TMPGEnc: CQ_VBR and Min/Max Bitrates.

[Fluffbutt]

This is probably a silly question.. but:

I've just switched over to tmpgenc from mencoder (kvcd's) because
a) the mencoder thread's locked (I loved reading the posts, and conf files..) AND b) people here have said that for kvcd's, tmpg is better.

I'm using Kwags cqmatic 1301, with tmpgenc set at 120 - 1650 bitrate.
Cq_vbr works out on average between 20 and 26.

Ok - does tmpg/cqmatic try to get the best quality within these bitrate, and going no higher that 1650 even if quality suffers? Or is the 1650 max a 'guideline' rather than an absolute?

If I set the max to, say, 2200 (or higher) would cqmatic still get a good q value in the cdr size limits?

((I suppose what I'm asking is, is my 1650 limiting the max Q from cqmatic, and would it be better to increase it?))

[Dialhot]

Quote:

Originally Posted by Fluffbutt

Or is the 1650 max a 'guideline' rather than an absolute?

I never saw this value before. Template default is 1800 (what I already find low) and I always use 2300.

Quote:

If I set the max to, say, 2200 (or higher) would cqmatic still get a good q value in the cdr size limits?

Never have any prob with CQMatic even with my actual range : 64-2300.
Just sometimes I have to encode the audio at a bitrate lower to the one used for prediction (112 insteed of 128 for instance).

Quote:

((I suppose what I'm asking is, is my 1650 limiting the max Q from cqmatic, and would it be better to increase it?))

For sure that limits the quality
BTW, I use 1600 when I do a 2h30 movie.

[jorel]

for movies with ~90 minutes i use min 300 and max 2500, for movies with ~120 minutes i change the min to 64 and, in all situations i never use audio with less then 160.....and never i use the "average bitrate" too! surprised?
the filters do a great job for me and the results are always great!

[Fluffbutt]

Thanks heaps, guys - that's been very helpful.

A 1000 Purrs are working their way towards you!

I got the 1650 from my mencoder config - it's the highest I can go in menc. and still get 115mins onto 1 cdr. I just translated the figures into the tmpg profile. I take it from your posts that tmpg can go higher and still be on one cdr... *when I said 'guideline' I meant a guideline for tmpg - is it "no higher than this, ever!" or "no higher than this, unless you have to"?

I find I'm getting excellent sound results in 128 or 112 Kpbs. My ears can't tell the difference between 128 and 192 (maybe a music dvd needs the higher one?). Sometimes even 96 sounds good.

I try to keep in integer multiples of the original sound rate - 448 I'll do to 112, 384 down to 96. I don't know if it matters, it just seems like it might, going from 448 to 128 is /3.5, the others are all /4.

I've reset the tmpg settings to 2200 max, 120 min, and cq_vbr went up from 21.26 to 21.86 (it's probably just the movie i'm doing..).

At any rate, picture quality is rather amazing - better than mencoder (I hate to say it...)
(I found that menc. sometimes does a flickery thing on the video - I saved screendumps from MPC, and in one frame the image is perfect, in the next it has macro-macro blocks (BIG squares, sort of 8x8 blocks into one)

Anyway, thanks again, fellow kvcd'ers.

[audioslave]

@Dialhot
Sorry to go off-topic but could you please post your latest DVD->KVCD script?

[Dialhot]

Quote:

Originally Posted by audioslave

@Dialhot
Sorry to go off-topic but could you please post your latest DVD->KVCD script?

MPEG2Source("PATH\NAME.d2v",cpu=4)
GripCrop(WIDTH, HEIGHT, overscan=1, source_anamorphic=true)
GripSize(resizer="LanczosResize")
Deen()
Undot()
TemporalSoften(2,7,7,3,2)
DCTFilter(1,1,1,1,1,1,0.5,0)
GripBorders()

That's in fact the avi->kvcd V4 script adapted to DVD sources.
(with Deen replacing C3D but I do that on all my jobs since a long time).