Upscaling problems?

gfairbanks · 2007-10-11, 01:00

Others have posted that everything is working great for them. When I play low resolution (624x352) videos, they are upsampled to HD (1280x720) but look jagged. XBMC linux did this correctly a few weeks ago, so this problem is new to me.

Are others seeing this too, or do I need to nuke my user profile and try again?

Thanks,

-George

**Gamester17** · 2007-10-11, 14:13

Jagged as in interlaced (if so then enable the deinterlace filter from the OSD)?,
or do you mean page tearing (in which case it could be your video drivers or a bug)?

what is interlacing?
http://www.100fps.com
http://en.wikipedia.org/wiki/Interlace
http://en.wikipedia.org/wiki/Deinterlacing
http://en.wikipedia.org/wiki/Progressive_scan

What is page tearing?
http://en.wikipedia.org/wiki/Tearing

gfairbanks · 2007-10-11, 17:44

Hi Gamester17,

You're not supposed to be providing support ;-) But thank you.

Here are two hand-held snapshots of my screen. Both are of last week's Saturday Night Live comedy show. This one is from XBMC Linux:

http://groupedia.com/tmp/dsc_3057.jpg

This one is from the good old Xbox XBMC:

http://groupedia.com/tmp/dsc_3058.jpg

This show was originally broadcast in 1080i (I think), captured in MythTV, and transcoded it with Xvid to 624x352 progressive. I have seen occasional tearing of the video, but that's not what you see in these two pictures. I believe it's an upsampling problem, where a low res image is rendered on a higher resolution screen (720p in my case).

I'm not complaining or asking for a bug fix -- I just read other people's posts that everything is working great and wondered if they too were seeing this.

-George

**Gamester17** · 2007-10-11, 19:31

Which player are you using on the Xbox (MPlayer or DVDPlayer?, check the info screen)?

...and post a debug log (upload to pastebin, see the online wiki manual) from XBMC Linux

**d4rk** · 2007-10-11, 19:50

If possible, can you provide the following information:

1. glxinfo output
2. output of the command 'ffmpeg -i <videofile>' on the file you are testing.
3. general computer specs.

Also, make sure that in playback settings, that video scaling is set to 'Bilinear' and not 'Nearest Neighbor'

gfairbanks · 2007-10-12, 04:17

Thanks for the suggestions. In order to give you good feedback, I checked out the source in a new directory and built everything from scratch, including a fresh UserData directory. That fixed the rendering problem. I don't know what was in the old one, but I'm glad this is working better.

Regards,

-George

2007-10-11, 01:00	#1
gfairbanks Member Join Date: Jun 2007 Posts: 47	Upscaling problems? Others have posted that everything is working great for them. When I play low resolution (624x352) videos, they are upsampled to HD (1280x720) but look jagged. XBMC linux did this correctly a few weeks ago, so this problem is new to me. Are others seeing this too, or do I need to nuke my user profile and try again? Thanks, -George

2007-10-11, 14:13	#2
Gamester17 Team-XBMC Project Manager Join Date: Sep 2003 Location: Sweden Posts: 10,582	Jagged as in interlaced (if so then enable the deinterlace filter from the OSD)?, or do you mean page tearing (in which case it could be your video drivers or a bug)? what is interlacing? http://www.100fps.com http://en.wikipedia.org/wiki/Interlace http://en.wikipedia.org/wiki/Deinterlacing http://en.wikipedia.org/wiki/Progressive_scan What is page tearing? http://en.wikipedia.org/wiki/Tearing __________________ Always read the XBMC online-manual, FAQ and search the forum before posting. Do not e-mail XBMC-Team members directly asking for support. Read/follow the forum rules. For troubleshooting and bug reporting please make sure you read this first.

2007-10-11, 19:31	#4
Gamester17 Team-XBMC Project Manager Join Date: Sep 2003 Location: Sweden Posts: 10,582	Which player are you using on the Xbox (MPlayer or DVDPlayer?, check the info screen)? ...and post a debug log (upload to pastebin, see the online wiki manual) from XBMC Linux __________________ Always read the XBMC online-manual, FAQ and search the forum before posting. Do not e-mail XBMC-Team members directly asking for support. Read/follow the forum rules. For troubleshooting and bug reporting please make sure you read this first.

2007-10-11, 19:50	#5
d4rk Team-XBMC Developer Join Date: May 2007 Location: Albuquerque Posts: 500	If possible, can you provide the following information: 1. glxinfo output 2. output of the command 'ffmpeg -i <videofile>' on the file you are testing. 3. general computer specs. Also, make sure that in playback settings, that video scaling is set to 'Bilinear' and not 'Nearest Neighbor' __________________ Always read the XBMC online-manual, FAQ and search the forum before posting. Please read and follow the forum rules. For troubleshooting and bug reporting, please make sure you read this first.

2007-10-12, 04:17	#6
gfairbanks Member Join Date: Jun 2007 Posts: 47	Good news Thanks for the suggestions. In order to give you good feedback, I checked out the source in a new directory and built everything from scratch, including a fresh UserData directory. That fixed the rendering problem. I don't know what was in the old one, but I'm glad this is working better. Regards, -George __________________ XBMC machine: ABIT AN-M2HD with nVidia 7050 onboard (Ubuntu Hardy + latest nVidia driver), AMD Athlon BE-2350, Microsoft MCE IR Remote, Logitech PS3 USB keyboard, 33w idle, 53w max, 720p plasma over HDMI

2007-10-11, 17:44	#3
gfairbanks Member Join Date: Jun 2007 Posts: 47	Hi Gamester17, You're not supposed to be providing support ;-) But thank you. Here are two hand-held snapshots of my screen. Both are of last week's Saturday Night Live comedy show. This one is from XBMC Linux: http://groupedia.com/tmp/dsc_3057.jpg This one is from the good old Xbox XBMC: http://groupedia.com/tmp/dsc_3058.jpg This show was originally broadcast in 1080i (I think), captured in MythTV, and transcoded it with Xvid to 624x352 progressive. I have seen occasional tearing of the video, but that's not what you see in these two pictures. I believe it's an upsampling problem, where a low res image is rendered on a higher resolution screen (720p in my case). I'm not complaining or asking for a bug fix -- I just read other people's posts that everything is working great and wondered if they too were seeing this. -George

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