AVCHD to 720P

[Friday007]

I have a Panasonic SD9, the video I captured is full HD (1920X1080i), the files size are too big and it is hard to be played on my HTPC (P4 2.1G), I successfully re-sized and compressed to DVD and got smooth vidio, but the definition of the DVD can not meet my requirement (on 50' plasma TV), therefore I am trying to create 720P instead of DVD, but I met big problem and I hope somebody could help me....
As you know, the Full HD is 1080i, if I need create 720P video, I have to do deinterlance, but I can not find a best way to do it, all the video I made are flicker in moving vision. I tried to make 1280X720/50P video that means make each field to a single frame, the video looks great! I just thinking if I can just remove odd (or even) filed to make 720/25P? Is there any tool can make it happen? Thanks in advance!

[Ghitulescu]

While SD-cards are still more expensive as their counterparts of the same size (DVDR, :)), it would be played by the camcorder itself. That would be my first option.
Second option would be multiAVCHD (output to DVDR, maybe BDR) but this requires a BDplayer.
An alternative that are more and more used today is the use of a mediaplayer.

It appears to me that you don't know what DV is -> http://en.wikipedia.org/wiki/Dv. Your camcorder is not DV but AVCHD.

[Friday007]

Yes, you are right, it should be AVCHD.
I usually play the first time by the camcorder itself, then, I have to backup them to another medias...( I only have one 16G SD-card )
So far, I backup the videos by DVDR, and also stored another copy in HD.
and My HTPC need to be upgraded, it can not play 1080i video clips smoothly, therefore, I am trying to downgrade the 1080i to 720P......

[Emulgator]

Decoder dependent, and CPU-instruction set dependent,
with a P4 2.1 GHz it may come to bottlenecks.
If you got to squeeze the max out of an older CPU (I just tested SD on a P4m 2.0 GHz)
you may try DiAVC as software decoder (9.99USD if you buy, a chinese product, BTW),
which since 1.2.0 is capable of playing MBAFF interlaced encoded .264 elementary (!)
@L4.1 SD from a recent x264 build.
Which looks very useful. I did not test 1080i yet, but soon to come.

[Friday007]

I am using "FinalCodecs2010sp" as the decoder, I can play 720/25P or 720/30P mkv packaged movies with my HTPC, CPU is almost 100% already, 720/50P is still acceptable but it is not perfect smooth already, to play 1080i is a big challenge to it, if I can not find a way to build 720/25P with 1080/50i AVCHD resource finally, I may give up and buy a new HTPC... but I am still interested in study how to convert 1080/50i to 720/25P and have acceptable quality. Thanks for your suggestion.