I can't duplicate the slowness. I tried 32-bit Karmic and 64-bit Lucid (both virtual machines) on an Intel i7-860. Avidemux took 1:15 minutes in Karmic and Lucid took 1:32 with both using the same clip and both exporting to MPEG-4 AVC (x264)/Audio copy in MP4.
Originally Posted by orionds
As for x264 itself. I opened two terminals and in one:
In the other terminal:
sudo apt-get install mplayer
mplayer input.foo -vo yuv4mpeg:file=video.y4m -nosound -ao null -noframedrop -ni
Karmic took 1:48 minutes and Lucid took 1:54 minutes to encode. I guess that the time difference is due to Karmic's x264 being older and the default settings between the two x264 versions probably vary.
time x264 --threads auto --crf 26 video.y4m -o output.264
Update: More numbers, but this time comparing today's x264 that I compiled. Karmic 2:19 minutes and Lucid 1:56 minutes.