Doubt about compression rate with Autogk

[xultz]

Hello guys!

Sorry for my poor english.
I bought some weeks ago a USB capable DVD player (DVP3060). I´m making backup of my DVDs with Autogk and it works great. I use DVD Decrypter to copy it to HD (using IFO mode), run SubRip to create a .srt file, and use Autogk to make a avi. After that, I use sub2divx to create a .divx file, and everything works great.
I set on autogk to make the file with 100% of quality, because I prefer a higher quality video instead of a smaller file size.

I bought some months ago a box with all the seasons of the "Monty Python Flying Circus" show (I love it), and decided to make a backup of them. But with them some strage things happened. First of all, all the movies I converted with Autogk had the .avi file with about 1/3 of the size of the original .vob. I think it is because of the compression algorithm of divx, which is superior and makes a smaller file with the same quality. But with the Monty Python file, the .avi is about twice the size of the .vob, very strange. What I noticed is that the image of the video (the original one) has a "noise" on the background because of the age of the original tape. I can only imagine that is because of that noise that the .avi file is so big.
And when I play the file on my DVD, it is slow, with about 2 or 3 fps, it looks like it is a heavy file for the player to process. I tried with a smaller quality rate (70%) and the file was about the same file size of the .vob, and the player was a little lighter to process, the fps was much better, but wans´t the same of the original on the DVD.

So, I would like to know what am I doing wrong, how can I make a .divx file with the same quality and light enough for the player to play the series.

Thanx in advance for any answer!

[BigDid]

...I´m making backup of my DVDs with Autogk and it works great. I use DVD Decrypter to copy it to HD (using IFO mode), run SubRip to create a .srt file, and use Autogk to make a avi. After that, I use sub2divx to create a .divx file, and everything works great.
Hi and welcome to the forum,

From above I read you encode to divx and not to xvid. Due to your particular problem, you should try xvid.

I set on autogk to make the file with 100% of quality, because I prefer a higher quality video instead of a smaller file size.
With xvid, going above 80% will give you little to very little gain.

...But with the Monty Python file, the .avi is about twice the size of the .vob, very strange. What I noticed is that the image of the video (the original one) has a "noise" on the background because of the age of the original tape. I can only imagine that is because of that noise that the .avi file is so big.
How big? more than 2Go or more than 4Go ?
Yes heavy noise can drastically increase final size.

And when I play the file on my DVD, it is slow, with about 2 or 3 fps, it looks like it is a heavy file for the player to process. I tried with a smaller quality rate (70%) and the file was about the same file size of the .vob, and the player was a little lighter to process, the fps was much better, but wans´t the same of the original on the DVD.
Again if you are using divx, try xvid and let us know if different..

So, I would like to know what am I doing wrong, how can I make a .divx file with the same quality and light enough for the player to play the series.
Same as above.
Heavy noise/grain has been covered here with various approach and solutions.
Removing grain is always a trade off between quality (read sharpness) and size; Autogk with it's internal filter: removegrain(mode=2) is good for mild grain and keeps good sharpness.

So first try xvid with 70 to 80% or encode with 2 pass with size you want and see if OK!
If not, you will have to try either:
- filtering besides autogk with AGKPal or
- another Xvid/Divx encoder capable of advanced filtering like HdconvertoX, Megui, StaxRip or any other GUI that can suits your needs; see:
http://forum.doom9.org/forumdisplay.php?f=52 or
http://forum.doom9.org/forumdisplay.php?f=78

Did

Edit: if you want us to be more technical:
:logfile: :thanks:

[Skelsgard]

SAPs have max bitrate limits, I know that some LGs for example top at 4000 kbps. I've never made a rip with that much bitrate so I don't know how much it does affect playback speed.
Also, if you're going XviD, remember that some rules apply:
- No GMC: almost no player supports GMC on Xvid, while most of them do on DivX. So set GMC to off if using XviD.
- B frames: don't use more than 1. If the speed hit is still noticeable try with no B frames at all.
- No packed: again, some players don't support packed bitstreams.
- Closed GOP: some don't support closed GOPs either.
GMC is the one that it's most likely to give you problems while your player might cope with the other 3.

Later