[FabienDanieau]

webrtcsink's default mitigation lowers the resolution below 2 Mbps, which puts a software videoscale in front of mpph264enc. A system-memory frame into mpph264enc is the path that oopsed the board kernel twice; the camera's own buffers are safe. With enable-mitigation-modes=downsampled, a weak link only costs frame rate (videorate drops frames), so the camera buffers still reach the encoder untouched.

Pairs with pollen-robotics/microduck_yocto#59, which lets webrtcsink scale again (the patched plugin had an identity there, so downscaling failed to negotiate).

Tested on the Zero 3W with that bundle and this change on top of 0.17.8: Chrome behind a 600 kbit/s policer kept 1280x720 and settled at 15 fps, no negotiation error, kernel clean. 117 mediad tests pass.

Note: cargo clippy -D warnings fails on Rust 1.99 for reasons already on main (fetch_update deprecated in pipeline.rs/stream.rs, single-element loop at pipeline.rs:2393), not from this change.

🤖 Generated with Claude Code

[github-actions]

Coverage

73.87% lines on this branch, against a floor of 70%.

Per-file

Filename                              Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
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btd/src/bluez.rs                          533               533     0.00%          35                35     0.00%         346               346     0.00%           0                 0         -
btd/src/chorale.rs                        346               246    28.90%          23                13    43.48%         231               172    25.54%           0                 0         -
btd/src/link.rs                            24                 0   100.00%           3                 0   100.00%          26                 0   100.00%           0                 0         -
btd/src/main.rs                            77                77     0.00%          11                11     0.00%          77                77     0.00%           0                 0         -
btd/src/pairing.rs                        149                 2    98.66%          12                 1    91.67%          81                 1    98.77%           0                 0         -
btd/src/route.rs                          389                37    90.49%          30                 0   100.00%         381                13    96.59%           0                 0         -
btd/src/session.rs                       1218                73    94.01%          71                 5    92.96%         706                41    94.19%           0                 0         -
btd/src/upstream.rs                       397                35    91.18%          34                 8    76.47%         242                19    92.15%           0                 0         -
configd/src/bluez.rs                      586               498    15.02%          85                79     7.06%         375               326    13.07%           0                 0         -
configd/src/identity.rs                    56                 3    94.64%           7                 1    85.71%          30                 3    90.00%           0                 0         -
configd/src/indicator.rs                  105                49    53.33%           8                 4    50.00%          72                27    62.50%           0                 0         -
configd/src/logs.rs                       314                33    89.49%          31                 3    90.32%         219                36    83.56%           0                 0         -
configd/src/main.rs                       525               525     0.00%          38                38     0.00%         349               349     0.00%           0                 0         -
configd/src/net.rs                        246                12    95.12%          38                 2    94.74%         181                 4    97.79%           0                 0         -
configd/src/nm.rs                         271               213    21.40%          43                39     9.30%         171               120    29.82%           0                 0         -
configd/src/pad.rs                        379                13    96.57%          38                 2    94.74%         222                 8    96.40%           0                 0         -
configd/src/power.rs                       30                30     0.00%           6                 6     0.00%          28                28     0.00%           0                 0         -
configd/src/store.rs                      350                25    92.86%          28                 2    92.86%         173                 9    94.80%           0                 0         -
configd/src/units.rs                      183               116    36.61%          24                18    25.00%         116                79    31.90%           0                 0         -
duck-ble/src/adv.rs                       138                 0   100.00%          13                 0   100.00%          65                 0   100.00%           0                 0         -
duck-ble/src/framing.rs                   281                 9    96.80%          25                 1    96.00%         140                 5    96.43%           0                 0         -
duck-ble/src/gatt.rs                        3                 0   100.00%           1                 0   100.00%           3                 0   100.00%           0                 0         -
duck-control/src/bus.rs                   683               547    19.91%          61                46    24.59%         469               382    18.55%           0                 0         -
duck-control/src/fall.rs                  173                 0   100.00%          15                 0   100.00%         108                 0   100.00%           0                 0         -
duck-control/src/imu.rs                   370                 8    97.84%          20                 0   100.00%         195                 5    97.44%           0                 0         -
duck-control/src/io.rs                    160                17    89.38%          29                 5    82.76%         148                17    88.51%           0                 0         -
duck-control/src/model.rs                 156                 2    98.72%          19                 0   100.00%          95                 0   100.00%           0                 0         -
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duck-control/src/pickup.rs                400               144    64.00%          35                15    57.14%         265               100    62.26%           0                 0         -
duck-control/src/policy.rs                701               560    20.11%          67                47    29.85%         457               350    23.41%           0                 0         -
duck-control/src/safety.rs                694                15    97.84%          49                 1    97.96%         424                 7    98.35%           0                 0         -
duck-control/src/sim.rs                   464                62    86.64%          34                10    70.59%         249                39    84.34%           0                 0         -
duck-detect/src/bin/duck-bench.rs         306               306     0.00%          16                16     0.00%         170               170     0.00%           0                 0         -
duck-detect/src/lib.rs                    258                 1    99.61%          14                 0   100.00%         149                 0   100.00%           0                 0         -
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duck-ether/src/main.rs                    504               404    19.84%          27                16    40.74%         270               217    19.63%           0                 0         -
duck-ipc-proto/src/led.rs                 188                 0   100.00%          12                 0   100.00%          74                 0   100.00%           0                 0         -
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duck-ipc-proto/src/vetbook.rs             375                54    85.60%          24                 2    91.67%         209                25    88.04%           0                 0         -
duckctl/src/main.rs                      2937              1193    59.38%         175                53    69.71%        1827               767    58.02%           0                 0         -
duckctl/src/udp_pad.rs                   1007               521    48.26%          65                26    60.00%         551               296    46.28%           0                 0         -
duckctl/src/udp_pad/claim.rs              180                13    92.78%          17                 1    94.12%          91                 6    93.41%           0                 0         -
