HowTos/Video

From OpenZaurus

Here are some useful instructions about video encoding and playback avaliable from the pdaXrom site:

http://mail.pdaxrom.org/node/63

I have found the following page useful as well:

http://www.zeb.uklinux.net/encoding.html

Here is a script for playing mpegs/mp3s with mplayer (using the mad libs and the framebuffer) :

#!/bin/sh
mplayer -quiet -vo fbdev -ac mad -framedrop -fs $1

Here is the script I use for playing ogg/ogm files:

#!/bin/sh
mplayer -quiet -vo fbdev -framedrop -fs $1



[edit]

Encoding and Playing Video for C7×0 Devices

Copied from http://openzaurus.org/wordpress/howto/encoding-and-playing-video-for-c7x0-devices/

May 4th, 2005 by XorA

UPDATED 06/07/2005

The golden version of mplayer for the c7×0 devices currently is mplayer-atty_1.1.5 as found in OE. You should build a copy of this or find someone that has it built.

To play videos optimally (at 30 fps with no drops on 400Mhz clamshells) they should be resized to 320×240 using DivX and mp3 (ogg is possible but mencoder doesnt do ogg). Here is the script I use to encode my videos. 

#!/bin/sh

OUTFILE=$1
echo "Outputting to $OUTFILE"
shift

mencoder "$@" -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=300:vpass=1 \
 -lameopts cbr:br=64:mode=3 -vf scale=320:240,rotate=1 -oac mp3lame -o $OUTFILE
mencoder "$@" -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=300:vpass=2 \
 -lameopts cbr:br=64:mode=3 -vf scale=320:240,rotate=1 -oac mp3lame -o $OUTFILE

Run this as encode blah-output.avi blah-input.avi, you will get a nicely resized and rotated DivX movie. I rotate on desktop as overlay on C7×0 is always in portrait and it wastes valuable CPU to rotate on the Z itself.

Recent changes to mplayer-atty mean you no longer need to switch out of X11/Opie in order to play videos. This means the playing command has got a lot simpler. 

#! /bin/sh

# next line depends on kernel version
echo 1 >/sys/class/graphics/fb0/driver/w100fb/fastpllclk
echo 1 >/sys/class/graphics/fb0/device/fastpllclk

mplayer -vo w100 -ac mad -ao oss -framedrop -really-quiet -fs $@

I find this script will happilly play the movies I have resized at full speed on a C860 device.

There is a small bit of corruption on left hand side of my screen, Im not sure what causes this, but its hardly noticable.

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