[MPlayer-users] [BUG] ratecontrol.c:693: ff_rate_estimate_qscale: Assertion `pict_type == rce->new_pict_type' failed.

[vitko]

Today I was reviewing encoding tips at

http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-enc-libavcodec.html#menc-feat-dvd-mpeg4-lavc-encoding-options

and was playing with "very high quality" options suggestion, albeit with 2 pass 
mode. Suggested options

    -lavcopts vcodec=mpeg4:mbd=2:mv0:trell:v4mv:cbp:last_pred=3:predia=2:dia=2: \
    vmax_b_frames=2:vb_strategy=1:precmp=2:cmp=2:subcmp=2:preme=2:qns=2:vpass=2

end with

    ...
    [VE_LAVC] High quality encoding selected (non-realtime)!
    [mpeg4 @ 0x86a25b0]b_frame_strategy must be 0 on the second pass
    Could not open codec.
    ...

Ok, let vb_strategy = 0, so with revised opts

    -lavcopts vcodec=mpeg4:mbd=2:mv0:trell:v4mv:cbp:last_pred=3:predia=2:dia=2: \
    vmax_b_frames=2:vb_strategy=0:precmp=2:cmp=2:subcmp=2:preme=2:qns=2:vpass=2

I get

    ...
    videocodec: libavcodec (720x304 fourcc=34504d46 [FMP4])
    [VE_LAVC] High quality encoding selected (non-realtime)!
    Pos:   0.0s      2f ( 0%)  0.16fps Trem:   0min   0mb  A-V:0.004 [0:0]
    1 duplicate frame(s)!
    Writing header...
    ODML: Aspect information not (yet?) available or unspecified, not writing 
vprp header.
    Setting audio delay to 0.040s.
    Writing header...
    ODML: Aspect information not (yet?) available or unspecified, not writing 
vprp header.
    Setting audio delay to 0.040s.
    [mpeg4 @ 0x86a25b0]Error, Invalid timestamp=1, last=1  A-V:0.012 [0:0]
    Writing header...
    ODML: Aspect information not (yet?) available or unspecified, not writing 
vprp header.
    Setting audio delay to 0.040s.
    Pos:   0.1s      5f ( 0%)  0.40fps Trem:   0min   0mb  A-V:0.016 [0:0]
    1 duplicate frame(s)!
    mencoder: ratecontrol.c:693: ff_rate_estimate_qscale: Assertion `pict_type 
== rce->new_pict_type' failed.

(and my bash script ends with SIGABRT).

Is it a bug, or am I forcing mencoder to do something absurd?

I'm running last week or so CVS code.

Vitezslav Kotrla