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500d development

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Offline Ulysses

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Re: 500d development
« Reply #2170 on: 19 / December / 2011, 05:19:03 »
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Yeah, with the build from kyselejsyrecek the timing seems to be correct now. I noticed when I press the record button, ot takes about a second or two to apply exposure from the chosen frame rate and this is recorded too, so the first frames from the video always get a darker or brighter image then it will be from the rest of the clip.

A1ex: Can you raise the maximum frame rate limit for me to test it? From 30 to 37 in 720p doesnt seem to be quite a difference (despite the ability to shoot in 24p, which is great!). If possible, something like 48 FPS in 720p. In 1080p I got only 21 FPS when we had 20 from already the firmware. Couldnt it be raised to at least 24FPS in fullhd?
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Offline Ulysses

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Re: 500d development
« Reply #2171 on: 19 / December / 2011, 05:43:13 »
Ok!

Should be something wrong with the timmer 'cause I stopped when it reached 5 min on ML screen, but reading now it just gave 4:22. Big difference. Did the same in 24p, stopped at 3min and was actually 2:38 (interpreted as 23,976)

Well, my 5 min (00:04:22:21) in default 30p gave me 7881 frames.
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Offline arnarg

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Re: 500d development
« Reply #2172 on: 19 / December / 2011, 06:17:28 »
I tried recording a 5 min video, the camera stopped at 01:06 (I was pointing it at a stopwatch) I think I just need a better speed class sd card :P anyway, the fps override was set to 30. As I said earlier I recorded for 01:06 but the clip was only 00:57.27 (according to After Effects) and 1737 frames.
Hope that helps you :)

EDIT: afterwards, I tried finding the right framerate for the clip and it was 26. (very close to it)
« Last Edit: 19 / December / 2011, 06:24:18 by arnarg »
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Canon EOS Rebel T1i
Canon 18-55 kit lens
Zenitar M2S 2/50mm

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Offline a1ex

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Re: 500d development
« Reply #2173 on: 19 / December / 2011, 06:54:37 »
Should be OK now. I assume 20fps mode is PAL.

What's the exact frequency in NTSC in 500D? 29.970 or 30*1000/1001?
« Last Edit: 19 / December / 2011, 06:57:01 by a1ex »
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Offline mk11174

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Re: 500d development
« Reply #2174 on: 19 / December / 2011, 07:02:19 »
Quote from: a1ex on 19 / December / 2011, 06:54:37
Should be OK now. I assume 20fps mode is PAL.

What's the exact frequency in NTSC in 500D? 29.970 or 30*1000/1001?
NTSC is 29.970 but all programs that you open a T1i file in is 30 I guess cause its not interlaced. I am recording all 3 modes now, on 1080 now just to confirm everything with last build, full 5 min on all 3, even set a digital clock count down in front of the recordings LOL Oh and all at there standard frame rates too
« Last Edit: 19 / December / 2011, 07:03:57 by mk11174 »
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Offline a1ex

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Re: 500d development
« Reply #2175 on: 19 / December / 2011, 07:07:34 »
Revised the computations: with both 29.970 and 30*1000/1001, the end result is the same due to rounding. So I think it.s 29.970 in all cameras.
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Offline Ulysses

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Re: 500d development
« Reply #2176 on: 19 / December / 2011, 07:10:47 »
Well, it is still playing at the default 30fps, no changes with that regard. The only thing I saw different was I could go down to 4 fps. then I could get up to 32FPS, with 33fps LV wasnt refreshing properly (like it was kind of 15fps), with 34fps the LV stops refreshing and freezes, with 35 the camera reboots with LV flickering.

EDIT: before I could get to 37fps with no problems

And yes, its matching the showed recorded time with the actual file length.

500D always was 30FPS, not exactly 29,97, which is too close. Just like 5D qhen it started recording videos. If I´m not mistaken, it doesnt conform to NTSC or PAL, just pushes the frame rate at 30 and thats it.
« Last Edit: 19 / December / 2011, 07:18:14 by Ulysses »
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Offline a1ex

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Re: 500d development
« Reply #2177 on: 19 / December / 2011, 07:31:00 »
If it was always 30fps, the closest thing I can get is 29.961.

Now, probably ML displays 29.97 but the camera records at 30.

20 and 30fps have different timer values; this suggests that they took care of PAL and NTSC somehow. They could make 20.000 and 30.000 fps with a single timer (the one at 24.66 kHz) but they didn't.
« Last Edit: 19 / December / 2011, 07:33:45 by a1ex »
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Offline mk11174

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Re: 500d development
« Reply #2178 on: 19 / December / 2011, 07:33:25 »
Ok, just to confirm I recorded exactly 5min
480P      same as 720P
720p      7890frames  4m  23sec
1080P    5997frames  4m  59:850sec
 Latest patch u just posted results
1080P    6002frames  5m  00.100sec
720P      9002frames  5m  00.067sec

Update also confirming
720P recorded with 24fps setting then interpeted at 23.976   7198frames    5min 0:00.217sec
« Last Edit: 19 / December / 2011, 07:51:02 by mk11174 »
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Offline Ulysses

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Re: 500d development
« Reply #2179 on: 19 / December / 2011, 07:54:26 »
Yeah, in after effects it displays the exact frame rate, not rounding. If I have lets say a video 32 FPs, it shows 32 FPs, if its a video with 43,72 FPS, it displays the right number. So, with all files from the 500D it always shows 30fps

EDIT: After Effects show the exact FPS number, but the one in the header. It doesnt perform any calculations, although we can change the playback rate or interpret footage at will.

I really dont know what the PAL and NTSC options on the 500D do. As for me, it just records the video in 30p and thats it. Not conforming to any standards. Just as when you convert a video or create an animation at any given frame rate. You create any video or animation with the frame rate ou want, but you need to be specific to conform to NTSC or PAL, otherwise the video will work without any problems, its just not conformed to the NTSC or PAL standards. Which I think is the case of the 500D...
« Last Edit: 19 / December / 2011, 08:03:42 by Ulysses »
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