Maximum quality

[mxclouti]

The final size of the avi file does not matter for me. I want the maximum quality that is possible to acheive.

So, how do I get the maximum quality? Should I put a big number in Average Bitrate or in Total File Size? VBR for sure.

Other questions:

Why in v0.27, SmartRipper has been replaced by DVDDecrypter?

In DVD2AVI, what is the purpose of "Dolby Digital Downmix"? 5.1 channels to 2 channels?

Should I keep 48khz in my mp3 or use 44.1khz?

Do I lose quality when I use bi-directional encoding? What is it exactly?

Do I lose quality when I use global motion compensation? What is it exactly?

Thanks.

[manono]

Hi and welcome to the forums-

I can take some of those, but there's a chance I may be wrong on one or two, so someone correct me if necessary.

So, how do I get the maximum quality?

Don't encode through GKnot as it's for 2 pass encoding for a given file size. You said you don't care about file size. So do it directly in VDub and set it for 1 Pass Quality Based with Quant=2=100%.

Why in v0.27, SmartRipper has been replaced by DVDDecrypter?

DVDDecrypter is better (can rip more movies successfully) and faster. But if you're happy with SR, then it's OK to use.

Should I keep 48khz in my mp3...

Yes.

In DVD2AVI, what is the purpose of "Dolby Digital Downmix"?

It converts the audio to WAV. Get the AC3 track you want and let GKnot-BeSweet do the MP3 conversion (unless you want to use the AC3 track).

Do I lose quality when I use bi-directional encoding?

Yes, although it may or may not be noticeable to you. A description can be found at DivX.com (http://www.divx.com/support/divx/guide.php).

Do I lose quality when I use global motion compensation? What is it exactly?

It's generally recommended around here that you not use it as it's thought to be buggy and may leave artifacts. A description can be found using the link above.

[mxclouti]

>> It converts the audio to WAV. Get the AC3 track you want and let GKnot-BeSweet do the MP3 conversion (unless you want to use the AC3 track).

I think you're wrong here. You must be talking about "Demux" or "Demux All".

[manono]

Hi-

Could be. That was one of the ones that I wasn't positive about as I don't use it. However, Dolby Digital->Demux gives you AC3 (if that's what's on the DVD), because that's what I do sometimes. But it looks as if you were right with your first guess. Although you said Dolby Digital Downmix, you meant Dolby Surround Downmix, didn't you? This is from the DVD2AVI.txt included with GKnot:The difference between Conventional Stereo and [Dolby Surround Downmix].

Conventional Stereo (5.1->2ch)

Lo = L + c' * C + s' * Ls (+ lfe' * LFE)
Ro = R + c' * C + s' * Rs (+ lfe' * LFE)

Dolby Surround Downmix (5.1->2ch)

Ls + Rs -> 7KHz low-pass filter (in order to obey the DS spec) -> S

Lt = L + c" * C - s" * S (+ lfe" * LFE)
Rt = R + c" * C + s" * S (+ lfe" * LFE)

Lt, Rt -> Pro-Logic rematrixing (inverse computation) -> L, R, C, S (2->4ch).

[ReTroAcTive]

Originally posted by mxclouti
In DVD2AVI, what is the purpose of "Dolby Digital Downmix"? 5.1 channels to 2 channels?

Do I lose quality when I use global motion compensation? What is it exactly?ly?

Thanks.

dolby downmix mixes the 5.1 channel sound down to 2 channel stereo. demux gives you ac3, decode gives you a wav and takes a hella long time.

ive used glm in some encodes and as long as i keep the quality up i dont see anything wrong with it. though i dont use it anymore. lol

[cpuuk]

I did a quick test of rippers,SR2.41 and DVDDecrypter, and they ripped at exactly the speed (to the second). I tested with win_io access method. Maybe I'll try ASPI access method next time ;)

Oo, just noticed the region patch facility in DVDDecrypter, I will check out an R1 disc on an R2 drive............ tickle me pink, it worked! Nice one LighteningUK :D

[N_F]

The copy speed isn't any different as far as I've noticed. But the speed to find the correct key could take some time in Smartripper while in DVDDecrypter it isn't even noticeble.