- Is It Possible To Not Loose Quality -

[ipanther]

Hi!

I got a DivX movie that is exactly 79:15 mins long. I want to turn it into a VCD but when I encode it with VirtualDub, I can see some loss in quality (gets a bit blocky - not too much, but noticable). Can I convert a DivX To VCD without any loss of quality...

Thx IPanther...

[khp]

Re: - Is It Possible To Not Loose Quality -

Originally posted by ipanther
Can I convert a DivX To VCD without any loss of quality...

No, can't be done.

[techno]

er...YES it can be done

the problem is, when u convert to VCD, the quality is poor cause it's MPEG1...that's why there is MPEG2 now (DVD/SVCD)

to improve it a little, make sure that CQ is set to 100 in TMPGENC (assuming that u r using this to convert to VCD) and set the motion search precision to VERY high quality and brighten the video up by +10

or:

take this avi, convert to MPEG2 640*480 or 352*288.

then convert that to VCD

u will c the difference.

it works, I done it sooo many times now, it is in my "Techno's law" "book" now.

Techno

[khp]

Originally posted by techno
er...YES it can be done

NO, it can't be done. First of all, VCD is limited to 352x288, while most divx converted DVD's run at almost twice that. This in itself represents a significant quality loss.
Futhermore mpeg1(vcd) is much less efficient than mpeg4(divx). Which means that the vcd will contain much less detail.

All mpeg compression are lossy, which means that you loose quality every time you recompress.
If it was possible to convert divx to vcd without loss of quality, everyone would be doing it.

It's true that you can make svcd which looses a lot less quality, unfortunatly there is still quite a lot of standalone DVD players that don't support this.

[techno]

khp, I know that but I have done it with the res being 352*288...try it urself, I DID experiment.

Techno

[khp]

Originally posted by techno
khp, I know that

Then why do you insist on spreading lies like this ?. Your statements will only serve to confuse people, and mislead the newbies who simply doesn't know, who to trust.

[techno]

excuse me? u calling me a liar? STOP THE FLAME WAR ON ME.

I think I know what I am talking about, clearly u r just jelous.

no more posts for me in this thread now, I know what I am talking about

out

Techno

[khp]

Originally posted by techno
excuse me? u calling me a liar?

No, you did that all by yourself. You posted something that was completly untrue. I called you on it, and you admitted that you already knew that, what you were saying wasn't true. This is what is commenly defined as a lie, to knowingly say something untrue.

Originally posted by techno
I think I know what I am talking about, clearly u r just jelous.

LOL

Originally posted by techno

no more posts for me in this thread now, I know what I am talking about

Sure run away and hide, when you are not man enough to stand by your own statements. Impressive

[Enchanter]

Without getting involved in the fight, let me quote this:

"gets a bit blocky - not too much, but noticable"

I think he was asking on whether he could convert the DivX to VCD without experiencing the blocks. I'm not into VCDs so I can't answer that question.

I'm out of here.

[MrSnail]

I've converted a few DVDs to VDC and DivX files to VCD

IMO VCD quality is very poor indeed compared to DivX.

Even when I have converted to 2 CD VCD rips they look far worse than DivX.

It may look okish quality on a TV because they have a lower res than a PC screen anyway and you usually sit further away from the screen, but still I have to say the quality still doesn't look that great. Especially considering they take up loads more space than DivX.

[Nielchiano]

Also without getting in the fight...

a DVD is coded in MPEG2 at bitrates of (average) about 6Mbps (=6000kbps)
a DivX is coded in (look-a-like) MPEG4 at 600kbps to 2Mbps, depanding on the person who coded it (I usualy try to stay around 1.2Mbps which gives realy good quality)
a SVCD is also coded in MPEG2 (usualy less than DVD)
a VCD is encoded in MPEG1

Since MPEG gets better each version (unlike some software) it's obvious that a MPEG2 file of 1Mbps will be better than an MPEG1.

Since VCD is MPEG1 at 1.4Mbps, the quality will be ALWAYS less than DVD, usualy less than DivX.

These statements only count on bitrate, offcourse the resolution is also important, but since there are no standard resulutions for DivX and a lot for DVD, I cannot give a full comparison..;

Hope this helps (an kept me out of the fight),
Nielchiano

[techno]

of course what u just said is right, that's why I do it to MPEG2.....ach, u will read about it in my guide when it's done

PEACE

[CoWbOyPoEt]

I think all of us here are both trying to help people and find answers to our own questions. Maybe some people found a way to do certain things while other have found another. I found a way to put a complete movie on one cd with excellent quality, but I also got a few people saying it cannot be done. Well, Ive done it. If I receive advise from someone here, I try it, and if it works, great, if not, I try something else.. Lets just keep on trying to help others to find the correct way...

Darts-n-Whiskey, it dont get any better.....

[Echo147]

Everyone should buy TV out capable graphics cards so they can ditch that awful blurry low res VCD format

[d-clone]

Re: - Is It Possible To Not Loose Quality -

Originally posted by ipanther
Hi!
Can I convert a DivX To VCD without any loss of quality...

Thx IPanther...

No, this is impossible. You might, if lucky, have no visual quality loss (and thats in the eye of the beholder), but the quality loss is still there.
The only way to not loose quality is to save as an uncompressed avi, but i think even at that you have quality loss.