duckctl/src/udp_pad/link.rs               332                15    95.48%          25                 2    92.00%         182                 7    96.15%           0                 0         -
duckctl/src/udp_pad/panel.rs             1287               329    74.44%          60                15    75.00%         715               166    76.78%           0                 0         -
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duckctl/src/udp_pad/voice/alsa.rs         145               145     0.00%          14                14     0.00%         100               100     0.00%           0                 0         -
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mediad/src/exposure.rs                    564               172    69.50%          37                 8    78.38%         374               122    67.38%           0                 0         -
mediad/src/frame.rs                       683                54    92.09%          35                 1    97.14%         392                18    95.41%           0                 0         -
mediad/src/indicator.rs                    37                25    32.43%           4                 2    50.00%          24                16    33.33%           0                 0         -
mediad/src/main.rs                        445               445     0.00%          14                14     0.00%         293               293     0.00%           0                 0         -
mediad/src/pipeline.rs                   2043              1769    13.41%         135               108    20.00%        1317              1124    14.65%           0                 0         -
mediad/src/producer.rs                    183                34    81.42%          22                 5    77.27%         137                21    84.67%           0                 0         -
mediad/src/relay.rs                      2391               244    89.80%         189                28    85.19%        1623               176    89.16%           0                 0         -
mediad/src/route.rs                       185                19    89.73%          12                 0   100.00%         160                 8    95.00%           0                 0         -
mediad/src/sensor.rs                      288                15    94.79%          24                 2    91.67%         166                 9    94.58%           0                 0         -
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mediad/src/snapshot.rs                    174                15    91.38%          10                 0   100.00%         108                 2    98.15%           0                 0         -
mediad/src/stream.rs                      836               136    83.73%          54                10    81.48%         529                91    82.80%           0                 0         -
mediad/src/turn.rs                        487                32    93.43%          44                 3    93.18%         299                17    94.31%           0                 0         -
mediad/src/upstream.rs                    263                16    93.92%          17                 1    94.12%         160                12    92.50%           0                 0         -
mediad/src/vetbook.rs                      77                60    22.08%           7                 4    42.86%          43                33    23.26%           0                 0         -
mediad/src/web.rs                         340                30    91.18%          28                 4    85.71%         218                19    91.28%           0                 0         -
netpadd/src/health.rs                     209                58    72.25%          16                 2    87.50%         105                31    70.48%           0                 0         -
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netpadd/src/receiver.rs                  1140                 6    99.47%          41                 0   100.00%         435                 4    99.08%           0                 0         -
netpadd/src/robotd.rs                      91                22    75.82%          15                 3    80.00%          61                11    81.97%           0                 0         -
nfc/src/clrc663.rs                        217               217     0.00%          15                15     0.00%         147               147     0.00%           0                 0         -
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nfc/src/tag.rs                            134               134     0.00%           4                 4     0.00%          80                80     0.00%           0                 0         -
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pad-imu/src/lib.rs                        608                 7    98.85%          39                 0   100.00%         372                 5    98.66%           0                 0         -
pad-map/src/bindings.rs                   127                 9    92.91%           6                 0   100.00%          80                 5    93.75%           0                 0         -
pad-map/src/buttons.rs                     29                 0   100.00%           5                 0   100.00%          20                 0   100.00%           0                 0         -
pad-map/src/continuous.rs                 207                 0   100.00%          17                 0   100.00%         114                 0   100.00%           0                 0         -
pad-map/src/hold.rs                       253                 1    99.60%          11                 0   100.00%         123                 1    99.19%           0                 0         -
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pad-map/src/loss.rs                       214                 4    98.13%          18                 0   100.00%         129                 2    98.45%           0                 0         -
pad-map/src/mapper.rs                     879                89    89.87%          40                 3    92.50%         608                81    86.68%           0                 0         -
pad-map/src/wire.rs                       395                30    92.41%          32                 2    93.75%         302                17    94.37%           0                 0         -
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padd/src/tap.rs                          1311               681    48.05%          74                36    51.35%         790               407    48.48%           0                 0         -
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updater/src/source/http.rs                391                87    77.75%          35                11    68.57%         309                92    70.23%           0                 0         -
updater/src/source/local.rs               346                33    90.46%          36                 8    77.78%         192                23    88.02%           0                 0         -
updater/src/source/mod.rs                  39                30    23.08%           4                 2    50.00%          30                24    20.00%           0                 0         -
updater/src/spawn.rs                       94                13    86.17%           5                 0   100.00%          49                 4    91.84%           0                 0         -
updater/src/store.rs                      593                41    93.09%          43                 7    83.72%         271                42    84.50%           0                 0         -
updater/src/transcript.rs                 518                42    91.89%          31                 3    90.32%         290                22    92.41%           0                 0         -
updater/src/unix.rs                        44                 3    93.18%           3                 0   100.00%          22                 2    90.91%           0                 0         -
updater/src/verify.rs                     786                95    87.91%          55                18    67.27%         424                75    82.31%           0                 0         -
updater/src/vetbook.rs                    408                66    83.82%          34                10    70.59%         285                54    81.05%           0                 0         -
uyvy/src/lib.rs                           383                14    96.34%          13                 0   100.00%         184                 8    95.65%           0                 0         -
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                  109451             27943    74.47%        7113              1772    75.09%       67328             17595    73.87%           0                 0         -