[FFmpeg-devel] [PATCH] avdevice/decklink_dec: Extract 1080i and NTSC VANC

Devin Heitmueller dheitmueller at ltnglobal.com
Tue Jan 23 16:07:16 EET 2018

Hi Ray,

> On Jan 22, 2018, at 11:20 PM, Ray Tiley <raytiley at gmail.com> wrote:
> I'm reading 334-1:2017 Sec 4
> "When the ANC packets defined in this standard are carried in a high
> definition signal, they shall be carried in the Y stream."
> I couldn't find anywhere in the document where it calls out standard
> definition

Right, so my understanding was that allowing the ability to use both luma and chroma was a result of having less space in the VANC to hold data, compared to HD resolutions where that is much less likely to be an issue.  That said, I’ve never seen an implementation that actually puts it in the chroma.

> Conversation is here:
> https://video-dev.slack.com/archives/C0XKDDH5Y/p1516141555000074 <https://video-dev.slack.com/archives/C0XKDDH5Y/p1516141555000074> with
> kierank at obe.tv <mailto:kierank at obe.tv> who I believe is in the ffmpeg-devel IRC.

Ah, ok.  That’s Kieran.  He’s really knowledgable in this area, although I cannot see the conversation you’ve linked to as it seems that room is only accessible by people with email accounts from certain domains.


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