Gh2 record 23.8095 fps !!!

V

volga

Member
Men! I've uploaded the video GH2 in Motion 4 - 23.8095 FPS!


the last file on youtube lined, too, was the same framerate!
I downloaded it in edius 5.51 - and he determined that 23,810
is what I wrote here
=====
Panasonic representative answer! why such a framerate of your camera while recording video !!??
I and many in Russia waiting for a reply from Panasonic!
not be such a coincidence! I uploaded totally 2 different videos and they have the same framerate!

have tried to change the frame rate - obtained bad! lubricant is very big and incomprehensible! themselves look


http://vimeo.com/15194701

can it unfinished sample GH2? i promise

может это недоделанный образец GH2? ?
виталь я ведь з а-е у тут всех
не мне одному нужны ответы
 
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I downloaded the file GH2 from youtube
youtube does not change the frame rate when downloading
so I'm asking - what is the framerate?
 
Those videos from YouTube and Vimeo are from same person. I fully agree that conclusions should only be made by looking at the native files.
 
volga said:
Edius broadcast 5.5 defines them as 23.810
Motion4 - 23.8095
WHY?
Click to expand...
Because they've been re-encoded by YouTube. And during that re-encoding process, apparently YouTube's encoder set the frame rate at 23.8095.

But the camera original raw mts files are going to be 23.976.
 
Double what Bary said.. youtube does weird things to frame rate for it's own bandwidth purposes and also it does not like .mts files very much. I get better quality youtube encode from a 20 mbit mpeg4 I made myself than from an original 50mbit .mts native clip
 
Actually, I'm not certain what the framerates are yet. What StreamParser reports is theoretical. There are several time-stamps in these streams, so depending on which one you use, results can vary.

Chris
 
The frame rate has to be based on the 90KHz clock (per the AVC/h.264 standard). Assuming it is actually exactly 90KHz the framerate has to be something equal to 90,000 divided by an integer (probably an even number). That would mean the actual frame rate could be 23.987, 23, 974, 23.962, etc... 23.8095 is possible because 90,000/3780=23.8095. As for how they report the framerate - well, they can stuff whatever number they want in some of the timing variables. 23.976 is the IVTC film standard, which it appears the GH1/2 cameras (or, any AVC cameras for that matter) don't hit exactly. Given component variations, temperature, etc... 23.974 seems more than close enough. 23.8095 is a little off and I suspect (hope) this will change with the final version of the camera.

Chris
 
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Anyone knows the reason why NTSC is not 30fps (90000/3000) and 24p is not 24fps (90000/3750) ?
After all, PAL 25p=25fps (90000/3600) so I don't understand why such weird framerates for NTSC countries.
 
It dates all the way back to 1953 when color TV was introduced in the US. According to http://en.wikipedia.org/wiki/Frame_rate:

"60i (actually 59.94, or 60 x 1000/1001 to be more precise; 60 interlaced fields = 29.97 frames) is the standard video field rate per second for NTSC television (e.g. in the US), whether from a broadcast signal, DVD, or home camcorder. This interlaced field rate was developed separately by Farnsworth and Zworykin in 1934, and was part of the NTSC television standards mandated by the FCC in 1941. When NTSC color was introduced in 1953, the older rate of 60 fields per second was reduced by a factor of 1000/1001 to avoid interference between the chroma subcarrier and the broadcast sound carrier."

If you take 24 and apply the 1000/1001 ratio you get 23.976. The framerate is derived from the old 60i (59.94) fieldrate because it is assumed that footage will have a Telecine applied to it to get to the 29.97 framerate. Telecine converts framerates by adding duplicate fields; for every 4 fields 1 duplicate is added, resulting in a ratio of 5/4. If you apply the 5/4 ratio to 23.976 you're back to 29.97.

Chris
 
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