Normally when a bitrate calculator is used it assumes that the video is full D1 resolution. In theory I should be able to use half D1 and half the bitrate, right?
Is there a calculator that also asks for the input and/or output resolution?
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Bitrate is completely independent of resolution. It's only a function of filesize and length of video. The answer to your question is no, since resolution has nothing to do with it.
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Originally Posted by manono
I can fit more video on a DVD when I scale back the resolution to half-D1 (352x480), which works fine for DISH Network PVR captures (native capture resolution for DISH Network PVR and TiVo captures is 480x480, so scaling up to full-D1 resolution doesn't gain me anything, while scaling DOWN to half-D1 doesn't lose much, and allows me to put more on a DVD).
Sounds to me like FitCD is what stantheman1976 is looking for:
https://www.videohelp.com/tools?tool=FitCD -
Originally Posted by jbodin
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Originally Posted by jagabo
http://www.doom9.org/index.html?/bitrate_guide.htm -
No, you're wrong.
Resolution determines depth of detail. Of course, source has to have the same detail.
Bitrate determines filesize.
The allocation of bitrate to resolution determines image quality.
Resolution and image quality have zero bearing on filesize.Want my help? Ask here! (not via PM!)
FAQs: Best Blank Discs • Best TBCs • Best VCRs for capture • Restore VHS -
Originally Posted by jbodin
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Huh. Interesting stuff, guys -- I'm going to have to look at what I've been doing lately to figure out what's going on. I've been using gui4ffmpeg to do some conversions for me, and using a given bitrate (5000), I find that the output file size varies depending on the resolution selected. I've been using this to convert video captures from my DISH Network PVR to half-D1 resolution DVD-compliant MPEG files.
Weird. Thanks for setting me straight on this -- now I've just got to figure out why I get different file sizes based on the selected resolution when I've been doing the conversions. -
the only other variables I can think of are:
1. whether or not you are using constant or variable bitrate.
2. If the audio format/bitrate is different between the videos.
3. The program is going behind your back and changing things for you. -
Thanks for the heads-up on this, guys -- I think I figured out what's going on . . . this is from the gui4ffmpeg help file:
What's happend if the video bitrate was decreased but
quality and file size are unchanged?
If the source file contains not so much information (cartoon,
low motion, ...), the selected bitrate will not reached. Have a
look in ffmpeg's DOS box at the actual bitrate while encoding.
Good to know. Thanks!
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Originally Posted by jbodin
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I have noticed that the indicated bitrate in ffmpeg's DOS box doesn't reflect the selected bitrate that I've been dialing-in...
It's called saturating the codec. It's using all the bits it can for the source and the settings you have. It's giving you the best quality it can for your settings. It's also an indication (in my opinion) that you're setting it up wrong, as you could have used a smaller file size, a larger resolution, a better quantization matrix, a good AviSynth sharpener, or made some other changes, and still have had virtually the same (or even better) quality. -
Originally Posted by jagabo
https://www.videohelp.com/forum/archive/t300220.html
Originally Posted by daamon -
Originally Posted by jbodin
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