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HD Noob: Confused about Deinterlacing
Hello,
I have lurked and received much wisdom from these forums, but now I’m stuck and confused.
I have recorded Wedding footage from a HDV Sony camera in 1080-50i (that’s what Sony Vegas tells me), and I’m about to output(& down convert) this footage on DVD as SD, but I also want to provide a HD file of the footage. The person I’m giving this to has a HDTV, he will be playing the DVD on his DVD player, but he will be playing the HD file via his laptop hooked up to his HDTV.
So; a) Will I need to do anything like deinterlacing for the DVD output?
b) For the HD file which he will be playing via laptop, do I need to deinterlace that?I appreciate any advice!
Phil
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19 Replies
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Hi Phil,
The key is to think about the source device. If it’s an HDTV, it doesn’t matter if he is playing it from a DVD, playing it from a laptop, or streaming it from his media server… the HDTV understands interlaced video and will display it properly. There is no need to deinterlace.
The only time you would worry about deinterlacing is if he was playing it on his laptop LCD which is progressive but since he’s hooking the laptop to an HDTV you have no worries about interlacing.
What you might worry about is can his laptop play full HD quality at full frame rate? It might not. In which case you might want to give him a 720p version for his laptop. Laptops are NOT good HD playback devices. He should seriously consider getting an HD media server or Blu-ray player.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Thanks so very much John for clearing that up.
I guess my confusion comes from reading the wiki on deinterlacing, where it said “…interlace artifacts or combing occur … This is true for most modern LCD and plasma displays, because they are currently not able to work in interlaced mode.” but then later it would say “all LCD and plasma consumer television sets have built-in circuitry that converts interlaced video”
My head exploded trying to find a straight answer. I will take your advice and convert it to 720p, as he will not be getting a HD media server or bluray player.
Thanks again for the info! Appreciate it.
Phil
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I know it’s confusing but read these two statements carefully:
> “This is true for most modern LCD and plasma displays, because they are currently not able to work in interlaced mode.”
The operative word there is “displays” as in PC display. The physical LCD or plasma display is progressive and when used with a PC the entire pipeline is progressive.
> “all LCD and plasma consumer television sets have built-in circuitry that converts interlaced video”
Here the operative words are “television sets“. One statement is taking about computer displays and the other is talking about TV’s. The confusion is because they both use LCD or plasma technology but TV’s include a circuit that deals with the interlaced video while PC’s do not.
> I will take your advice and convert it to 720p, as he will not be getting a HD media server or bluray player.
You might want to give him a 5 minute sample video in HD 1080i and see if his laptop can play it back smoothly. If it can, you’re all set. If not, give him a 720p version.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
John, interlacing confuses me too. If you are going to watch it on a projector fed from a laptop do you need to deinterlace? What if you are watching from a projector froma WDHD device?
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It depends on the projector and the inputs that you use. If the projector is expecting input from a computer, then you will have to deinterlace because the projector is expecting the computer to send progressive video. For the WDHD device, it depends on how it’s feeding the projector. Normally the WDHD hooks up to a TV via HDMI or S-Video or Composite, etc. Going into those inputs on a projector, the projector might actually deinterlace for you.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
As I understand, LCD and Plasma TV’s understand de-interlaced video. Only problem is for computer displays. So, I would suppose it is better to de-interlace 50i video always anyway? On the other hand some people on internet forums give the advice to rather not do it. So, what’s the best procedure if I shoot 50i video?
Dirk
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How do you plan to deliver the video to the LCD TV? That will determine the best way to render. If you are using some device that’s going to send a file directly to the TV then you could deinterlace it but why bother? The displays have hardware deinterlacers built in. I would only deinterlace if I was delivering to the web or a PC.
~jr
http://www.johnrofrano.com
http://www.vasst.com -
The intention is to deliver HD(home)video to TV through a mediaplayer (or a blu ray player). I use Vegas and Neoscene. Considering the advice not to deinterlace, my question mainly comes down to the following: why do Neoscene and Vegas both offer the option to deinterlace if any HD TV has a deinterlacer built in anyway? Do vegas or Neoscene do a better job, or do they just have the option as such?
Dirk
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> The intention is to deliver HD(home)video to TV through a mediaplayer (or a blu ray player).
These are very different devices but both should handle interlaced footage just fine. Probably the best format to be compatible with both is AVCHD.
> why do Neoscene and Vegas both offer the option to deinterlace if any HD TV has a deinterlacer built in anyway?
Because the Internet is not a TV… and iPods, Zunes, and PSP’s are not TV’s. 😉 If your target audience is the web or a hand-held device then you need to deinterlace because computers monitors and media player monitors are not interlaced devices. If your target device is a TV then you should interlace because that it what these devices expect. It’s a hold over from days gone by but it is still a requirement for backward compatibility reasons.
You can certainly send deinterlaced footage to an HD TV. Each will deal with it in it’s own special way (e.g., some will display it and others will reinterlace it before displaying it… it depends on the TV)
~jr
http://www.johnrofrano.com
http://www.vasst.com -
Hi,
So I have a Sony Bravia 1080P LCD tv. If I have an input (say, directv) and it sends a 1080i signal to my tv, will the TV de-interlace the 1080i signal to a 1080p?I’m kind of a noob at this stuff.
Thanks
Adrian
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