24pA Shooters BEWARE!!

ZippyGaloo wrote on 7/18/2003, 12:21 AM
If you shoot 24pA you WILL have "marching ants" / Moire / strobing / artifacts" viewable in your footage!

I shot/tested some footage in 24PA on the Panasonic AG-DVX100. 24PA is the 24 frame progressive mode with (3-2-2-3 Pulldown). When I viewed the footage on a normal NTSC TV "marching ants" / Moire / strobing / artifacts" appeared on the edges of certain objects and subjects. IT LOOKED HORRIBLE! Nobody has been able to offer a suggestion for fixing the problem. The only choice is to live with it.

UPDATE: I swaped out the RCA cable I was using to connect the camera to the NTSC TV for an S-Video cable and the "marching ants" / Moire / strobing" practically disappeared.

BUT, PROBLEM NOT SOLVED! Most people will view the footage from either a camera (used as a deck), a VCR or a DVD that connects to their NTSC TV via RCA. Those that use an S-Video cable are exempt from the problem. But, there is no way to eliminate the problem via RCA connections! Just BEWARE of this problem if you think you want to shoot 24pA.

Comments

PDB wrote on 7/18/2003, 2:55 AM
ZippyGaloo,

I am by no means an expert at this but I too have purchased the pal version of the dvx. As far as I have read, I believe that the issues you are seeing are because you are playing back from the minidv tape which in effect is recording two "frames" (or something to that effect) for every prograssive frame so that it can be stored on the tape. On pulling the video into Vegas, the pulldown will remove the extra frames recorded and leave you with the 24p, which once transfered to film or to a progressive dvd will play back nicely....

If you haven't com across these sites, I suggest you check them out since they are full of knowledgable people on the 24pA, the agdvx100 and Vegas. Might be worth asking for "real-life" advice/explanations there.
try:

http://www.dvinfo.net/conf/forumdisplay.php?s=a3ed074c3dc7533d8fc5886bf56bee1d&forumid=47

http://www.dvinfo.net/conf/forumdisplay.php?s=a3ed074c3dc7533d8fc5886bf56bee1d&forumid=31

http://www.2-pop.com/ubbthreads/postlist.php?Cat=&Board=PanasonicAGDVX100Camera

http://www.dvxuser.com/cgi-bin/DVX/DVX.cgi

Hope this helps,

regards

Paul.
RBartlett wrote on 7/18/2003, 3:24 AM
ZippYGaloo has wisely warned folk of using low grade link-ups to monitors for DVX100, particularly if folk really want to analyse their 24p work (as played back as 24pA). Subrate capture always looks a bit odd as NTSC. 3:2 pulldown reversed does have a following as being the film-look for TV - but that is an NTSC phenomenon - not worldwide.

24pA is of course the recommended mode to record in on the camera. However it needn't ever be seen in a viewer capacity - it is an interim storage format that in our case suits the NLE.

Thanks for the in-the-field warning ZippYGaloo - don't forget the Y/C monitor!