D5100 Bit Rate ?

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Re: D5100 Bit Rate ?

Postby coderat » Sat Feb 22, 2014 6:52 am

peeceeuk wrote:The clarity and colour tones after a simple level adjustment to bring in the blacks and whites is remarkably more natural in the 45. I like what I see.

Can you please post frame pictures to prove that and frame numbers ?

EDIT:
Simeon wrote:... 29MB
... 47MB
... 60MB

I can only download 18mbps. Two others give error:
HTTP Error 404 - File or directory not found.
Internet Information Services (IIS)


Thanks,
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Re: D5100 Bit Rate ?

Postby peeceeuk » Sat Feb 22, 2014 7:02 am

Shall sort that now. In the meantime, change the filename from mpbs to mbps in the address bar to get the final 2 bitrate versions. Not my solution but that of another poster in this thread. I had file not found at first too.
They were all taken at a different time the lighting on the trees is different because the sun has moved but when you adjust a little you can see the tones getting closer to how I think they should look the higher the bitrate. There seems to be more control.
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Re: D5100 Bit Rate ?

Postby coderat » Sat Feb 22, 2014 7:11 am

peeceeuk wrote:Shall sort that now.

Would be great if we can document differences.
peeceeuk wrote:change the filename from mpbs to mbps in the address bar to get the final 2 bitrate versions. Not my solution but that of another poster in this thread.

Works! I adjusted links in original post.

Small comment: because Simeon filmed without sound, overall file bitrate is 4 MBps less. 4 MBps is always reserved for stereo audio.

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Re: D5100 Bit Rate ?

Postby peeceeuk » Sat Feb 22, 2014 7:13 am

All Frame 1 from each clip.

http://we.tl/bSALs1SWgc
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Re: D5100 Bit Rate ?

Postby AluK » Sat Feb 22, 2014 7:34 am

peeceeuk wrote:All Frame 1 from each clip.

http://we.tl/bSALs1SWgc


18mbps has pretty visible macroblocking. 30mbps has some artifacting along high contrast, busy edges and 45mbps looks a little bit cleaner (but maybe due to the lower contrast, since the scene is darker).

Ideal test would be preferably under controlled light. Say, camera on a tripod, inside, filming a bunch of colorful stuff and something with fast movement (a fan or something).
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Re: D5100 Bit Rate ?

Postby peeceeuk » Sat Feb 22, 2014 7:54 am

I agree. I think the most noticeable test where you may or may not notice anything is to get the original files and just see what difference you feel when making adjustments.
A same scene without a lighting change would be more beneficial for test purposes.
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Re: D5100 Bit Rate ?

Postby coderat » Sat Feb 22, 2014 10:33 am

AluK wrote:something with fast movement (a fan or something).

Please no fans - they have strong rolling shutter :(
You need massive movement in screne or difuse light. But controlled light is of course best. After I read this, I do not expect much from it.

I am just wondering about very small dynamic range of D7000/D5100 video footage comparing to stills. Is it because of YCbCr 4:2:2 coding into .mov or is it some picture processing missing?

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Re: D5100 Bit Rate ?

Postby peeceeuk » Sat Feb 22, 2014 1:42 pm

Quite possibly some processing gets skipped to allow the capture to be smooth.
The encoding into .h264 MOV will also be a consideration.
It has to write that data fast I expect. With a still I don't suppose it matters that a little extra time to process and save matters like it does frames in a video sequence.
Perhaps that choice nikon and Canon for that matter seem to favour is for a respectable image quality and to ensure that users with slower cards stand a chance of getting a good clear and smooth capture at a good file size.

All speculative on my part.

If you don't have the option in camera to capture video at a higher Mbps, you won't get support issues from users pissed off that they were sold something that requires higher speed cards to use for best results.
That and it is a consumer item, many typical people wouldn't necessarily notice and be satisfied with what is being recorded.
I have been happy with this camera for recording but seeing that it can be pushed may obviously be beneficial but is also very interesting seeing what you smarter people can find amongst the coding. I thought the liveview shutter control was as good as it was likely to get but an image with more data has clear advantages for post work.

Edit: There are some gamma controls that someone created too for super flat capture. This high bitrate used in conjunction with those picture settings may work splendidly.
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Re: D5100 Bit Rate ?

Postby 4cc3ss » Sat Feb 22, 2014 2:56 pm

I'm guessing many wouldn't use 424 @25 HQ, looking at the original crappy bitrate of 4093 i've upped it up a few ...this will added shortly.

424-2.jpg
424-2.jpg (170.59 KiB) Viewed 892 times
424.jpg
424.jpg (176.93 KiB) Viewed 892 times


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Re: D5100 Bit Rate ?

Postby fusion » Sat Feb 22, 2014 9:32 pm

Here is a quick comparison with my D7000 running the latest patch. 18mbps vs 64mbps. Top two rows are straight out of camera, bottom two with some slight grading adjustments.
Attachments
D7000 bitrate comparison.jpg
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