I use an AMD Phenom II X2 550 (3.1ghz) and Radeon HD3300(no 3d acceleration).
Theora has the lowest CPU usage of all, around 35% of my CPU against 40-45
for H264 and VP8 in 1080p. Ffmpeg is the only CLI VP8 encoder available on
Trisquel but it does not have helpful arguments, even -sameq produces lower
quality video for me. I then prefer Arista (with custom parameters) or
OggConvert for this task.
The killer feature of the ogg container however is the Kate subtitles. Having
multiple subtitles inside the video without having to re-encode it again
seems amazing. You can do this in VP8 but you need the ogg container.
And I do not know much about browser playback.
