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I'm running two more tests now without sampler to see what the end file size is. Maybe this was the ticket to optimize CQ mode :idea: -kwag |
I just finished two 5 minute encodes with both GOP's The visual difference, at least to me, is remarkable. 8O
The file size for GOP 1-12-2-1-24 was 24,338KB and for 1-12-1-1-24 was 24,339KB :mrgreen: 1KB difference :mrgreen: Now I'm running the same test on another 5 minute section. The lobby scene 8) I'll edit this post. Running second test ...... Done!, File size for 1-12-2-1-24 is 42,066KB File size for 1-12-1-1-24 is 42,487KB This was on the lobby scene which is a very active high action part. That's 421KB larger for the 1-12-1-1-24. Not that much, considering a 5 minute clip full of action, and the quality difference is just worth it 8O :D Now, to encode the complete movie, again :x -kwag |
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Yes, it's 1-12-2-1-24 Edit: I just edited the post -kwag |
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Could you run just one more test with the 1-12-1-1-24 and the BETA-1 matrix, and see if the artifacts are still there :?: I just want to be sure that it's really the values below 8, or the GOP combination. Maybe with the IBP GOP the artifacts won't appear :!: -kwag |
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I hope you guys get the new GOP and CQ optimizations done soon..I've got lots to encode - the Star Trek reruns began today :lol: I don't want to encode the series with lower quality if there's a new, great improvement coming just 'round the corner :wink:
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SansGrip,
I look like this :teeth:, waiting on your result before the :sun: goes down :mrgreen: |
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I've been doing some tests with the new GOP, CQ and CQ_VBR. Here's my verdict: CQ_VBR mode is better for shorter movies (say, 90mins at 528x480 or 120mins at 352x480, or whatever) where you can afford to use Blockbuster. It really does improve the picture quality significantly wrt blockiness. Personally, I would even drop the audio down a notch to get less blockiness, but that's just me :). CQ mode is better when you have a borderline case for a particular resolution. Since it quantizes low frequencies much more aggressively, it can spend more bits on higher-frequency stuff and thus you see reduced Gibbs etc. and an overall nicer quality. Unfortunately, you do get blockiness. That seems to be unavoidable with this mode. As far as the new GOP goes, it definitely reduces CQ mode blocks noticibly. Perhaps it's stealing some bits back into low-freq areas from high-freq areas, because I see no detrimental effects from the change. Hence I give it a thumbs up for CQ :). It doesn't have much effect on CQ_VBR mode, though, other than a significant increase in file size (2 CQ_VBR levels). It gets a thumbs down for CQ_VBR mode ;). And that... is my final answer :mrgreen:. |
@kwag
Those artifacts are still visible with the new GOP and beta-1 :(. |
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Side note: I finished my encode of "The Matrix" with the new GOP, and 8O 8O 8O that's what it looks like :D Final size 666,669KB ( :spook: ) which I had estimated 687. But my Sampler() size was ~11.3MB and the required sample was 11.45MB, so the prediction is right on the ball with this GOP too :) Edit: I'm using TMPGEnc 2.59 PLUS -kwag |
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Not only that, but it could be happening in areas where it's unlikely you'll see it. I have a theory that it requires several of these in the same area to be really visible on casual inspection, perhaps caused by strong vertical or horizontal edges around a very low-frequency area. Or something like that ;). Quote:
Just out of interest, take a look through the final encode using VirtualDub (use the brightness/contrast filter to increase the brightness quite a bit) and I think you'll find one of those artifacts with enough looking. I've seen them several times with various sources using the notch matrix. |
OK SansGrip, that will be my assignment for the rest of the night. Matrix cleanup and de-artifacting :D
BTW, here's a piece of the full encode on "The Matrix" with the new GOP. It's only about 11 seconds: http://www.kvcd.net/test-newmat-cq-.mpg (No audio) just renamed the .m1v to .mpg so people can play it on WinDVD, etc :wink: -kwag |
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Is that LBR or 352x240-PLUS? |
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Kwag,
In your latest "Matrix" sample, did you use NEW GOP (1-12-1-1-24) with original KVCD matrix or Notch beta-1 matrix? With NEW GOP, do we need blockbuster (noise or dither) at all? |
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Gaudi |
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LoadPlugin("C:\encoding\MPEG2DEC.dll") -kwag |
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