[FFmpeg-devel] [PATCH v2] avfilter/vf_libvmaf: Add metadata propagation support

[Yigithan Yigit]

Hi,

> Could we somehow get the AVFrame pointer in your custom callback data
> or the VmafMetadata data? When all of the expected metadata is written
> then you'll know you're ready to forward the frame through the
> filtergraph. Doing it this way hopefully avoids a lot of the code and
> traversing through linked lists looking for AVFrame pointers as you've
> done.

Thanks for the suggestion! 

I think main difficulty of the implementation is sending non-monotical vmaf frames in order. Tracking the written metadata is not enough in my opinion. We need some kind of structure that need to put frames in order before they sent or it should need to send in order somehow. I have been working on kinda similar solution for couple of days that I did with linked list but with using av_fifo instead of my implementation. It looks working fine. Tests are welcome.

https://github.com/yigithanyigit/FFmpeg/pull/3/files

NOTE: This implementation uses small vmaf patch that I mentioned earlier in the thread.

Thanks,
Yigithan