BtbN changed the topic of #ffmpeg to: Welcome to the FFmpeg USER support channel | Development channel: #ffmpeg-devel | Bug reports: https://ffmpeg.org/bugreports.html | Wiki: https://trac.ffmpeg.org/ | This channel is publically logged | FFmpeg 7.0 is released
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<noobaroo>
I've found that for some 1080p content using a lower CRF and downscaling to 720p gives better quality/bitrate than the same bitrate with a higher CRF at 1080p
<noobaroo>
Can someone explain the technical reasons behind this?
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<noobaroo>
Another weird phenomenon is a small picture of size 140x140, converted to 360x360 with ffmpeg will have a massively bigger file size. But it's not like any new pixel data has been added, its the same image, so why the file size increase?
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<noobaroo>
If you can please, spare some time to throw some 2 cents in here, I would greatly appreciate. not looking for a science whiz (but if I do get this then thats okay :)) just another's experience/interpretation of the matter
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<another|>
360x360 is more than six times the pixel count than 140x140
<noobaroo>
another| but they are the same pixels, just repeated
<another|>
Are they? Does it matter?
<noobaroo>
I don't know... That's why I'm asking
<another|>
You don't know what exactly?
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<noobaroo>
I know there are some filters like lavfi which are supposed to be somewhat like a really mediocre, baby AI upscale, but is normal scaling somehow different than just clicking and making the window bigger?
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<JEEB>
lol at that description
<JEEB>
like nnedi3 is no longer new, but calling it like that is kinda insulting given how much it got utilized
<another|>
I don't even. lavfi a filter... aha
<JEEB>
anyways, the main difference between pre-encode scaling and post-encode scaling in the general case is that latter means you're upscaling any possible compression artifacts. keeping the original size is generally preferred, but when dealing with Crappy Platforms like Youtube you might end up wanting to upscale just to have it break your source less.
<JEEB>
if you encode it so that you don't have visual artifacts even when resizing your player, then resizing your player of course is preferable
<BtbN>
Upscaling 1080p to 4K has real benefit when uploading to YT, given you don't trash the quality in the process
<BtbN>
Cause it allocated more bitrate to 4K, and upscaled 1080p needs a lot less of it to look good
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<acresearch>
people i need your help with this command: ffmpeg -i fish.insp -vf v360=dfisheye:equirect:ih_fov=202:iv_fov=202 -crf 0 -q:v 1 output.jpg it seems the ih_fov and iv_fov values are incorrect, how do i determine them? here is the output metadata of the fish.insp file: https://paste.debian.net/1315271/
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<acresearch>
people i am using the following command to convert a dual fish eye image into an equirectangular image: ffmpeg -i fish.insp -vf v360=dfisheye:equirect:ih_fov=200:iv_fov=200 -crf 0 -q:v 1 200.jpg but the problem is the ih_fov and iv_fov values are not optimal, how can i find the optimal values? here is the meta data of the image https://paste.debian.net/1315271/ , how can i derive these values?
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<BtbN>
they're parameters of the lense and how it was set up
<BtbN>
I doubt a camera would export those as exif
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