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Forum: Video Recording and Processing
08-02-2011, 12:09 PM
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Like some of the others on this thread, I tried out the K-x hopefully for video, but once the Panasonic GH2 became available I bought that and use my Pentax lenses with it.
Some of the advantages of the GH2 over the K-x, used with Pentax lenses, are:
- sharper, less moire and much less jello (google those terms if unsure)
- choice of framerates: 1080p24, 1080i60, 720p60
- when hacked (safe and easy) becomes PAL<_>NTSC switchable
- when hacked to allow for high AVCHD data rates, produces awesome quality shooting for much longer than mjpeg before the card fills up - and no overheating issues!
- connection for external microphone, good quality audio circuitry, adjustable levels
- cheap lens adapters let you attach many legacy lenses (Pentax, Nikon, Minolta MD, Canon FD, etc etc)
- viewfinder enlargement for manual lens focus assist at the click of the control wheel
- LCD screen tilts, rotates, flips
- fully manual shutter, ISO and f-stop control
That said, I like the stills from my K-x a little better, and the K-x's APS-C sensor provides slighly better depth of field and perhaps field of view with lenses you may already have.
I wouldn't even consider using a Canon DSLR in their present state, so can't help you with the merits of those.
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Forum: Video Recording and Processing
01-27-2011, 01:16 AM
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Of course, in combination with manual shutter speed control. You're not trying to have us believe that Red operators let their shutter speeds waft around randomly in between their ND-filter changes, are you?
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Forum: Video Recording and Processing
12-01-2010, 09:11 PM
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@mwilliam: interesting, it certainly doesn't behave like that on my K-x (I wish it did!).
If I hit AE-lock in P mode then turn to Video mode the * symbol turns off and the exposure starts varying. What firmware do you have?
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Forum: Video Recording and Processing
11-10-2010, 06:03 PM
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Edit using the raw mjpeg, or perhaps convert to a near-lossless avi format (e.g. Cineform).
You dont want to be converting to mpeg2 for editing - that's a lossy delivery format.
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Forum: Video Recording and Processing
11-08-2010, 12:06 PM
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Virtualdub (freeware, for PCs) lets you import a set of jpgs (the term is an "image sequence") and render out as a video at whatever framerate you wish.
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Forum: Video Recording and Processing
11-02-2010, 05:58 PM
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When you post to Vimeo, two things happen. First Vimeo takes whatever footage you have and compresses it into some form of mp4-based streaming footage. If your source is high definition it creates at least a couple of versions - SD and HD - that you can choose between.
In addition, by default it will create a link in the bottom right corner of the webpage that links to the raw clip that you uploaded. You cannot stream this file, you have to download it to your desktop and play it from there. After one week that link disappears, plus its being there is under user control, and some folk disable it so that their raw file is never available.
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Forum: Video Recording and Processing
10-31-2010, 08:36 PM
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Nice post filmamigo. One comment, from the perspective of the K-x which only shoots 24P. 24P is a frame rate that's tough to shoot well even with ideal equipment - you have to tightly control camera movement and be experienced in what's a useable pan and what isn't. In addition, 24P is acutely sensitive to frame rate - as soon as you shoot 24P with a fast shutter everyone, including the non-pros who Pentax are worring about, are going to wail about stutter and strobing and the fact that to anyone's eyes the footage now looks like complete c--p. So yes, everyone wants good exposure, but with 24P the starting point has to first be control of shutter speed. If Pentax doesnt wake up to that, they are never going to be taken seriously as an HDSLR option.
Agree with your comments about codec - look at the excitement high-bitrate MPEG on the hacked GH1 generated. Pentax came soooo close to getting it right ....
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Forum: Video Recording and Processing
10-27-2010, 05:36 PM
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Yeah, it's interesting to try and read their minds on this issue. I kinda excused them not having full manual on the K-x, but I am really fed up that they haven't done so on this next iteration of K-r and K-5 cameras. How lame is that!?
To the point in fact that I've now given up on Pentax for video and am swopping to a Panasonic GH2 plus Pentax/micro4/3 mount adapter. Sad to have to do so.
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Forum: Video Recording and Processing
10-18-2010, 07:16 PM
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I'm sure there are (or will be) adapters to fit various lenses to the Sony NEX line, including the VG10.
And there's the Pany GH1, GH13 and GH2. ... strictly speaking not DSLRs.
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Forum: Video Recording and Processing
10-12-2010, 10:51 AM
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There is a smaller, standard definition option: various websites report it as being 640 x 416, 640x424 or 640x480 ... I will check tonight and confirm which is correct. However this option is still only 24fps.
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Forum: Video Recording and Processing
10-09-2010, 12:11 AM
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Virtualdub is free, and has a very useable framecapture feature.
(Also, it allows you to easily apply a various filters before capturing the frame ... so you could investigate for yourself the suggestion that deinterlacing improves the image).
