[FFmpeg-user] Pixel format: default and filter?

[amindfv at mailbox.org]

On Sun, Sep 13, 2020 at 07:06:56AM -0400, Edward Park wrote:
> Hi,
> 
> > ffprobe now reports out.mov being yuv420p. Is this an implicit conversion to a lower bit depth?
> 
> It's just the default output format for overlay. It's commonly used for stuff across colorspaces (like yuv420p video and argb png logos overlaid) especially with alpha.
> 
> You can set format option in the filter itself to force output format. I assume it doesn't do any conversions when you overlay two sources with same format with no alpha internally.
> 

Thanks both, that's helpful. How can I determine the pixel formats that ffmpeg has chosen for the filters' input and output pads?

Tom