I doubt that this verbose log helps much, but here you go... This is with a Trust 17676 webcam (145f:019f) on Debian 8 (guvcview 2.0.1+debian-1). $ guvcview --verbosity=2 GUVCVIEW: couldn't open /home/.../.config/guvcview2/video0 for read: No such file or directory GUVCVIEW: language catalog=> dir:/usr/share/locale type:(null) cat:guvcview.mo GUVCVIEW: main thread (tid: 879) V4L2_CORE: Device Node Path: /dev/video0 VID/PID: 145f 019f Novatek Trust Webcam serial: (null) busnum: 3 devnum: 3 V4L2_CORE: language catalog=> dir:/usr/share/locale type:(null) cat:gview_v4l2core.mo V4L2_CORE: capture method mmap (1) V4L2_CORE: video device: /dev/video0 V4L2_CORE: mapping control for Pan (relative) V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory V4L2_CORE: mapping control for Tilt (relative) V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory V4L2_CORE: mapping control for Pan Reset V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory V4L2_CORE: mapping control for Tilt Reset V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory V4L2_CORE: mapping control for Focus V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory V4L2_CORE: mapping control for LED1 Mode V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory V4L2_CORE: mapping control for LED1 Frequency V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory V4L2_CORE: mapping control for Disable video processing V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory V4L2_CORE: mapping control for Raw bits per pixel V4L2_CORE: (UVCIOC_CTRL_MAP) Error: No such file or directory V4L2_CORE: Init. Trust Webcam (location: usb-0000:00:1a.7-2) { pixelformat = 'YUYV', description = 'YUV 4:2:2 (YUYV)' } { discrete: width = 640, height = 480 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 160, height = 120 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 176, height = 144 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 320, height = 240 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 352, height = 288 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 1280, height = 720 } Time interval between frame: 1/10, 2/15, { discrete: width = 1920, height = 1080 } Time interval between frame: 1/5, { pixelformat = 'MJPG', description = 'MJPEG' } { discrete: width = 640, height = 480 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 160, height = 120 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 176, height = 144 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 320, height = 240 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 352, height = 288 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 1280, height = 720 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 1920, height = 1080 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { pixelformat = 'RGB3', description = 'RGB3' } { discrete: width = 640, height = 480 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 160, height = 120 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 176, height = 144 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 320, height = 240 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 352, height = 288 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 1280, height = 720 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 1920, height = 1080 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { pixelformat = 'BGR3', description = 'BGR3' } { discrete: width = 640, height = 480 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 160, height = 120 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 176, height = 144 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 320, height = 240 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 352, height = 288 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 1280, height = 720 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 1920, height = 1080 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { pixelformat = 'YU12', description = 'YU12' } { discrete: width = 640, height = 480 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 160, height = 120 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 176, height = 144 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 320, height = 240 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 352, height = 288 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 1280, height = 720 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 1920, height = 1080 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { pixelformat = 'YV12', description = 'YV12' } { discrete: width = 640, height = 480 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 160, height = 120 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 176, height = 144 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 320, height = 240 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 352, height = 288 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 1280, height = 720 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, { discrete: width = 1920, height = 1080 } Time interval between frame: 1/30, 1/20, 1/15, 1/10, 2/15, V4L2_CORE: checking muxed H264 format support V4L2_CORE: (libusb) checking for H264 unit id control[0]:(int) 0x980900 'Brightness' min:-128 max:127 step:1 def:0 curr:0 control[1]:(int) 0x980901 'Contrast' min:60 max:255 step:1 def:128 curr:0 control[2]:(int) 0x980902 'Saturation' min:0 max:200 step:1 def:100 curr:0 control[3]:(int) 0x980903 'Hue' min:-128 max:127 step:1 def:0 curr:0 control[4]:(bool) 0x98090c 'White Balance Temperature, Auto' def:1 curr:0 control[5]:(menu) 0x980918 'Power Line Frequency' min:0 max:2 def:1 curr:0 menu[0]: [0] -> 'Disabled' menu[1]: [1] -> '50 Hz' menu[2]: [2] -> '60 Hz' control[6]:(int) 0x98091a 'White Balance Temperature' min:2500 max:6500 step:1 def:4500 curr:0 control[7]:(int) 0x98091b 'Sharpness' min:0 max:100 step:1 def:50 curr:0 control[8]:(int) 0x98091c 'Backlight Compensation' min:0 max:1 step:1 def:0 curr:0 control[9]:(menu) 0x9a0901 'Exposure, Auto' min:0 max:3 def:3 curr:0 menu[0]: [1] -> 'Manual Mode' menu[1]: [3] -> 'Aperture Priority Mode' control[10]:(int) 0x9a0902 'Exposure (Absolute)' min:2 max:5000 step:1 def:156 curr:0 control[11]:(int) 0x9a090a 'Focus (absolute)' min:0 max:50 step:1 def:0 curr:0 control[12]:(bool) 0x9a090c 'Focus, Auto' def:1 curr:0 GUVCVIEW: setting video codec to 'dx50' GUVCVIEW: setting audio codec to 'mp2' GUVCVIEW: basename for my_video.mkv is my_video.mkv GUVCVIEW: extension for my_video.mkv is mkv GUVCVIEW: basename for my_photo.jpg is my_photo.jpg GUVCVIEW: extension for my_photo.jpg is jpg ALSA lib confmisc.c:768:(parse_card) cannot find card '0' ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory ALSA lib confmisc.c:1251:(snd_func_refer) error evaluating name ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory ALSA lib conf.c:4738:(snd_config_expand) Evaluate error: No such file or directory ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM sysdefault ALSA lib confmisc.c:768:(parse_card) cannot find card '0' ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory ALSA lib confmisc.c:1251:(snd_func_refer) error evaluating name ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory ALSA lib conf.c:4738:(snd_config_expand) Evaluate error: No such file or directory ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM sysdefault ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.front ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround21 ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround21 ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround40 ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround41 ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround50 ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround51 ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround71 ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958 ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958 ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958 ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline ALSA lib confmisc.c:768:(parse_card) cannot find card '0' ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory ALSA lib confmisc.c:1251:(snd_func_refer) error evaluating name ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory ALSA lib conf.c:4738:(snd_config_expand) Evaluate error: No such file or directory ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM default ALSA lib confmisc.c:768:(parse_card) cannot find card '0' ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory ALSA lib confmisc.c:1251:(snd_func_refer) error evaluating name ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory ALSA lib conf.c:4738:(snd_config_expand) Evaluate error: No such file or directory ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM default ALSA lib confmisc.c:768:(parse_card) cannot find card '0' ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory ALSA lib confmisc.c:1251:(snd_func_refer) error evaluating name ALSA lib conf.c:4259:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory ALSA lib conf.c:4738:(snd_config_expand) Evaluate error: No such file or directory ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM dmix Cannot connect to server socket err = No such file or directory Cannot connect to server request channel jack server is not running or cannot be started ---------------------------------------------- Segmentation fault