[Ffmpeg-devel] Some more thoughts about libavfilter

Michael Niedermayer michaelni
Tue Jan 9 19:02:41 CET 2007


On Tue, Jan 09, 2007 at 02:38:30PM +0100, Luca Abeni wrote:
> Hi Michael,
> On Tue, 2007-01-09 at 01:51 +0100, Michael Niedermayer wrote:
> [...]
> > > 2) The "last" filter who use the AVFrame buffer is responsible for
> > > freeing it.
> [...]
> > what if there are several Fout? (several outputs)
> You are right. I forgot to mention that using this mechanism a single
> frame buffer cannot be pushed to two different output filters, and a
> copy is needed for the second output (well, I had something similar
> witten on my old notes, but it was too confused and I skipped it :).
> If this additional copy is not acceptable, then I think refcounting is
> the only way to go 

an additional copy is never a good idea ...

> (or am I missing some other possible solution?).

who knows ...

> Is it acceptable to add a reference_count field in AVFrame?

yes if its neccesary and enough to solve the problem

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Let us carefully observe those good qualities wherein our enemies excel us
and endeavor to excel them, by avoiding what is faulty, and imitating what
is excellent in them. -- Plutarch
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