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Forum: Video Recording and Processing
10-05-2010, 04:12 PM
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Theosixx - before you delete your stuff, may I remind you that you claimed that the Pentax site itself did not indicate the K-x was 24P (emphasis on P). It took 5 seconds on Google to show that was incorrect information. Given that track record, and your refusal to back up anything else you've said to confuse folks, you might want to reflect on why you are getting what you consider to be impolite responses.
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Forum: Video Recording and Processing
10-05-2010, 04:06 PM
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> can u record at all at 30fps
No - The K-x records 24P. It's possible to convert that during editing for playback at 30P, but there is no 30P recording option.
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Forum: Video Recording and Processing
10-04-2010, 03:50 PM
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1) It's 24P, not 25P
2) It has bad jello, as do many of the much pricier 1st-generation vDSLRs. I believe the NEX is better jello-wise, I don't know about the Olympus. There should be plenty of online footage for both, however.
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Forum: Video Recording and Processing
10-03-2010, 07:53 PM
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Firstly, 1280x720 is a perfectly valid high definition format. There is more than one. Heard of 2K, 4K?
Second, since several posters here have confirmed that their K-x output is progressive, I call total bullshit on claims that it is interlaced. The difference is freakin' obvious, particularly at high shutterspeed.
Edit: sorry I should have gone and checked the Pentax company site myself, before posting. Here's what is says about the Kx at http://www.pentaximaging.com/slr/K-x_Black/
720p HD Video
Capture widescreen HD video in full 720p resolution (1280x720) at 24 FPS cinematic frame rate, using any PENTAX 35mm lens.
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Forum: Video Recording and Processing
10-01-2010, 11:42 PM
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Quote: Even at 24P it's still two fields making up one frame.
Post some frame grabs please - I see no evidence of this in my footage.
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Forum: Video Recording and Processing
10-01-2010, 11:34 PM
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The K-x produces progressive 24.0 fps M-JPEG footage.
You can easily confirm this by dragging the footage into Virtualdub (provided you have a Motion-jpeg decoder on board - I use this one: Morgan Multimedia - Home of the MM MJPEG video codec.).
If you are seeing interlaced footage from a K-x there's something amiss with your workflow.
Quote: It's chip actually does 30fps NTSC RS170A.
Got a link for that?
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Forum: Video Recording and Processing
10-01-2010, 06:54 PM
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You need to believe. Manual aperture and exposure, but no manual shutter.
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Forum: Video Recording and Processing
09-24-2010, 08:39 PM
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Well, DVDs are by definition standard def, so thats what all DVD-burning apps produce.
(Yes you can burn high def material to red-laser disks, but they aren't "DVDs" )
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Forum: Video Recording and Processing
09-22-2010, 07:03 PM
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> I've only seen one video from the k-x online.
Really? I'm sure there are more, but manwhile here's one very modest clip that includes both lowlight (the forest interiors) and occasional movement that showcases the K-x's pronounced jello. (There are a few shots that are from a trailcam, not the K-x, but you'll recognise those.) The final third of the clip was shot in very dim light and was noisy, but the footage responded fairly well to some Neat Video plugin smoothing.
The HUGE limitation of the K-7's video implementation, and the reason it will never be taken seriously as a VideoDSLR, is that it has no manual shutter control. Very disappointing!
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Forum: Video Recording and Processing
09-22-2010, 10:05 AM
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All I'm saying is that 35mm films, like you see in the movie theatre, do not use 36mmx24mm frames. When you said a "35mm film camera operator" I assumed you meant a motion picture camera operator, but it seems you meant a still camera "operator." (Unusual expression)
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Forum: Video Recording and Processing
09-21-2010, 05:26 PM
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> full frame" DSLR users can quote FOV in the same context as a 35mm film camera operator
Not entirely sure what you mean, but APS-C cameras like the Pentax are a closer match to 35mm film than a full frame DSLR. 35mm film frames go across the film strip, not along the filmstrip.
35 mm film - Wikipedia, the free encyclopedia |
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Forum: Video Recording and Processing
09-20-2010, 10:06 PM
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Well in case any folk haven't been reading up on the K-5 on other forums, the rumoured video specs I listed at the start of this thread are not entirely accurate. For starters, it seems there's no 1080p30, just 1080p25. More importantly, for me at least, there has been no mention of manual shutter control ...
Up until now, I've believed Pentax could be on the cusp of producing a nice Video DSLR, but now I'm convinced their designers just don't "get it" at all - what a wasted opportunity. Bah!
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Forum: Video Recording and Processing
09-16-2010, 09:38 PM
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Small conversions like 24 to 25, or visa versa, are generally done by retiming the video and the audio by a few percent, and the loss in quality is negligible.
24 (or 25) to 30 is as Tuco describes, with the added complication that when 24P is shown on a NTSC display there is "pulldown" added to match the 30frames/60 fields transmission signal. On a DVD sometimes these extra frames are 'baked in' to the mpeg2 stream, sometimes there's a pulldown "flag" that tells the playback device to add them on the fly. So 30P converted to 24P would actually get displayed on an NTSC as 30P again, but now with pulldown .... which will help it match native 24P.
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