I’ve been doing some testing with sliding graphics in from the left and I’ve noticed that they are blurry while sliding in, I’m using Tumult Hype3 to generate HTML graphics.
If I set the channel to 1080i50 I get vertical tearing, if I use 1080p50 it all works fine.
Your correct thought I had checked that, I’m using OBS to capture with a Magewell - USB Capture SDI Gen 2.
I had set OBS to deinterlace but it appears that the capture card does it for me, which is set to blend top and bottom field, setting deinterlace to either top field only or bottom field only doesn’t show the issue, but surly using that would mean I’m missing half the frames?
If I capture directly from CasparCG as ProRes and play back in VLC with deinterlace turned on and set to blend I see the same as what I get with the capture card set to blend.
Blend is not a very high quality deinterlace method. It is likely offered as it is computationally cheap compared others. If you were to try the yadif method in vlc, I expect it would look correct.
but surly using that would mean I’m missing half the frames
Yes, that is correct.
It looks like you will need to do the deinterlacing in obs (with the yadif algorithm) instead of on the card. I know that some others here will be disappointed to know that the deinterlacing on Magewell cards is not very good.
If deinterlacing in obs/vlc you will wnat to set the magewell to ‘weave’ mode as that is deinterlacing disabled. When passing around interlaced video, it typically gets done in pairs of fields (which is why vlc reports it as 25fps) like that weave method describes. It is then just some metadata saying that it is interlaced.
I suggest you test taking the CCG input into OBS via NDI. You could even route the channel to a separate channel in 1080p50 that is only delivered over NDI to OBS.