Buenos dias 
Soy nuevo por aqui,gracias a vuestros comentarios he resuelto el problema que tenia con el visionado de MKVs,ahora van muy bien…pero no perfectos,aun aprecio algun “trompicon” :mellow:
Despues de hacer varias pruebas,poniendo mi Samsung PS6900 50" 3D sin ningun tipo de ajuste automatico y poniendo el refresco a 24 hercios no conseguia que el audio fuera sincronizado,en cambio a 50 hercios la cosa parece ir bien…a que puede ser debido?hoy terminare de hacer pruebas,tengo instalado el Plex en un Mac Mini G3 i5 con 2gb de ram que acabo de adquirir.
Por cierto,un foro estupendo,si me haceis un hueco,me quedo :lol:
Salu2!
Bueno, pues después de unos cuantos meses y numerosas pruebas tanto con Plex como con XBMC, creo que he logrado solucionar mi problema de stuttering/judder!!!
Para ello he seguido todos los pasos de este tutorial:
Foro XBMC
This guide will make XBMC play all HD 1080p scene files smooth.
This guide can be used in combination with other plasma and/or LCD TV’s. However some settings in the TV part will be named differently. The main TV part is the “image enhancement” settings on your TV.
Goal:
The goal of this guide is to get XBMC to play all scene HD mkv files smooth. The guide will explain smooth and scene files.
Q1: what is smooth playback?
A1: I am very sensitive to non-smooth motion in film. I notice a 1 frame drop. Which is very annoying since I must have absolute smooth playback.
Now, smoothplayback can mean a lot of things. For me smooth playback means that:
1: no frames are dropped (due to slow CPU, GPU or network issues. Dropped means frames are not displayed at all)
2: no unnatural motion in pans and/or tilts. (a smooth pan/tilt with no jurks)
3: as I am very sensitive to smooth motion I dont like 24p movies played at 24Hz. I experience these movies as jurky. In cinema’s I dont have this, probably because of the bigger screen and the whole environment. This however is VERY personal.
Q2: What are Scene MKV files.
A1: Downloaded HD 1080p files come in all sorts and sizes. This guide will only handle files with these conditions:
1: Use the h264/x264/AVC codec
2: Use DTS or AC3 audio
3: Have maximum codec profile of High@L4.1
4: Play these files from the local HD and do not play them using SMB while testing!
Explanation:
1: only h264/x264/AVC files are able to be decoded with VDA the hardware decoder supplied with the mac mini. To my knowledge, VC1 and MPEG are not supported in hardware decoding with VDA.
2: I don’t own a DTS-HD or MA receiver
3: When using VDA on the Mac (Mini) only files that fall in the official H264 specs will play correct.
The peak/max bitrate one of those conditions.http://en.wikipedia…iki/H264#Levels. Use Mediainfo Mac to see the profile of the filehttp://mediainfo.massanti.com/ This means no extreme bitrates or too many reference frames. Please note that the average bitrate is not important. The peaks are. If in a scene the peak bitrate jumps to above 30-40Mbit there could be trouble and frames could be dropped. So when reading scene NFO-files, the average number does not say much. The KillaSample is an example of such a file. It is out of specs and will not play smooth in most hardware decoders and therefore is useless.
Quote:For example, for an HDTV picture that is 1920 samples wide (PicWidthInMbs = 120) and 1080 samples high (FrameHeightInMbs = 68), a Level 4 decoder has a maximum DPB storage capacity of Floor(32768/(12068)) = 4 frames (or 8 fields) when encoded with minimal cropping parameter values. Thus, the value 4 is shown in parentheses in the table above in the right column of the row for Level 4 with the frame size 1920×1080.( Wikipedia )
Files outside these specs will fail to play smooth. However most current scene files are within these specs. Early HD files may not. Use Mediainfo Mac to check
Prequisites:
1: Panasonic Plasma TV model 2010
2: Mac Mini with SnowLeopard
3: XBMC Dharma RC2
1: TV setup:
When using a Panasonic TV make sure the TV settings are correct and IFC is turned OFF
In general, make sure that all “image enhancement” settings are turned OFF. If you are not using a Panasonic Plasma TV, find out what the “image enhancement” settings of your TV are and turn them off.
I own a dutch Panasonic TV so some text could be labeled differently. All settings are however in the correct order.
