vf: fix another broken case of conversion filter auto-insertion

If the VO doesn't support a format output by vf_lavfi, no conversion
filter was inserted, and filter chain creation failed.

This is because vf_lavfi doesn't properly follow the format negotiation
model, which means the format negotiation pass does not catch all cases
where conversion is needed. Specifically, vf_lavfi supports that all
output formats are supported for any given input format, but then does
not actually call vf_next_query_format() in reconfig() to check which
format it uses, but outputs whatever it gets from libavfilter.

I think this is ok to avoid excessive complexity in vf_lavfi.c, but it
also means adding more kludges to vf.c. I justify this (and the code
duplication) with the idea that the current filter chain code will die
anyway at some point.

The .log field additions for c->first/c->last are strictly speaking not
needed, but useful for debugging.

0 files changed, 0 insertions, 0 deletions