[SOLVED] AVURLAsset tracks is empty, but video/audio is playable

AVURLAsset tracks is empty, but video/audio is playable

I have video that lives here:

http://195.16.112.71/adaptive/66aebabb-2632-44fc-abf1-df29bca6b941.video/66aebabb-2632-44fc-abf1-df29bca6b941.m3u8

Ffmpeg says that this video has 5 tracks and it's correctly.

But if I use AVURLAsset with that link it says me that there isn't any tracks:

NSArray* const tracks = asset.tracks; // it's empty

I modified Apple's StichedStreamPlayer sample to reproduce this problem, it lies here: https://yadi.sk/d/hV3jfbx1Z9sfC

Simply click 'Load Movie', than the 'Play' button - movie plays perfectly, but if you check tracks variable in prepareToPlayAsset function you find it's empty. The question is: why it's empty if in reality the video has 5 tracks and how this video could be playing if no tracks exist, as AVURLAsset says?

Thanks for your help in advance!

Solution

If you are directly streaming the video then it won't have tracks. You can download the file and ask for the tracks of the video file asset.