[FFmpeg-devel] [PATCH] avcodec: only warn about hwaccel with frame threads

[wm4]

On Sun, 24 Jan 2016 20:03:01 -0500
"Ronald S. Bultje" <rsbultje at gmail.com> wrote:

> Hi,
> 
> On Sun, Jan 24, 2016 at 6:49 PM, Hendrik Leppkes <h.leppkes at gmail.com>
> wrote:

 
> > Unfortunately that doesn't alleviate the other issues, like the
> > complexity needed in the decoders during frame threading, or the extra
> > resources needed (extra image surfaces for every thread).
> >  
> 
> So, the extra code is just in the decoders, which already need it anyway
> (because they implement frame-mt), right? Or do hwaccels need extra code
> also?
> 
> The extra resources aren't a big deal IMO. Memory use isn't typically a big
> issue, we're adding a fw kb extra for contexts but practically all memory
> is in framebuffers regardless.

It's can be a big deal for hardware decoding, because hw surfaces
might be a more constrained resource than system RAM. Also, you often
have to preallocate _all_ surfaces you're going to use, so you'll have
to add the exact number of additionally needed surfaces to the
preallocation.