ffplay 播放 USB camera

1. ls /dev/video*

strong@foreverstrong:~$ ls /dev/video*
/dev/video0
strong@foreverstrong:~$

2. ffplay /dev/video0

strong@foreverstrong:~$ ffplay /dev/video0
ffplay version 2.8.14-0ubuntu0.16.04.1 Copyright (c) 2003-2018 the FFmpeg developersbuilt with gcc 5.4.0 (Ubuntu 5.4.0-6ubuntu1~16.04.9) 20160609configuration: --prefix=/usr --extra-version=0ubuntu0.16.04.1 --build-suffix=-ffmpeg --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --cc=cc --cxx=g++ --enable-gpl --enable-shared --disable-stripping --disable-decoder=libopenjpeg --disable-decoder=libschroedinger --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmodplug --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libpulse --enable-librtmp --enable-libschroedinger --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxvid --enable-libzvbi --enable-openal --enable-opengl --enable-x11grab --enable-libdc1394 --enable-libiec61883 --enable-libzmq --enable-frei0r --enable-libx264 --enable-libopencvlibavutil      54. 31.100 / 54. 31.100libavcodec     56. 60.100 / 56. 60.100libavformat    56. 40.101 / 56. 40.101libavdevice    56.  4.100 / 56.  4.100libavfilter     5. 40.101 /  5. 40.101libavresample   2.  1.  0 /  2.  1.  0libswscale      3.  1.101 /  3.  1.101libswresample   1.  2.101 /  1.  2.101libpostproc    53.  3.100 / 53.  3.100
Input #0, video4linux2,v4l2, from '/dev/video0':B sq=    0B f=0/0   Duration: N/A, start: 457490.262840, bitrate: 147456 kb/sStream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 640x480, 147456 kb/s, 30 fps, 30 tbr, 1000k tbn, 1000k tbc
457509.53 M-V:  0.003 fd=   0 aq=    0KB vq=    0KB sq=    0B f=0/0
strong@foreverstrong:~$

3. dbus[10965]: arguments to dbus_message_new_method_call() were incorrect, assertion “path != NULL” failed in file …/…/…/dbus/dbus-message.c line 1362.

deepnorth@deepnorth-desktop:~$ ll /dev/video*
crw-rw----+ 1 root video 81, 0 1月   9 13:58 /dev/video0
deepnorth@deepnorth-desktop:~$

deepnorth@deepnorth-desktop:~$ ffplay /dev/video0
ffplay version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2003-2019 the FFmpeg developersbuilt with gcc 7 (Ubuntu/Linaro 7.3.0-16ubuntu3)configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/aarch64-linux-gnu --incdir=/usr/include/aarch64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-sharedlibavutil      55. 78.100 / 55. 78.100libavcodec     57.107.100 / 57.107.100libavformat    57. 83.100 / 57. 83.100libavdevice    57. 10.100 / 57. 10.100libavfilter     6.107.100 /  6.107.100libavresample   3.  7.  0 /  3.  7.  0libswscale      4.  8.100 /  4.  8.100libswresample   2.  9.100 /  2.  9.100libpostproc    54.  7.100 / 54.  7.100
dbus[10965]: arguments to dbus_message_new_method_call() were incorrect, assertion "path != NULL" failed in file ../../../dbus/dbus-message.c line 1362.
This is normally a bug in some application using the D-Bus library.D-Bus not built with -rdynamic so unable to print a backtrace
Aborted (core dumped)
deepnorth@deepnorth-desktop:~$

To fix it, run

sudo dbus-uuidgen > /var/lib/dbus/machine-id

If you don’t have dbus-uuidgen , it’s in the dbus package, which can be installed by issuing yum install dbus.

References

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ffplay 播放 USB camera

ffplay 播放 USB camera

1. ls /dev/video*

2. ffplay /dev/video0

3. dbus[10965]: arguments to dbus_message_new_method_call() were incorrect, assertion “path != NULL” failed in file …/…/…/dbus/dbus-message.c line 1362.

References

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