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

[Marton Balint]

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.

Thanks,
Marton