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V4L2 Plugin Crash #184

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voice06 opened this issue Jul 16, 2014 · 9 comments
Closed

V4L2 Plugin Crash #184

voice06 opened this issue Jul 16, 2014 · 9 comments

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@voice06
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voice06 commented Jul 16, 2014

Whenever I attempt to add a webcam source OBS-Studio locks up, running it through GDB shows a segmentation fault:

(gdb) run
Starting program: /usr/local/bin/obs 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe6eb7700 (LWP 6959)]
Attempted path: share/obs/obs-studio/locale/en-US.ini
Attempted path: /usr/local/share/obs/obs-studio/locale/en-US.ini
Attempted path: share/obs/obs-studio/locale.ini
Attempted path: /usr/local/share/obs/obs-studio/locale.ini
Attempted path: share/obs/obs-studio/license/gplv2.txt
Attempted path: /usr/local/share/obs/obs-studio/license/gplv2.txt
[New Thread 0x7fffe4f32700 (LWP 6961)]
QObject::connect: invalid null parameter
info: OBS 0.4.0-5-g07ac02e-modified (linux)
info: X and Y: 909 480
Backbuffers: 2
Color Format: 3
ZStencil Format: 0
Adapter: 0

info: OpenGL version: 3.2.0 NVIDIA 331.89

info: Created new platform data
info: Attempting path: share/obs/libobs/default.effect

info: Attempting path: /usr/local/share/obs/libobs/default.effect

info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: Attempting path: share/obs/libobs/solid.effect

info: Attempting path: /usr/local/share/obs/libobs/solid.effect

info: Attempting path: share/obs/libobs/format_conversion.effect

info: Attempting path: /usr/local/share/obs/libobs/format_conversion.effect

info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: video settings reset:
    base resolution:   1440x900
    output resolution: 960x600
    fps:               60/1
[New Thread 0x7fffdf13d700 (LWP 6962)]
[New Thread 0x7fffddaf2700 (LWP 6963)]
info: audio settings reset:
    samples per sec: 44100
    speakers:        2
    buffering (ms):  1000

[New Thread 0x7fffdd2f1700 (LWP 6964)]
info: Attempting path: ../../obs-plugins/64bit/libimage-source.so

info: Attempting path: /usr/local/lib/obs-plugins/libimage-source.so

info: Attempting path: share/obs/obs-plugins/image-source/locale/en-US.ini

info: Attempting path: /usr/local/share/obs/obs-plugins/image-source/locale/en-US.ini

info: Attempting path: ../../obs-plugins/64bit/libobs-ffmpeg.so

info: Attempting path: /usr/local/lib/obs-plugins/libobs-ffmpeg.so

info: Attempting path: share/obs/obs-plugins/obs-ffmpeg/locale/en-US.ini

info: Attempting path: /usr/local/share/obs/obs-plugins/obs-ffmpeg/locale/en-US.ini

info: Attempting path: ../../obs-plugins/64bit/libobs-libfdk.so

info: Attempting path: /usr/local/lib/obs-plugins/libobs-libfdk.so

info: Attempting path: share/obs/obs-plugins/obs-libfdk/locale/en-US.ini

info: Attempting path: /usr/local/share/obs/obs-plugins/obs-libfdk/locale/en-US.ini

info: Attempting path: ../../obs-plugins/64bit/libobs-x264.so

info: Attempting path: /usr/local/lib/obs-plugins/libobs-x264.so

info: Attempting path: share/obs/obs-plugins/obs-x264/locale/en-US.ini

info: Attempting path: /usr/local/share/obs/obs-plugins/obs-x264/locale/en-US.ini

info: Attempting path: ../../obs-plugins/64bit/libobs-outputs.so

info: Attempting path: /usr/local/lib/obs-plugins/libobs-outputs.so

info: Attempting path: share/obs/obs-plugins/obs-outputs/locale/en-US.ini

info: Attempting path: /usr/local/share/obs/obs-plugins/obs-outputs/locale/en-US.ini

