vp9 encoder returns null packets

[githubquestions]

vpx_codec_get_cx_data returning null any ideas

[githubquestions]

update: got this to work using env-libvpx-sys fork from this fork, but still struggling to get audio to work. cpal updated its API to get rid of event loop, so instead using build_input_stream.
Pretty sure

let s2 = interpolate::Converter::from_hz_to_hz(
                          signal::from_interleaved_samples_iter::<_, [_; $chan]>($signal),
                          BorrowedInterpolator(&mut p),
                          f64::from(fmt.sample_rate().0), //as _,
                          SAMPLE_RATE as _,
                      );

                 
                      for frame in s2.until_exhausted() {
                          $i.extend_from_slice(&frame);
                          if $i.len() >= target {
                          let n = $write;
                          at.add_frame(&$o[..n], time, true); //TODO: Which frames are key?
                          $i.clear();
                          time += 20_000_000;
                          }
                      }

should still work, but still struggling with how to use cpal::StreamData::Input from main macro.