Problem with playing some HLS streams in WebOS

I’ve created an app, which connects to an IPTV service. There are some streams to play. Some play normally, some don’t. Problematic streams have either only audio with no picture, or doesn’t play at all. I’m using hls.js to play the streams.

There’s another app in LG market which runs on the same TV. When we connect that app to our service (same streams), the app plays those problematic streams correctly! That’s also a web app.

Native player also does not work. I follow the same instructions here. Does not work.

I searched the web for days. Couldn’t find the solution. Any help is appreciated.

Please refer to Media Playback sample app. Streaming Protocol and DRM and Video and Audio Format will also be helpful. Thank you.