Hi folks! Every time when I start capture video from external capture card Avermedia Live Gamer ULTRA GC553 (https://www.avermedia.com/gaming/product/game_capture/live_gamer_ultra_gc553) I got kernel error "Unknown pixelformat 0x00000000". It look like false positive because I am able record video with OBS in 4K resolution from another Linux machine or PS 4 Pro if I select video format "Planar YVU 4:2:0" or "YU12 (Emulated)" But very unpleasant to see this error in kernel log. $ uname -r 4.20.0-1.fc30.x86_64 $ lsusb Bus 004 Device 007: ID 07ca:0553 AVerMedia Technologies, Inc. [ 75.985776] ------------[ cut here ]------------ [ 75.985780] Unknown pixelformat 0x00000000 [ 75.985813] WARNING: CPU: 12 PID: 3175 at drivers/media/v4l2-core/v4l2-ioctl.c:1342 v4l_enum_fmt+0xfc0/0x1380 [videodev] [ 75.985814] Modules linked in: nls_utf8 isofs fuse rfcomm xt_CHECKSUM ipt_MASQUERADE tun bridge stp llc devlink nf_conntrack_netbios_ns nf_conntrack_broadcast xt_CT ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_nat ip6table_nat nf_nat_ipv6 ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat_ipv4 nf_nat iptable_mangle iptable_raw iptable_security nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables cmac bnep sunrpc xfs vfat fat libcrc32c edac_mce_amd arc4 kvm_amd kvm r8822be(C) snd_hda_codec_realtek snd_hda_codec_generic irqbypass snd_hda_codec_hdmi snd_hda_intel snd_hda_codec mac80211 snd_usb_audio crct10dif_pclmul snd_hda_core snd_usbmidi_lib crc32_pclmul snd_hwdep snd_rawmidi snd_seq snd_seq_device uvcvideo snd_pcm ghash_clmulni_intel btusb videobuf2_vmalloc videobuf2_memops btrtl videobuf2_v4l2 btbcm eeepc_wmi videobuf2_common btintel asus_wmi sparse_keymap bluetooth video videodev wmi_bmof joydev [ 75.985838] snd_timer cfg80211 media k10temp snd sp5100_tco i2c_piix4 soundcore ecdh_generic ccp rfkill pcc_cpufreq gpio_amdpt gpio_generic acpi_cpufreq binfmt_misc uas usb_storage hid_sony ff_memless amdgpu hid_logitech_hidpp chash amd_iommu_v2 gpu_sched drm_kms_helper ttm drm igb crc32c_intel hid_logitech_dj dca nvme i2c_algo_bit nvme_core wmi pinctrl_amd [ 75.985854] CPU: 12 PID: 3175 Comm: obs Tainted: G C 4.20.0-1.fc30.x86_64 #1 [ 75.985856] Hardware name: System manufacturer System Product Name/ROG STRIX X470-I GAMING, BIOS 1103 11/16/2018 [ 75.985862] RIP: 0010:v4l_enum_fmt+0xfc0/0x1380 [videodev] [ 75.985863] Code: c6 4b 79 b5 c0 e9 55 f1 ff ff 48 c7 c6 09 7c b5 c0 3d 56 50 38 30 0f 84 43 f1 ff ff 89 c6 48 c7 c7 1c 7d b5 c0 e8 3a 3b 57 f9 <0f> 0b 41 80 7c 24 0c 00 0f 85 45 f1 ff ff 41 8b 44 24 2c 49 8d 7c [ 75.985865] RSP: 0018:ffffa52889277cb8 EFLAGS: 00010286 [ 75.985867] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000006 [ 75.985868] RDX: 0000000000000007 RSI: 0000000000000086 RDI: ffff964cbeb168c0 [ 75.985869] RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000007 [ 75.985870] R10: 0000000000000000 R11: ffffffffbb99e22d R12: ffffa52889277dc0 [ 75.985872] R13: ffffffffc05079e0 R14: ffff964c8a790600 R15: ffffffffffffffed [ 75.985873] FS: 00007f0c1eab1f00(0000) GS:ffff964cbeb00000(0000) knlGS:0000000000000000 [ 75.985875] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 75.985876] CR2: 00007f0c08197294 CR3: 000000078795e000 CR4: 00000000003406e0 [ 75.985877] Call Trace: [ 75.985885] __video_do_ioctl+0x174/0x3b0 [videodev] [ 75.985889] ? page_add_file_rmap+0xa0/0x2d0 [ 75.985892] ? alloc_set_pte+0x293/0x660 [ 75.985897] video_usercopy+0x253/0x5a0 [videodev] [ 75.985903] ? copy_overflow+0x20/0x20 [videodev] [ 75.985906] ? selinux_file_ioctl+0x161/0x200 [ 75.985911] v4l2_ioctl+0x45/0x50 [videodev] [ 75.985914] do_vfs_ioctl+0xa4/0x630 [ 75.985916] ksys_ioctl+0x60/0x90 [ 75.985918] __x64_sys_ioctl+0x16/0x20 [ 75.985921] do_syscall_64+0x5b/0x160 [ 75.985924] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 75.985926] RIP: 0033:0x7f0c2454014d [ 75.985928] Code: 00 c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 0b 5d 0c 00 f7 d8 64 89 01 48 [ 75.985929] RSP: 002b:00007ffe01cdc5f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 75.985931] RAX: ffffffffffffffda RBX: 00007f0c08197280 RCX: 00007f0c2454014d [ 75.985932] RDX: 00007ffe01cdc660 RSI: 00000000c0405602 RDI: 0000000000000027 [ 75.985933] RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 [ 75.985934] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000007 [ 75.985935] R13: 0000000000000001 R14: 00007ffe01cdc630 R15: 000055a982fdf6e0 [ 75.985937] ---[ end trace 26d01f03c564a254 ]--- Is it possible to fix this error? Thanks -- Best Regards, Mike Gavrilov.