Lock-step downgrade of both packages to the revert tip of
daedalus-v4l2 (PR #10 closed PRs #7 + #8). After
0.1.0+r28+g79256dc-1 / 0.1.0+r30+g6ffe92b-1 landed in production,
mpv (--hwdec=vaapi-copy) failed pre-playing with "Unable to dequeue
buffer: Resource temporarily unavailable" because the daemon
parked CAPTURE buffers waiting for libavcodec's display-order
reorder, violating libva's V4L2 stateless 1:1 contract. See
daedalus-v4l2#9 for the diagnostic, #10 for the revert PR.
DAEDALUS_PROTO_VERSION drops 1 → 0; install both .debs in the same
apt transaction. Userspace ABI returns to the f0d4186-equivalent
behaviour, plus PR #4 (cosmetic H.264 menu controls). The
daedalus-v4l2-dkms #64 multi-kernel postinst behaviour stays in
build-deb.sh.
Visible regression: H.264 B-frame streams in Firefox return to the
"2 1 4 3 6 5" pair-swap visual. Proper fix (concurrent in-flight
requests in daemon + display-order reorder moved into libva-v4l2-
request-fourier) tracked at daedalus-v4l2#11.
Refs:
* reauktion/daedalus-v4l2#9
* reauktion/daedalus-v4l2#10 (merged)
* reauktion/daedalus-v4l2#11
claude-noether