Which is better MPEG-1 or MPEG-2 after all ? XVCD<-->

[Umen Pich]

I read somewhere here in one of the guides that actually MPEG-2 had a lower compression ratio. Does it mean that from two clips with equal file size the one which is MPEG-1 encoded will look better than the other (MPEG-2 coded) ???

If that is true, and if your DVD player supports XVCD than recording SVCDs doesn't make sense, right ?

thank you.

[vitualis]

I don't know where you read that, but at a similar bitrate, MPEG-1 and MPEG-2 probably perform approximately the same.

MPEG-2 has a number of advantages over MPEG-1, however, including support for interlaced video.

Furthermore, making something that is compliant always makes sense in that you can be reasonably assured that the disc will work as expected in future players as well.

Regards.

[Umen Pich]

I don't know where you read that, but at a similar bitrate, MPEG-1 and MPEG-2 probably perform approximately the same.

in the guide called "MPEG and all that, essential reading for newbies"
it is said:
MPEG 2= This Is really a lesser compressed version of mpeg 1....

MPEG-2 has a number of advantages over MPEG-1, however, including support for interlaced video.

Are you saying that it is a matter of chance that particular player will play successfuly an MPEG-1 with more than 240 vertical pixels (for NTSC) ???
Because what I see in that case with my player is a jerky picture and sound.

thank you.

[vitualis]

I don't know what that is supposed to mean (lesser), but MPEG-2 and MPEG-1 has about the same quality per bitrate when all other things are equal.

MPEG-2 has a number of features over MPEG-1 which makes it useful.

Are you saying that it is a matter of chance that particular player will play successfuly an MPEG-1 with more than 240 vertical pixels (for NTSC) ???
Because what I see in that case with my player is a jerky picture and sound.

Basically yes. Any player is only guaranteed to play in specification VCDs and SVCDs (and sometimes not even those!) XVCDs are basically off-spec discs. Although many players are quite relaxed with what they can handle, it is essentially luck as to whether or not any particular player will play any particular XVCD disc.

Regards.

[gll99]

Because what I see in that case with my player is a jerky picture and sound.

There could be many causes of your problem
Jerky video is sometimes a framerate issue. Don't know where you are located but in the case of NTSC many players do not support 23.97 but work fine at 29.97. They display this jerky stop/start effect every few seconds.

[Umen Pich]

There could be many causes of your problem
Jerky video is sometimes a framerate issue. Don't know where you are located but in the case of NTSC many players do not support 23.97 but work fine at 29.97. They display this jerky stop/start effect every few seconds.

I believe that is the problem. On 29.97 everything is OK.
The additional problem is that I have a PAL videocamera and 23.97 is easier to convert to. Well I guess I should use only MPEG2 with 29 to 23 pulldown.
Greetings from Kingston, Ontario.