I agree, the HTML5 videos (mainy YouTube) are horrible: eats CPU like crazy and going to fullscreen stutters. I didn't find any usable parameter at chrome but at least found a dirty workaround, which lucky works for me and fallbacks HTML5 videos to Flash.

I just deleted one of Chrome libraries ffmpegsumo.so:

1. Quit Chrome
2. Make a backup copy of your Chrome
3. Remove the library

My-MBP:~ jhartman$ cd '/Users/jhartman/Tools/Internet/Google Chrome.app/'
My-MBP:Google Chrome.app jhartman$ find . -name  *ffmpegsumo*
./Contents/Versions/35.0.1916.86/Google Chrome Framework.framework/Libraries/ffmpegsumo.so
./Contents/Versions/35.0.1916.99/Google Chrome Framework.framework/Libraries/ffmpegsumo.so
My-MBP:Google Chrome.app jhartman$ rm "./Contents/Versions/35.0.1916.86/Google Chrome Framework.framework/Libraries/ffmpegsumo.so"
My-MBP:Google Chrome.app jhartman$ rm "./Contents/Versions/35.0.1916.99/Google Chrome Framework.framework/Libraries/ffmpegsumo.so"

4. Start Chrome

Works like charm (at least - for me...).

Best regards, Jarek

I agree, the HTML5 videos (mainy YouTube) are horrible: eats CPU like crazy and going to fullscreen stutters. I didn't find any usable parameter at chrome but at least found a dirty workaround, which lucky works for me and fallbacks HTML5 videos to Flash.

I just deleted one of Chrome libraries ffmpegsumo.so:

1. Quit Chrome

2. Make a backup copy of your Chrome

3. Remove the library

    My-MBP:~ jhartman$ cd '/Users/jhartman/Tools/Internet/Google Chrome.app/'
    My-MBP:Google Chrome.app jhartman$ find . -name  *ffmpegsumo*
    ./Contents/Versions/35.0.1916.86/Google Chrome Framework.framework/Libraries/ffmpegsumo.so
    ./Contents/Versions/35.0.1916.99/Google Chrome Framework.framework/Libraries/ffmpegsumo.so
    My-MBP:Google Chrome.app jhartman$ rm "./Contents/Versions/35.0.1916.86/Google Chrome Framework.framework/Libraries/ffmpegsumo.so"
    My-MBP:Google Chrome.app jhartman$ rm "./Contents/Versions/35.0.1916.99/Google Chrome Framework.framework/Libraries/ffmpegsumo.so"
   

4. Start Chrome

Works like charm (at least - for me...).