quicktime player can't play mp4 encoded by mencoder, but others players  can
play them. I d'ont understand because mp4 encoded with ffmpeg are well
played by Quicktime player :/

To generate an Ipod video, I encoded with mencoder the video stream with
libavcodec in mpeg4 and used libavformats to specify the mp4 format. The
audio codec used is faac.

I used the following command line :

mencoder video.wmv -o test.mp4 -of lavf -ovc lavc -oac faac -lavcopts
vcodec=mpeg4:vbitrate=250:autoaspect:mbd=2:mv0:trell:v4mv:cbp:last_pred=3:predia=2:dia=2:precmp=2:cmp=2:subcmp=2:preme=2:turbo
-lavfopts format=mp4:i_certify_that_my_video_stream_does_not_use_b_frames
-vf scale=320:240 -ofps 15 -srate 44100

I don't understand because ffmpeg and mencoder use the same libavcodec and
libavformat ... So anyone have an idea about why encoded mp4 can't be played
by quicktime player ?

Regards,

-- 
Benoit