[FFmpeg-devel] [PATCH] vf_scale: Detecting changes of incoming frame properties and dinamically evaluate width and height expressions

[wm4]

On Tue, 19 Jan 2016 19:00:18 +0100
Bodecs Bela <bodecsb at vivanet.hu> wrote:

> 2016.01.19. 16:53 keltezéssel, Carl Eugen Hoyos írta:
> > Bodecs Bela <bodecsb <at> vivanet.hu> writes:
> >  
> >> To retain the current behaviour and not to break any
> >> earlier app, a new config parameter has been introduced.  
> > Is the current behaviour useful or do you consider it a bug?  
> First I thought that it was a bug, but I borrowed an idea from 
> vf_overlay filter, where there is a very same config parameter causing a 
> very similar behaviour distinction on expression evaluation.
> I will soon post a patch to vf_overlay where there was really a bug in 
> this behaviour.

I think it's actually a bug. From what I can tell libavfilter's design
doesn't actually support mid-stream reconfiguration, although it
happens to work in some cases?