No sound when I connect my Macbook pro (2012) to TV via HDMI!

Hi! I have a problem with the sound when I connect my Macbook pro (bought in 2012) to a Phillips HD TV. The strange thing is that it only happens with some videos (specially youtube videos) but the sound works perfectly with films and audio files I have in my computer, and also when I watch TV online (Eurosport player for instance and other similar applications). It's even stranger because it doesn't happen all the time; last week I tried many times to watch some youtube videos and after unplugging the HDMI cable it seemed to work. As I said, with Eurosport player and many films downloaded in my macbook I don't have this problem (sound is ok all the time), and this is why I'm really confused. I suppose it's not a connection problem, otherwise I wouldn't have sound in any video, right? I've tried two different HDMI's cables but nothing has changed. Please, someone help me, as I can't figure out what's happening. Thank you very much!

Well Im not sure what the fix is for your problem, but can you please open up the sound preference next time you connect the philips tv, and make sure that sound output is set to hdmi out. Then try and play your video's etc and see if they are affected. 
I can tell you I get a similar problem when, for example, I have a youtube window open and then connect the external display. The youtube video will not sound out through the cable, however if i refresh the window it works. Also the same when I use bluray player on mac, I have to close it and open it again for the sound to output through the external monitor.

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