[MEncoder-users] problem with -ss

[Sean Brady]

Hello everyone.  I'm having a problem with seeking during encoding...

running this version of mencoder:

MEncoder dev-SVN-r18712-3.4.4

Here's the command:

mencoder thefile.flv -o test.flv -of lavf -lavfopts
format=flv:i_certify_that_my_video_stream_does_not_use_b_frames -oac
mp3lame -ovc lavc -lavcopts vcodec=flv -ss 25 

-endpos  works, but -ss does not.... here's the response:

success: format: 0  data: 0x0 - 0x83591
libavformat file format detected.
VIDEO:  [FLV1]  320x240  0bpp  15.167 fps    0.0 kbps ( 0.0 kbyte/s)
[V] filefmt:35  fourcc:0x31564C46  size:320x240  fps:15.17
ftime:=0.0659
==========================================================================
Opening audio decoder: [mp3lib] MPEG layer-2, layer-3
AUDIO: 44100 Hz, 2 ch, s16le, 32.0 kbit/2.27% (ratio: 4000->176400)
Selected audio codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
==========================================================================
** MUXER_LAVF
*****************************************************************
You have certified that your video stream does not contain B frames.
REMEMBER: MEncoder's libavformat muxing is presently broken and will
generate
INCORRECT files in the presence of B frames. Moreover, due to bugs
MPlayer
will play these INCORRECT files as if nothing were wrong!
*******************************************************************************
OK, exit
Opening video filter: [expand osd=1]
Expand: -1 x -1, -1 ; -1, osd: 1, aspect: 0.000000, round: 1
==========================================================================
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffflv] vfm: ffmpeg (FFmpeg Flash video)
==========================================================================
MP3 audio selected.

Flushing video frames
Writing index...
Writing header...
Segmentation fault


Any ideas?  Seems to me there might be a problem with determining frame
information for .flv files?

Thanks for the help!

- Sean