thank you for reply

better investigation with vlc , i can say ... channels with problems are :

Video : H264 - MPEG-4 AVC (part 10) - 1920x1080
Audio : MPEG AAC Audio (mp4a) - 48000 Hz

instead working ones are :

Video : H264 - MPEG-4 AVC (part 10) - 1270x720
Audio : MPEG AAC Audio (mp4a) - 44100 Hz

Could be a reason of 'too hig request' ? i tried to install gst plugin videoscale but can't install no pack for openpli4.0