Is it normal for the addborders step to reduce quality?

[video_magic]

Hello, I have an XViD avi and just doing addborders reduces quality - is that unavoidable?

I am using the official Avisynth as dated 28th October 2005 on Sourceforge.

I play my normal XViD encoded movie in Media Player Classic and it looks quite nice.

I want to fill out the frame size to 720x576 by ading black borders and so I open my video in Media Player Classic Via just the following AVS script, and then the whole picture looks noticeably worse with sort of slight blocking over much of it:

Avisource("D:\atmp\movie\movie1.avi", false, fourcc="XVID")
addborders(32, 144, 48, 160)

There is nothing else in the script, nothin else changes on the system, so is this addborders step unavoidably going to reduce quality? :( (if so I am in a rut 'cause I need to flesh out to 720x576 but not lose quality....)

Thanks for any information

[video_magic]

I have tested it further and it definitely is the addborders line - I didn't think of this obvious test before.

I play the avs script with just the avisource line and it looks exactly the same as the original movie when it's not played through an avs.

I add the 'addborders' line, and then it looks athough there is a distinct muddiness over the picture when I play it - but strangely enough not over the added borders...

Anyway, I wondered if anyone knows an alternative way of adding borders because I'm stumped and I'm not very advanced. I do think the avisynth notes for addborders could be amended to mention that the picture will degrade - i.e. that it doesn't just add a border around the picture - because I didn't realise it would do that

[sh0dan]

The video isn't altered in any way by addborders. You must be experiencing an issue with your hardware/drivers or MPC.

[video_magic]

Damn, that was a good call - although I don't know why it is, it is Media Player Classic.

I tried my avs script in Mplayergui and it works fine.

But why does MPC play fine without addborders, and ruin the picture with addborders (no other differences at all just addborders). That had me foxed all night.

Thanks for your help Sh0dan, I had almost given up on being able to do this.

[Zarxrax]

If you have postprocessing enabled in your directshow filter, then that is cleaning the file up if you just watch it directly in MPC. If you load it through Avisynth with avisource though, you dont get any postprocessing. If you use DirectShowSource instead, you will probably get a more similar result.

[video_magic]

I have no post-processing on.

The video plays fine in MPC with avisource.

The video has muddiness/blockiness over the picture in MPC with avisource and addborders......

mplayergui plays it fine with avisource & addborders.

But anyway, so long as my encoder doesn't have a problem from the avs then it is just some quirk that I don't understand with MPC I suppose - naturally I had thought it was the addborders line.

[Chainmax]

For future references, try to phrase your requests better, this sounded like a rule6 violation.