info: Attempting path: ../../obs-plugins/64bit/librtmp-services.so

info: Attempting path: /usr/local/lib/obs-plugins/librtmp-services.so

info: Attempting path: share/obs/obs-plugins/rtmp-services/locale/en-US.ini

info: Attempting path: /usr/local/share/obs/obs-plugins/rtmp-services/locale/en-US.ini

info: Attempting path: ../../obs-plugins/64bit/liblinux-xshm.so

info: Attempting path: /usr/local/lib/obs-plugins/liblinux-xshm.so

info: Attempting path: share/obs/obs-plugins/linux-xshm/locale/en-US.ini

info: Attempting path: /usr/local/share/obs/obs-plugins/linux-xshm/locale/en-US.ini

info: Attempting path: ../../obs-plugins/64bit/liblinux-xcomposite.so

info: Attempting path: /usr/local/lib/obs-plugins/liblinux-xcomposite.so

info: Xcomposite capture plugin loaded
info: Attempting path: share/obs/obs-plugins/linux-xcomposite/locale/en-US.ini

info: Attempting path: /usr/local/share/obs/obs-plugins/linux-xcomposite/locale/en-US.ini

info: Attempting path: ../../obs-plugins/64bit/liblinux-pulseaudio.so

info: Attempting path: /usr/local/lib/obs-plugins/liblinux-pulseaudio.so

info: Attempting path: share/obs/obs-plugins/linux-pulseaudio/locale/en-US.ini

info: Attempting path: /usr/local/share/obs/obs-plugins/linux-pulseaudio/locale/en-US.ini

info: Attempting path: ../../obs-plugins/64bit/liblinux-v4l2.so

info: Attempting path: /usr/local/lib/obs-plugins/liblinux-v4l2.so

info: Attempting path: share/obs/obs-plugins/linux-v4l2/locale/en-US.ini

info: Attempting path: /usr/local/share/obs/obs-plugins/linux-v4l2/locale/en-US.ini

info: output 'default_file_output' (flv_output) created
info: output 'default_stream' (rtmp_output) created
info: encoder 'default_h264' (obs_x264) created
info: encoder 'default_aac' (libfdk_aac) created
info: service 'default_service' (rtmp_custom) created
[New Thread 0x7fffd1a88700 (LWP 6965)]
[Thread 0x7fffd1a88700 (LWP 6965) exited]
[New Thread 0x7fffd1a88700 (LWP 6966)]
info: pulse-input: Server name: 'pulseaudio 4.0'
info: pulse-input: Audio format: s16le, 44100 Hz, 2 channels
info: pulse-input: Started recording from 'alsa_output.pci-0000_00_1b.0.analog-stereo.monitor'
info: source 'Desktop Audio' (pulse_output_capture) created
info: source 'Scene 1' (scene) created
error: Source 'random' not found
error: pulse-input: Failed to get timing info !
error: pulse-input: Failed to get timing info !
error: pulse-input: Failed to get timing info !
error: pulse-input: Failed to get timing info !
error: xcompcap: XCompositeRedirectWindow failed: BadWindow (invalid Window parameter)
info: source 'Xcomposite capture' (xcomposite_input) created
warning: [scene_load_item] Source 20x20 Random Pixel Texture Source (Test) not found!
[New Thread 0x7fffd0c4f700 (LWP 6967)]
[New Thread 0x7fffc3ffe700 (LWP 6968)]
info: Update check: latest version is: 0.4.0
info: source 'Xcomposite capture' destroyed
[New Thread 0x7fffc3752700 (LWP 6969)]
info: source 'Video Capture Device (V4L2)' (v4l2_input) created

