I-Frame Only @ 15Mbps MPEG2 Capture ?

[Cheesemeister2000]

System :

Abit KR7A-133 RAID
AMD Athlon XP1700
512Mb DDR
ATI All-In-Wonder 128 Rage Pro
Soundblaster Live! 1024 Player
Win 98SE
MMC 7.6
DirectX v8.1

Scenario :

I have given up on AVI capture ( YUY2 and Huffyuv as they drop frames )
I can capture perfectly using 720x576 Mpeg2 @ 15Mbps.
Just wondering what the best setup would be at that bitrate ?
Would it be best to stick with the MMC default ? or would it be better to got to I-Frame only ? Heard lots of people say that over about 12Mbps there is no difference ? I know this is a hotly debated topic, but i am asking about specificaly at 15Mbps Mpeg2 capture.

Cheers

Cheesemeister2000

[fingernailX]

I capture TV from my AIW at 15Mbps, 352 by 480 (as its only "broadcast") deinterlacing on the capture and then use XMPEG or DVD2AVI 1.86 to resize to 352 X 240 XVID @ 1450 bps 2 pass VBR and audio at 96kbps MP3. Gives me an hour of very acceptable quality (DIVXPLUS playback to TV) on a $.30 CD. (Don't want to waste a $2.50 DVD-R on broadcast) By using DVD2AVI or XMPEG the conversion is kept in the YUV colorspace and with my dual cpu setup I get near realtime conversion (25-27 fps). This has proven to be the best alternative for me for broadcast sources. Capturing with anything, including DV and even uncompressed, can't compare with ripping the VOBS off a DVD. DV to MPEG1, 2 or 4 can be a time consuming process but I now have access to a Targa 3000 and Pinnacle MPEG Works. We've only done a few short DVCAM conversions to 5 Mbps vbr MPEG2 so far and its realtime and the quality is good. Can't wait to use it to transcode a 4 gig + DVD via DV capture. Anyone with Targa 3000 experience, particularly MPEG Works, please post your results!