[MPlayer-users] mencoder suggested bitrate strange

[Steven M. Schultz]

Greetings -

	I to encode a DVD to divx using the 3-pass method and observed 
	something strange - the suggested bitrates were all higher than the
	original DVD.   The DVD is, according to mencoder, at 5000.0 kbps
	but the "Recommended video bitrate" values are 6477, 6993 and 8026
	respectively.

	That seems strange.   I chose a value of 1000 and proceeded with the
	encoding run - looks ok so far.

mencoder -dvd 1 -chapter 2-7 -vop scale=640:480 -sws 2 -oac mp3lame -lameopts vbr=3:br=224:q=4 -ovc frameno -o frameno.avi


MEncoder CVS-020427-16:30-2.95.3 (C) 2000-2002 Arpad Gereoffy (see DOCS!)

Reading /users/sms/.mplayer/codecs.conf: can't open '/users/sms/.mplayer/codecs.conf': No such file or directory
Reading /usr/local/share/mplayer/codecs.conf: 34 audio & 92 video codecs
CPU vendor name: GenuineIntel  max cpuid level: 2
CPU: Intel Celeron 2/Pentium III Coppermine,Geyserville (Type: 6, Stepping: 1)
CPUflags: Type: 6 MMX: 1 MMX2: 1 3DNow: 0 3DNow2: 0 SSE: 0 SSE2: 0
font: can't open file: /users/sms/.mplayer/font/font.desc
Font /usr/local/share/mplayer/font/font.desc loaded successfully! (206 chars)
Not an URL!
File not found: 'frameno.avi'
Reading disc structure, please wait...
There are 1 titles on this DVD.
There are 13 chapters in this DVD title.
There are 1 angles in this DVD title.

libdvdread: Attempting to retrieve all CSS keys
libdvdread: This can take a _long_ time, please be patient

libdvdread: Get key for /VIDEO_TS/VIDEO_TS.VOB at 0x0000012f
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_01_0.VOB at 0x0000016e
libdvdread: Elapsed time 0
libdvdread: Get key for /VIDEO_TS/VTS_01_1.VOB at 0x0000027e
libdvdread: Elapsed time 0
libdvdread: Found 1 VTS's
libdvdread: Elapsed time 0
DVD successfully opened!
DVD start=14637 end=0  
success: format: 0  data: 0x1C96800 - 0x0
header block 1 size: 0
Detected MPEG-PS file format!
VIDEO:  MPEG2  720x480  (aspect 2)  29.97 fps  5000.0 kbps (625.0 kbyte/s)
[V] filefmt:2  fourcc:0x10000002  size:720x480  fps:29.97  ftime:=0.0334
Detected audio codec: [dvdpcm] drv:8 (Uncompressed DVD PCM)
Selecting Audio Decoder: [dvdpcm] Uncompressed DVD PCM audio decoder
AUDIO: srate=48000  chans=2  bps=2  sfmt=0x10  ratio: 192000->192000
MP3 audio selected
Writing AVI header...
Pos: 201.3s   6032f ( 0%)  93fps Trem:   0min   0mb  A-V:-0.067 [0:219]
duplicate 1 frame(s)!!!    
Pos: 812.2s  24341f ( 0%)  96fps Trem:   0min   0mb  A-V:-0.068 [0:218]
duplicate 1 frame(s)!!!    
Pos: 812.4s  24347f ( 0%)  96fps Trem:   0min   0mb  A-V:-0.055 [0:218]
Writing AVI index...
Fixup AVI header...
Recommended video bitrate for 650MB CD: 6477
Recommended video bitrate for 700MB CD: 6993
Recommended video bitrate for 800MB CD: 8026

Video stream:    0.959 kbit/s  (119 bps)  size: 97388 bytes  812.448 secs  24347 frames

Audio stream:  218.748 kbit/s  (27343 bps)  size: 22228992 bytes  812.952 secs

*** free_stream() called ***

	It's not a big problem (easy to pick a sane value) but it did seem 
	weird enough to mention.

	Cheers,
	Steven Schultz
	sms at 2bsd.com