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffc3752700 (LWP 6969)]
0x00007ffff5087e3e in ?? () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt full
#0  0x00007ffff5087e3e in ?? () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1  0x00007ffff7bb0e86 in memcpy (__len=<optimized out>, __src=<optimized out>, __dest=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/string3.h:51
No locals.
#2  copy_frame_data_line (y=396, plane=0, src=0x7fffc3751d20, dst=0x7fffb80008e0) at /media/rsnvoice/obs-studio/libobs/obs-source.c:1259
        pos_src = <optimized out>
        pos_dst = <optimized out>
        bytes = <optimized out>
#3  copy_frame_data_plane (lines=<optimized out>, plane=<optimized out>, src=<optimized out>, dst=<optimized out>) at /media/rsnvoice/obs-studio/libobs/obs-source.c:1267
        y = 396
#4  copy_frame_data (src=0x7fffc3751d20, dst=0x7fffb80008e0) at /media/rsnvoice/obs-studio/libobs/obs-source.c:1305
No locals.
#5  cache_video (frame=0x7fffc3751d20) at /media/rsnvoice/obs-studio/libobs/obs-source.c:1315
No locals.
#6  obs_source_output_video (source=0xc6e620, frame=0x7fffc3751d20) at /media/rsnvoice/obs-studio/libobs/obs-source.c:1333
        output = <optimized out>
#7  0x00007fffd1e8b41b in v4l2_thread (vptr=0xc6d6e0) at /media/rsnvoice/obs-studio/plugins/linux-v4l2/v4l2-input.c:254
        fds = {__fds_bits = {536870912, 0 <repeats 15 times>}}
        tv = {tv_sec = 0, tv_usec = 846099}
        buf = {index = 0, type = 1, bytesused = 8009, flags = 1, field = 1, timestamp = {tv_sec = 12355, tv_usec = 166061}, timecode = {type = 0, flags = 0, frames = 0 '\000', 
            seconds = 0 '\000', minutes = 0 '\000', hours = 0 '\000', userbits = "\000\000\000"}, sequence = 0, memory = 1, m = {offset = 0, userptr = 0, planes = 0x0, fd = 0}, 
          length = 233472, reserved2 = 0, reserved = 0}
        r = <optimized out>
        out = {data = {0x7fffd000d000 <error: Cannot access memory at address 0x7fffd000d000>, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, linesize = {640, 0, 0, 0, 0, 0, 0, 0}, 
          width = 640, height = 480, timestamp = 12355166061000, format = VIDEO_FORMAT_YUY2, color_matrix = {1.16438401, 0, 1.79274094, -0.972944975, 1.16438401, -0.213248998, 
            -0.532908976, 0.301483005, 1.16438401, 2.11240196, 0, -1.13340199, 0, 0, 0, 1}, full_range = false, color_range_min = {0.0627451017, 0.0627451017, 0.0627451017}, 
          color_range_max = {0.921568632, 0.941176474, 0.941176474}, flip = false}
        data = 0xc6d6e0
#8  0x00007ffff30db182 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
No symbol table info available.
#9  0x00007ffff50ea30d in clone () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
@fryshorts
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Does your camera work with other programs ? It would be nice if you could check with the qv4l2 test utility if it is able to access the camera via the "Memory mapped I/O" capture method, or whether it uses a different option.

@voice06
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voice06 commented Jul 16, 2014

I'm able to access the camera in qv4l2 via Memory mapped I/O and read(), VLC is also able to access the camera.

@bazukas
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bazukas commented Jul 16, 2014

Hello, could you pastebin output of this command:
v4l2-ctl -d /dev/video0 --list-formats-ext

Replace "/dev/video0" with your device.

