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export quality
SORRY if this is the wrong place _ I am exporting clips from FCP HD and didn’t see a forum specifically for streaming, so i am posting here. If this is incorrect, just point me in the better direction.
i have been transcoding content for years and thought i had a good idea how to get a decent clip online for people to view. However, all my footage is taking sometimes near ten minutes to download when the link is pressed.
the clips are:
240×180
15fps
Bitrate limited to 200k
Sorenson 3 (i wish i could use H.264 but having to download a codec to play the clip is asking a lot of users)
Medium quality
QUicktime files – offering real/windows is too expensive to hostthe clips are from 3 – 5 min. – which is kind of long, but i have seen 320×240 7 min. clips play just fine.
My clips are launched using a javascript command, to alleviate download times if the clips were embedded in the HTML page.
For an example: http://www.reginahammond.com/maltese.html
the clips on this page take forever to download.
Any suggestions??KickStand Productions
Sports Videography/Editing -
4 Replies
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Your 4 minute clips are around 60 megabytes! https://www.reginahammond.com/video/ Are you setting the data rate to 200 Kilobits (proper) or 200KB (kilobytes – whoa!). Cleaner works in kilobits. For DSL you can make a 500 kbit rate mov at 320×240 that instantly starts playinig and doesn’t ever stop. QT exports are referred to in KiloBytes. I can’t remember the exchange rate, but I think you should limit it to around 40 kiloBYTES. Maybe even less with yoru small frame size. FWIW, I’d increase the frame size to 320×240 for sure. Here’s directory of some of my QTs.
For a 4 minute video, like on your site, you should be looking at about 10megabytes. 6 times less than what you’ve got.
But hey, after it downloaded the 60megs, they really looked sharp! 🙂
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Sorry, the directory I meant to paste in… https://www.bretwilliams.com/nlediting/images/quicktimes/
They’re all sorensen 3 with mp3 audio track. 500kbit/sec, 15 fps.
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I will definitely check out the bits/bytes. I am used to working mostly in Media Cleaner, so I might have just buzzed through the settings like i would use in Cleaner. I have spent insane amount of hours rerendering these files and exporting them – and i am not getting paid! So it is very frustrating.
KickStand Productions
Sports Videography/Editing -
I’ve been there. I used qt to output something once when I was used to cleaner. So when QT uses bytes (8 bits to a byte, base 8 math carry the 1, etc.) I think it’s basically 8 times the rate. So if you’re used to 200kb (pretty low really) then I think it’d be around 30KB. There’s something to the upper and lower case. I think bytes is upper and bits is lower. But the problem is nobody seems to conform, so it doesn’t really matter.
Look at it this way, uncompressed video is 600KB a FRAME. So multiply that by 30 to get the KB/sec. 18000KB/sec at 30fps, 9000KB at 15fps. And that’s uncompressed! Let’s take it down to DVCam, 5:1. That’d be 1800KB/sec at 15fps. Now shrink the frame size to 320×240 which is 1/4 the size and you’ve got 450KB/sec data rate.
So that’s roughly double the rate you were using. You were only using half of the data rate of a full on DV broadcast quality signal which is 450KB/sec at 15fps and 320×240 size. Let’s not forget your frame size was actually smaller too.
Obviously the goal is to use an extremely compressed version, not a full quality qt for the web.
Wow, that was some fun math. I wonder if any of it was even close to right. 🙂
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