dvdkhlng at gmx.de
Thu Apr 21 09:59:15 EDT 2011
got the hardware-scaler of the nanonote's CPU work with mplayer. This
means that you can now easily get full-framerate, full-screen video
playback by using less-than full-screen video and having the hardware
scale it without using any CPU cycles.
If you want to give it a try, install mplayer package from here:
Then download that vidix driver and put it to /usr/lib/ :
Here is a demo-video, encoded at 224x144 that plays back fine for me
(this is a version of the famous Big Buck Bunny opensource movie):
mplayer bbb.ogv -vo fbdev:vidix -fs
This currently suffers from a Theora demuxing bug in mplayer, making the
video stop sometimes. Use the arrow keys to skip over these locations
(currently trying to upgrade the mplayer package to a more recent
For audio to be at correct volume you need to first unmute the master
mixer by running 'alsa-mixer', selecting <Master> and pressing 'm'
(should display 'OO' below the slider).
The scaler coefficients look suboptimal (producing some horizontal line
artifacts), let's see whether that can be fixed.
For encoding I used ffmpeg2theora with the latest libtheora 1.2 alpha
("ptalarbvorm"), which raised Theora quality quite a lot. Command line:
ffmpeg2theora input.avi -o bbb.ogv --speedlevel 0 \
-x 256 -y 144 -a 0 --channels 2 -v 8
This is about 2MB/minute. Use -v6 to get down to about 1MB/minute.
GnuPG public key: http://user.cs.tu-berlin.de/~dvdkhlng/dk.gpg
Fingerprint: B17A DC95 D293 657B 4205 D016 7DEF 5323 C174 7D40
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