QUESTION FOR VIDEO FORMAT/ENCODING EXPERTS ONLY!

[Trenton_Net]

Hi,

I have a rather intresting technincal question. When I have a DVD decoded, i have one of many options to encode this video to a VCD. However every program I use, It seems that the resultant MPEG has a blury effect which trails fast moving objects in a movie.

If I were to slow the movie down, it seems during a fast motion area, the objects motion blurs then clears up and blurs again, quickly where as the original DVD has the object clear and focused during its movment (Ie the fames don't smear)

I don't know why the video isn't just taking each frame and resizing it, and why such effects/phenomina takes place.

I think this could be due to interlacing or or how the scanlines are drawn on the screen, or also, maybe the resolution which im saving to (352x240) which is causing
the odd bluryness since it has to drop scanlines during the process or something.

If anyone can contribute, it would be greatly appreciated.

Thanks,



<font size=-1>[ This Message was edited by: Trenton_Net on 2001-07-30 20:23:00 ]</font>

[patrickm]

it's because there just aren't enough bits to describe the picture as accurately as in the DVD MPEG-2 stream. if you reencoded at like 12 Mbps, you'd have no problems with blockiness or blurriness unless your encoder was really terrible.

the ghosting effect can be caused by a deinterlace/blend. use adaptive deinterlacing instead. it only interpolates when combing effects are present.

[Trenton_Net]

Hi,

Yes, the problem is not blockyness, but the bluring which occures. Its like a camera lense which focuses in and out fairly quickly which causes blury pictures when the camera quickly pans a scene or an object moves quickly.

I think it must be the interlacing, but im not sure which program provides adaptive deinterlacing. The programs I primarly use for encoding is Panasonic encoder, and Tmpgenc.

Actualy when I use tmpgenc, and press Deinterlace, I get a multitude of options. Im not sure which one would be best for me. Since the only videos that have this interlaced/motion issue is DVD, which one would people recomend to use, to make the video as close to DVD, with no motion problems as possible?

Thanks,


<font size=-1>[ This Message was edited by: Trenton_Net on 2001-07-31 13:27:37 ]</font>