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#2182·mediamtx

If the camera source fails the API does not reflect the stream is not available.

Author: neutralvibesCreated Aug 9, 2023Updated Sep 12, 2026
Labelsenhancementrpi-camera

Which version are you using?

v1.0.0

Which operating system are you using?

  • Linux amd64 standard
  • Linux amd64 Docker
  • Linux arm64 standard
  • Linux arm64 Docker
  • Linux arm7 standard
  • Linux arm7 Docker
  • Linux arm6 standard
  • Linux arm6 Docker
  • Windows amd64 standard
  • Windows amd64 Docker (WSL backend)
  • macOS amd64 standard
  • macOS amd64 Docker
  • Other (please describe)

Describe the issue

Description

If the camera source fails the API does not reflect the stream is not available. The ready and sourceReady states are set to true. In my case the camera starts fine, but can fail at some point during operation, although in my tests the issue still exists if it fails to start. This means early cheap detection of issues by automated querying of the api is not possible, at least for the case of the piCamera. I am unsure if this is by design so a bug, or feature request. Thanks for reading.

json
{
  "name": "stream",
  "confName": "stream",
  "conf": {
    "source": "rpiCamera",
    "sourceFingerprint": "",
    "sourceOnDemand": false,
    "sourceOnDemandStartTimeout": "10s",
    "sourceOnDemandCloseAfter": "10s",
    "publishUser": "",
    "publishPass": "",
    "publishIPs": [],
    "readUser": "",
    "readPass": "",
    "readIPs": [],
    "disablePublisherOverride": false,
    "fallback": "",
    "sourceProtocol": "automatic",
    "sourceAnyPortEnable": false,
    "rtspRangeType": "",
    "rtspRangeStart": "",
    "sourceRedirect": "",
    "rpiCameraCamID": 0,
    "rpiCameraWidth": 1280,
    "rpiCameraHeight": 720,
    "rpiCameraHFlip": false,
    "rpiCameraVFlip": true,
    "rpiCameraBrightness": 0,
    "rpiCameraContrast": 1,
    "rpiCameraSaturation": 1,
    "rpiCameraSharpness": 1,
    "rpiCameraExposure": "normal",
    "rpiCameraAWB": "auto",
    "rpiCameraDenoise": "off",
    "rpiCameraShutter": 0,
    "rpiCameraMetering": "centre",
    "rpiCameraGain": 0,
    "rpiCameraEV": 0,
    "rpiCameraROI": "",
    "rpiCameraHDR": false,
    "rpiCameraTuningFile": "",
    "rpiCameraMode": "",
    "rpiCameraFPS": 30,
    "rpiCameraIDRPeriod": 60,
    "rpiCameraBitrate": 1000000,
    "rpiCameraProfile": "main",
    "rpiCameraLevel": "4.1",
    "rpiCameraAfMode": "auto",
    "rpiCameraAfRange": "normal",
    "rpiCameraAfSpeed": "normal",
    "rpiCameraLensPosition": 0,
    "rpiCameraAfWindow": "",
    "rpiCameraTextOverlayEnable": false,
    "rpiCameraTextOverlay": "%Y-%m-%d %H:%M:%S - feed",
    "runOnInit": "",
    "runOnInitRestart": false,
    "runOnDemand": "",
    "runOnDemandRestart": false,
    "runOnDemandStartTimeout": "10s",
    "runOnDemandCloseAfter": "10s",
    "runOnReady": "",
    "runOnReadyRestart": false,
    "runOnRead": "",
    "runOnReadRestart": false
  },
  "source": {
    "type": "rpiCameraSource",
    "id": ""
  },
  "sourceReady": true, # ** HERE **
  "ready": true, # ** HERE **
  "readyTime": "2023-08-08T15:42:33.167052689+01:00",
  "tracks": [
    "H264"
  ],
  "bytesReceived": 7794081016,
  "readers": [
    {
      "type": "rtspSession",
      "id": "ba951152-9c27-4041-8b0a-3117aa7829b8"
    },
    {
      "type": "rtspSession",
      "id": "e901ad5e-a719-4546-836a-e30291cf508c"
    }
  ]
}

Describe how to replicate the issue

Can only be replicated by camera failure during operation

  1. start the server
  2. publish with ...
  3. read with ...

