[libav-bugs] [Bug 1056] New: HAP encode quality

bugzilla at libav.org bugzilla at libav.org
Tue May 2 14:41:12 CEST 2017


https://bugzilla.libav.org/show_bug.cgi?id=1056

            Bug ID: 1056
           Summary: HAP encode quality
           Product: Libav
           Version: git HEAD
          Hardware: Other
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: ---
         Component: libavcodec
          Assignee: bugzilla at libav.org
          Reporter: keith at corpimaging.com

Created attachment 666
  --> https://bugzilla.libav.org/attachment.cgi?id=666&action=edit
Notice the more substantial color banding in the area encoded with FFMPG

I am not sure you would call this a bug... but it certainly stops me from using
FFMPEG for HAP encoding - so I am hoping to get it solved.

I'm trying to understand why I am getting substantially worse results while
encoding to HAP using FFMPEG vs. Adobe Media Encoder. My problem is I need to
do Chuncks encoding (which cannot be set using AME) but the results from FFMPEG
are not up to quality.
See comparison results here:
https://www.dropbox.com/s/4fakivsytefl60c/HAP%20Test.tif?dl=1

Here is my FF command line:
ffmpeg.exe -i "H:_Render\test.mov" -vcodec hap -format hap_q
"H:_Render\output.mov"

Here is the source file:
https://www.dropbox.com/s/ccf3g2rlm6fddwq/test%20hap%20encode.mov?dl=1

AME is set to HAP Q, Quality=100, Render at Max Depth (not that any of those
settings makes a difference if my understanding is correct).
Any ideas on how I can get the matching quality from FFMPEG?

Thanks!
kt

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