Other settings:
Intelligent Frame Creation = Off
Super resolution=Off
Automatic Standby=4 hours
Energysaving = Off
16:9 imagescan= Off
Timezone= Auto
DVI input settings= Complete (this sets the colorspace from 16-235 to 0-255 when using mini-DVI)
Image Settings:
THX
Contrast= 36
Lun= -3
Color= 30
Sharpness= 6
Vivid Colors = Off
Eco = Off
P-NR = Off
Panel = On
Advanced Settings (ifs)
R=+2
G=-1
B=0
R-block=+2
G-block=-2
B-block=0
Gamma=2.2
Software version
2405-100000
To check if the right resolution and settings are used, press “Info” on the Panasonic remote. The following grey box should appear on screen:
HDMI1
1080p / 60 hz input
16:9
The tv MUST be turned on BEFORE turning on the Mac Mini. If not massive frames are dropped and it appears no openGL acceleration is available due to no canvas found to render to
XBMC MUST be started while the tv is on. So starting XBMC via remote vnc will not work. Again, it appears no openGL acceleration is available due to no canvas found to render to
It is OK if the TV is in standby mode but not if 100% turned off
Quote:Ah, found the solution on Macintouch. Bit of a workaround but it works for me nevertheless!:
Quote:
A tip, if you run a similar setup: When rebooting the Mini make sure that the TV is connected and powered up. If the OS doesn’t see an external display device upon boot it disables a bunch of video hardware acceleration features (among them coalesced updates), and they will not automatically come back when you turn on the TV or connect a device - the only solution I found was to reboot. You’ll know you’re stuck in this degraded video mode because of severe tearing in video and large window dragging, and coverflow will be disabled, as if the system didn’t have the graphics horsepower to support it. Turning on the TV, booting the computer, then immediately turning it off is sufficient–so long as it sees an external display during the boot process, everything gets enabled, and you can still use it headless easy enough. If you don’t have the mini connected to a display at all (or don’t care about the video output looking awful if you do), then this doesn’t matter, of course.source
2: Mac Mini setup:
Type of Mac Mini
There are several Mac mini’s Mac Mini version
Early 2006 Does not support VDA due to Intel GMA graphics. Is not supported in this guide. Replace the Wifi with Crystal HD chip to get Full HD support
Late 2006 Does not support VDA due to Intel GMA graphics. Is not supported in this guide Replace the Wifi with Crystal HD chip to get Full HD support
Mid 2007 Does not support VDA due to Intel GMA graphics. Is not supported in this guide Replace the Wifi with Crystal HD chip to get Full HD support
Early 2009 Is supported in this guide (only with 10.6.3)
Late 2009 Is supported in this guide (only with 10.6.3)
Mid 2010 Is supported in this guide (only with 10.6.3)* See link
Operation system and version.
Snowleopard version 10.6.3 introduced by Apple the ability to use VDA outside Apple’s own software.
THE ONLY VERSION TO HAVE CORRECT VDA SUPPORT IS VERSION 10.6.3.
Update: As of March 13 2011 Dharma 10.1 in combination with 10.6.6 fixes the VDA bug.
So when running 10.6.6, XBMC 10.1 is required to play h264 with VDA enabled
http://forum.xbmc.org/showthread.php?t=77992&page=9
10.6.4 and 10.6.5 have a bug that makes the unable to play files without dropping frames.
TV connected to mac mini with Mini-DVI or Mini Displayport to HDMI 1 input on TV
3 refreshrates are available:
24, 50 and 60 Hz
Set the Mac desktop to 60hz and overscan enabled.
Also, with these settings there is a 1:1 pixel ration. That means that all pixels that the Mac Mini puts out are displayed 1:1 on the Plasma screen.
Important !
Check if the whole desktop screen is exactly on the screen. If not disable overscan, switch to 50Hz and enable overscan. Then, switch to 60 hz again and enable overscan again
This is very important. The desktop should be EXACTLY 100% of the screen.
3: XBMC Setup:
Download RC2: http://mirrors.xbmc.org/releases/osx…ma_rc2-x86.dmg
Setup inside XBMC:
SYSTEM | VIDEO | PLAYBACK
1: Render method = Auto Detect
2: Allow hardware acceleration (VDADecoder) = ON
3: Adjust display refresh rate to match video = OFF
4: Sync playback to display = OFF
The mac Mini in combination with XBMC Out of the Box does not have the ability to switch refreshrate. I know there are some software solutions to fix that but I dont use them.
SYSTEM | SYSTEM | VIDEO OUTPUT
1: Displaymode Fullscreen
2: 1920x1080
3: Vertical blank Sync= Always Enabled
Now all movies in XBMC are played at 60hz on the Plasma TV,
So:
24fps@60hz
29,970@60hz
23,976@60hz
etc. All is played on my panasonic @ 60hz and all is smooth
*
A pan in the Bluray Earth is smooth, perhaps not 24fps but for me personally it is smooth. Again a personal taste
_____________________________________________________________________________________
Salvando diferencias, he aplicado las bases de este tutorial en mi configuración actual: TV Toshiba Regza 46SV685, HDMI, Mac Mini 2010 4Gb Ram 500Gb HDD, NAS Lacie y con OS Lion 10.7.1:
. En primer lugar he desactivado todos los ajustes de procesamiento de imagen del televisores. Muy importante, cualquier procesamiento por insignificante que parezca afectará al resultado final.
. En segundo lugar he ajustado el refresco de pantalla (en el Mac Mini) a 60 HZ (NTSC).
. En tercer lugar he configurado Plex/Xbmc como se indica.
Como bien se indica finalmente, no se consigue un verdadero efecto 24p, pero os puedo asegurar que la imagen va fluida y suave, sin pérdidas de fotogramas y sin pérdida de sincronización.
Que tengáis suerte!
Recientemente he sustituido mi TV por una nueva Panasonic TX-P65VT50, y modificado ciertos componentes en mi antigua configuración, y sobretodo he empezado a disponer de películas en formato FULL BLURAY, y … He vuelto a tener problemas con la reprodución del PLEX.
Los problemas no eran ni del famoso JUDDER, ni de STUTTER, únicamente eran artefactos y píxeles como desenfocados en la reproducción de MKV con alto bitrate. Ciertamente eran aleatorios pero bastante molestos, por lo que me puse a investigar y a experimentar, llegando a la solución bien sencilla de:
. Desactivar la aceleración por hardware!!! :rolleyes:
Y todo solucionado! Ahora todo, todo, va fluido y como la seda.
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