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questions about video sizes and resolutions
I’ve been thinking about making some screen recording videos and I wonder what might be an optimum size. I read, for example, that screen recordings are captured at 60 frames/second. Isn’t that overkill? Wouldn’t 30 be all you need?
Also what about pixel dimensions? and also what video compression is best?
I’m hoping to keep my files small so they don’t take up too much storage space but still look okay. So if anybody has any good rules of thumb for this I’d greatly appreciate it.
Comments
Which screen? The iPads? And stuff to you want to record? And where do you want to watch the recordings? All this questions influence the answer.
But some general considerations
. Movies are usually shot at 24 frames, but that is mostly a legacy from back in the day film was expensive. People got used to it, so we keep doing them. That said, if there are fast moving things, 60 fps will be much better. Sports are one obvious area that benefits, but so do computer interface recording, like, say, AUM sessions where you move sliders and knobs.
Its much easier to rescale a video that got to big in size, than to do the opposite, since you can’t really increase the video resolution without guessing and making up information. So… always record on the maximum resolution possible, and resample to an appropriate size before archiving. Maybe the maximum resolution is not so big after all, but you only know after the fact.
As for formats, keep in mind where you want to watch the videos… stream online? Watch on your living room tv? Etc…
There are better formats purely from an archival point of view, because they will be lossless, but of course that also increases their size. Also from a lossy perspective there may also be better. But I would suggest these days h264 is still very much ok, versatile and 99% of devices with a screen manufactured in the last 15 years will read it without issues.
So for now, h264 @ 60fps, either FHD or 4k depending a bit on your storage capabilities, would be my versatile, convenient and somewhat future proof answer. And we haven’t even talked audio coded and container formats.
If you could be more specific on your goals, maybe you will get more accurate answers.
Thanks for your detailed answer which highlights some of the complexity that always bogs me down when I try to plan something.
I really just want to make some simple videos for use here on the forum. To show a process or whatever. So for watching on an iPad, etc
Wouldn’t a 60 frame/sec vid be twice the size of a 30 f/s?
What’s a good pixel width? I’m going for simple here.
Are you recording the iPad screen and sound, or some other device? If only the iPad, there is a simple answer.
As for simple, it does not get much more simple than what I told you. FHD or 1920x1080 will be good enough for 99% of the use cases.
As for your question about the doubling the frame rate, that is from 30fps to 60fps will also double the file size, sometimes but not really. Because you would possible use VBR or variable bit rate, which could actually mean a similar file size at 30 or 60 depending on how much of the screen actually changes during the video. That said, this is a somewhat complex topic and you want to keep it simple.
You're not going to be able to upload videos directly to the forum anyway, so the easiest approach is just to do whatever is easiest to upload to YouTube so that you can post a link to it here. Let YouTube worry about the resolution and frame rate. Delete the originals from your device once uploaded. You really don't need to keep them locally unless they're important to you for posterity.
Are you going to be editing these videos, or just maybe taking screen recordings?
Thanks - I understand I'd be uploading to youtube or vimeo. So, they automatically compress the videos for their own standards?
But another reason, aside from local storage, is that if I can make my video smaller first, then the upload time would be quicker - right? I was recently uploading a 3-4 minute test video to Vimeo and it took a long time. Upload speeds are always slower anyway.
I'm planning to do some simple editing first; just to cut out dead space. No big productions. 👨🏻🎨 🎥
Fwiw, the higher the quality you upload, the better the quality of the video will be after it they re-encode if. If you try to save space on your video by reducing size, frame rate and quality before uploading, it will impact the quality your viewers see. What gets delivered will be
lower quality than what you upload.
I was messing around with uploading some of my mother-in-law's old Sony Handycam videos captured to my Mac awhile ago. After some messing around and guesswork, I went with the 720p export to file option from iMovie on the Mac. Youtube just upsized them (with poor quality) if I went lower resolution than that.
I've got great internet speed so size isn't something I've given a lot of consideration to. I was putting a hard copy on a USB disk for her as well, so I at first was trying to get to a lower resolution to match the capture resolution. But when I found Youtube applied crappy upsizing, I opted to upsize them at better quality myself.
Sorry, not much help for your use-case. I didn't give it a lot of thought.
This is definitely true. The videos looked terrible when Youtube did the upsizing.