Improve Picture Quality

Jan 14, 2015 at 1:31 AM
Edited Jan 14, 2015 at 1:33 AM
Hello,

New to using Vidcoder. Just wanting some advice. Noticing quality loss even when using CRF 18 which I thought was supposed to be transparent to the original.

Original Bluray:
http://i1216.photobucket.com/albums/dd377/mathew_odonoghue/Good.png

Vidcoder conversion:
http://i1216.photobucket.com/albums/dd377/mathew_odonoghue/Bad.png

Not sure if anyone can notice but there is noticeable amount of blocky pixelation or colour layering. For those who don't notice:

This is what I want to see:
http://i1216.photobucket.com/albums/dd377/mathew_odonoghue/See.png

But this is what I see:
http://i1216.photobucket.com/albums/dd377/mathew_odonoghue/NoSee.png

The above is a very extreme example but it's something that really bugs me. The general quality of the movie is excellent I've only noticed this in that and similar scenes where there is dark and shades of light.

Is there any way to fix or improve this? It's already at CRF 18 which is a very high quality setting.

I was told to aim for 1/3rd the original file size. However, I have noticed that animation movies take up very little space. The Hitchhiker's Guide to the Galaxy took up over 10GB (1/3rd original size) at CRF 19 but I thought it was due to it being grainy. However, The Croods and Brave have both come in at under 4GB (around 1/6th original size). Should I just lower the CRF until I achieve 1/3rd original size and see how it goes?

VidCoder Settings:
Picture
  • Anamorphic: None (Should I use Strict or Loose, I am keeping the original resolution)
  • Cropping: Auto
Filters
  • Detelecine: Default
  • Decomb: Default
  • Deinterlace: Off
  • Denoise: Off
  • Deblock: Off
Video
  • Codec: H.264 (x264)
  • FPS: Same as source (Variable)
  • Quality: Constant Quality 18
  • Preset: Very Slow
  • Tune: Film
  • Profile High
  • Level: 4.1
Audio
First
  • Codec: AAC (avcodec)
  • Mixdown: Dobly Pro Logic II
  • Sample Rate: Same as source
  • Bitrate: 448
Second
  • Codec: Passthrough
  • Scope: AC3
Cheers.
Coordinator
Jan 14, 2015 at 7:24 AM
What you're seeing is called "color banding" and others have seen it as well:

https://vidcoder.codeplex.com/discussions/542605
Used aq-strength=1.5:no-dct-decimate=1 to deal with it

I have also read that using the HQDN3D denoiser can add color banding but it looks like you're not using it.

I found this thread talking about x264 settings to help with banding:
http://www.animemusicvideos.org/forum/viewtopic.php?f=11&t=113341
Jan 15, 2015 at 2:16 AM
Fantastic. Thank you I will check these settings out when I get home from work.

I'm very new to this so it's a learning progress. I didn't know what it was called so had a lot of trouble Google searching the problem.

Thanks again.