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Choppy video on Youtube

Hi all,

First, I'm asking for help on this list because I've observed this to be a very august group :) and I'm actually a bit in awe to be in the presence of Debian developers...  I've only been using Debian for a few weeks -- I'm not new to Linux or Unix, although I'm still a relative beginner.

Here's my problem -- when I stream certain videos on Youtube, I consistently get choppy playback performance, whereby the video freezes and restarts randomly, with the audio getting out of sync from that point forward.  The problem is NOT due to the video still being downloaded -- I know this because the progress bar shows that the download is way ahead of my viewing progress.

Here are my specs:

- Debian Jessie 32-bit (I had installed 8.3 and subsequently ran some updates, but I don't know how to check to see if I'm up to 8.4)
- Gnome 3
- Firefox 45.0.1
- Flash is NOT installed
- flashplugin-nonfree is NOT installed
- neither gnash nor pepper are installed
- example of a video that gets choppy: https://www.youtube.com/watch?v=R6Tok9KUjTw (the problem seems to start during the "man on the street" segments)
- When the choppiness is happening, System Monitor tells me that one of my four CPUs is maxing out at 100% at least half the time

​- Dell Inspiron 15 3000 Series (Intel(R)) - 3551
- Intel Pentium CPU N3540 @ 2.16GHz x 4 (2M Cache, up to 2.66 GHz)
- 4GB Single Channel DDR3L 1600MHz (4GBx1)
- Graphics: Intel Bay Trail x86/MMX/SSE2

I would love to receive help from this list...  thanks much much in advance!


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