Best AVS script for HDTV > XVID/DIVX conversion

[maxpower2078]

I posted this at avsforum.com with no response so I thought I would try it over here.

"I was wondering what was the best or one that someone has had great luck with for creating a high quality 720p or lower 480p from hdtv transport streams.

I was just wondering because I have been making conversions that looks good and everything, but the downloadable ones looks about the same at a much lower bitrate and resolution.

I have been successful using this guide so far.

http://samek.neostrada.pl/hdtv/hdtv2xvid.htm
"

Any help would be great.

[Abond]

I doubt I can provide you the best script , but maybe some thoughts about.
Well, the bitrate and resolution go hand by hand about visual quality. So higher the resolution you need higher bitrate to look the same as lower resolution with lower bitrate. You may find useful to perform some compressibility tests with GordianKnot which are dealing exactly with these parameters - bitrate and resolution.
But of course in full screen mode higher resolution with corresponding bitrate will look no doubts better than lower resolution with lower bitrate.
Another thing is some filtering in avisynth that can help with compressibility. Such an function is for example HybridFupp. With such a resolution as 480p or 720p you can use even lower presets with HF and still the picture will look good and the compressing go higher. For the HF function look at doom9.
Though this fuction will require progressive input. There are many functions and plugins (built-in and external) to deinterlace in avisynth, but with conection of compressibility I would suggest RGDeinterlace function. For this look at doom9 for RemoveGrain thread.
So hopefuly it is helpful

[Soopafresh]

Hey Maxpower !

Several things I recently learned - check out the docs included with the latest DGMpgDec. The app has a great deblocker that will reduce macro blocking so you can convert at a lower bitrate. Also, check out the AviSynth usage threads over at Doom9 for additional tips.

Here's an example for your AVS file

mpeg2source("F:\x.d2v", idct=0, cpu=4, iPP=true, moderate_v=20)


That will perform deblocking and very minor smoothing, which will allow you to encode at a lower bit rate.