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Add RFC: Interlaced output

Open mufunyo opened this issue 4 years ago • 5 comments

Description

Add the ability for OBS to output interlaced video.

Motivation and Context

TV broadcast is often interlaced, and Decklink cards offer the ability to output interlaced signals, but due to a limitation in OBS' output design, Decklink interlaced output is reduced to half frame rate progressive in an interlaced signal (i.e. 30p in 60i).

Link

https://github.com/mufunyo/obs-rfcs/blob/interlaced-output/accepted/0013-interlaced-output.md

mufunyo avatar Mar 05 '20 21:03 mufunyo

Hm, so is this specifically for the decklink output, or for recording as well?

jp9000 avatar Apr 20 '20 22:04 jp9000

Decklink, recording, and streaming, yes. Should also be good for SRT streaming.

mufunyo avatar Apr 21 '20 14:04 mufunyo

+1 for this - working in esports and in talks with TV companies, 1080i50 is the format they're looking for. I think vMix may have this functionality, but it'd be great if OBS did.

GrandyB avatar Apr 28 '20 12:04 GrandyB

+1 for this - working in esports and in talks with TV companies, 1080i50 is the format they're looking for. I think vMix may have this functionality, but it'd be great if OBS did.

It may be too long for you to wait for this RFC to be approved and fulfilled, so I would recommend using OBS Decklink output to produce a compliant 1080p50 output, and then daisy chaining in a scan converter (Blackmagic has affordable models) to bring it down to 1080i50 for broadcast. If you want to discuss further options we shouldn't clutter this RFC - you can find me in the OBS Discord.

mufunyo avatar Apr 28 '20 12:04 mufunyo

I know it's been a few years since the last activity on this thread. I hate to be a downer, but I'm not sure what reasonable justification there would be behind adding an interlaced mode at this point. Interlaced content is arguably going away gradually. To me, it would almost be cruel to implement this so late in its lifetime. Scan converters are also definitely much more accessible. I think the MD-HX supports p->i conversion.

tt2468 avatar Jun 01 '22 07:06 tt2468

While we understand that this might be useful for some edge cases or specific communities, we also feel that there are other tools and solutions that accomplish this, and the added support and maintenance cost for this is not worth it for us.

Moving to Final Comment Period, with Disposition Close

Fenrirthviti avatar May 04 '23 19:05 Fenrirthviti