[FFmpeg-user] Detecting signal change on Decklink devices

Reuben Martin reuben.m at gmail.com
Mon Sep 10 04:47:40 EEST 2018

On Sunday, September 9, 2018 5:53:03 PM CDT Chris Bisset wrote:
> Is there a better method of detecting a signal change? I do not need ffmpeg
> to gracefully handle it (I am OK with stopping and restarting when this
> happens), but I do need a way to catch when a different input is plugged in.

The assumption made with video signal capture is that the format will remain 
consistent and unbroken. This is the reason it generates color bars when input 
signal is changed, to retain continuity. (Though if there is a dropped frame 
then that is not working very well). There is really no way (via ffmpeg) to 
deal with that, it’s just not within the scope of what it’s designed to do. 
You might poke around in the SDK and see if there is a way you register a 
callback to provide notification when the input changes, and then use that as 
a mechanism to restart the ffmpeg process.


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