How to use MSU Deblocker on YUY2 source ?

[iffley]

Hi,

I've tried using the MSU deblocker (v2.1) VirtualDub(Mod) filter on blocky captured analogue source in HuffYUV YUY2 format. The filter has no effect.

I am assuming the filter only has an effect if the source material is in the YV12 colorspace and I am using VDubMod.

My question is - is there a way to convert the YUY2 to YV12 prior to the MSU Deblocker and before compression ? Either by some option I've missed or a YUY2->YV12 plug-in ?

I haven't got the disk space to 'fast-recompress' the original media using a YV12 codec and re-load the file - that is a horrible solution

[reboot]

I noticed it was a farily useless filter as well.
I don't know anyone that uses YV12 on a regular basis. YUY2 is far more common, even among downloads
Waste of talent, or the guy should develop his filter for YUY2.

[junkmalle]

All VirtualDub filters work in RGB colorspace.

MSU's filter only works properly when the macroblocks are at the right size and location. Use the filter before any resizing or cropping.

[iffley]

All VirtualDub filters work in RGB colorspace.

MSU's filter only works properly when the macroblocks are at the right size and location. Use the filter before any resizing or cropping.

I thought of that - I tried moving it up the filter chain in VDubMod to first and also after de-interlace (2nd) - operating at the original capture frame size of 720x540. - no visible effect

I also tried re-sizing the capture source to DVD size (720x576) , applying the MSU Deblocker and then re-sizing back to 720x540 - no visible effect.

Conclusion - doesn't do anything with YUY2 source ?

[iffley]

just repeated the previous resize experiment with a short clip output as Helix YV12 and opened in VDubMod - no visible deblocking effect.

It must be _very_ picky about where the macroblock edges are.

Why would my capture card offset the frame to cause this misalignment, though ?

hmmm...

[junkmalle]

A YUY2 source would be converted to RGB before any filtering is applied.

MSU only works for macroblock deblocking. Macroblocks happen at 8 or 16 pixel boundaries. I'm going to guess that your YUY2 source is a capture off digital cable or digital satellite. Your capture may have resulted in an offset from the original image -- so the macroblocks no longer fall in the right locations.

Here are some sample crops from a very low bitrate 720x480 MPEG file filtred with MSU deblocking 2.1:

[iffley]

MSU only works for macroblock deblocking. Macroblocks happen at 8 or 16 pixel boundaries. I'm going to guess that your YUY2 source is a capture off digital cable or digital satellite.

yes - DVB-S at 720x540

Your capture may have resulted in an offset from the original image -- so the macroblocks no longer fall in the right locations.

that looks like what has happened - must be a capture driver bug

Here are some sample crops from a very low bitrate 720x480 MPEG file filtred with MSU deblocking 2.1:

Thanks for the effort ! It seems that the deblocking effect is very slight, even at correct alignment.

[reboot]

To my eyes, not worth the trouble.

[Soopafresh]

Sometimes I have better results with the MSU Deblocker filter if I load it twice.

[guns1inger]

I have used it successfully to rescue some very old footage of my kids that I only had on VCD, but very mixed results on other sources, which seems to validate the pickiness theory.

[SatStorm]

You can use MSU deblocking when:

You have a divx/xvid source
You have a VCD (mpeg 1) source
You have a DVB (mpeg 2) source (I use virtualdub mpeg2 for those).

I have excellent results when the source is one of those.

There is no effects when you capture the analogue way (tv tuner, dv pass thru, etc) from Satellite feeds or whatever.
Why? Because that way, those macroblock you see are part of the picture now.

MSU_deblocking compares the GOP stracture parts, combine and eliminate macroblocks that way (using smoothing, adapting, spatial and other advance technics).
You don't have a GOP stracture with analogue captures so in that case that filter is useless


@junkmalle: For that pics you provide, a combination of Static Noise Reduction ( 6 ) and Dynamic Noise reduction ( 9 ) filters, could help

[junkmalle]

SatStorm, I recorded that video (Hauppauge PVR-250, 2 Mb/s 720x480) specifically to show what the MSU filter does and doesn't do. The specific frame was just the first I saw that had bad macroblocks. I'm not looking to fix the video!

[SatStorm]

OK, I didn't understand!
(today is one of those days that my brain don't fuction well.... )