libvlc_video_set_track

[Hildor]

I used tutuorial and video starts playing, but libvlc_video_set_track function does not work or I misunderstand something.

Code: Select all

libvlc_video_get_track_count(mp); // returns 2 libvlc_video_get_track(mp); // returns 1 libvlc_video_set_track(mp, 1); // returns -1 // libvlc_video_set_track(mp, 2) - does the same error meessage libvlc_errmsg(); // returns "Video track number out of Range"

Can someone explain why track changing failed.

[mangokm40]

Maybe the 2 tracks are track 0 and track 1. You can try libvlc_video_set_track(mp, 0);

[Hildor]

Yes libvlc_video_set_track(mp, 0) returns 0, but it doesn't change the track.
Video file has two traks prooved by libvlc_video_get_track_count, if we assume that track numbers starting from 0 or 1(no matter), than libvlc_video_set_track(mp, 1) must succeed.

P.S. Oh and sorry for my bad english.

[mangokm40]

So you tried this sequence, with these results?

libvlc_video_get_track_count(mp); // returns 2
libvlc_video_get_track(mp); // returns 1
libvlc_video_set_track(mp, 0); // returns 0
libvlc_video_set_track(mp, 1); // returns -1

[Hildor]

Yes

[XilasZ]

That's because libvlc_video_set_track wants the track ID, not its index.
You can get it using libvlc_video_get_track_description.

All other get/set track functions use the index, including libvlc_video_get_track.

PS: i know it's weird, nobody took the time to fix it (me included). Maybe i'll fix it someday