The VideoLAN Forums

Hi,


Is it possible to change the aspect ratio of vlc rendering video dynamically?

Isn't that what the 'A' hotkey does? libvlc_video_set_aspect_ratio() should do the same programmatically.

I tried with this method. but no effect.
I tried with libvlc_video_resize() method also. still no effect.

I use libvlc_video_set_aspect_ratio, and it works perfectly, the ratio change dynamically.

Could you please send your code for testing.

libvlc_video_set_aspect_ratio(p_media_player, value, ref p_exception)
The value must be something like "4:3", "16:9", "16:10", ...

I tried with this method. but no effect.
I tried with libvlc_video_resize() method also. still no effect.

You didn't mention which vout you're using but in the case of vmem, libvlc_video_set_aspect_ratio() isn't handled within the module (via the Control() callback). From what I can gather it's assumed you'll perform ratio adjustment within your application. At least that's what I do.

Hi Michael,

Thanks for your reply. Actually my requirement is, fit the video to the viewing window size.
Initially, i set the aspect ratio as " --aspect-ratio=width:height " .
This option is passed to libvlc_new(). so, for the first time the video is fitted into the viewing window size.
Once if i change the window size by doing maximize and minimize, the viewing window height and width will be changed.
Now i need to set the aspect ratio to the new window size. For that, i called the method libvlc_video_set_aspect_ratio() with the option of "--aspect-ratio=new width:new height" . After calling this method also, the video is not fitted into the viewing window size.The initial aspect ratio was maintained. This is my problem.

hmm, you meant custom aspect ratios.
I know it's possible to add custom ratios with "--custom-aspect-ratios", but i don't know if it works dynamically.

Is it possible to call libvlc_media_add_option() method dynamically i.e, while playing the video.

I think it will only affect the media object, and not what is currently being played.
I guess the media needs to be reassigned to the player and restarted. (someone, correct me if i am wrong).

XilasZ, that's correct.