[Bug 1906454] [NEW] Firefox does not NV12 for webcams

[Benjamin Drung]

Public bug reported:

I use a Sony Alhpa camera attached to Elgato Cam Link 4K as webcam. The
only color format that is working with Cam Link 4K is NV12. Sadly
Firefox does not support NV12 (despite the source code containing
several third party libraries that refer to NV12). Looking at the kernel
log for the uvcvideo kernel module, I can see that Firefox tries to use
these formats:

* MJPG (0x47504a4d)
* YU12 (0x32315559)
* YUYV (0x56595559)
* UYVY (0x59565955)

Please add support for NV12 (0x3231564e) so that the Elgato Cam Link 4K
can be used directly as webcam input.

ProblemType: Bug
DistroRelease: Ubuntu 20.10
Package: firefox 83.0+build2-0ubuntu0.20.10.1
ProcVersionSignature: Ubuntu 5.8.0-29.31-generic 5.8.14
Uname: Linux 5.8.0-29-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
AddonCompatCheckDisabled: False
ApportVersion: 2.20.11-0ubuntu50.2
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC2:  skipper    4512 F.... pulseaudio
 /dev/snd/controlC0:  skipper    4512 F.... pulseaudio
 /dev/snd/pcmC0D1p:   skipper    4512 F...m pulseaudio
 /dev/snd/controlC1:  skipper    4512 F.... pulseaudio
BuildID: 20201112153044
CasperMD5CheckResult: skip
Channel: Unavailable
CurrentDesktop: Unity:Unity7:ubuntu
Date: Tue Dec  1 23:24:23 2020
ForcedLayersAccel: False
IncompatibleExtensions:
 Deutsch (DE) Language Pack - langpack-de at firefox.mozilla.org
 English (GB) Language Pack - langpack-en-GB at firefox.mozilla.org
 English (South Africa) Language Pack - langpack-en-ZA at firefox.mozilla.org
 Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
IpRoute:
 default via 192.168.3.1 dev eth0 proto dhcp metric 100 
 169.254.0.0/16 dev eth0 scope link metric 1000 
 192.168.3.0/24 dev eth0 proto kernel scope link src 192.168.3.20 metric 100 
 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown
PrefErrors: Unexpected character ',' before close parenthesis @ /usr/lib/firefox/omni.ja:greprefs.js:354
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=83.0/20201112153044 (In use)
RunningIncompatibleAddons: True
SourcePackage: firefox
UpgradeStatus: Upgraded to groovy on 2020-11-29 (2 days ago)
dmi.bios.date: 04/27/2013
dmi.bios.release: 4.6
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3904
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: P8H67-M PRO
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3904:bd04/27/2013:br4.6:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8H67-MPRO:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: System Product Name
dmi.product.sku: SKU
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug groovy

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Title:
  Firefox does not NV12 for webcams

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