[FFmpeg-user] Causes of color bars?

[Marton Balint]

On Wed, 15 Jul 2020, Moritz Barsnick wrote:

> On Tue, Jul 14, 2020 at 15:50:55 -0600, Simon Roberts wrote:
>> On Tue, Jul 14, 2020 at 1:29 AM Carl Zwanzig <cpz at tuunq.com> wrote:
>>
>> > Decklink boards are _very_ touchy about formats and parameters. Try setting
>> > at least the resolution and frame rate on the input and see if that helps.
>> >
>> > I don't guarantee these, but it's a start:
>> > -f decklink -pix_fmt uyvy422 -s 720x486 -r 30000/1001 "DeckLink SDI 4K"
>
> I'm certain there's an "-i" missing before "DeckLink SDI 4K".

FFplay does not need -i.

Also the rest if the options are not needed/used for decklink input 
only -format_code matters. Please check the docs for the decklink options:

https://www.ffmpeg.org/ffmpeg-all.html#Options-57

Regards,
Marton