Reencode can affect quality?

[vigi_lante]

If I want to reencode my MPEG into compliant VCD-format using TMPGEnc...I will loss video quality?

Will be better if I convert it into Uncompressed RGB (.avi)and encode it into compliant VCD-format or will be the same?

About TMPGEnc:

In SETTINGS -> ADVANCED

The Source Aspect Ratio will change for the right choice whenever I load a video...or I need to change it manually?

Because I don't know when I video is in 1:1 VGA or 4:3 525 line(NTSC).

Sorry about my poor english.
Thanks.

[Anonymous65]

If possible, capturing to uncompressed AVI will give better quality. But if you don't have enough space to do this, then capture to high bitrate mpeg or Mjpeg will be the second best.
As for aspect ratio, if you capture in square pixels formats, like 320x240, 640x480 and so on, then use 1:1 VGA mode. Otherwise, you NTSC mode.

[vigi_lante]

Man...you don't understand...I'm not capturing anything....I just have a MPEG video...please...pay
attention in my first words.

Thanks to reply this topic.

[Sefy]

It doesn't matter if you re-encode or unpack and then encode, either way you will lose quality, MPEG is not like ZIP that you can compress and when you unpack you get the original back, it loses quality so it can encode and you can't get it back.

[vigi_lante]

So...what's the best way to convert a mpeg video that is not in vcd format to vcd format without lose quality?

<font size=-1>[ This Message was edited by: vigi_lante on 2001-09-04 20:42:34 ]</font>

[iant]

It would be handy if we had some idea of the mpg you want to convert. Is it mpeg1 or 2? What bitrate? what frame per second? etcetera.

These will help folks get some idea of the current quality or even if a conversion is possible.

[vigi_lante]

I'm talking about videocd...what kind of mpeg do you
think I want to convert? Bitrate doesn't matter....
PLEASE try to understand...Example: I just finish to
download a mpeg1 video(352x240 29.97 frames 1500
kbits)...ok....I will try to burn it into a videocd with
Nero...ok...Nero tell me that the Stream encoding wich
is invalid for a VideoCD or any other kind of invalid
video stream (frame,resolution etc...) ...ok...
I open the TMPGEnc to re-encode it into compliant
VCD-format...I will lose quality with this? so...there's
no way to play this video in my dvd player without lose
quality?

Thanks guys to spend time with my problem....

[flaninacupboard]

two things. open mpeg tools in tmpegnc, and use simple multiplex to remultilpex the file to video cd(non-standard) and in nero make sure you DO NOT tick "make standard comliant cd"
this will now work, assuming your DVD will play XVCD's.

[iant]

The probability here is that the mpeg you describe has a slightly different blocking factor. From your description, it appears to be a standard NTSC VCD format but if Nero rejects it, there must be some slight difference. I have seen at least one encoder that used a differing blocking factor ( their term...I don't totally understand it but I found out how to beat it )which resulted in Nero or VCDImager screaming that the mpeg was not compliant.

If you can get hold of a copy of IFilmEdit you can load it into that and copy the whole mpg to a new copy that should be vcd compliant. Or, if it can't do that, it should at least tell you exactly why it's not vcd compliant.

Unfortunately it's commercial software so you may have to look around a bit.

Sorry if it seemed like I didn't understand but your initial post was talking about re-encoding the mpeg. Normally somebody would only be thinking of that if it was a higher quality mpg or even an mpg2.

You could, considering how close the mpg parameters are to standard, just try turning compliancy off in Nero and trying it that way. I'd recommend a CD-RW for that one so you don't end up withj a coaster if it doesn't work.

Hope this helps,
Ian

[Sefy]

From your details on the file, it seems like it's using 1500kbps, while VCD standard is 1150kbps, basicly it doesn't matter how you encode the file into VCD Compliant, you will always lose quality compared to the Original file, because you are encoding an already compressed file so there are less details to work with, you can try to burn like was suggested earlier by turning off the compliancy check in Nero, but if it plays depends on your DVD Player.

If it doesn't work, you must re-encode the file using TMPGEnc and load a VCD NTSC Template, again, it will cause the file to lose quality by how much, I don't know.

[ccngo]

Now, will the original source file lose quality or the output file lose quality?

[Sefy]

Just the output, your source will remain as it was.

[vigi_lante]

flaninacupboard:

It's looks like that will work fine,but don't you think it's exaggerate to make XVCD when it's not necessary?
Why burn like a XVCD? VCD will not work?
What remultilpex does with the video?
Why a need to choice video cd(non-standard) instead of standard? Because it's a XVCD?
No quality lose,right?


Iant:

I will try to take a look in this program...and Nero tell you exactly why it's not vcd compliant too.

Sefy:

Turning off the compliancy check in Nero is a possibility too,but I don't know if all my videos will work in this way...so...I think it's better do remultipex the video.

_________________

If I have a video that is not in VCD NTSC standard like:
Picture Size: 320 x 240
Bit rate: 1177600 bits/sec
Frame rate: 30 frames/sec

How I need to procced to play this video in my dvd player without lose quality?

thanks so much....

[Sefy]

Basicly, nearly any DVD can play XVCD, so you could just turn off the compliancy check, which means that file you mentioned could work, cause it's not that far off VCD, and demuplexing and multiplexing I doubt will do anything, you are simply splitting and combining the same file, if you re-encode, it will lose quality, try using a CDRW and see if your DVD Player can accept XVCD, will safe you alot of time and agony.

[schwinn]

What works for me. I regularly get mpg files from a friend that aren't VCD standard and while I can burn them they never play correctly. They have glitches and hang for a few seconds or even min. at times. This is what works for me."VCDIMAGER Easy" found on this site under "Author & Burn VCD etc'. Then under "How to burn a mpg to VCD" you do end up with a .bin and cue file but most programs will burn this. The great thing is it only takes a few minutes to run VCDIMAGER. The quality is better to the eye then it was before so it seems no lose of quality. The "experts" here are sort of missing the point of your question and making things harder then they need to be IMHO. I use the VCD 2.0 setting. Just for fun I tried the SVCD setting with a mpeg 1 file. It burned and plays on my computer but my DVD can't play it.I thought it might work because I think Sefy has a template that uses mpg 1 for SVCD... I hope this helps Schwinn

[vivisimonvi]

<TABLE BORDER=0 ALIGN=CENTER WIDTH=85%><TR><TD><font size=-1>Quote:</font><HR size=1 color=black></TD></TR><TR><TD><FONT SIZE=-1><BLOCKQUOTE>
On 2001-09-05 16:44:28, flaninacupboard wrote:
two things. open mpeg tools in tmpegnc, and use simple multiplex to remultilpex the file to video cd(non-standard) and in nero make sure you DO NOT tick "make standard comliant cd"
this will now work, assuming your DVD will play XVCD's.
</BLOCKQUOTE></FONT></TD></TR><TR><TD><HR size=1 color=black></TD></TR></TABLE>

What does it matter if "standard compliant CD" is checked or not? My XVCD files seem to play fine on my DVD player even if the box was checked and burned onto disc.

[vigi_lante]

Demuplexing and multcompliant convert the video into a "compliant VCD-format" , but I don't know exactly how it works and I don't know if it will make difference instead if I burn just without compliancy check...
I don't know too how transforme the video into a bin file can make difference...I still trying to find the best option.

Thanks a lot guys...