Unknown AAC 2 channels

I have added this channel to an m3u file and open it with the simple IPTV addon.
I get an excellent picture but most of the time no sound.
When I open the audio settings in kodi I see the following message:
Unknown AAC 2 channels (1/1).

So I tried the following in TVheadend:
pipe:///usr/bin/ffmpeg -i “https://d3cglye48cl6m2.cloudfront.net/out/v1/563ec3e9487340528616d736e1202232/index.mpd” -c:v copy -c:a aac -b:a 128k -f mpegts pipe:1

This works, but the video output is often jerky, if visible at all. And there are also audio synchronization problems.

Does anyone know what causes this audio problem in the simple IPTV add-on.
Is there anyway to solve this?