[FFmpeg-devel] [PATCH] doc/outdevs: Add declink signal generator example

Mike Goins midicase at gmail.com
Thu Mar 15 10:40:47 EET 2018

On Fri, Mar 9, 2018 at 3:38 PM, Devin Heitmueller
<dheitmueller at ltnglobal.com> wrote:
>>> +ffmpeg -re -f lavfi -i "testsrc=s=1920x1080:rate=30000/1000" -f lavfi -i "sine=frequency=1000:sample_rate=48000" +        -ac 2 -acodec pcm_s16le -pix_fmt uyvy422 -format_code Hi30 -f decklink 'DeckLink Studio 2'
>> You should not need the -re flag, the decklink outdev blocks if it gets too many frames and because of this the "encoding" speed should be limited to realtime even without -re. Or you see something different?

If don't use -re I get an average of ~31 fps and speed 1.03x, but with
-re the status stays at 30 fps and 1x.  No idea why the difference.

> Also, isn’t -format_code a capture parameter?  Is it even valid to provide that on output?
> I had plans to add support for -format_code for output - if it’s already working then that’s great.

You are right, -format_code does not appear to do anything for the output.

> Devin
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