( ! ) Warning: session_start(): open(/var/lib/php/session/sess_r5th4qh1ujltp966575t85fc54, O_RDWR) failed: No such file or directory (2) in /var/www/bitweaver/live/users/includes/bit_setup_inc.php on line 82
Call Stack
#TimeMemoryFunctionLocation
10.0000232848{main}( ).../page_history.php:0
20.0001234904require_once( '/var/www/bitweaver/live/kernel/includes/setup_inc.php' ).../page_history.php:16
30.01871909072BitSystem->scanPackages( ).../setup_inc.php:141
40.02062177352BitSystem->loadPackage( ).../BitSystem.php:1183
50.02062180384include_once( '/var/www/bitweaver/live/users/includes/bit_setup_inc.php' ).../BitSystem.php:1109
60.02102584632session_start ( ).../bit_setup_inc.php:82

( ! ) Warning: session_write_close(): open(/var/lib/php/session/sess_r5th4qh1ujltp966575t85fc54, O_RDWR) failed: No such file or directory (2) in /var/www/bitweaver/live/kernel/includes/classes/BitSystem.php on line 580
Call Stack
#TimeMemoryFunctionLocation
10.0000232848{main}( ).../page_history.php:0
20.06225361904BitSystem->display( ).../page_history.php:57
30.06235363600BitSystem->preDisplay( ).../BitSystem.php:505
40.06365378136session_write_close ( ).../BitSystem.php:580

( ! ) Warning: session_write_close(): Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/lib/php/session) in /var/www/bitweaver/live/kernel/includes/classes/BitSystem.php on line 580
Call Stack
#TimeMemoryFunctionLocation
10.0000232848{main}( ).../page_history.php:0
20.06225361904BitSystem->display( ).../page_history.php:57
30.06235363600BitSystem->preDisplay( ).../BitSystem.php:505
40.06365378136session_write_close ( ).../BitSystem.php:580
- bitweaver
{maketoc}
The flv plugin is a video handler for treasury. it will convert videos of various formats including avi, mpg, mov and more to flashvideo and allowing you to conveniently view the converted video from within your browser. A site that uses a similar process is [http://www.youtube.com|youtube].


! Installtion
The flv plugin for treasury is quite sophisticated. You need to install software on the server (you might even have to compile some binaries yourself), optionally install some php extension and install or activate a few files in bitweaver. if you are not prepared to do this, there isn't much point in reading on.

The conversion process can be lengthy and therefore it is possible to run the conversion using a cron job. The cron php file is already present and all that needs to be done is add the appropriate cron job to your cron file, set the cron option in treasury and everything is set. This plugin also requires a recent version of [http://ffmpeg.mplayerhq.hu|ffmpeg]. In fact, you need to compile the svn version of ffmpeg as other versions don't support conversion to .flv files (luckily, gentoo users only need to emerge --sync and compile the regular version of ffmpeg...).

The plugin also supports the use of [http://ffmpeg-php.sourceforge.net/|ffmpeg-php]. This extension is __not__ required but will enable bitweaver to extract video information such as video duration and other useless but handy information to improve processing and therefor final result.

Example of [http://fca.at/wiki/Grundkurs|serverside converted videos]

{code source=PHP title="taken from treasury/cron.flv.php"}
/* ================================= FFMPEG =================================
If you want to make use of the flv plugin, you need to install the svn version
of ffmpeg. only the latest version of ffmpeg supports the flv format.


--- INSTALL [required]
You will need the svn version of ffmpeg and you will have to compile this
yourself:

svn checkout svn://svn.mplayerhq.hu/ffmpeg/trunk ffmpeg
cd ffmpeg
./configure --help | grep enable
./configure --enable-mp3lame --enable-gpl
make
make install
-- NOTE
Depending on the system, you might be able to support more formats. These are
the configure flags i used:
./configure --enable-mp3lame --enable-gpl --enable-a52 --enable-libogg \
--enable-vorbis --enable-xvid


--- CRON [optional]
Processing video files can take a while and this process is therefore designed to be
run as a cron job. Set up a cron job similar to the following. This will check for
open conversion jobs every minute:
* * * * * apache /path/to/php -q /path/to/cron.flv.php [number of videos to process] >> /path/to/log/file.log
-- NOTE
- make sure apache is your apache user - you can check the 'User' setting in
your apache.conf file (usually located at /etc/apache2/httpd.conf)
- [number of videos to process] is optional, default is 3


================================= FFMPEG-PHP =================================
--- INSTALL [optional]
ffmpeg-php is a php extension that makes it possible to easily access video
information from within php. Please view the official site on how to add
ffmpeg-php to your php setup: http://ffmpeg-php.sourceforge.net

all it allows us to do is check the aspect ratio and video length. This allows
us to extract more appropriate video images and make more accurate conversions.

