DVDFab Forum - Tips to improve overall quality of conversion?

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Tips to improve overall quality of conversion?

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    BD Ripper (3D Plus) Tips to improve overall quality of conversion?

    Buckle in.. this will get technical. I converted a blu-ray of Doctor Sleep and watched it on my big screen. I was disappointed with the overall quality. There were lot's of digital artifacts especially in low light scenes. That started me down the road of measuring the quality of various settings in version 11 and now version 12. Using the VMAF tool, I measure a few different clips of the video using various settings in dvdfab and then also against a FFMPEG encoded version utilizing NVENC since I have an Nvidia 20XX Turing card.

    Here are some results:
    LRLS = Lightning Record/Lightning Shrink (Nvidia 2070 Turing Card)
    SW = Software Encoder (No acceleration)
    SQ/HQ = Standard Quality/High Quality
    1Pass/2Pass = Encoding Passes
    VMAF is out of 100, PSNR out of 60, and MS_SSIM out of 1
    FFMPEG used NVENC encoding/decoding with a 5Mb/s VBR and 8Mb/s Max
    Clip 1
    DVD Fab Version Encoding Settings VMAF Score PSNR Score MS_SSIM Score
    11 LRLS HQ 2Pass 87.9577 44.5194 0.995780
    11 LRLS SQ 1Pass 87.7419 44.5210 0.995719
    12 SW SQ 1Pass 78.5874 42.3323 0.994097
    12 LRLS SQ 1Pass 88.0855 44.3956 0.997606
    FFMPEG NVENC_8M_1Pass 94.6138 49.9948 0.998656
    Clip 2
    DVD Fab Version Encoding Settings VMAF Score PSNR Score MS_SSIM Score
    11 LRLS HQ 2Pass 71.8197 30.5846 0.975837
    11 LRLS SQ 1Pass 70.5031 30.5202 0.973363
    12 SW SQ 1Pass 46.0894 27.0846 0.935390
    12 LRLS SQ 1Pass 71.7805 30.5739 0.983692
    FFMPEG NVENC_8M_1Pass 95.7707 42.3496 0.995377
    Clip 3
    DVD Fab Version Encoding Settings VMAF Score PSNR Score MS_SSIM Score
    11 LRLS HQ 2Pass 73.3437 37.1798 0.982553
    11 LRLS SQ 1Pass 72.8649 37.1548 0.981832
    12 SW SQ 1Pass 56.2030 34.3361 0.968179
    12 LRLS SQ 1Pass 73.5675 34.3361 0.968179
    FFMPEG NVENC_8M_1Pass 94.4231 46.1366 0.997327
    To ensure that the clipping wasn't a major cause (even though I was using a mostly frame-copy clipping tool) I also ran an analysis on the entire video with similar results:
    Entire Movie
    DVD Fab Version Encoding Settings VMAF Score
    11 LRLS HQ 2Pass 78.5058
    FFMPEG NVENC_8M_1Pass 94.3652
    I also repeated this test with two other movies and saw similar results. It is obvious to me that
    1. SW Encoding is maximizing speed over quality. Not unexpected of since SW Encoding can take a long time on most HW. Would be nice though to have the different profile qualities be more inline with x264 in general. It is not very good at the default settings. CABAC is disabled, CBR 9Mb/s, 8x8DCT is disabled so on.
    2. The LRLS settings for NVENC are not optimized for newer Nvidia HW. I also tried with a previous generation 1070 card with similar results
    3. FFMPEG at only 5Mb/s is generating a much higher quality file than DVDFab at 9.1Mb/s when both using Nvidia for encoding
    4. 2Pass Encoding isn't worth it and in general using HQ over SQ isn't worth it considering the change in file size
    5. DVDFab 12 has cranked up the bitrate on SQ to 9Mb/s but I see very minimal difference in the overall quality improvement
    I cannot find any way to update the settings used for LR or LS. Is there anyway to change those settings? I did find a setting for B-frame support for Turing cards and enabled it, but there was minimal difference.

    Any hidden switches for the HW based encoding?

    --Bill


    #2
    You can speak directly to the encoder in v12.x Ripper module, see this link: https://www.dvdfab.cn/tips/custom-h2...12_client_h264

    You are the only user I remember that agrees with me that 2-pass is a waste of time. I have been preaching this since Fab v8.
    Supplying DVDFab Logs in the Forum ...........................User Manual PDF for DVDFab v11................................ Guide: Using Images in Posts
    Supplying DMS Logs to Developers................................Enlarger AI FAQ.....

    Comment


      #3
      Thanks signals. Although it appears these parameters only apply to x264 encoder (i.e. software). They don't apply when using Nvidia encoding do they? For instance, if I use ffmpeg with a raw blu-ray file, I can tell it to use Nvidia decoding/encoding and get FAR better performance than asking Fab to do Lightning Shrink.
      For example this simple line:
      ffmpeg.exe -vsync 0 -hwaccel cuvid -c:v h264_cuvid -i "<input video>.mkv" -c:a copy -c:v h264_nvenc -b:v 5M -max_muxing_queue_size 400 "<output video>.mkv

      Takes a video and decode/encodes entirely with Nvidia with a max rate of 5M and the quality score is higher than using Fab. I can then tweak it even further to improve quality from there.

      If I use the encoder directly, I think I am limited to SW encoding only correct? x264 doesn't have a way to tell it to use HW encoding that I know of. I was hoping there was a way to tweak the parameters of LR/LS.

      I admit I only played with the parameter field a small amount, so maybe I'm just missing the obvious.
      Thanks for any help!!!

      --Bill

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