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

[Gyan]

> On 28-07-2019 01:37 AM, Marton Balint wrote:
>>
>>
>> On Fri, 26 Jul 2019, Gyan wrote:
>>
>>>
>>> Patch supported by and tested at Google.
>>
>> Seems like a huge hack for a decklink issue... ;)
>>
>> I wonder if there are better approaches to work around this. Like 
>> dropping all frames until we have a valid signal.
>
> Let's say the scenario is like this,
>
> Frame #            TC                 Status
>      1                   no               dropped
>      2                   no               demuxed
>      3                   no               demuxed
>      4                   no               dropped
>      5          04:11:21:04       dropped
>      6          04:11:21:05       demuxed
>
>
> We don't want to drop frames before 6; they still should be digitized 
> (sometimes the TC appears after ~15 frames). But the stored TC needs 
> to be 04:11:21:04 + (2 - 5) =  04:11:21:01
>
>> How is this repoducible? do you have an exact model / signal type / 
>> TC source requirement?

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