Terrible "ghosting" on some MPEG4/AVC Encodes?

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iransofaraway
Posts: 5
Joined: Sun Mar 25, 2012 5:33 am

Terrible "ghosting" on some MPEG4/AVC Encodes?

Post by iransofaraway »

Was watching an encode of Django Unchained, and noticed "ghosting", that is, when people move on the screen, it seems like there's a slight visual blurring or artifacting going on. I loaded up MediaInfo and spit out the details:

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Format profile : Main@L4.0 
Format settings, ReFrames : 2 frames 
Bit rate : 10 000 Kbps 
Frame rate : 23.976 fps 
Color space : YUV 
Chroma subsampling : 4:2:0 
Bit depth : 8 bits 
Encoding settings : cabac=0 / ref=1 / deblock=1:0:0 / analyse=0x1:0x111 / me=umh / subme=5 / psy=1 / psy_rd=0.00:0.00 / mixed_ref=0 / me_range=16 / chroma_me=1 / trellis=0 / 8x8dct=0 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=0 / threads=6 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / constrained_intra=0 / bframes=3 / b_pyramid=0 / b_adapt=1 / b_bias=0 / direct=1 / weightb=0 / open_gop=0 / weightp=0 / keyint=240 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=abr / mbtree=1 / bitrate=10000 / ratetol=1.0 / qcomp=0.60 / qpmin=3 / qpmax=51 / qpstep=4 / ip_ratio=1.40 / aq=1:1.00 
Color primaries : BT.709 
Transfer characteristics : BT.709 
Matrix coefficients : BT.709
So-- what exactly could be causing this behavior? Loading up another encode (of Gangster Squad), it looks pristine and amazing:

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Format profile : High@L4.1 
Format settings, CABAC : Yes 
Format settings, ReFrames : 5 frames 
Bit rate : 8 188 Kbps 
Frame rate : 23.976 fps 
Color space : YUV 
Chroma subsampling : 4:2:0 
Bit depth : 8 bits 
Encoding settings : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=7 / psy=1 / psy_rd=1.00:0.00 / mixed_ref=1 / me_range=16 / chroma_me=1 / trellis=1 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=18 / lookahead_threads=3 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=3 / b_pyramid=2 / b_adapt=1 / b_bias=0 / direct=1 / weightb=1 / open_gop=0 / weightp=2 / keyint=250 / keyint_min=23 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=2pass / mbtree=1 / bitrate=8188 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / cplxblur=20.0 / qblur=0.5 / ip_ratio=1.40 / aq=1:1.00
Last edited by Rodeo on Wed May 29, 2013 4:08 pm, edited 1 time in total.
Reason: Logs must be placed in between [code] [/code] blocks

Smithcraft
Veteran User
Posts: 2691
Joined: Thu Jan 22, 2009 8:04 pm

Re: Terrible "ghosting" on some MPEG4/AVC Encodes?

Post by Smithcraft »

The encode logs would be helpful.

SC

iransofaraway
Posts: 5
Joined: Sun Mar 25, 2012 5:33 am

Re: Terrible "ghosting" on some MPEG4/AVC Encodes?

Post by iransofaraway »

Sorry, I don't have that :-/ Just the information shown.

ty2010
Posts: 72
Joined: Mon Feb 18, 2013 7:09 am

Re: Terrible "ghosting" on some MPEG4/AVC Encodes?

Post by ty2010 »

Completely different settings, even though you selected a higher bitrate for the first, cabac=0 will eat that up and then some. Ref = 1 vs 5, worse. Subme = 5 vs 7, worse. Mixed ref, trellis, 8x8dct, b_pyramid, etc. The first would have coded extremely fast in comparison though.

mduell
Veteran User
Posts: 6939
Joined: Sat Apr 21, 2007 8:54 pm

Re: Terrible "ghosting" on some MPEG4/AVC Encodes?

Post by mduell »

iransofaraway wrote:Sorry, I don't have that :-/ Just the information shown.
You cleverly posted your support request in the tiki bar to avoid the bold underlined red instructions at the top of every page telling you where to find encoding logs?

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