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21st December 2011, 13:41 | #1 | Link |
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Bitrate calculator for h264
Hi, Its been years since i seriously havent encoded a video. Then back i used ar calculator to calculate the best bitrate according to my settings using xvid or divx. I know gordian knot but i believe its outdated? Whats the best program for doing this with x264? thank you
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21st December 2011, 14:30 | #2 | Link |
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That kind of bitrate calculation is considered obsolete nowadays. Instead you pick a CRF value and x264 will try to keep the quality constant while calculating the necessary bitrate itself.
Last edited by sneaker_ger; 21st December 2011 at 14:42. |
31st December 2011, 06:12 | #6 | Link |
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Sometimes you want to encode to a particular size, and no amount of saying CRF is
better is gonna change the requirements. I personally would like to see a bits per pixel option allowing the user to select his/her own requirement. I dont care if I've gotta do two pass, I want what I want, nuff said. Also, as good a CRF is (and I'm quite delighted with it most of the time), you want to hit a file size EXACTLY, and WITHOUT guessing what the output size might be +- 50%.
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31st December 2011, 06:36 | #7 | Link | |
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Quote:
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31st December 2011, 06:41 | #8 | Link |
HeartlessS Usurer
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Sorry, my own personal gripe, two seperate things really.
Bitrate calculator is good to ascertain if your requirements are met, But I also like (require) that I am allowed my own opinion of what is required, (right or wrong). EDIT: the main reason is, it does without the frameSize/framerate calculation.
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I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? Last edited by StainlessS; 31st December 2011 at 06:53. |
3rd January 2012, 23:19 | #9 | Link |
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Also, bits-per-pixel isn't a good metric at all, since the same video at a higher resolution needs fewer bits per pixel. My rule of thumb has always been to use the power of 0.75 ratio.
Thus, if 960x540 looks good at 2 Mbps with a given source, the same source at 1920x1080 would look similarly good at around (2x2)^0.75=2.83 * 2 Mbps = 5.66 Mbps. These days, I mainly use that to figure out the optimum frame size for different adaptive streaming bitrates. I generally like each bitrate to be about 50% higher than the next lower bitrate, so each step goes up 50% bitrate, 36% total pixels, and 16% in height and width. |
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