tags 971319 +patch thanks
The ffmpeg package no longer builds libavresample-dev, it is still present in unstable as a cruft package but is completely gone from testing. So this package's build-dependencies can no longer be satisfied in testing.
Looking at the build logs and the binary dependencies it looks like aubio has already switched from using libavresample to using libswresample but the build-dependencies were never updated to match. This worked because libswresample was pulled in indirectly (I did not investigate by which path it was pulled in) I did a test build and autopkgtest run with the change and it passed, so I have uploaded the fix to delayed/5 as a NMU, please tell me if you see any problems with this upload.
diff -Nru aubio-0.4.9/debian/changelog aubio-0.4.9/debian/changelog --- aubio-0.4.9/debian/changelog 2020-01-08 12:39:53.000000000 +0000 +++ aubio-0.4.9/debian/changelog 2021-09-09 18:11:53.000000000 +0000 @@ -1,3 +1,12 @@ +aubio (0.4.9-4.1) unstable; urgency=medium + + * Non-maintainer upload. + * Change build-depends from libavresample-dev to libswresample-dev + the build logs and binary dependencies indicate the package was + already using libswresample ( Closes: 971319 ). + + -- Peter Michael Green <plugw...@debian.org> Thu, 09 Sep 2021 18:11:53 +0000 + aubio (0.4.9-4) unstable; urgency=medium * debian/tests/control: remove py2 tests diff -Nru aubio-0.4.9/debian/control aubio-0.4.9/debian/control --- aubio-0.4.9/debian/control 2020-01-04 18:53:25.000000000 +0000 +++ aubio-0.4.9/debian/control 2021-09-09 18:11:53.000000000 +0000 @@ -7,7 +7,7 @@ libjack-dev | libjack-jackd2-dev, libavcodec-dev, libavformat-dev, - libavresample-dev, + libswresample-dev, libavutil-dev, libsndfile1-dev, libsamplerate-dev,