@voice06
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voice06 commented Jul 16, 2014 

lsusb output, camera:
Bus 005 Device 002: ID 06f8:3008 Guillemot Corp. 

sudo v4l2-ctl -d /dev/bus/usb/005/002 --list-formats-ext
VIDIOC_QUERYCAP: failed: Inappropriate ioctl for device
ioctl: VIDIOC_ENUM_FMT

v4l2-ctl -d /dev/video0 --list-formats-ext
ioctl: VIDIOC_ENUM_FMT
    Index       : 0
    Type        : Video Capture
    Pixel Format: 'JPEG' (compressed)
    Name        : JPEG
        Size: Discrete 160x120
        Size: Discrete 320x240
        Size: Discrete 640x480

@bazukas
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bazukas commented Jul 16, 2014

Sorry, that pixel format is not supported yet. Still need to fix the crash though.

@voice06
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voice06 commented Jul 30, 2014

Just tested 0.4.2-90-g254b50f-modified with v4l2. It did not crash when I selected the camera so it appears that for now that issue is resolved. Only remaining item would be the lack of JPEG Pixel Format support but I would say thats not as pressing, probably wouldn't hurt to get a new webcam anyways. Closing out the bug report.

@voice06 voice06 closed this as completed Jul 30, 2014
@fryshorts
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Thats good to hear, although the patches merged were supposed to fix the missing JPEG support by providing on the fly transcoding via libv4l2.
If you could post a current log that would be much appreciated.

@voice06
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voice06 commented Jul 31, 2014

Starting program: /usr/local/bin/obs
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7fffe6e9e700 (LWP 4743)]
Attempted path: share/obs/obs-studio/locale/en-US.ini
Attempted path: /usr/local/share/obs/obs-studio/locale/en-US.ini
Attempted path: share/obs/obs-studio/locale.ini
Attempted path: /usr/local/share/obs/obs-studio/locale.ini
Attempted path: share/obs/obs-studio/license/gplv2.txt
Attempted path: /usr/local/share/obs/obs-studio/license/gplv2.txt
[New Thread 0x7fffe6082700 (LWP 4744)]
QObject::connect: invalid null parameter
info: OBS 0.4.2-90-g254b50f-modified (linux)
info: Processor: 8 logical cores
info: Processor: Intel(R) Core(TM) i7-4770 CPU @ 3.40GHz
info: Physical Memory: 15993MB Total
info: Kernel Version: Linux 3.11.0-12-generic
info: Distribution: "Ubuntu" "14.04"
info: audio settings reset:
samples per sec: 44100
speakers: 2
buffering (ms): 1000

[New Thread 0x7fffdffff700 (LWP 4745)]
info: X and Y: 909 480
Backbuffers: 2
Color Format: 3
ZStencil Format: 0
Adapter: 0

