24 FPS with Higher Visual Quality or 30 FPS with Lower VQ?

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24 FPS with Higher Visual Quality or 30 FPS with Lower VQ?

Postby wwf_htm » Mon Sep 22, 2003 10:15 am

I want to encode my video for release but I am undecided on whether to make the video (which is originally 29.97 fps) 23.976 frames per second with an increased bitrate or putting it at 29.97 fps and lowering the bitrate. Which would most people prefer?

Thanks you for your input

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Postby NicholasDWolfwood » Mon Sep 22, 2003 12:08 pm

The framerate of a video file doesn't have to do with the bitrate it's at, so what the hell does it matter?
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Postby Zarxrax » Mon Sep 22, 2003 12:44 pm

If your video is truely 29.97 fps then you should leave it at that, as reducing the framerate will make it choppy. However, if the video is originally 23.976 fps (which it most likely is) you are better off doing IVTC to convert it to 23.976fps. And as Nicholas said, this has nothing to do with bitrate.
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Postby Tab. » Mon Sep 22, 2003 3:52 pm

My ass it has nothing to do with bitrate. Lower framerate = less bits spent = lower bitrate for same visual quality.
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Postby Zarxrax » Mon Sep 22, 2003 4:49 pm

Well, the way *I* interpretted his post, was that he was aiming for a certain filesize rather than a certain quality, and that changing the framerate would somehow effect the bitrate he should use to achieve that size. This is actually how a lot of people think, believe it or not. It's all in the way you choose to interpret what he's said.
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Postby Tab. » Mon Sep 22, 2003 4:50 pm

Zarxrax wrote:It's all in the way you choose to interpret what he's said.


OH GOD ITS THE RELIGION THRAED ALL OVER AGAIN
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Postby wwf_htm » Mon Sep 22, 2003 11:08 pm

ok. let me clarify what i was trying to say. say i encode a video at 29.97 fps and it ends up being 50 megs. i want to know if people would prefer the 29.97 fps 50 meg encode or a 50 meg video encoded at 23.976 fps with an upped bitrate so that the quality is better.

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Postby Zarxrax » Mon Sep 22, 2003 11:42 pm

See what I mean Tab? :wink:

wwf_htm: my first post still stands. What you need to do is figure out what the correct framerate for your video is, and use that. The guides should be helpful.
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Postby Knowname » Tue Sep 23, 2003 4:55 pm

wwf_htm wrote:ok. let me clarify what i was trying to say. say i encode a video at 29.97 fps and it ends up being 50 megs. i want to know if people would prefer the 29.97 fps 50 meg encode or a 50 meg video encoded at 23.976 fps with an upped bitrate so that the quality is better.

htm


right on, I knew you meant that, I have a way with scrambled minds. Besides I think the point is to think of this guys goal, it was OBVIOUSLY to get a certain size not to find some nerdy formula that equates the relation of bits and frame rate... that's the problem with AD and Ermac's guide too.

But I can't beleive I'm with Tab on this one, considering how both our alter-egos bickered on that religion thread... and I can't believe he remembers that thread either ^.^ (less it poped up in the passed few days... really surprised it wasn't locked emediately for the same reason the "say something nice about the person before you" thread was).
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Postby Tab. » Tue Sep 23, 2003 5:01 pm

we argued in a religion thread? Hmm. I probably didn't know what I was talking about seeing as it was long enough ago that I don't remember it. You might want to try here. It only starts on page 15, everything before it is just warped talking about gays.
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Postby Knowname » Tue Sep 23, 2003 5:23 pm

aah yes, it was a while back (wit radical ed0) /slips back into his memories.
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Postby SS5_Majin_Bebi » Tue Sep 23, 2003 7:47 pm

I made perfect sense of wwf's post. I'll break it down for the people who got him wrong.

1. He has a file.
2. He wants it to be a 50mb file.
3. He's wondering about the framerate vs quality issue.
4. At 29.97fps he's going to have to drop the bitrate to keep it at 50mb, compared to the bitrate he'd use if it was 23.976fps.

Basically, more frames to encode = higher filesize. If you lower the bitrate, the filesize will drop accordingly.
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Postby Zarxrax » Tue Sep 23, 2003 7:52 pm

But he WONT have to drop the bitrate to keep the size the same! The bitrate DIRECTLY effects the size of the file. If he has to set the bitrate to say, 1200kbps in order to get a 50mb file, it doesnt matter if he encodes at 29.97 fps, 23.976fps, or 120fps! They all require the same bitrate to achieve 50mb.
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Postby SS5_Majin_Bebi » Tue Sep 23, 2003 8:07 pm

Zarxrax wrote:But he WONT have to drop the bitrate to keep the size the same! The bitrate DIRECTLY effects the size of the file. If he has to set the bitrate to say, 1200kbps in order to get a 50mb file, it doesnt matter if he encodes at 29.97 fps, 23.976fps, or 120fps! They all require the same bitrate to achieve 50mb.


Oh.


Fuck, it does too.


Shit, now I feel stupid.

:oops: :oops: :oops:

Once again, SMB has made an ass of himself.
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Postby Scintilla » Thu Oct 02, 2003 10:17 am

Zarxrax wrote:But he WONT have to drop the bitrate to keep the size the same! The bitrate DIRECTLY effects the size of the file. If he has to set the bitrate to say, 1200kbps in order to get a 50mb file, it doesnt matter if he encodes at 29.97 fps, 23.976fps, or 120fps! They all require the same bitrate to achieve 50mb.

Okay, so the BITRATE is the same. But the QUALITY of each frame will be somewhat better in the 23.976 version, because there's fewer frames over which to spread those bits, right?
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