Freevo Notes
============

$Id: NOTES 4057 2003-10-18 22:06:21Z krister $

This file contains random notes that are useful when dealing with Freevo


grep "open(" log.txt | grep -v "/proc" | grep -v ENOENT | grep -v ENOTDIR | cut -c5- | cut -f1 -d "=" | sort -u
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Python debuggers:

Wing IDE: Seems pretty good. Free trial, free smaller version, free
          for open-source developers.

HAP: http://sourceforge.net/projects/hapdebugger

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Microsoft Core Truetype Fonts

http://corefonts.sourceforge.net/
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Nice looking PVR:

http://www.metrolink.com/products/media/index.html
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libdvdread, libdvdcss from dtek

css:
./configure --disable-gtk   --disable-x11   --disable-xvideo   

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MPlayer:

cvs -d:pserver:anonymous@mplayerhq.hu:/cvsroot/mplayer login
cvs -z3 -d:pserver:anonymous@mplayerhq.hu:/cvsroot/mplayer co main

cvs -d:pserver:anonymous@cvs.ffmpeg.sourceforge.net:/cvsroot/ffmpeg login
cvs -d:pserver:anonymous@cvs.ffmpeg.sourceforge.net:/cvsroot/ffmpeg co ffmpeg

mv ffmpeg/libavcodec main
rm -rf ffmpeg

cp /usr/local/include/dvdnav/* /usr/local/include

./configure --enable-tv-v4l --enable-mga --enable-xmga --enable-largefiles --disable-lirc 

mga_vid driver:
mknod /dev/mga_vid c 178 0

To make it load/unload automatically when needed, insert the following 
line at the end of /etc/modules.conf:

    alias char-major-178 mga_vid

Then run

    depmod -a



MPlayer TV viewing
mplayer -vo xv -tv on:driver=v4l:input=0:norm=NTSC:channel=49:chanlist=us-cable:width=640:height=480:outfmt=yuy2 -nocache 

Mencoder TV recording
=====================

95% (YUY2)
mencoder -tv on:driver=v4l:input=0:norm=NTSC:channel=49:chanlist=us-cable:width=320:height=240:outfmt=yuy2:adevice=/dev/dsp2:audiorate=32000:forceaudio:forcechan=2 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=800:keyint=30 -oac mp3lame -lameopts br=80:cbr -ffourcc divx -o tst.avi


80% (YV12)
mencoder -tv on:driver=v4l:input=0:norm=NTSC:channel=49:chanlist=us-cable:width=320:height=240:outfmt=yv12:adevice=/dev/dsp2:audiorate=32000:forceaudio:forcechan=2 -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=800:keyint=30 -oac mp3lame -lameopts br=80:cbr -ffourcc divx -o tst.avi



The btaudio module must be loaded, use modprobe "*btaudio*"


Options for bmovl:
-vop bmovl=1:0:/tmp/bmovl-freevo.fifo
1 = Hidden at startup (send SHOW/HIDE to change)
0 = Opaque at startup = don't use alpha = copy whole buffer overwriting
    background. Use OPAQUE/ALPHA to change.

N.B.: You must use YV12 output (outfmt=yv12) from the TV with bmovl, 
      otherwise it will have to use a slow SW conversion!

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NVREC:

Requires very recent versions of autoconf and automake:

ftp://ftp.gnu.org/gnu/autoconf/autoconf-2.53.tar.gz
ftp://ftp.gnu.org/gnu/automake/automake-1.6.2.tar.gz

Compile autoconf before automake.

Build only nuvrec:

cd ..
./bootstrap
./configure --without-avifile --without-rte --without-divx4linux \
   --without-quicktime --without-sdl --without-mad --without--ffmpeg
make

Record sound using the btaudio device
./nuvrec -F 300000 -norm NTSC -input Television -w 320 -h 240 -vq 100 \
    -d /dev/dsp2 -mixsrc /dev/mixer2:line1 -o tst2.avi

Speed on a Celeron 500 MHz:
(32000 Hz, 16 bit mono PCM)
640x480 framedrops heavily.
nuvrec 640x240  -vq 100         75%               6.34 Mbit/s
nuvrec 320x240  -vq 100         35%               4.35 Mbit/s  =  1.8 GB/h
nuvrec 320x240  -vq  90         35%               3.95 Mbit/s  =  1.6 GB/h


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Video4Linux1 API docs:

http://www.linuxhq.com/kernel/v2.4/doc/video4linux/API.html

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Aspect ratio resolutions:
1.33  576x432
1.78  688x384

FFMPEG encoder for DVDs
MP3 constant bitrate, 112 kbps

1) Check aspect ratio:
/usr/local/bin/mplayer -dvd 1 -frames 0
( mplayer -dvd 1 -vo null -ao null -frames 0 >& /dev/stdout ) | grep Movie-Aspect

You should see something like:
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.

2) Scaling values
1.33    576:432
1.78    688:384


2) Crop detect:
/usr/local/bin/mencoder -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=900:vratetol=100000:keyint=100:vhq -oac mp3lame -lameopts br=112:cbr -sws 2 -vop cropdetect -o tst.avi -dvd 1 -ffourcc divx -alang en -ss 0:14:00 -frames 100

Example crop detect output value:
-vop crop=716:364:2:56

Start with the number of lines, and make it divisible by 16 for better encoding.
Y: (364/16) * 16 = 352. 12 pixels less, add 6 to the y offset which was 56 = 62.

X: (716 / 16) * 16 = 704. 12 pixels less, add 6 to the x offset which was 2 = 8

Check new aspect ratio: 704/352=
New values: -vop crop=704:352:8:62



Add "-ofps 23.976" if there are a lot of "skip frame!!!" messages (inverse telecine).

Record with NVrec:
DIVX4rec -F 300000 -norm NTSC -input Composite1 -m -r 22050 -w 320 -h 240 \
-ab 80 -vg 100 -vb 700 -mixsrc /dev/dsp:line -mixvol /dev/dsp:line:80 -o 

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btaudio notes:
use the analog channel, /dev/dsp2,mixer1 for a system with 1 soundcard and 1 bttv card
input levels seem high, set a low recgain
the samplerate cannot be set to exactly 44100, it becomes 44800 instead. 32000 works
NUVrec cannot do samplerates other than 44100, stereo, 16 bits.

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ISOLINUX:
Use rootcd=1 to use the CD for root.
rootfstype=iso9660

Linux root:

As root:

cp -dpR /dev/fd[01]* dev
cp -dpR /dev/tty[0-6] dev
cp -dpR /dev/console dev
cp -dpR /dev/kmem dev
cp -dpR /dev/mem dev
cp -dpR /dev/null dev
cp -dpR /dev/ram0 dev
cp -dpR /dev/hd* dev
cp -dpR /dev/fd* dev


test
