[FFmpeg-devel] [PATCH v10 2/5] libavcodec/webp: add support for animated WebP

[Andreas Rheinhardt]

James Almer:
> On 2/19/2024 1:50 PM, Andreas Rheinhardt wrote:
>> a) Use the receive frame callback for this decoder. This will
>> necessitate changes to pthread_frame.c (which currently can't handle
>> receive_frame decoders)
> 
> There's a patch for this that i think Anton wrote and then Timo
> improved. It was posted sometime ago.
> 
>> Notice that the BSF I have in mind would not be a public BSF, but a
>> private one (given that the output of the BSF would be spec-incompliant
>> due to the wrong ordering it should not be public), i.e. one not
>> accessible via av_bsf_get_by_name() or av_bsf_iterate().
> 
> How do you propose to do this? And would you be willing to write the
> framework for it?
> It certainly sounds useful, as existing bsfs like vp9_superframe_split
> already generate spec non-compliant packets, and they ideally should not
> be publicly available.

The way I envision is by using a const FFBitStreamFilter* instead of the
name of the bsf in FFCodec.bsfs. (Of course, one can keep the
open-by-string method (which also works for filterchains as long as they
only use static arguments), too; it is also possible (by currently
unneeded) to add bsfs during init with non-static arguments (based upon
codec options etc.).)
I'd be willing to write the code for this.

- Andreas