If you compile it as an extension, it should be recognised by this script. If
you decide to compile it into your php, please modify the script below where it
says:
if( extension_loaded( 'ffmpeg' )) {
}
*/
{/code}


! Plugins
Once the software is in place you need to make sure the flv plugin is active in the treasury plugin admin screen. As soon as this is active some plugin specific options will appear. Please see [#PluginSettings|below] for details.
To make full use of treasury related attachments in wiki pages in general, make sure you activate the __treasury storage plugin__ and the __flashvideo data plugin__ in the liberty plugins admin page as well.


! Plugin settings
In the treasury plugin admin screen there are a few flv-specific options you can set. Please make sure that the suggested path to ffmpeg is correct. without this no videos will be converted. The video and audio settings are basically: the higher the better the quality but also the larger the download.

!! Video conversion results
Here are some basic tests i made using a 600 second high quality divx film.
||~ Video rate | Audio rate | Video size | File size | Encoding time | Recommended
11025 | 16 | 240x136 | 16862250 (17M) | 76 |
11025 | 16 | 320x180 | 16882052 (17M) | 95 |
11025 | 16 | 480x270 | 17036850 (17M) | 134 |
11025 | 16 | 640x360 | 23841898 (23M) | 189 |
11025 | 32 | 240x136 | 18067121 (18M) | 77 |
11025 | 32 | 320x180 | 18086923 (18M) | 99 |
11025 | 32 | 480x270 | 18241721 (18M) | 139 |
11025 | 32 | 640x360 | 25046769 (24M) | 195 |
11025 | 64 | 240x136 | 20476865 (20M) | 73 |
11025 | 64 | 320x180 | 20496667 (20M) | 90 |
11025 | 64 | 480x270 | 20651465 (20M) | 130 |
11025 | 64 | 640x360 | 27456513 (27M) | 191 |
22050 | 16 | 240x136 | 17046610 (17M) | 81 |
22050 | 16 | 320x180 | 17066412 (17M) | 99 |
22050 | 16 | 480x270 | 17221210 (17M) | 139 |
22050 | 16 | 640x360 | 24026258 (23M) | 214 |
22050 | 32 | 240x136 | 18251377 (18M) | 91 |
22050 | 32 | 320x180 | 18271179 (18M) | 106 | *****
22050 | 32 | 480x270 | 18425977 (18M) | 151 | ****
22050 | 32 | 640x360 | 25231025 (25M) | 202 |
22050 | 64 | 240x136 | 20660911 (20M) | 86 |
22050 | 64 | 320x180 | 20680713 (20M) | 101 |
22050 | 64 | 480x270 | 20835511 (20M) | 142 |
22050 | 64 | 640x360 | 27640559 (27M) | 200 |
44100 | 16 | 240x136 | 0 ( 0) | 0 |
44100 | 16 | 320x180 | 0 ( 0) | 0 |
44100 | 16 | 480x270 | 0 ( 0) | 0 |
44100 | 16 | 640x360 | 0 ( 0) | 0 |
44100 | 32 | 240x136 | 18251256 (18M) | 100 |
44100 | 32 | 320x180 | 18271058 (18M) | 114 |
44100 | 32 | 480x270 | 18425856 (18M) | 156 |
44100 | 32 | 640x360 | 25230904 (25M) | 213 |
44100 | 64 | 240x136 | 20660686 (20M) | 110 |
44100 | 64 | 320x180 | 20680488 (20M) | 127 | ****
44100 | 64 | 480x270 | 20835286 (20M) | 174 | ***
44100 | 64 | 640x360 | 27640334 (27M) | 234 | ||

{code title="Video conversion test script" source=Bash}
#!/bin/bash

# path to video file to convert
videofile="video.avi"

# aspect ratio of the video
aspect="16:9"

# various sizes bitweaver can create - width is set by bitweaver, calculate video hight as determined by the aspect ratio of the video
size="240x136 320x180 480x270 640x360"

# video quality settings availabe in bitweaver
video="11025 22050 44100"
audio="16 32 64"

echo "! Video conversion results" > results.wiki
echo "||~ Video rate | Audio rate | Video size | File size | Encoding time" >> results.wiki

for v in $video; do
for a in $audio; do
for z in $size; do
begin=`date +%s`
name="flv2-$v-$a-$z"
ffmpeg -i $videofile -acodec mp3 -ar $v -ab $a -f flv -s $z -aspect $aspect -y $name
now=`date +%s`
duration=$(($now - $begin))
bytes=`ls -s $name | sed 's/ .*$//'`
hbytes=`ls -sh $name | sed 's/ .*$//'`
echo "$v | $a | $z | $bytes ($hbytes) | $duration" >> results.wiki
mv $name "$name-$duration.flv"
done
done
done

echo "||" >> results.wiki
{/code}

Feel free to run your own tests and post your results here or append them as a comment
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