[FFmpeg-devel] [PATCH] libavdevice/decklink: enable 16 output channel

pkv.stream pkv.stream at gmail.com
Thu Aug 24 00:19:07 EEST 2017

Le 23/08/2017 à 10:32 PM, Matthias Hunstock a écrit :
> Am 23.08.2017 um 19:28 schrieb wm4:
>> What channel layouts do configurations with channels 9 to 16 use?
> There is no concept like stream or track in SDI. It just has 16 mono
> channels without any semantics which are arbitrarily mapped to whatever
> you need to transport.
you provided the right answer to wm4; I had not understood his question. 

> @pkv.stream: HDMI 1.x does only support up to 8 channels (7.1), which
> might be the reason for the missing 16. Did you test what happens when
> 16 audio channels are requested for HDMI out?
yes, no error thrown; every odd channel (1, 3 , 5 ...) is streamed from 
the source to the HDMI output (in my case decklink studio 4k which 
accepts 8 channel output, I am not aware of any decklink with more than 
8 channels out, anyway). The other even channels are thrown out.

As for SDI output, the 16 channels are sent without issues.

> (yes, selection of decklink video output connection via ffmpeg options
> is still missing).
the output is sent to all interfaces, both sdi and hdmi, at least in my 
decklink studio 4K.

> Matthias
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel at ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel

More information about the ffmpeg-devel mailing list