[FFmpeg-devel] [PATCH] avdevice/decklink: adjust for timecode lag

[Marton Balint]

On Tue, 20 Aug 2019, Devin Heitmueller wrote:

>> A couple of follow-up Qs:
>>
>> Is auto-detection available for all Decklink devices?
>
> No, but AFAIK it is for all devices which support SDI.  Generally it's
> the older analog capture devices which don't support it.
>
>> For those for which it is available, are there any edge cases in which
>> it sets inaccurate mode?
>
> I don't trust the existing detection code enough to use it in
> production.  It often fails to detect and thus ffmpeg will exit at
> startup.

Can this be fixed by simply increasing the timeout from 1 sec to 2 
seconds?

> Also, there are cases where it will misdetect 1080i59 as
> 1080p30 depending on the card.  It's been on my TODO list for a while
> to make that code more robust (I believe I know what most of the
> issues are), but it hasn't been critical for any of my use cases.

Hmm, interesting... When you say the issue is card-dependant, does this 
mean card _model_ dependant or that the issue can affect one card and not 
the other with of the same model/fw?

Thanks,
Marton