target quality (above 80%) question

[isoman2kx]

This is directed to manono (since he wrote or co-wrote the guide on autoGK or anyone else who can answer is fine too :p)

Bit of a two part question.

My first question is though in the AUTO GK guide, in talking about target quality settings...... says [quote]"I don't think there's much point in going above about 80% because then you'll lose some of the benefits of MPEG4's compression abilities."

What did you mean by going above 80% loses some of the benefits of mpeg4 compression , is this for divx or xvid and what benefits do you gain by setting it around 80% instead of like 99%?


Second Question:

Most tv episodes for me I just set at 95% and up and they seem fine.

However, on some regular movies (like Blue Collar Comedy Tour and Raw ... comedy by Eddie Murphy) movies the mid 90%'s don't seem to cut it.

The quality is decent, but I'm not sure how to describe what bugs me.

I think its the sharpness of the picture as it seems to be grainy or blocky in some areas like where theres a black wall for instance etc.

As for logs, I don't have any that I could post since I've already burned the most recently encoded movies with AUTOGK off and deleted them.

Although I am ripping/encoding CaddyShack right now at 98% , so I could post in a little while those logs.

[chilled]

you dont loose anything in terms or quality (you increase it!) but final output size is getting bigger and bigger and maybe at this point you should consider keeping the DVD as is (meaning a 1:1 copy). this is why going above 75 (70 imho) doesnt make much sense most of the times. you should not see big differences between a 75 and a 95 per cent quality encodes.
block parts on your black wall are "normal", im not expert in resolving this but it can be made with GK (or by just increasing output size or resolution or many many other settings in AGK).

[isoman2kx]

Originally posted by chilled

block parts on your black wall are "normal", im not expert in resolving this but it can be made with GK (or by just increasing output size or resolution or many many other settings in AGK).

thanks for the help

although like what sorta settings in AUTO GK would make a difference?

for resolution for ex, would I use (under settings) AUTO width or maybe a minimum width of a certain number?

out_width = 720, which was what the movie CADDYSHACK that I just encoded, was set to when I chose an output resolution of auto width?

would some of the pixalation/small blocks be lessened if I set it to a lower width?


here's a log if this helps any.

















[3/29/2005 10:53:40 PM] AutoGK 2.01b
[3/29/2005 10:53:40 PM] OS: Win98 (4.10.67766446).1
[3/29/2005 10:53:40 PM] Job started.
[3/29/2005 10:53:40 PM] Input dir: C:\CADDYSHACK\VIDEO_TS
[3/29/2005 10:53:40 PM] Output file: C:\CADDYSHACK\VIDEO_TS\caddyshackdivx.avi
[3/29/2005 10:53:40 PM] Output codec: DivX
[3/29/2005 10:53:40 PM] Audio: English
[3/29/2005 10:53:40 PM] Subtitles: none
[3/29/2005 10:53:40 PM] Format: .DIVX
[3/29/2005 10:53:40 PM] Target quality: 93%
[3/29/2005 10:53:40 PM] Started encoding.
[3/29/2005 10:53:40 PM] Demuxing and indexing.
[3/29/2005 10:55:45 PM] Processing file: C:\CADDYSHACK\VIDEO_TS\VTS_01_1.VOB
[3/29/2005 10:55:45 PM] Processing file: C:\CADDYSHACK\VIDEO_TS\VTS_01_2.VOB
[3/29/2005 10:55:45 PM] Processing file: C:\CADDYSHACK\VIDEO_TS\VTS_01_3.VOB
[3/29/2005 10:55:45 PM] Processing file: C:\CADDYSHACK\VIDEO_TS\VTS_01_4.VOB
[3/29/2005 10:55:45 PM] Processing file: C:\CADDYSHACK\VIDEO_TS\VTS_01_5.VOB
[3/29/2005 10:55:45 PM] Source aspect ratio: 16:9
[3/29/2005 10:55:45 PM] Source resolution: 720x480
[3/29/2005 10:55:45 PM] Found NTSC source.
[3/29/2005 10:55:45 PM] Source seems to be pure FILM.
[3/29/2005 10:55:45 PM] Color correction enabled.
[3/29/2005 10:55:45 PM] Output will contain 141171 frames
[3/29/2005 10:55:45 PM] Forcing encoding with sharp matrix.
[3/29/2005 10:55:45 PM] Using bitrate spikes control.
[3/29/2005 10:55:45 PM] Running single pass encoding.
[3/29/2005 10:55:45 PM] Writing the following script to C:\CADDYSHACK\VIDEO_TS\agk_tmp\caddyshackdivx_movie.avs
===========================================================
LoadPlugin("C:\PROGRA~1\AutoGK\DGMPGDec\DGDecode.dll")
LoadPlugin("C:\PROGRA~1\AutoGK\filters\autocrop.dll")
LoadPlugin("C:\PROGRA~1\AutoGK\filters\ColorMatrix.dll")
LoadPlugin("C:\PROGRA~1\AutoGK\filters\RemoveGrain.dll")

movie = mpeg2source("C:\CADDYSHACK\VIDEO_TS\agk_tmp\caddyshackdivx.d2v")
cropclip = autocrop(movie,mode=0,wmultof=4,hmultof=4,samples=10,aspect=0,threshold=34,samplestartframe=0,leftadd=0,rightadd=0,topadd=0,bottomadd=0)
fixed_aspect = 1.18518518518519
c_width = width(cropclip)
c_height = round(height(cropclip) / fixed_aspect)
input_par = float(c_width)/float(c_height)
input_par = input_par > 1.4 ? input_par : (4.0/3.0)
out_width = 720
out_height = round(float(out_width) / input_par)
hmod = out_height - (floor(out_height / 16 ) * 16)
out_height = (hmod > 4) ? (out_height + (16 - hmod)) : (out_height - hmod)
new_aspect = (float(out_width) / float(out_height)) / fixed_aspect
autocrop(movie,mode=0,wmultof=4,hmultof=4,samples=10,aspect=new_aspect,threshold=34,samplestartframe=0,leftadd=0,rightadd=0,topadd=0,bottomadd=0)
LanczosResize(out_width,out_height)
RemoveGrain(mode=2)
ColorMatrix("Rec.709->Rec.601",mmx=false,hints=false)
===========================================================
[3/30/2005 1:13:56 AM] Duration was: 2 hours 18 minutes 10 seconds
[3/30/2005 1:13:56 AM] Speed was: 17.03 fps.
[3/30/2005 1:13:56 AM] Muxing into DIVX format.
[3/30/2005 1:19:33 AM] Job finished. Total time: 2 hours 25 minutes 52 seconds

[chilled]

guess you are getting BIG outputs now
I would try switching to XviD, disabling the "force sharpmatrix" hidden option, set the resolution to auto and low the quality to 75%. If this just doesnt do it right, switch to 2pass encoding. I almost never no quality aimed encodes so I dont know anything more