On Wed, 14 Aug 2019, Marton Balint wrote:
On Wed, 14 Aug 2019, Gyan wrote:
On 09-08-2019 04:59 PM, Ilinca Tudose wrote:
Hi Marton,
The issue with the out of sync TC was reproducible on all tapes and decks
that we tested. I don't have the exact number now, but a few dozens, less
than 100. They all had between 7 and 17 frames out of sync. We were not
able to obtain anything more in sync than 7 frames.
The TC sync was tested by setting up the deck to "burn" the TC with the
image while capturing the content with TC through ffmpeg. We then play the
file in a player that supports timecodes and compare the burned-in TC with
the one captured in the metadata.
We used Decklink quad 2 and several Sony decks: J30, J3, JH3. We tested on
multiple decks from each model and confirmed the issue was present + that
Gyan's patch seemed to fix it. We have used several types of Betacam tapes
and HDCAM tapes. I can not comment on whether this is the best solution,
but can confirm it works.
Let me know if you need more info.
Thanks,
ilinca
Ping.
Sorry, I need a bit more time to investigate.
OK, I did a couple of tests myself for HD and SD pal signals, and it seems
to me if signal autodetection is used, so no format_code is specified
then timecode is readily available in the first frame. I was using
BlackMagic SDK 11.1 for testing by the way. Can you confirm the same
behaviour with your setup?
Because that would make the patch uneeded I believe.
Thanks,
Marton
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