Doom9's Forum - View Single Post - Pls help me understand B, I & P frames and psy-rd

Kerrin Shea · 5th April 2009, 18:13

J_Darnley,

Thanks for your help. You said that with a good x264 encoder, B-frames don't have to look that bad. I use 2-pass encoding and set the "Average bitrate (kbps)."

If I increased the Average Bitrate, would B-Frames look better (sharper) or would it have no difference on PSNR?

I am presently encoding episodes of The Simpsons (Seasons I BOUGHT and PAID FOR) to create a "Best Of" DVD containing only my favorite episodes. That will save a lot of searching through discs and seasons and ejecting and re-inserting discs to get to my favorite episodes.

The Simpsons is not the most complex animation in the world--lots of solid colors.

I am using "Reference Frames" = 9 and "B-Frames" = 8. (Plus "Mixed References," "Direct Prediction" = Automatic, "Weighted B-Frames," M.E.M.=umh, "Motion Estimation Range" = 64 (the max), "Subpixel Motion Estimation" = 9 (the max), "Analysis" = All, "8x8 DCT," "Trellis"=2, "No Fast-P-Skip," "No DCT-Decimate," and "CABAC Entropy Coding."

Is my Reference Frame value too high? And is my B-Frames value too high?

Thanks

5th April 2009, 18:13	#6 \| Link
Kerrin Shea Registered User Join Date: Mar 2009 Posts: 4	J_Darnley, Thanks for your help. You said that with a good x264 encoder, B-frames don't have to look that bad. I use 2-pass encoding and set the "Average bitrate (kbps)." If I increased the Average Bitrate, would B-Frames look better (sharper) or would it have no difference on PSNR? I am presently encoding episodes of The Simpsons (Seasons I BOUGHT and PAID FOR) to create a "Best Of" DVD containing only my favorite episodes. That will save a lot of searching through discs and seasons and ejecting and re-inserting discs to get to my favorite episodes. The Simpsons is not the most complex animation in the world--lots of solid colors. I am using "Reference Frames" = 9 and "B-Frames" = 8. (Plus "Mixed References," "Direct Prediction" = Automatic, "Weighted B-Frames," M.E.M.=umh, "Motion Estimation Range" = 64 (the max), "Subpixel Motion Estimation" = 9 (the max), "Analysis" = All, "8x8 DCT," "Trellis"=2, "No Fast-P-Skip," "No DCT-Decimate," and "CABAC Entropy Coding." Is my Reference Frame value too high? And is my B-Frames value too high? Thanks Last edited by Kerrin Shea; 5th April 2009 at 18:17.