Info about chroma upsampling

[Shinji-kun]

I'll post a sample later. My video is still blurry and grainy. The color is dull and the quality is bad overall, even though I am encoding it to X264.

Does anyone know how to increase sharpness, reduce the blurring, clouding effect and increase the overall quality? Please mention the Avisynth plugins that would be used. Fixing the chroma upsampling has NOT helped these other problems.

[roozhou]

what's with nvidia cards do i still need chroma upsampling with a pixel shader in mpc-hc on a gt220?
If you are viewing low resolution video under fullscreen, the YV12 chroma upsampling shader in mpc-hc will lead to two resizing routines. 1st is upscaling YV12 to RGB32 at original resolution, and 2nd is upscaling RGB32 to fullscreen. If you are not using shader, it will be upscaled only once. The more resizing you do, the worse image quality you get.

[Shinji-kun]

I am trying to encode another video from the same DVD set. There are many recurring issues in this video as well and even some worse ones.

From the attached images, you can see some type of chroma or combing artifacts. The general quality of the video was blurry and very grainy. Does anyone know how to fix these problems?

[Steveo08]

If you are viewing low resolution video under fullscreen, the YV12 chroma upsampling shader in mpc-hc will lead to two resizing routines. 1st is upscaling YV12 to RGB32 at original resolution, and 2nd is upscaling RGB32 to fullscreen. If you are not using shader, it will be upscaled only once. The more resizing you do, the worse image quality you get.



so it's better to watch a movie without the pixel shader for chroma upsampling?

[roozhou]

so it's better to watch a movie without the pixel shader for chroma upsampling?
Yes. The chroma upsampling shader is only needed when your video card driver is doing something wrong.

[Steveo08]

ok, thank you!

[Shinji-kun]

I have tried all the suggestions in this thread but MPC still shows pixelation for on the edges of red objects. This DOES NOT happen when I view the same MKV (X264) files in vdub or AvsP. I think the problem may be with ffdshow. How can I fix the upsampling?

[Soulhunter]

May I point out that my info-post is from 2006 and perhaps no more valid due to 1 billion changes in the drivers/decoders/players that took place in the last 4 years? :3

[Shinji-kun]

May I point out that my info-post is from 2006 and perhaps no more valid due to 1 billion changes in the drivers/decoders/players that took place in the last 4 years? :3

Well, whatever the case, I still have some type of aliasing that only appears on the chroma. I tried getting the most recent ffdshow and changing various setting but no luck. What do you suggest?

On a random note, is DVDfabDecrypter v5 freeware or trialware and if trialware does it still work when the trial period "expires"?