I also have the same prob of youtube vdos not playing over cellular but works perfect over wifi, i hav seen the youtube app takes it to the browser nd the vdo link to the rtsp instead of http....the unable to play vdo error shows up so i hav tried deleting the wap2 transport file from the options>device>advanced settings>service book now it says " the apn is not configured properly. to stream media please configure the APN.
I think it's network dependant coz I have no issues. Yes the rtsp streams may not work but when I open youtube therez a play button right in the middle of the vid that when I click starts playing the vid. Uses data yes but if one has data bundles then your credit will be used or if you have access to wi fi then lucky you. No apn setup on my side to force everything to go through BIS.
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