Did you attach the server logs?

Kernel

bash
Aug 09 08:56:23 zero3 kernel: 8<--- cut here ---
Aug 09 08:56:23 zero3 kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000000
Aug 09 08:56:24 zero3 kernel: [00000000] *pgd=03c88831, *pte=00000000, *ppte=00000000
Aug 09 08:56:24 zero3 kernel: Internal error: Oops: 17 [#1] ARM
Aug 09 08:56:24 zero3 kernel: Modules linked in: xt_conntrack nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack_netlink nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 xt_addrtype nft_compat nf_tables nfnetlink br_netfilter bridge cmac algif_hash aes_arm aes_generic ecb algif_skcipher af_alg bnep ov5647 hci_uart btbcm bluetooth ecdh_generic ecc libaes vc4 brcmfmac snd_soc_hdmi_codec drm_display_helper cec brcmutil sha256_generic libsha256 8021q garp stp llc drm_dma_helper cfg80211 overlay drm_kms_helper snd_soc_core bcm2835_unicam snd_compress snd_pcm_dmaengine v4l2_dv_timings syscopyarea i2c_mux_pinctrl sysfillrect i2c_mux bcm2835_codec(C) sysimgblt fb_sys_fops v4l2_fwnode raspberrypi_hwmon v4l2_async bcm2835_v4l2(C) bcm2835_isp(C) v4l2_mem2mem bcm2835_mmal_vchiq(C) videobuf2_vmalloc rfkill videobuf2_dma_contig videobuf2_memops videobuf2_v4l2 videobuf2_common snd_bcm2835(C) videodev snd_pcm snd_timer i2c_bcm2835 snd mc vc_sm_cma(C) uio_pdrv_genirq fixed uio drm fuse drm_panel_orientation_quirks backlight
Aug 09 08:56:24 zero3 kernel:  ip_tables x_tables ipv6
Aug 09 08:56:24 zero3 kernel: CPU: 0 PID: 3396 Comm: rtspss-embedded Tainted: G         C         6.1.21+ #1642
Aug 09 08:56:24 zero3 kernel: Hardware name: BCM2835
Aug 09 08:56:24 zero3 kernel: PC is at iso_debugfs+0xde8c/0xffff485c [bluetooth]
Aug 09 08:56:24 zero3 kernel: LR is at video_usercopy+0x4a4/0x574 [videodev]
Aug 09 08:56:24 zero3 kernel: pc : [<bfa83d10>]    lr : [<bf247cb0>]    psr: 60000013
Aug 09 08:56:24 zero3 kernel: sp : d8919e50  ip : c43a6180  fp : c0c2f02c
Aug 09 08:56:24 zero3 kernel: r10: b39107a8  r9 : 00000000  r8 : c41fd500
Aug 09 08:56:24 zero3 kernel: r7 : d8919e74  r6 : 00000000  r5 : c0445611  r4 : c0505611
Aug 09 08:56:24 zero3 kernel: r3 : 0000003c  r2 : bf269240  r1 : 69a527b4  r0 : 00000000
Aug 09 08:56:24 zero3 kernel: Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Aug 09 08:56:24 zero3 kernel: Control: 00c5387d  Table: 03184008  DAC: 00000055
Aug 09 08:56:24 zero3 kernel: Register r0 information: NULL pointer
Aug 09 08:56:24 zero3 kernel: Register r1 information: non-paged memory
Aug 09 08:56:24 zero3 kernel: Register r2 information: 59-page vmalloc region starting at 0xbf240000 allocated at load_module+0x888/0x1d04
Aug 09 08:56:26 zero3 kernel: Register r3 information: non-paged memory
Aug 09 08:56:26 zero3 kernel: Register r4 information: non-slab/vmalloc memory
Aug 09 08:56:26 zero3 kernel: Register r5 information: non-slab/vmalloc memory
Aug 09 08:56:26 zero3 kernel: Register r6 information: NULL pointer
Aug 09 08:56:26 zero3 kernel: Register r7 information: 2-page vmalloc region starting at 0xd8918000 allocated at kernel_clone+0xac/0x31c
