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Mencoder and VBR MPEG-2 settings for Mpegplayer

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nonoitall:
I'm transcoding some TV episodes to MPEG-2 for Mpegplayer using mencoder and was wondering what settings are ideal for a VBR encode?  In particular, what's typically a good maximum bitrate in order to avoid too many dropped frames?  (The source material is 23.98 fps.)  Also, when using mencoder's vrc_maxrate option, I'm required to provide a value for vrc_buf_size.  I don't really have any idea what a good value would be here for Mpegplayer. :D

Anyway, I'm sure some of the answers to my questions are somewhat subjective, but I'm just hoping you guys can give me an idea of what ballpark I should be in.  Thanks in advance!

Llorean:
You left out a rather crucial bit of information: Which player. They have varying processors and hardware that affect the playback speed dramatically.

bascule:
Surely that depends on the target device... ipod 5g cannot run fullscreen at 30fps, but the nano can

The following link opens the list of presets for use with WinFF and should be a good starting point for settings:

http://www.rockbox.org/twiki/pub/Main/PluginMpegplayer/presets.xml

nonoitall:
I'm doing several encodes for several targets, actually.  Thanks for the link to the WinFF presets - it didn't occur to me to look there.  Would those bitrates listed in the WinFF presets be fairly good maximum bitrates for mencoder?  If so, I'm still a little lost when it comes to the VRC buffer size though.

Llorean:
They're actually average bitrates for a single-pass encode. They might even be a bit low, depending on target. The Gigabeat F for example can essentially handle most bitrates you would even remotely reasonably encode 320x240 video at as far as my personal test go. Your best bet is to just pick the bitrate based on what quality you'd like to see (or try a constant quantizer scale) and then if it has performance issues lower it a bit.

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