PhilVanKleur
New Member
I have an animation engine that runs in my web browser and animates cartoons. I've been making YouTube videos of these by using Display Capture in OBS, then cropping the resulting videos in Avidemux using its Crop Filter. But yesterday, I found out how to crop in OBS by using ALT-Drag. So I tried that instead, as it would save me time.
So I used OBS's ALT-Drag to resize the red box so it just fit round my animation, then recorded the result. When I'd uploaded it to YouTube and made it public, it was smaller than I'd expected, with big black spaces round the outside. In contrast, the Avidemux-cropped version had no such spaces. So why does cropping in OBS behave differently from cropping in Avidemux? More specifically, what information is YouTube using to decide the displayed width and height of uploaded videos, and why do the two cropping methods not deliver the same information to it?
The aspect ratio of the two recordings, and their absolute widths and heights, would have been roughly the same, depending on how I sized the page being recorded. However, it's unlikely that I made them exactly identical. Apart from that, I presume differences are down to however Avidemux re-encodes cropped videos when it saves files. But I don't know enough about video to see how that would matter to YouTube.
This is on version 26.0.2 of OBS under Windows 10. The log file is at https://obsproject.com/logs/nC6FrsFMJ23DqOYX . My base and output settings were both 1920 by 1080. I realise that answers to this may be best guesses, as they may well require more information about Avidemux and YouTube than I can give. But it would be good to know some general principles of video that I can think about this with.
So I used OBS's ALT-Drag to resize the red box so it just fit round my animation, then recorded the result. When I'd uploaded it to YouTube and made it public, it was smaller than I'd expected, with big black spaces round the outside. In contrast, the Avidemux-cropped version had no such spaces. So why does cropping in OBS behave differently from cropping in Avidemux? More specifically, what information is YouTube using to decide the displayed width and height of uploaded videos, and why do the two cropping methods not deliver the same information to it?
The aspect ratio of the two recordings, and their absolute widths and heights, would have been roughly the same, depending on how I sized the page being recorded. However, it's unlikely that I made them exactly identical. Apart from that, I presume differences are down to however Avidemux re-encodes cropped videos when it saves files. But I don't know enough about video to see how that would matter to YouTube.
This is on version 26.0.2 of OBS under Windows 10. The log file is at https://obsproject.com/logs/nC6FrsFMJ23DqOYX . My base and output settings were both 1920 by 1080. I realise that answers to this may be best guesses, as they may well require more information about Avidemux and YouTube than I can give. But it would be good to know some general principles of video that I can think about this with.