用 VLC 播放 webcam 及用 ffmpeg 直播 YouTube
先列出哪些可以播放的 webcam
root@liho:~# v4l2-ctl --list-devices
UHD4K: UHD4K (usb-0000:00:14.0-7):
/dev/video0
/dev/video1
/dev/media0查看詳細資訊
root@liho:~# v4l2-ctl --info --device /dev/video0
Driver Info:
Driver name : uvcvideo
Card type : UHD4K: UHD4K
Bus info : usb-0000:00:14.0-7
Driver version : 5.15.111
Capabilities : 0x84a00001
Video Capture
Metadata Capture
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x04200001
Video Capture
Streaming
Extended Pix Format
Media Driver Info:
Driver name : uvcvideo
Model : UHD4K: UHD4K
Serial : 01.00.00
Bus info : usb-0000:00:14.0-7
Media version : 5.15.111
Hardware revision: 0x00000001 (1)
Driver version : 5.15.111
Interface Info:
ID : 0x03000002
Type : V4L Video
Entity Info:
ID : 0x00000001 (1)
Name : UHD4K: UHD4K
Function : V4L2 I/O
Flags : default
Pad 0x01000007 : 0: Sink
Link 0x02000013: from remote pad 0x100000a of entity 'Extension 4': Data, Enabled, Immutable
root@liho:~# v4l2-ctl --info --device /dev/video1
Driver Info:
Driver name : uvcvideo
Card type : UHD4K: UHD4K
Bus info : usb-0000:00:14.0-7
Driver version : 5.15.111
Capabilities : 0x84a00001
Video Capture
Metadata Capture
Streaming
Extended Pix Format
Device Capabilities
Device Caps : 0x04a00000
Metadata Capture
Streaming
Extended Pix Format
Media Driver Info:
Driver name : uvcvideo
Model : UHD4K: UHD4K
Serial : 01.00.00
Bus info : usb-0000:00:14.0-7
Media version : 5.15.111
Hardware revision: 0x00000001 (1)
Driver version : 5.15.111
Interface Info:
ID : 0x03000005
Type : V4L Video
Entity Info:
ID : 0x00000004 (4)
Name : UHD4K: UHD4K
Function : V4L2 I/O用 arecord & aplay 指令查看聲音輸入
root@liho:~# arecord -l
**** List of CAPTURE Hardware Devices ****
card 1: UHD4K [UHD4K], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
root@liho:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 8: HDMI 2 [HDMI 2]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 9: HDMI 3 [HDMI 3]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 10: HDMI 4 [HDMI 4]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 11: HDMI 5 [HDMI 5]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 12: HDMI 6 [HDMI 6]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 13: HDMI 7 [HDMI 7]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 14: HDMI 8 [HDMI 8]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 15: HDMI 9 [HDMI 9]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 16: HDMI 10 [HDMI 10]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 17: HDMI 11 [HDMI 11]
Subdevices: 1/1
Subdevice #0: subdevice #0測試錄音
# ffmpeg -f alsa -i hw:1,0 -t 5 testmic.mp3用 vlc 命令列直接把 webcam 導入 播放
$ vlc v4l2:///dev/video0用 ffmpeg 指令直播到 youtube
# ffmpeg -threads 8 -f v4l2 -i /dev/video0 -f alsa -i hw:1,0 -preset ultrafast -tune zerolatency -c:v libx264 -pix_fmt yuv420p -framerate 24 -g 30 -b:v 4500k -c:a aac -b:a 128k -ar 44100 -ac 2 -f flv -flvflags no_duration_filesize rtmp://a.rtmp.youtube.com/live2/xxxxxxxxxx在 ffmpeg 內要加入時間戳記 多加入 -vf 參數
-vf "drawtext=fontfile=/usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf: text='%{localtime}': fontcolor=white@0.75: fontsize=36: x=10: y=10"