VANC data in PAL been corrupted.

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max_verem

  • Posts: 11
  • Joined: Tue Nov 05, 2013 3:10 pm

VANC data in PAL been corrupted.

PostSun Jan 22, 2017 3:16 pm

Hi,

VANC data been sent in PAL mode been corrupted. decklink for unknown reason invert third LSB.

corrupted VANC dump in PAL:

Image

same data been sent in 1080i50 mode:

Image

original data in v210 been sent is:
Code: Select all
const uint8_t afd_210[48] = {0x00, 0x00, 0x00, 0x00, 0xFF, 0x03, 0xF0, 0x3F, 0x00, 0x04, 0x09, 0x00, 0x05, 0x02, 0x80, 0x10, 0x00, 0x10, 0x09, 0x00, 0x00, 0x02, 0x00, 0x20, 0x00, 0x00, 0x08, 0x00, 0x00, 0x02, 0x00, 0x20, 0x00, 0x00, 0x08, 0x00, 0x00, 0x02, 0x20, 0x19, 0x00, 0x00, 0x01, 0x00, 0x40, 0x00, 0x00, 0x04};
that represents VANC sequence:
Code: Select all
const uint16_t afd_seq[15] = {0x0000, 0x03FF, 0x03FF, 0x0241, 0x0205, 0x0108, 0x0244, 0x0200, 0x0200, 0x0200, 0x0200, 0x0200, 0x0200, 0x0200, 0x0192};


VANC created in 10-bits:
Code: Select all
m_deckLinkOutput->CreateAncillaryData(bmdFormat10BitYUV, &vanc);
and frame been created in 10-bit.

i am using Decklink DOU under Linux with 10.8.4a4 driver version
Code: Select all
blackmagic: Loading driver (version: 10.8.4a4)
Is it correct behavior or wrong workaround for 8-bit VANC data?
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max_verem

  • Posts: 11
  • Joined: Tue Nov 05, 2013 3:10 pm

Re: VANC data in PAL been corrupted.

PostSun Jan 22, 2017 4:01 pm

VANC data been sent in PAL mode been corrupted. decklink for unknown reason invert third LSB.
i inverted source bit, but result is still the same - it seems data in this bit is a parity calculated by board.

may be is ok for 8-bit data, but for 10-bit data that should not happens.
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parithi

  • Posts: 5
  • Joined: Tue Feb 13, 2018 7:05 am
  • Real Name: Elamparithi Shanmugam

Re: VANC data in PAL been corrupted.

PostTue Feb 13, 2018 7:13 am

Did you get any update from BMD?

I am also facing same issue. I can able send VANC out in 1080 display modes, but not in NTSC and PAL mode.
Regards,
Parithi

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