[Libav-user] No pix_fmt auto conversion in avfilter?

Andrey Utkin andrey.krieger.utkin at gmail.com
Wed Feb 15 12:11:30 CET 2012

Could somebody explain why this code fails when FILTER_STRING is not
"scale", but just "fifo" or "copy"?
The reason is that AVFrame out from filtergraph has 0x0 dimensions.
The point is that pixel format conversion must take place, but i don't
understand why avfilter doesn't sort it out automatically.
It is surprising because when i open "buffer" video source for
avfilter, i point in its params that input is in PIX_FMT_RGBA.
Could / should this be "fixed", so auto-coversion took place in such cases?
If so, i'd appreciate advices how to patch the libavfilter.

Andrey Utkin

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