[divx<>XSVCD] Trying to get same quality as source...

[Hertog_Martin]

..without wasting space

So basicly I want to know what bitrate to set to get the same quality as the source.

Ofcourse I can set it very high so i get same quality but then it gets too big.

I don't know if there is some calculator or a way to calculate it.

The divx is 640x480, 25 fps, duration 42:41, number of keyframes: 737 (i guess this is the bitrate?)

Now i want to make a xsvcd with highest resolution (does 640x480 work or do i have to set it at 720 x 576 (this site says 720 x 576 or lower does that mean any res under 720 x 576 works?)

now how can i know what the minimum bitrate is to have same quality as the divx?

[puertorican138]

..without wasting space

So basicly I want to know what bitrate to set to get the same quality as the source.

Ofcourse I can set it very high so i get same quality but then it gets too big.

I don't know if there is some calculator or a way to calculate it.

The divx is 640x480, 25 fps, duration 42:41, number of keyframes: 737 (i guess this is the bitrate?)

Now i want to make a xsvcd with highest resolution (does 640x480 work or do i have to set it at 720 x 576 (this site says 720 x 576 or lower does that mean any res under 720 x 576 works?)

now how can i know what the minimum bitrate is to have same quality as the divx?

These are the resolution's you can use and expect to play right if you player supports them:


352x240 (288)
352x480 (576)
480x480 (576)
720x480 (576)

640x480 most likely will not work and will display with the wrong picture. The minimum bitrate is how low your DVD player or encoder can go. Usually, the minimum bitrate is very effective with dark scenes and scenes with very little motion.



Hope That Helps!!! :P

[Hertog_Martin]

Yes, thnx for the resolution explenation but for the rest i think you didnt understand my question.

I want to set a bitrate wich gives me no quality loss when converting from divx to xsvcd but wich also isnt unnecesary (however you right that) high.

for example if i have bitrate 1150 then i have quality loss
but if i set bitrate at 3000 i dont have quality loss but i do have a file wich is very big.

Now what i want is is a way to calculate a bitrate that gives me no quality loss and isnt too high either.

Not only for this movie, this is just an example.. but for all things im going to encode in the future

isnt there some program that converts divx bitrate to mpeg2 bitrate?

[vhelp]

hertog-martin,

expect your divX to play fine (given what you have currently, and am
calling it quality) in your software (SW) player. But, soon as you
go an re-encode it, you'll realize that those artifacts that you
didn't see during your player's play, start showing up. Basically,
TMPG or any other MPEG-2 encoder will see those artifacts that your
divX player hides and encode them as they truely are. There's no
getting around it. Sure, you can TRY and hide/camaflage them again
with "soften" and other filtering, but that's only gonna add to your
encodes' quality issues, ie, ...more blury and/or distorted, etc.

You must understand, that those movies out there are put out by many
inexperienced (includes myself) people and as such, quality is NOT
to be expected, at least in a re-encode it, that is.
Also, the higher the KEY, the harder it is to maintain accuracy in
landing at the right frame. Even when you think you are there, when
you encode it, you'll find youself in another frame. Poo. The only
way to maintain exact frame landing, is to KEY at 1, but then, this
increased your divX (anyone's) files size as larger, and poorer
quality - lots of noticable blocks.
And, what may also add to the poor re-encode is the resizing - - esp.
if not done (resized) correctly.

Bascially, you're asking for a lot from a D/L'd divX-to-VCD/SVCD
re-encode project.

You can either live with it, or buy the movie and encode to your
specification, and be happy after all.


-vhelp
I have a sample divX if you want to see it <HERE>

[Hertog_Martin]

Yes you're right in that..

but what i mean is: if i convert ti xsvcdwith 1000 bitrate it gets uglier then it could be

if i do 3000 bitrate it gets as beautiful as it can get but its too high

what i want is a bitrate that gets it as beautiful as it can be but not be too high.

what i mean with too high is that when for example you convert a 1150kb/s vcd to a 2500kb/s xvcd you have 1350 kb/s thats USELESS and only takes space.. as the maximum quality is already reached with 1150kb/s

sorry for bad english and bad explenation, hope you people get it now.
ofcourse i can just use a bitrate so that it fits on 1 or 2 cd;s but if there is some way to calculate it then that would be great