GH1 First impressions and footage

soundxplorer said:
Philip, I have a question about this video:

http://vimeo.com/groups/gh1/videos/4441911

During the close-up of the fire (around 1:20) I see lots of horizontal line "glitches", kind of like what you get when the shutter is half closed during a flash, but not quite exactly like that.

I've seen these "glitches" in other Vimeo and YouTube videos as well, though they seem more apparent when filming fire like that.

Does everyone else see that too?
Anyone know the cause?
I'm thinking:

1. It's caused by compression or frame-rate reduction needed for Vimeo/YouTube.
2. It's because my computer is too slow to stream the video properly (or I need an updated codec).
3. It's an artifact in the original video (hopefully not).

If it's not in the original video, how do you avoid it when posting vids to Vimeo or YouTube?
Click to expand...

I think what you are seeing is tearing: http://en.wikipedia.org/wiki/Screen_tearing
It's not a problem with the camera.
 
soundxplorer said:
Philip, I have a question about this video:

http://vimeo.com/groups/gh1/videos/4441911

During the close-up of the fire (around 1:20) I see lots of horizontal line "glitches", kind of like what you get when the shutter is half closed during a flash, but not quite exactly like that.

I've seen these "glitches" in other Vimeo and YouTube videos as well, though they seem more apparent when filming fire like that.

Does everyone else see that too?
Anyone know the cause?
I'm thinking:

1. It's caused by compression or frame-rate reduction needed for Vimeo/YouTube.
2. It's because my computer is too slow to stream the video properly (or I need an updated codec).
3. It's an artifact in the original video (hopefully not).

If it's not in the original video, how do you avoid it when posting vids to Vimeo or YouTube?
Click to expand...

download the .mp4 version. you won't see it in that...only in the streaming flash version on vimeo
 
SonicStates said:
Damn you Mr. Bloom!!!! I'll get you next time!!! Oh well, I think I have most of it hard wired in my head by now (yeah right)...if you change your mind I wouldn't be unappreciative if you would PM me :love4:

EDIT: BTW I'm liking that Matte box setup you have going there.
Click to expand...

if you ask really nicely i can sort you out!
 
Philip, excuse me that I repeat this question but it really interests me: Do you have any thoughts about the PAL version compared to the NTSC version, especially codec-wise? Is it possible that the result of 25P over 50i is superior to 24p over 60i?
 
Not to get too far off topic but it was alluded to earlier. A wide like the tokina 11-16 would have to be used wide open, correct? because it has no aperture dial on lens body? but how about a nikon D lens that has the aperture ring, can you adjust aperture manually on one of these lenses? obviously this is directed at Phil, Kholi or anyone else who might be using these sorts of lenses currently.
 
I got some 11-16 footage. Use it wide open or adjust it with something plugged into the Iris piece. I'm going to modify my Nikon mount to have a screw and pin system that'll open it as you twist the screw.
 
joe 1008 said:
Philip, excuse me that I repeat this question but it really interests me: Do you have any thoughts about the PAL version compared to the NTSC version, especially codec-wise? Is it possible that the result of 25P over 50i is superior to 24p over 60i?
Click to expand...

no idea as only used the 25p version
 
yeah you said 50, but it sounds bizarre and I thought maybe you were on the piss

the manual you gave me is the US one do you have a UK one to refer to?

I'm trying to find out what the bit-rate for the 50p mjpeg is
 
yes, the manual is the US one, don't have a UK one...and yes it is 50p and no I don't know bit rate off top of my head. sorry.
 
ok np

the US model does about 26Mbps @ 30fps mjpeg. I'm trying to establish if the UK (PAL) model is maintaining that bit-rate @ 50fps.
 
almost except only one mjpeg @ 50p and 1280x720/25p AVCHD

erm correction 1280x720/50p AVCHD
 
Last edited:
I just can't get my head around 50p instead of 25p mjpeg. 25p mjpeg @ 26-30Mbps would be ideal for my filmmaking needs
 
You must log in or register to reply here.
Back
Top