video8 (hi8) to svcd questions

[vivaatloni]

Hello,

I'm converting from video8 to svcd. Now I tested several configurations in avi2svcd. My input is a capture at 720x576 with mjpeg q=19.

My test cleared out that I have to use telecide for better quality. But with progressive frames en zigzag I'm not sure. I can't realy see difference in output. But since I don't have a standalone dvd player yet I want to know the difference and what to use better. In the guide at doom9 it says dat when its frame I put the options on and if it's field I put them of, but what do I have?

My other settings are:
cbr 2530 with cce 2.50
image. quality priority=20
bias=10
linear q.=checked
bicubic resize= (0,0.6)
anti noise off
and no filters used.

Do you have some suggestions how I can get better quality. Iwant to us CBR, cause VBR takes to long.

Thx in advance

Vivaatloni

[gerti67]

Hi vivaatloni,

if you deinterlace interlaced material, you convert it to progressive material and so it should be handled as such. So you should check those options as progressive material is frame based.

Hope this helps,
Gerti

[vivaatloni]

But are there any other opties that I have to change to get a better result.

[gerti67]

Hi vivaatloni,

interlaced stuff is the worst problem for MPEG encoders around, it needs decent bitrate to give you some quality. If your player supports it create a XSVCD with bitrates up to 4000 kbit/s - that will give you some real improvement.

Further:
- Do some cropping of your source AVI so you do not encode and waste some bitrate on the TV overscan area - see Q64 of the Q&A for that.
- Use lower audio bitrates so there's more for the video left.
- Use BilinearResize, as it is usually more compressible and softens the image a little bit making artefacts less outstanding.

And you have two choices:

1) deinterlace your interlaced material and handle it as progressive material but loose some quality as de-interlacing can't be done perfectly - but most people prefer the quality loss of deinterlaced material compared to the quality loss of keeping it interlaced at lower (SVCD) bitrates

2) keep it interlaced, but that will need a hell of a bitrate to give you some quality, you might try the "Resize to CVD" option in "Frameserver" tab perhaps instead of the SVCD resolution of 480x480/576.

But that's nearly all that could be done, you have to do some testing to decide what you prefer.

Hope this helps,
Gerti

[vivaatloni]

Thx for the answer Gerti. I already do a telecide deinterlace and crop the waste off the original.
I use avi2svcd for the conversion. This is the script I am using:

LoadPlugin("C:\PROGRA~1\DVD2SVCD\MPEG2Dec\mpeg2dec.dll")
LoadPlugin("C:\PROGRA~1\DVD2SVCD\INVERS~1\DONALD~1\decomb.dll")
AVISource("D:\DVCAPT~1\CAPTURE.AVI")
ConvertToYUY2()
Telecide()
Crop(14,0,694,566)
BicubicResize(480,576,0.00,0.60)
ResampleAudio(44100)

Are these setting you would use. And also a question about the converttoYUY2 line. Why does het do this?

So you would use bilinearresize instead of bicubicresize?