Aug 09 08:56:26 zero3 kernel: Register r8 information: slab kmalloc-64 start c41fd500 pointer offset 0 size 64
Aug 09 08:56:26 zero3 kernel: Register r9 information: NULL pointer
Aug 09 08:56:26 zero3 kernel: Register r10 information: non-paged memory
Aug 09 08:56:26 zero3 kernel: Register r11 information: non-slab/vmalloc memory
Aug 09 08:56:26 zero3 kernel: Register r12 information: slab task_struct start c43a6180 pointer offset 0
Aug 09 08:56:26 zero3 kernel: Process rtspss-embedded (pid: 3396, stack limit = 0x025cf507)
Aug 09 08:56:26 zero3 kernel: Stack: (0xd8919e50 to 0xd891a000)
Aug 09 08:56:26 zero3 kernel: 9e40:                                     d8919e73 c0052d60 c3d37b40 0000003c
Aug 09 08:56:26 zero3 kernel: 9e60: b3910830 d8919eb4 00000001 0000003c 00c3b8a0 00000000 0000000a 00000000
Aug 09 08:56:26 zero3 kernel: 9e80: 00004000 00000001 00000000 00011c9c 00000000 0007dc96 00000000 00000000
Aug 09 08:56:26 zero3 kernel: 9ea0: 00000000 00000000 00000000 00000000 00000004 c41fd500 00000001 00000000
Aug 09 08:56:28 zero3 kernel: 9ec0: 00000000 c3da6180 c35e9a80 c0087b34 d8919f2c 0c0c5c4d 15584f9a 00000000
Aug 09 08:56:28 zero3 kernel: 9ee0: 9b2dd5f5 c022e3a4 2d506de7 00000000 00000000 69a527b4 d8919f80 c0445611
Aug 09 08:56:28 zero3 kernel: 9f00: c3d37b41 c3d37b40 c0c2f02c b39107a8 00000000 0000001c c288e048 c022c198
Aug 09 08:56:28 zero3 kernel: 9f20: 00000000 00000000 0bebc200 c43ddd21 00000000 00000000 00011c9c 00000000
Aug 09 08:56:28 zero3 kernel: 9f40: 2d506de7 00000000 00000000 69a527b4 0bebc200 c0c2f02c 00000001 b39107a0
Aug 09 08:56:28 zero3 kernel: 9f60: 000000a8 c0008408 c43a6180 00000000 00000004 c022eb18 0bebc200 69a527b4
Aug 09 08:56:28 zero3 kernel: 9f80: 00011c9c 00000001 008504e0 0000001c 00000036 c0008408 c43a6180 00000000
Aug 09 08:56:28 zero3 kernel: 9fa0: 00000004 c0008260 00000001 008504e0 0000001c c0445611 b39107a8 b3910830
Aug 09 08:56:28 zero3 kernel: 9fc0: 00000001 008504e0 0000001c 00000036 000f4240 c044560f 00080000 00000004
Aug 09 08:56:28 zero3 kernel: 9fe0: 0002a0d8 b391078c 00017008 b6a9753c 80000010 0000001c 00000000 00000000
Aug 09 08:56:28 zero3 kernel:  video_usercopy [videodev] from sys_ioctl+0x10c/0x90c
Aug 09 08:56:28 zero3 kernel:  sys_ioctl from ret_fast_syscall+0x0/0x1c
Aug 09 08:56:28 zero3 kernel: Exception stack(0xd8919fa8 to 0xd8919ff0)
Aug 09 08:56:28 zero3 kernel: 9fa0:                   00000001 008504e0 0000001c c0445611 b39107a8 b3910830
Aug 09 08:56:28 zero3 kernel: 9fc0: 00000001 008504e0 0000001c 00000036 000f4240 c044560f 00080000 00000004
Aug 09 08:56:28 zero3 kernel: 9fe0: 0002a0d8 b391078c 00017008 b6a9753c
Aug 09 08:56:28 zero3 kernel: Code: 0000005c 00030012 000094a8 bfa49380 (000007d8)
Aug 09 08:56:28 zero3 kernel: ---[ end trace 0000000000000000 ]---

mediamtx

encoder_encode(): ioctl(VIDIOC_QBUF) failed

yes

Did you attach a network dump?

no

Source: bluenviron/mediamtx

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