[FFmpeg-devel] [PATCH] libavfilter/vf_overlay_cuda: Pass the main frame to the output if secondary frame is not available. now filter fails if secondary frame is not available due to e.g secondary source delay.

[Alex Pokotilo]

> One observation not related to vf_overlay_cude fix if you don't mind:
> even with the fix you proposed if I don't send a single frame into
> fs->in[1](i.e secondary stream) I cannot get any output.
> This is because consume_from_fifos doesn't honor .before ==
> EXT_INFINITY and .state == STATE_BOF
>

let me correct myself: consume_from_fifos doesn't honor .before ==
EXT_NULL and .state == STATE_BOF

> and requires at least one frame for each input.
> I cannot say is it WAD or not - just my observation.
> When I read a description about EXT_INFINITY I guessed this flag
> should force processing other inputs ignoring this one

Again let me correct myself here too:  I think that if I set
fs->in[1].before== EXT_NULL (this is default behavior)
framesync should return main frames even if I don't send any frames
into fs->in[1].
but consume_from_fifos doesn't honor .before == EXT_NULL and .state ==
STATE_BOF and this is why it waits for fs->in[1] frames forever.
Sorry for bothering you with unrelated question