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23min video for internet under 100mb?

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Magnus Monfeldt
23min video for internet under 100mb?
on Nov 10, 2012 at 2:32:33 pm

Hi everybody,

I want to to export a small, yet sharp h.264 qt to be streamed from a blog. With 23min of video I know it's gonna be near impossible to meet the clients wish to have a crisp video AND to meet the blog requirements of max 100mb/appr 320x266px dimensions.

The material was originally HDV then converted into Prores 422. I have exported following Ken Stone's suggestions and yes, I've been fiddling with different frame and data rates. When I changed the export data rate from 3000 to 2000 it made quite a difference in bit rate and file size. But somehow the bit rate and file size barely goes down after decreasing data rate from 2000 to 750kbits/s. Am I getting something wrong here?

My last export which resulted in a 356mb file was:
400x225px
15 frames p/sec
Restrict to 750kbits/s

Is there a way around this dilemma?

Thanks in advance,
Magnus

FCP 7.0.3, 15" MacBook Pro 2.4 GHz Intel Core i5, 4 gb RAM


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Rafael Amador
Re: 23min video for internet under 100mb?
on Nov 10, 2012 at 3:11:12 pm

[Magnus Monfeldt] "400x225px"
Horrible number for compression.
You can't use numbers that are not divisible by 4.

[Magnus Monfeldt] "max 100mb/appr "
I guess you mean 100MB.

100MB for 23 minutes film, means that you can allow a bit more than 4MB per minute of film.
That means 4 x 8.000.000 bits per minute, 32.000 bits per 60 seconds, which is the same than 533.333'333 bits per second, or 533Kbps.
If you discount the audio data rate, lets say 96Kbps, you can set 437Kbps for the picture without reaching the 100MB file limit.
That that data rate for such a small video size will yield a very, very good picture.

But:
- Make the size 320x180, because that's real 16x9. You can go to 400x224 (no x225) and the picture still will look very good.
- leave the original time-base: 25fps or 30fps. No need to reduce to 15fps.
- Make Multi-pass, and set KEY-FRAMES AUTO.
If you need better audio, increase the audio data rate and reduce the video data rate by the same amount.
rafael

http://www.nagavideo.com


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reid vanvoris
Re: 23min video for internet under 100mb?
on Nov 10, 2012 at 3:15:57 pm

Follow these guidelines from Vimeo and simply reset the pixel aspect ratio to your required specs (320x266).

http://tinyurl.com/9c4pf7

I'm not sure why they are restricting you to 320x266. Following the Vimeo guidelines should allow you to get your movie under 100MB, even at 1280x720 and full frame rate.


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Magnus Monfeldt
Re: 23min video for internet under 100mb?
on Nov 12, 2012 at 6:57:54 pm

Rafael & Reid,

Thanks for your swift replies. However, none of the suggestions generated a video smaller than 100mb; Rafaels suggestion on lowering the data rate gave me a blurry 310mb file and following Vimeo's instructions (and Reid's) gave me an ultra-crisp 425mb file at 1280x720.

The blog designer came back and said we'll link to Vimeo instead, so it's all good.

/Magnus


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Rafael Amador
Re: 23min video for internet under 100mb?
on Nov 13, 2012 at 1:21:37 am

[Magnus Monfeldt] "However, none of the suggestions generated a video smaller than 100mb; Rafaels suggestion on lowering the data rate gave me a blurry 310mb file "
Obviously you haven't fallowed my instructions.
(437K x 60 x 23)/8 = 75.382K = 75MB.
That's the video size for the specs I gave you, and with that data-rate you get an MEGA-CRISP video at the requested size.
rafael

http://www.nagavideo.com


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reid vanvoris
Re: 23min video for internet under 100mb?
on Nov 13, 2012 at 9:20:55 pm

Thanks for your kind reply. If you have used 320x266, as you stated in your original post, you might've made it under 100MB. Also, if you used a 2000mbps data rate instead of 5000, you might've made it at 1280x720, not that it matters now. Best of luck with your project and again, thanks for the tip of teh hat.


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Magnus Monfeldt
Re: 23min video for internet under 100mb?
on Nov 14, 2012 at 10:05:57 am

Hi Rafael,

I actually made it 320x180. Perhaps it's the Linear PCM (not AAC) that caused the size to remain the same. Total bit rate is 1798 and I restricted data rate in export to 437, like suggested.

Again, I appreciate how quickly people come to the rescue over here.

/Magnus


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Michael Gissing
Re: 23min video for internet under 100mb?
on Nov 14, 2012 at 10:46:38 am

PCM audio is uncompressed. Stereo 23 minutes of audio is around 300 Meg depending on bit depth. AAC is data compressed.


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