Originally Posted by Ungermann
Can be errors accumulated in a GOP. 30p and 30i GOP is 15 frames, 24p GOP is 12 frames. Not sure what the GOP is for 60p. I believe the Panasonic GH1 had a similar issue. Also, I see the same issue when I encode with MainConcept MPEG-2 encoder from Vegas, reducing GOP structure to just 3 frames helps, but you cannot do the same in the camera. Do you shoot MPEG-2 or AVCHD?
Wow, Ungermann, I am impressed by your knowledge and insight!
I think you have hit the nail on the head.
Unfortunately, it does not help me with this problem (although I will certainly keep it in mind when editing - I do use Vegas Pro 10 (about to upgrade to 11
) . Yesterday, I did an exhaustive comparison of the NX70 against the CX550V and put some of the results into a little video:
NOTE: The video below contained some inaccuracies; a new video has been postedhttp://www.youtube.com/watch?v=e33EN-Ubi3Y
NEW video with better information:http://www.youtube.com/watch?v=5cEHhvpfhos
As far as compression, I both cams are identical at 1920x1080 with the 60i frame rate, but the new "PS" Mode (1920x1080 60p) is different. The NX70 exhibits the pulsing pixelation in low light at 1920x1080/60i, but the CX550V does not. I see the problem even with direct HDMI output to my Samsung LCD TV. I'm speculating that the changes Sony made to the CODEC to accommodate the new 24p and 60p frame-rates might have broken something. From the NX70 specs:
Video Recording Format:
HD MPEG-4 AVCHD format compatible+1080/60p original format)
MPEG-2 PS (Same as DVD)
Recording Frame Rate NTSC Mode
PS (28 Mbps) 1920 x 1080/60p/16:9
FX (24 Mbps) 1920 x 1080/60i/16:9
FH (17 Mbps) 1920 x 1080/60i/16:9
HQ (9 Mbps) 1440 x 1080/60i/16:9
LP (5 Mbps) 1440 x 1080/60i/16:9
FX (24 Mbps) 1920 x 1080/24p/16:9
FH (17 Mbps) 1920 x 1080/24p/16:9
If it were just the pixelation and the zoom-rocker problem, I might be able to grit my teeth and live with it. But, add in the washed out colors (no way to adjust saturation on the cam and I'm not going to constantly apply hue/Saturation effects in post-production), crappy auto-while balance (I know that "Pros" are not supposed to use Auto but come on, this is $3K unit and it ought to work at least as good in Auto as the Cx550V), markedly inferior Steady Shot compared to the CX550V, worse auto-focus hunting, less effective zoom in Active Steady Shot, only two brightness settings for the LCD, WAY worse menu layout on the touch screen, impossible to display recording time on the display, no GPS on/off switch - all the other great features don't matter. I just don't like the camera. I've started the return process.
I'm very sad and frustrated. I thought this camera was going to be the ONE. Now I don't know what to do. I've spend months carefully considering and rejecting dozens of other units from all manufacturers ranging in price from $900 to the $4K Sony HXR-NX5U. At this point, even though I can't afford it and it is way to large for my purposes, the only one left is the NX5U. I'd like to rent one to see if I can live with it. No local firms rent.
Anyone have any ideas about rentals where they are willing to ship the camera?