info: OpenGL version: 3.2.0 NVIDIA 331.89

info: Created new platform data
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: convert_sampler_info: 1 <= max_anisotropy <= 16 violated, selected: 0, set: 1
info: video settings reset:
base resolution: 1440x900
output resolution: 960x600
fps: 60/1
[New Thread 0x7fffdf1fe700 (LWP 4746)]
[New Thread 0x7fffddbb3700 (LWP 4747)]
error: Required module function 'obs_module_set_pointer' in module '/usr/local/lib/obs-plugins/libimage-source.so' not found, loading of module failed
error: Required module function 'obs_module_set_pointer' in module '/usr/local/lib/obs-plugins/liblinux-pulseaudio.so' not found, loading of module failed
error: Required module function 'obs_module_set_pointer' in module '/usr/local/lib/obs-plugins/liblinux-v4l2.so' not found, loading of module failed
error: Required module function 'obs_module_set_pointer' in module '/usr/local/lib/obs-plugins/liblinux-xcomposite.so' not found, loading of module failed
error: Required module function 'obs_module_set_pointer' in module '/usr/local/lib/obs-plugins/liblinux-xshm.so' not found, loading of module failed
error: Required module function 'obs_module_set_pointer' in module '/usr/local/lib/obs-plugins/libobs-ffmpeg.so' not found, loading of module failed
error: Required module function 'obs_module_set_pointer' in module '/usr/local/lib/obs-plugins/libobs-libfdk.so' not found, loading of module failed
error: Required module function 'obs_module_set_pointer' in module '/usr/local/lib/obs-plugins/libobs-outputs.so' not found, loading of module failed
error: Required module function 'obs_module_set_pointer' in module '/usr/local/lib/obs-plugins/libobs-x264.so' not found, loading of module failed
error: Required module function 'obs_module_set_pointer' in module '/usr/local/lib/obs-plugins/librtmp-services.so' not found, loading of module failed
error: Required module function 'obs_module_set_pointer' in module '/usr/local/lib/obs-plugins/libtest-input.so' not found, loading of module failed
info: Xcomposite capture plugin loaded
info: output 'default_file_output' (flv_output) created
info: output 'default_stream' (rtmp_output) created
info: encoder 'default_h264' (obs_x264) created
info: encoder 'default_aac' (libfdk_aac) created
info: service 'default_service' (rtmp_custom) created
[New Thread 0x7fffcbfff700 (LWP 4748)]
[Thread 0x7fffcbfff700 (LWP 4748) exited]
[New Thread 0x7fffcbfff700 (LWP 4749)]
info: pulse-input: Server name: 'pulseaudio 4.0'
info: pulse-input: Audio format: s16le, 44100 Hz, 2 channels
info: pulse-input: Started recording from 'alsa_output.pci-0000_00_1b.0.analog-stereo.monitor'
info: source 'Desktop Audio' (pulse_output_capture) created
info: source 'Scene 1' (scene) created
info: v4l2-input: Start capture from /dev/video0
info: v4l2-input: Resolution: 640x480
info: v4l2-input: Linesize: 640 Bytes
info: v4l2-input: Framerate: 30.00 fps
[New Thread 0x7fffcb7fe700 (LWP 4750)]
info: source 'Video Capture Device (V4L2)' (v4l2_input) created
[New Thread 0x7fffca60b700 (LWP 4752)]
[New Thread 0x7fffc9e0a700 (LWP 4753)]
info: Update check: latest version is: 0.4.0
info: v4l2-input: Found device 'USB camera' at /dev/video0
info: v4l2-input: Pixelformat: JPEG (unavailable)
info: v4l2-input: Pixelformat: RGB3 (Emulated) (unavailable)
info: v4l2-input: Pixelformat: BGR3 (Emulated) (unavailable)
info: v4l2-input: Pixelformat: YU12 (Emulated) (available)
info: v4l2-input: Pixelformat: YV12 (Emulated) (available)
info: v4l2-input: Stepwise and Continuous framerates are currently hardcoded
info: v4l2-input: Stepwise and Continuous framerates are currently hardcoded
info: v4l2-input: Stepwise and Continuous framerates are currently hardcoded

NOTE: There was a recent motherboard/cpu change as well, that could have resolved the segault issue.

@voice06
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voice06 commented Jul 31, 2014

....and now its working. I swear I come across some of the weirdest issues.

Gol-D-Ace pushed a commit to Gol-D-Ace/obs-studio that referenced this issue Feb 20, 2021
@borzun
Fix data race when stop stream during connection (obsproject#184)
020070b 
Fix a data race when user manually stopped stream during connecting to a RTMP server.

This is caused by a data race in `obs_output_destroy` method, which call `rtmp_stream_destroy` method before output became active. In such case, the `rtmp_stream_destroy` method will detach `end_data_capture` thread, thus it will result in a potential crash. In order to avoid this, the thread which destroys output should wait till `end_data_capture` will be finished.
palana pushed a commit to amazon-contributing/upstreaming-to-obs-studio that referenced this issue Mar 15, 2024
@jhnbwrs
Merge pull request obsproject#184 from amazon-contributing/jhbwrs/cap…
951282a 
…tions_fixes

libobs: Support for multitrack, av1, and hevc captions
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3 participants
@bazukas @voice06 @fryshorts