little bit of pixels after encode

[StoneColdWhat]

I have a compressed file from a good source at 250mb for 45 mins or so, when I play the original video there are no pixels, ok its rmvb but the source is dvd, anyways the original has no pixels problem, I tried to load the original in gspot so I can see what the resolution was but gspot doesn't pick it up, I tried the newest gspot, I'm converting in tmpgenc at 2000kpbs at the highest quality at 352*480 I thought that maybe if I were to convert it at 720x480 it would look good but it looked even more pixelated! at the 352 the pixels were small, but they got bigget at 720, ideas ?

[Baldrick]

Try identify with latest mediainfo.

And 250 MB for 45 mins must be very low resolutions if it looks good....

[StoneColdWhat]

250mb for 45 on RMVB is pretty good for RMVB most people convert it to around 100. Anyways in media info its:

766kbps 512*384 (4/3) 25fps

so with that now found, how come I'm getting the pixels when I'm going to a lower resolution ? Would it have anything to do with the fact I'm converting to 30fps ?

[thecoalman]

High quality bitrate for MPEG2 @ 352x480 starts at around 4000kbps. Do some tests and work your way down.

Scaling video up generally produces poor results no matter what you do....

[guns1inger]

Converting to 30 fps will just make your video jerky. Better option would have been to encode at 25 fps and use DGPulldown to lift the framerate.

Post a screenshot of this problem, if you can.

[jagabo]

Are you doing a 2-pass variable bitrate encode or a single pass constant bitrate encode? You should be doing the former. 2-pass VBR at the Normal quality setting will give better results and will run faster than single pass CBR at the Highest quality setting.

If you don't need files of a particular size try using the Constant Quality setting with the quality set at about 85, Max Bitrate at 8000, and Min Bitrate at 1000.

Some general rules:

The larger the frame size the higher the bitrate you will need.

The higher the frame rate the higher the bitrate you will need. Although in this particular case (25 to 30 fps with TMPGEnc) it won't matter much.

Converting from 25 to 30 fps in TMPGEnc will give a jerky result. Encoding at 25 fps and using DGPulldown to add 3:2:3:2:2 pulldown flags will play more smoothly.

[StoneColdWhat]

guns1inger: Actually I've been encoding it at 30fps for a long time and I have never noticed any lag, even during action scenes.

jagabo: this is what my settings are atm.



I'm going to try and post a sample of the original, and my 2 encodes at 720 and 420x352 tomorrow.

I have to set it at 2300kpbs because I want to fit 5 files on the dvd, I've always thought that there was no point to set the bitrate to that high when the original is only 700 ?

[guns1inger]

quality is in the eye of the beholder. The bitrate of Divx/Xvid source has little or no bearing on the required bitrate for DVD conversion. For full-D1 I would find the image quality at 2300 way too poor, while others may well find it acceptable. I don't see the point of going through the process of conversion if I going to create something of poor quality. With Divx capable players becoming very cheap in most countries, there is no reason to create poor quality DVDs when you can fit 12 45 minute episodes on a single DVD.

[manono]

And as jagabo speculated, you're using CBR encoding. And then you wonder why it looks like crap as soon as there's any movement or action?

[StoneColdWhat]

It doesn't look like crap when theres movement / action I dont notice it unless I'm up close to the tv.

Divx player isn't going to help me much, my sources are not in divx to begin with. I'll try the VBR method and see how that goes. Will post some clips of my current method later.

[jagabo]

It doesn't look like crap when theres movement / action I dont notice it unless I'm up close to the tv.

If you're happy with the results why are you here for advice?

[StoneColdWhat]

Caz hes saying it looks like shit and I'm saying it doesn't, I want it to be better then it already is.

[mats.hogberg]

I notice you've set motion search precision to Highest. That's only a waste of time, as it is really very slow (as it also says) while giving abolutely no visible advantage over the next best, or even third best option, which is much faster.

/Mats

[jagabo]

I want it to be better then it already is.

The solution to your macroblocking problem has been given several times already. Switch to 2-pass VBR encoding.

[45tripp]

I notice you've set motion search precision to Highest. That's only a waste of time, as it is really very slow (as it also says) while giving abolutely no visible advantage over the next best, or even third best option, which is much faster.

/Mats

I'll second that

[StoneColdWhat]

I loaded a new file into media info, checked the info and for this one I've got 1000kbps 608x336, I'm going to test this with the 2-pass VBR should I set the resolution to 720x480 or 352x480 ? Also I noticed that I can't change the bitrate to less then 3000 (wizard) is it mandatory for the 2P-VBR ?

[mats.hogberg]

If you're going for 3000 kbps, use 1/2 D1 (352x480). Even at that res, I'd use a higher bitrate. A good rule of thumb is "Use 4x AVI bitrate when reencoding to MPG to preserve video quality"

/Mats

[StoneColdWhat]

Well I'm not going for 3000 kbps in specific, I'm just wondering if I can go lower then that or not with cbr, I'd like to stick 135mins of data on the dvd.

[mats.hogberg]

135 min with 224 kbps audio leaves 4288 kbps for video. I'd settle for 4200 ave, 2000 min 8000 max 2 pass VBR if quality was my top priority. D1 or 1/2 D1 would depend on what's in the video. "Talking heads": Full D1. High action: 1/2 D1

/Mats

[jagabo]

Well I'm not going for 3000 kbps in specific, I'm just wondering if I can go lower then that or not with cbr, I'd like to stick 135mins of data on the dvd.

CBR is the root of your problem.

[StoneColdWhat]

ack sorry guys I wasn't thinking right when I posted the last msg.

Well I'm not going for 3000 kbps in specific, I'm just wondering if I can go lower then that or not with cbr, I'd like to stick 135mins of data on the dvd.

CBR is the root of your problem.

I meant VBR.

Instead of 135 mins, I meant 220 give or take a few mins. Would it be possible with the 2-P VBR ? Like I was saying when I was testing it last night I loaded the file and It wouldn't let me go lower then 3000kbps.

[jagabo]

220 minutes at half D1 should look passable with a 2-pass encode, depending on the video.