On Mon, 16 May 2016, Dpto. Datos Television Costa Blanca wrote:
El 14/05/2016 a las 2:44, Marton Balint escribió:
I've removed -re from the command, but if that doesnt help, how can I
fix the desync? I have no way of "not having" the NO INPUT SIGNAL ->
INPUT SIGNAL DETECTED problem.
Also, when the signal interrupts I see in the stream the colour bars. Do
they come from ffmpeg or from the decklink card?
Bars are coming from ffmpeg, when no input is detected. Apparently
your inputs are not synchornized... Can you try to feed synchronized
signal to ffmpeg to rule out this, as a probable source of A-V desync?
The quick answer is no, I cant feed with sync. One of the sources is a
complex PC VGA to S-VIDEO to SDI (Yes, 3 converters, dont ask) and they
dont have sync in/out.
We have a blackmagic SDI to Analog A/V that works perfectly (Never get
desync), but with the quality loss of the Analog A/V so is a discarded
solution.
While Im looking on how to sync the inputs, is there any other way to
fix this? Maybe telling ffmpeg to ignore any time code and just encode
whatever get in?
The problem may well be that when the decklink card loses input, it
provides video frames only but no audio. I am afraid you have to dig into
the code, to figure out what is really going on. You can try to modify it
so it only adds a video frame to its packet queue if audioFrame is not
null.
You may also try using newer decklink drivers from blackmagic...
Regards,
Marton
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