Advantages of Trellis RD?

What happens if I try to use Trellis with an MPEG type quant like HVS-good? Does XviD just disable Trellis?

Source: The Matrix - Lobby Shootout / 3:07 min. @ 25fps / 1024x576 pix. (Lanczos) Results: Quantizer2 / No B-Frames / H.263 / VHQ 0 Size: 123.623.424 Bytes / Avg. PSNR: 47.97 / Time: About 04:58 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 1 Size: 124.694.528 Bytes / Avg. PSNR: 48.57 / Time: About 06:29 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 2 Size: 123.168.768 Bytes / Avg. PSNR: 48.57 / Time: About 09:48 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 3 Size: 122.978.304 Bytes / Avg. PSNR: 48.56 / Time: About 13:05 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 4 Size: 121.458.688 Bytes / Avg. PSNR: 48.54 / Time: About 16:43 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 0 Size: 142.090.240 Bytes / Avg. PSNR: 47.89 / Time: About 04:59 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 1 Size: 143.366.144 Bytes / Avg. PSNR: 48.16 / Time: About 06:53 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 2 Size: 140.619.776 Bytes / Avg. PSNR: 48.18 / Time: About 10:53 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 3 Size: 140.079.104 Bytes / Avg. PSNR: 48.18 / Time: About 14:47 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 4 Size: 136.732.672 Bytes / Avg. PSNR: 48.17 / Time: About 19:43 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 0 / Trellis Size: 122.200.064 Bytes / Avg. PSNR: 48.00 / Time: About 05:30 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 1 / Trellis Size: 122.939.392 Bytes / Avg. PSNR: 48.57 / Time: About 07:10 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 2 / Trellis Size: 121.387.008 Bytes / Avg. PSNR: 48.56 / Time: About 10:10 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 3 / Trellis Size: 121.141.248 Bytes / Avg. PSNR: 48.56 / Time: About 13:35 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 4 / Trellis Size: 119.625.728 Bytes / Avg. PSNR: 48.53 / Time: About 17:26 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 0 / Trellis Size: 139.116.544 Bytes / Avg. PSNR: 47.85 / Time: About 05:42 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 1 / Trellis Size: 140.228.608 Bytes / Avg. PSNR: 48.11 / Time: About 07:35 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 2 / Trellis Size: 137.605.120 Bytes / Avg. PSNR: 48.14 / Time: About 11:40 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 3 / Trellis Size: 137.111.552 Bytes / Avg. PSNR: 48.14 / Time: About 15:34 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 4 / Trellis Size: 133.941.248 Bytes / Avg. PSNR: 48.13 / Time: About 20:30 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 0 / QPel Size: 129.626.112 Bytes / Avg. PSNR: 47.80 / Time: About 06:56 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 1 / QPel Size: 129.744.896 Bytes / Avg. PSNR: 48.62 / Time: About 09:03 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 2 / QPel Size: 128.079.872 Bytes / Avg. PSNR: 48.61 / Time: About 16:32 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 3 / QPel Size: 128.034.816 Bytes / Avg. PSNR: 48.60 / Time: About 23:10 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 4 / QPel Size: 127.442.944 Bytes / Avg. PSNR: 48.59 / Time: About 26:42 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 0 / QPel Size: 152.709.120 Bytes / Avg. PSNR: 47.52 / Time: About 07:05 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 1 / QPel Size: 158.093.312 Bytes / Avg. PSNR: 48.13 / Time: About 09:16 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 2 / QPel Size: 154.347.520 Bytes / Avg. PSNR: 48.14 / Time: About 19:00 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 3 / QPel Size: 153.978.880 Bytes / Avg. PSNR: 48.13 / Time: About 27:03 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 4 / QPel Size: 152.594.432 Bytes / Avg. PSNR: 48.12 / Time: About 31:23 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 0 / QPel / Trellis Size: 128.229.376 Bytes / Avg. PSNR: 47.82 / Time: About 08:00 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 1 / QPel / Trellis Size: 127.983.616 Bytes / Avg. PSNR: 48.62 / Time: About 09:43 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 2 / QPel / Trellis Size: 126.255.104 Bytes / Avg. PSNR: 48.60 / Time: About 16:12 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 3 / QPel / Trellis Size: 126.142.464 Bytes / Avg. PSNR: 48.59 / Time: About 23:52 min. (2600XP) Quantizer2 / No B-Frames / H.263 / VHQ 4 / QPel / Trellis Size: 125.497.344 Bytes / Avg. PSNR: 48.58 / Time: About 27:23 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 0 / QPel / Trellis Size: 150.673.408 Bytes / Avg. PSNR: 47.49 / Time: About 08:19 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 1 / QPel / Trellis Size: 155.584.512 Bytes / Avg. PSNR: 48.09 / Time: About 10:34 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 2 / QPel / Trellis Size: 151.709.696 Bytes / Avg. PSNR: 48.10 / Time: About 19:50 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 3 / QPel / Trellis Size: 151.121.920 Bytes / Avg. PSNR: 48.09 / Time: About 28:07 min. (2600XP) Quantizer2 / No B-Frames / MPEG / VHQ 4 / QPel / Trellis Size: 149.676.032 Bytes / Avg. PSNR: 48.08 / Time: About 33:45 min. (2600XP) Bye

@Alexmi: No he didn't, all syskin and koepi said was that currently Trellis RD doesn't work with mpeg and custom matrices. What Devilschild and I would like to know is whether enabling trellis with mpeg (or other) harms the encode, or has no effect at all. That's because I already encoded a DVD with both features on :p , and I'd like to know if it'd be worth to redo the encode ;) (which is quite feasible now, thanks to xvid amazing speed :D 25-30 fps on average)

SysKin wrote that it IS possible to use trellis with any quant matrix now. A single short test of cruncher showed no positive effect though - but that's just one sample, don't take that for real -it's not at all scientific/empiric :-) Regards Koepi

Ummm ?... :confused: seems I didn't get anything... well I'll take your word, I'm just too lazy to redo the encode after all... Thanks anyway ! Btw, it seems vhq higher than 2 or 3 doesn't help or even harms the encode, can anyone confirm that (sorry, a bit OT)?