The VideoLAN Forums

Posted: **13 Apr 2015 14:04**

Hello,

I have trouble with the deploiement of a example on my computer.

I use that code:

     
     m = libvlc_media_new_path(inst, "v4l2:///dev/video0");
    /* Create a media player playing environement */
    mp = libvlc_media_player_new_from_media (m);

    libvlc_media_player_play(mp);

When I launch the program on my first computer the video source works properly. But on my second computer I get that error:

Code: Select all

[0xae002948] filesystem access error: cannot open file /home/xxxxx/xxxx/v4l2:///dev/video0 (No such file or directory)
[0xae002948] main access error: File reading failed
[0xae002948] main access error: VLC could not open the file "/home/xxxxx/xxxx/v4l2:///dev/video0" (No such file or directory).
[0x87d4d20] main input error: open of `file:///home/xxxxx/xxxx/%20%20%20v4l2%3A///dev/video0' failed
[0x87d4d20] main input error: Your input can't be opened
[0x87d4d20] main input error: VLC is unable to open the MRL 'file:///home//xxxxx/xxxx/%20%20%20v4l2%3A///dev/video0'. Check the log for details.

I don't understand why the program add "/home/xxxxx/xxxx/" before v4l2:///dev/video0 .

Can someone give me a hand?

Best regard.

Posted: **13 Apr 2015 14:29**

Please read the LibVLC Doxygen.

Posted: **14 Apr 2015 09:31**

Thank you for the answer.

I looked at the documentation but I get:

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LIBVLC_API libvlc_media_t* libvlc_media_new_path 	( 	libvlc_instance_t *  	p_instance,
		const char *  	path 
	) 		

Create a media for a certain file path.

See Also
    libvlc_media_release

Parameters
    p_instance	the instance
    path	local filesystem path

Returns
    the newly created media or NULL on error

path is the local filesystem path but I don't understand why on my firstcomputer where I compile the program the libvlc is well used but in the second computer the compiled program works wong?

Posted: **14 Apr 2015 23:48**

v4l2:///dev/video0 is not a path, but a MRL.

Posted: **16 Apr 2015 09:10**

Thank you for the answer but I still dont understand why a path is added before v4l2:///dev/video0 ?

Posted: **20 Apr 2015 21:37**

Because you called libvlc_media_new_path and not libvlc_media_new_location

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