If tags are not displayed this means that mplayer wasn't able to psras eand display them. To test run mplayer with -identify -verbowse options and see if tags are displayed. If they are displayed, post your file somewhere and send me a link. If tags are not displayed - sorry, I can't help you...
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I tested my OGG files using the command you said, and those tags DOES show up! I used the command:
mplayer -identify -verbose 3 "Britney Spears - Baby One More Time (q03).ogg"
And the relative output is:
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Searching demuxer type for filename Britney Spears - Baby One More Time (q03).ogg ext: .ogg
Trying demuxer 18 based on filename extension
Ogg : Found a stream with serial=1771665278
==> Found audio stream: 0
Ogg : stream 0 is vorbis
CACHE2_SEEK: 0x0 <= 0x2708EE (0x2000) <= 0x2B279E
Ogg stream length (granulepos): 9318036
CACHE2_SEEK: 0x0 <= 0x0 (0x2B279E) <= 0x2B279E
Ogg demuxer : found 1 audio stream, 0 video stream and 0 text stream
Ogg file format detected.
==========================================================================
Opening audio decoder: [libvorbis] Ogg/Vorbis audio decoder
dec_audio: Allocating 4096 + 65536 = 69632 bytes for output buffer.
New dp: 0x863c518 ds=0x863c1e8 pts=0.000 len=30 flag=0
Name: Baby One More Time (q03)
New dp: 0x863c518 ds=0x863c1e8 pts=0.000 len=176 flag=0
New dp: 0x863c518 ds=0x863c1e8 pts=0.000 len=3832 flag=0
OggVorbisComment: TITLE=Baby One More Time (q03)
OggVorbisComment: ARTIST=Britney Spears
OggVorbisComment: ALBUM=Baby One More Time
OggVorbisComment: DATE=1999
OggVorbisComment: TRACKNUMBER=01
OggVorbisComment: GENRE=Pop
OggVorbis: Bitstream is 2 channels, 44100Hz, 112000bit/s VBR
OggVorbis: Encoded by: Xiph.Org libVorbis I 20040629
OggVorbis: Init OK!
AUDIO: 44100 Hz, 2 ch, 16 bit (0x10), ratio: 14000->176400 (112.0 kbit)
Selected audio codec: [vorbis] afm:libvorbis (OggVorbis Audio Decoder)
==========================================================================
ID_FILENAME=Britney Spears - Baby One More Time (q03).ogg
ID_AUDIO_CODEC=vorbis
ID_AUDIO_FORMAT=65534
ID_AUDIO_BITRATE=112000
ID_AUDIO_RATE=44100
ID_AUDIO_NCH=2
ID_LENGTH=211
Checking audio filter chain for 44100Hz/2ch/16bit -> 44100Hz/2ch/16bit...
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See the "OggVorbisComment" outputs, all tag information are there. So I think kino2 should be able to extract these information and display them. However mplayer cannot extract tag information from FLAC file.