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View Full Version : Any info on "iVCD by Fl0ppy" custom matrix for XviD?

orion44
10th December 2023, 18:48
Does anyone know anything about this quantization matrix?

Does 'i' stand for interlaced maybe? Can it be used for progressive videos?
Emulgator
10th December 2023, 19:33
VCD Video can be:
¼ D1 NTSC (SIF) 352x240x29,97p 4:3
¼ D1 NTSC (SIF) 352x240x23,976p 4:3
¼ D1 PAL (SIF) 352x288x25p 4:3
so no interlaced. May be this is related to a software named iVCD.
https://macdownload.informer.com/ivcd
Selur
27th December 2023, 09:07
iirc XviD had no interlaced encoding mode and custom quantization has nothing to do with interlaced or progressive,....
ReinerSchweinlin
13th May 2025, 13:31
VCD used MPEG1 Video , xvid is MPEG4 (DVD MPEG2)...

the mentioned matrix seems to be an MPEG2 Matrix, I found some mentionig in another thread.

https://forum.doom9.net/showthread.php?p=658111

why are you asking, what do you want to do ? Encode a VCD? SVCD? DVD ?
orion44
14th May 2025, 17:07
VCD used MPEG1 Video , xvid is MPEG4 (DVD MPEG2)...

the mentioned matrix seems to be an MPEG2 Matrix, I found some mentionig in another thread.

https://forum.doom9.net/showthread.php?p=658111

why are you asking, what do you want to do ? Encode a VCD? SVCD? DVD ?

At the time, I was testing various custom matrices when encoding DVDs, and this one produced quite a pleasing look (subjectively), so I was just curious.
ReinerSchweinlin
15th May 2025, 09:45
At the time, I was testing various custom matrices when encoding DVDs, and this one produced quite a pleasing look (subjectively), so I was just curious.
As far as I can gather info. -its an MPEG2 Matrix, so "not for xvid"...
orion44
15th May 2025, 10:55
As far as I can gather info. -its an MPEG2 Matrix, so "not for xvid"...

Ok, I did not know that. I had a folder with a huge number of custom matrices, and I thought they were all suitable to be used with XviD.

Nowadays, I just use the default H.263 matrix in combination with various AviSynth filters.
SeeMoreDigital
15th May 2025, 14:34
I'm confused...

Do you want to encode an MPEG-2 video stream compatible with the DVD standard or do you want to encode an MPEG-4 ASP (XviD) video stream from a DVD source?
orion44
16th May 2025, 08:12
I'm confused...

Do you want to encode an MPEG-2 video stream compatible with the DVD standard or do you want to encode an MPEG-4 ASP (XviD) video stream from a DVD source?

I was/am encoding an MPEG-4 ASP (XviD) video stream from a DVD source. A DVD rip made with XviD codec.