On 17-08-2019 09:21 PM, Marton Balint wrote:
On Sat, 17 Aug 2019, Gyan wrote:
On 17-08-2019 08:42 PM, Marton Balint wrote:
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?
So, were you able to reproduce the issue _with_ format_code specified?
I was able to reproduce the part where after starting the capture the
decklink device records empty frames (with flag
bmdFrameHasNoInputSource set) for a couple of frames.
I was not able to reproduce the part where the timecode was earlier or
later available then the first frame of the useful video signal.
Ok, thanks. I'll get back when I have more info.
Gyan
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