I have an audio stream
cvlc -vvv alsa://hw:1,0 --sout '#transcode{acodec=mp3,ab=128}:standard{access=http,mux=ogg,dst=192.168.0.106:8081}'
and it works if i logged in KDE, but if i see login window (where you need to type password kde login) i cannot open alsa device.
I got
vlc cannot open MRL 'alsa://hw:1,0'.
Is it possible to have access to alsa without login to KDE?
Any suggestions are welcomed.
alsa is KDE independent; before logging in, from a console (ctrl+alt+F1) use this command: aplay -l, it will show all audio devices; I think kde has some script to change the soundcard stack
Related
I'm trying to capture a video using vlc.
The procedure is standard using the GUI :
enter the url e.g http://some_site_some_video.mp4/playlist.m3u8 in the network protocol capture device tool (ctrl+n) in the next screen enter the path so save the file and that's it.
Tried using VLC docs, and the closest command I found was vlc -I dummy -vvv input_stream --sout
but
vlc -I dummy -vvv http://some_site_some_video.mp4/playlist.m3u8 --sout home/me/videos
Didn't work.
Is it the right command to use?
I am using ubuntu16.04 and trying to run opencv script.
when i use:
video_capture = cv2.VideoCapture(-1)
it gives me error VIDEOIO ERROR: V4L: can't find camera device
No video window opens
But when i run
video_capture = cv2.VideoCapture('test.jpg')
It opens window shows the picture and close the window.
Please tell me why it is not streaming video directly from camera.
The suggestion api55 gave in his comment
video_capture = cv2.VideoCapture(0)
is what I would try first.
Generally, you can list the available cameras with ls /dev/video* or v4l2-ctl --list-devices. Here sample output:
NZXT-U:rt-trx> v4l2-ctl --list-devices
Microsoft® LifeCam Cinema(TM): (usb-0000:00:14.0-1):
/dev/video1
Microsoft® LifeCam Cinema(TM): (usb-0000:00:1a.0-1.3):
/dev/video0
/dev/video0 corresponds to device id 0, etc.
PS: v4l2-ctl is quite useful for solving camera issues and can do much more than --list-devices. I installed it via packagev4l-utils on a 16.04 machine.
Late, but to get mine working i put in terminal:
-ltrh /dev/video*
To get a list of the video devices that are plugged into my computer. Then for each one I did:
sudo chmod 777 /dev/videox
Where x was one of the video files that were listed, giving everything access to them. Probaly not the most secure solution, but it got my code working.
I have a physical box with QNX 6.3.0 installed. PS/2 mice and keyboard work fine. I'm trying to see if I can get a USB mouse going. What info I could find seemed to say I should start with:
usb -vvv
However, I get this:
$ usb
/bin/sh: usb: not found
Where's the usb utility supposed to be installed at, and why is it not found? Isn't it supposed to be a default utility?
I think you should try for :
cd /fs/usb0 In my case this usb0 is the desired name . you can change accordingly .
I have a problem with recording rtsp stream with VLC player. Actually my method works in MacOS X, but doesn't in Windows. Command line:
vlc -vvv rtsp://admin:admin#192.168.0.151/live/h264/ --sout="#transcode{vcodec=mp4v,vfilter=canvas{width=800,height=600}}:std{access=file,mux=mp4,dst=C:\123.mp4}"
On MacOS it works fine, but under Windows it creates unreadable file. MediaInfo output:
General
Complete name : C:\123.mp4
Format : MPEG-4
Format profile : Base Media
Codec ID : isom
File size : 1.08 MiB
Any suggestions?
Seems like your destination URL is not correct. Try this:
vlc -vvv rtsp://admin:admin#192.168.0.151/live/h264/ --sout="#transcode{vcodec=mp4v,vfilter=canvas{width=800,height=600}}:std{access=file,mux=mp4,dst=C:\\123.mp4}"
For Linux users, ffmpeg alone works straight away.
If you want to watch the stream while recording, write to a .mkv instead of a .mp4.
This example will overwrite the file video.mp4 in your home folder without asking due to the -y param, and the original codecs are kept.
ffmpeg -i rtsp://192.168.42.1/live -vcodec copy -acodec copy -y ~/video.mp4
NB: This example url is for an Ambarella Xiaomi Mijia 4K camera, like many wifi ip cameras, you have to activate the stream via telnet first, for this particular model the command to be sent before reading the stream via rtsp://:
echo '{"msg_id":257,"token":0}' | telnet 192.168.42.1 7878
Why won't this produce a file? It does everything right but saving to an actual file .. I am using Linux, Vlc 1.1.9, compiled without skins2, qt or ncurses interfaces...
vlc :sout=#transcode{vcodec=mp4,acodec=mp4a,vb=800,scale=1}:std{access=file,mux=mp4,dst="~/file.mp4"} screen:// screen-fps=12 screen-caching=100
Note this also does the same thing - shows the screen:// fine, but will not output to a file:
vlc :sout=#transcode{vcodec=h264,acodec=none,vb=800}:std{access=file,mux=avi,dst="/root/file.avi"} screen:// screen-fps=12 screen-caching=100
Try this
vlc -vvv (PORT (UDP, HTTP)) --ts-dump-file video.ts and add more commands
vlc -vvv (PORT (UDP, HTTP)) --sout-all file/ogg,mpg,ts:filename and add more commands
Thats above code shuld work!