If I were to go the route of exporting/printing a graphic directly from Dorico, it gives me a choice of dpi resolution for PNG and TIFF. Would setting that to a specific setting help?
Meanwhile, I will try setting my screen to a specific resolution and grabbing a screenshot for there, as several have suggested, to see if that works.
I think a standard setting for DPI on screens is 72, but Someone more knowledgeable should correct me.
72 DPI computer screen resolution is ancient history. That was a āstandardā invented by Apple back in the 1980s for their 9-inch (yes, 9, not 19) monitor displays, so that the screen resolution was exactly half of their āhigh resolutionā dot matrix printers which printed 144 DPI.
Nobody except Apple ever took any notice of this. Early versions of Windows assumed the screen resolution would be 96 DPI.
Modern screens which are not āhigh resolutionā are typically somewhere between 96 and 120 DPI. For example a 1920x1080 display has (approximately) 2203 pixels along the diagonal, so a 23 inch screen (also measured along the diagonal) has 96 pixels per inch.
To avoid the aliasing problems, the important number is the number of pixels in the image, not the physical size of the monitor.
Note, 72 PostScript points per inch is a standard unit of measurement, but points and pixels are not the same thing either on screen or when printing.
What works for me is to export each page/screen as an individual PDF, then converting those to high-res, low-compression JPGs in another program. On Mac this can be done in Preview, Iām afraid Iām not familiar with a Windows equivalent. Then I use the aforementioned Davinci Resolve to assemble the video from those JPGs. Thereās a bit of calculation involved as well between the page size in Dorico and the DPI setting of the JPG export to make sure that the final images have a resolution thatās a whole multiple of 1080p, so the final downsampling is as clear as possible.
To be fair, there was a lot of struggling before I found out that this worked.
I like the workflow!
I think Leo posted somewhere a possibility to calculate Layout-Sizes for different pixel resolutions online with different DPIs (which you need because Dorico calculates physical sizes for layouts). Maybe it is then the easiest to just create a 1080p Layout?
I am surely going soon through this, so everything here is really valuable to me too. And sorry for the ancient DPI number 
Yes, I format the scores specifically for video purposes. Page size 320x180 mm, small margins. When exporting the PDFs to JPG, you can then choose 60 px/cm for 1080p, 120 px/cm for 4K or 240 for 8K, to be downsampled later of course.
(You can do a similar calculation in inches, this is left as an exercise for the American reader.)
I found this useful:
How Dorico makes creating score following videos a breeze
There is clearly something going awry with your process, because thereās no reason things should render so poorly. As mentioned above, the culprit has to be one of the following:
As Dan said, importing a 1080p graphic into a 1080p timeline, leaving its scaling at 100% (ie- not messing with the image at all, or stretching itās dimensions in any way) and then exporting at 1080 should give you aā¦ 1080p image. Now, the export process could introduce a few artifacts or soften edges a little bit, but nothing substantial or worrisome when all is working as it should.
One good rule of thumb is actually to work on a timeline that is MORE than you need, and then export down. So work on a 4k timeline, and then export at 2k or 1440, for instance. Then you have the luxury of discarding unnecessary detail, rather than opining that it is not there to begin with. This is a trick many YouTubers use; they film in 4k, even if they upload in lower resolution. That way the data is all there, and their videos can be punched in and are still super sharp without loss of quality.
All of that said, something screwy seems to be going on here, or there is some user error that you just havenāt caught yet. Take this from someone who has a YT channel with just shy of 500 animated score videos.
@Romanos
Not sure exactly who you are responding here, since my initial request was two years ago. Nevertheless, I appreciate your sharing your expertise. Needless to say, I had to find a solution two years ago and finally went with a screen capture running a playback of Dorico (complete with green progress bar) and capturing everything in 4K.
One thing I have found is that YouTube sometimes opens even 4K files in a lower resolution that I need to change manually. Not sure whether that was affecting my view two years ago.
At any rate, thank you for your wisdom. Next time I need to post a score video, I may well try your method rather than what I used last time.
I fell into the classic trap of the new forum! John posted 5h ago, and I didnāt realize that he was responding to a 3 year old thread! Whoopsie daisyā¦
I know the feeling.