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View Full Version : AVCHD@15mbit or MPEG2@30mbit ?


Gannjunior
2nd May 2007, 17:41
i hope this is the correct subforum...

...I'm going to buy an hd camera but i'm dubious if buy an avchd or not.

We all know the high potential and efficiency of AVC compared to the old mpeg2. It is so efficient that it is able to give the same quality of mpeg2 but with a very lower bitrate.

The problems of the post editing should be solved within very short time: for example the next week will be possibile to buy pinnacle studio 11 that has fully support for avchd and so on for others famous editing sw...(as you can learn from the avchd main site).

My choose is between sony hdr-SR1E and the panasonic HDC-SD1.
i can find the sony at about 1300 eur and pana at 1000 eur...
i should prefer pana, not only for the price but also for the 12x zoom , the presence o 3ccd that i prefer to the cmos and also for the SD storage, that i prefer to Hard disk storage (since that if the hdsik should be broken, it would be more expensive to change etc etc..)

But i recently seen the last JVC: the GZ-HD7 Everio FullHD HDV.
But it's very expensive...about 1600 eur...
This camera is very interesting beacuse it's able to acquire at 1920x1080 at 30mbit mpeg2....very very interesting doesn'it (since the medium of the actual consumer hdv camera is between 18 and 24 mbit mpeg2) ?

The above before mentioned avchd cameras is able to acquire at 15mbit AVC.

The interesting thing is that the considered JVC as an advanced Fujinon Optics compared to the Zeiss and Leica (both very nice) optics of sony and pana respectively. But i suspect that the Fujinon in the considered jvc could be do the difference.

what do u think?

thanks in advance

ciao!!

Pookie
3rd May 2007, 06:04
AVCHD flickers like a strobe light (at least to my eyes).

scharfis_brain
3rd May 2007, 06:25
@Pookie: can you explain that more detailed?

@Gannjunior: If I'd got the option to choose between 15mbps AVC and 30mbps MPEG2 then I'd choose the latter one, because:
- MPEG2 is more compatible so you got more applikations to work with
- at high datarates the efficency of different codecs will become more and more comparable (e.g. equal), so you'll get a better image using 30mbps MPEG2

Pookie
3rd May 2007, 07:27
Of course, @scharfis_brain, and perhaps you can shed some light on it. Found links to a number of .MTS samples on this page:

http://www.camcorderinfo.com/bbs/showthread.php?t=132542&page=4&pp=15
Most of those are 19-40MB in size. The outdoor shots are worse. The one I can't stand looking at is the now famous "Two Dogs" video (85MB)

https://oncourse.iu.edu/access/content/user/rtknapp/00003.MTS


What makes my eyes go crazy are the zooms. In case you don't have coreavc (the joy of PAFF) you can demux

xport -h file.mts 1 1 1
http://www.w6rz.net/xport.zip

ldecode with reference decoder

ldecod -i bits0001.mpv -o raw.yuv
http://mirror.brokenlogic.net/jm12.2.7z

load as rawsource in Avisynth

rawsource("raw.yuv" ,1440,1080,"I420")

(accolades to drMpeg for this procedure)

Maybe the flickering is PAFF related. Also, the whites are "blown out". And finally, I'm viewing this on a 60hz LCD display.

For an experiment, try bobbing...