[MEncoder-users] error decoding h264

[Lucas Pereira Gomes Linard]

Hi,
I've tried to conver a mp4 or mkv file (the codec is h264) with many
commands but always get the same error.
"Skipping frame!
[h264 @ 0xda4220]no frame!60.58fps Trem:   4min 321mb  A-V:0.037
[4954:192]
Error while decoding frame!
Pos:   4.3s    141f ( 0%) 61.07fps Trem:   4min 340mb  A-V:0.067
[4840:192]
Skipping frame!
[h264 @ 0xda4220]no frame!61.29fps Trem:   4min 339mb  A-V:0.037
[4840:192]
Error while decoding frame!
[h264 @ 0xda4220]no frame!61.72fps Trem:   4min 337mb  A-V:0.040
[4840:192]
Error while decoding frame!
Pos:   4.3s    144f ( 0%) 62.15fps Trem:   4min 336mb  A-V:0.043
[4840:192]
1 duplicate frame(s)!"

I'm using the command found at the mplayer documents to convert a file
to a dvd (mpg)

mencoder -oac lavc -ovc lavc -of mpeg -mpegopts format=dvd:tsaf \
  -vf scale=720:480,harddup -srate 48000 -af lavcresample=48000 \
  -lavcopts vcodec=mpeg2video:vrc_buf_size=1835:vrc_maxrate=9800:vbitrate=5000:\
keyint=18:vstrict=0:acodec=ac3:abitrate=192:aspect=16/9 -ofps 30000/1001 \
  -o movie.mpg movie.avi