[MEncoder-users] How to encode a DVD

[John Brown]

Jorge Peixoto de Morais Neto wrote:

>I have encoded the movie to SVCD, with the line
>
>mencoder -oac lavc -ovc lavc -of mpeg -mpegopts
>format=xsvcd:tele_src=24000/1001:tele_dest=30000/1001 -vf
>scale=480:336,expand=480:480,harddup -srate 44100 -af
>lavcresample=44100 -lavcopts
>vcodec=mpeg2video:keyint=18:vrc_buf_size=917:vbitrate=950:vrc_maxrate=2500:acodec=mp2:abitrate=128:dia=4:predia=4:trell:mbd=2:precmp=2:cmp=2:subcmp=2:vpass=1
>-o opaios.mpg opaio.avi
>
>then
>
>
>mencoder -oac lavc -ovc lavc -of mpeg -mpegopts
>format=xsvcd:tele_src=24000/1001:tele_dest=30000/1001 -vf
>scale=480:336,expand=480:480,harddup -srate 44100 -af
>lavcresample=44100 -lavcopts
>vcodec=mpeg2video:keyint=18:vrc_buf_size=917:vbitrate=985:vrc_maxrate=2500:acodec=mp2:abitrate=128:dia=4:predia=4:trell:mbd=2:precmp=2:cmp=2:subcmp=2:vpass=2
>-o opaios2.mpg opaio.avi
>
>In the second pass I used the same options except for vpass and for
>the vbitrate. I was calculating bitrate for 700 MB but then I learned
>that a SVCD can hold 800 MB.
>
...

>Some more information: when I try to play opaios2.mpg in mplayer, I get
>an audio delay and mplayer outputs this:
>
>MPlayer dev-SVN-r22984 (C) 2000-2007 MPlayer Team
>CPU: AMD Athlon(tm) XP 2600+ (Family: 6, Model: 8, Stepping: 1)
>CPUflags:  MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 0
>Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE
>112 audio & 233 video codecs
>
>Playing opaios2.mpg.
>MPEG-PS file format detected.
>VIDEO:  MPEG2  480x480  (aspect 1)  29.970 fps  2500.0 kbps (312.5
>kbyte/s)
>==========================================================================
>Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough VDec: vo
>config request - 480 x 480 (preferred colorspace: Mpeg PES) Could not
>find matching colorspace - retrying with -vf scale... Opening video
>filter: [scale] The selected video_out device is incompatible with this
>codec. Try appending the scale filter to your filter list,
>e.g. -vf spp,scale instead of -vf spp.
>VDecoder init failed :(
>Opening video decoder: [libmpeg2] MPEG 1/2 Video decoder
>libmpeg2-v0.4.0b Selected video codec: [mpeg12] vfm: libmpeg2 (MPEG-1
>or 2 (libmpeg2))
>==========================================================================
>==========================================================================
>Opening audio decoder: [mp3lib] MPEG layer-2, layer-3 AUDIO: 44100 Hz,
>2 ch, s16le, 128.0 kbit/9.07% (ratio: 16000->176400) Selected audio
>codec: [mp3] afm: mp3lib (mp3lib MPEG layer-2, layer-3)
>==========================================================================
>AO: [alsa] 48000Hz 2ch s16le (2 bytes per sample) Starting playback...
>VDec: vo config request - 480 x 480 (preferred colorspace: Planar YV12)
>VDec: using Planar YV12 as output csp (no 0)
>Movie-Aspect is 1.00:1 - prescaling to correct movie aspect.
>VO: [xv] 480x480 => 480x480 Planar YV12
>A:   0.3 V:   0.3 A-V:  0.058 ct:  0.003   3/  2 ??% ??% ??,?% 0 0
>demux_mpg: 24000/1001fps progressive NTSC content detected, switching
>framerate. A:   0.5 V:   0.4 A-V:  0.135 ct:  0.019   9/
>6 ??% ??% ??,?% 0 0 demux_mpg: 30000/1001fps NTSC content detected,
>switching framerate. Warning! FPS changed 23.976 -> 29.970  (-5.994005)
>[4]   ??,?% 0 0 A:   3.9 V:   3.1 A-V:  0.781 ct:  0.224 115/ 67  3%
>1%  1.3% 0 0 Exiting... (Quit)
>

1. You should specify -lavcopts aspect=4/3.

2. The MPlayer documentation does not say that 24000/1001 fps is allowed for 
SVCD, but I see that other posters have said that it is. Assuming that they 
are right, you could try -ofps 24000/1001.

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