0.8.1 won't build against ffmpeg 7.1

[alucryd]

New ffmpeg release has moved a struct member: FFmpeg/FFmpeg@7f17e0e

Building 0.8.1 against the new ffmpeg results in the following error:

../neatvnc/src/h264-encoder.c: In function ‘h264_encoder_create’:
../neatvnc/src/h264-encoder.c:550:58: error: ‘AVFilterLink’ has no member named ‘hw_frames_ctx’
  550 |                 av_buffer_ref(self->filter_out->inputs[0]->hw_frames_ctx);
      |                                                          ^~

[any1]

Thanks for the heads-up.

We're abusing a "private" API for this, but there's really no other way to get at this. Maybe I can allocate my own hw_frames_ctx and put it there.

[any1]

Huh, looks like they may have added a function for it called av_buffersink_get_hw_frames_ctx.

[any1]

Should be fixed now; haven't built against 7.1 though.