[FFmpeg-devel] [PATCH 2/3] avfiltergraph: don't query formats if filter has uninitialized inputs

Michael Niedermayer michaelni at gmx.at
Thu May 3 19:48:04 CEST 2012

On Thu, May 03, 2012 at 07:19:48PM +0200, Nicolas George wrote:
> Le quintidi 15 floréal, an CCXX, Michael Niedermayer a écrit :
> > after merging formats
> > each filters output could be choosen so as to maximize the similarity
> > to its input and minimize loss of information.
> That does not work with amerge. Lavfi has two models for the
> interdependencies of formats for links:
> - the links point to the same list of format, in the end they will have the
>   same format;
> - the links point to different lists, lavfi can choose the formats
>   independently.
> amerge does not fit these models: it accepts anything as input, but the
> format for the output is entirely determined by the formats for the inputs,
> with a non-trivial function.
> The solution would probably be to re-call query_format during the graph
> configuration to let it recompute the output format.

what disadvantage does it have if it supports any output and calls
libswresample when it cannot otherwise produce it ?


Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Many that live deserve death. And some that die deserve life. Can you give
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even the very wise cannot see all ends. -- Gandalf
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