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Autres articles (112)
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Script d’installation automatique de MediaSPIP
25 avril 2011, parAfin de palier aux difficultés d’installation dues principalement aux dépendances logicielles coté serveur, un script d’installation "tout en un" en bash a été créé afin de faciliter cette étape sur un serveur doté d’une distribution Linux compatible.
Vous devez bénéficier d’un accès SSH à votre serveur et d’un compte "root" afin de l’utiliser, ce qui permettra d’installer les dépendances. Contactez votre hébergeur si vous ne disposez pas de cela.
La documentation de l’utilisation du script d’installation (...) -
Ajouter des informations spécifiques aux utilisateurs et autres modifications de comportement liées aux auteurs
12 avril 2011, parLa manière la plus simple d’ajouter des informations aux auteurs est d’installer le plugin Inscription3. Il permet également de modifier certains comportements liés aux utilisateurs (référez-vous à sa documentation pour plus d’informations).
Il est également possible d’ajouter des champs aux auteurs en installant les plugins champs extras 2 et Interface pour champs extras. -
Que fait exactement ce script ?
18 janvier 2011, parCe script est écrit en bash. Il est donc facilement utilisable sur n’importe quel serveur.
Il n’est compatible qu’avec une liste de distributions précises (voir Liste des distributions compatibles).
Installation de dépendances de MediaSPIP
Son rôle principal est d’installer l’ensemble des dépendances logicielles nécessaires coté serveur à savoir :
Les outils de base pour pouvoir installer le reste des dépendances Les outils de développements : build-essential (via APT depuis les dépôts officiels) ; (...)
Sur d’autres sites (10598)
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Parsing xml with perl and libXML
2 mai 2014, par user3589690I have an XML file which I would like to parse and use to create an arguments set for ffmpeg encoding.
This is what a dump of the xml looks like :
$VAR1 = {
'profile' => [
{
'enodingParam' => {
'videoFrameRate' => {
'arg' => '-r',
'content' => '25'
},
'audioCodec' => {
'arg' => '-acodec',
'content' => 'libfaac'
},
'videoCodec' => {
'arg' => '-vcodec',
'content' => 'libx264'
},
'videoSize' => {
'arg' => '-s',
'content' => '640x360'
},
'audioBitrate' => {
'arg' => '-ab',
'content' => '96k'
},
'videoGOP' => {
'arg' => '-g',
'content' => '90'
},
'audioRate' => {
'arg' => '-ar',
'content' => '22050'
},
'audioChannels' => {
'arg' => '-ac',
'content' => '2'
},
'videoPreset' => {
'arg' => '-vpre',
'content' => 'slow'
},
'videoBitrate' => {
'arg' => '-b',
'content' => '1200k'
}
},
'metadat' => {
'fileContainer' => '.mp4',
'profileName' => 'testpfrof1'
}
},
{
'enodingParam' => {
'videoFrameRate' => {
'arg' => '-r',
'content' => '25'
},
'audioCodec' => {
'arg' => '-acodec',
'content' => 'libfaac'
},
'videoCodec' => {
'arg' => '-vcodec',
'content' => 'libx264'
},
'videoSize' => {
'arg' => '-s',
'content' => '320x180'
},
'audioBitrate' => {
'arg' => '-ab',
'content' => '96k'
},
},
'videoGOP' => {
'arg' => '-g',
'content' => '90'
},
'audioRate' => {
'arg' => '-ar',
'content' => '22050'
},
'audioChannels' => {
'arg' => '-ac',
'content' => '2'
},
'videoPreset' => {
'arg' => '-vpre',
'content' => 'slow'
},
'videoBitrate' => {
'arg' => '-b',
'content' => '400k'
}
},
'metadat' => {
'fileContainer' => '.mp4',
'profileName' => 'testProfile2'
}
}
]
};I would like to use a foreach loop for the encodingparam node/tagname and end up with a string which looks something like this :
-acodec libfaac -vcodec libx264 -s 640x360 -ab 96kI am kind of stuck . This is what I have put together so far :
#!/usr/bin/perl
use warnings;
use strict;
use Data::Dumper;
use XML::LibXML;
my $filename = "xml/profile.xml";
my $parser = XML::LibXML->new;
my $doc = $parser->parse_file($filename)
or die "can't parse profile file: $@";
my $root = $doc->documentElement();
my @nodeList = $doc->getElementsByTagName('enodingParam');here is the xml file
<?xml version="1.0"?>
<profiles>
<profile>
<metadt>
<profilename>testp1</profilename>
<filecontainer>.mp4</filecontainer>
</metadt>
<enodingparam>
<videocodec arg="-vcodec">libx264</videocodec>
<videopreset arg="-vpre">slow</videopreset>
<videobitrate arg="-b">1200k</videobitrate>
<videowidth arg="-w">640</videowidth>
<videoheight arg="-h">360</videoheight>
<videosize arg="-s">640x360</videosize>
<videoframerate arg="-r">25</videoframerate>
<videogop arg="-g">90</videogop>
<audiobitrate arg="-ab">ab 96k</audiobitrate>
<audiocodec arg="-acodec">-acodec libfaac</audiocodec>
<audiochannels arg="-ac">2</audiochannels>
<audiorate arg="-ar">"22050"</audiorate>
</enodingparam>
</profile>
<profile>
<metadt>
<profilename>testProfile22</profilename>
<filecontainer>.mp4</filecontainer>
</metadt>
<enodingparam>
<videocodec arg="-vcodec">libx264</videocodec>
<videopreset arg="-vpre">slow</videopreset>
<videobitrate arg="-b">1200k</videobitrate>
<videowidth arg="-w">640</videowidth>
<videoheight arg="-h">360</videoheight>
<videosize arg="-s">640x360</videosize>
<videoframerate arg="-r">25</videoframerate>
<videogop arg="-g">90</videogop>
<audiobitrate arg="-ab">96k</audiobitrate>
<audiocodec arg="-acodec">libfaac</audiocodec>
<audiochannels arg="-ac">2</audiochannels>
<audiorate arg="-ar">22050</audiorate>
</enodingparam>
</profile>
</profiles>Modified the pl script to
use warnings;
use strict;
use Data::Dumper;
use XML::LibXML;
my $filename = "xml/book.xml";
my $parser = XML::LibXML->new;
my @ffmpegargs;
my $fileName="filename";
my $doc = $parser->parse_file($filename)
or die "can't parse profile file: $@";
my $root = $doc->documentElement();
my @paramList = $doc->getElementsByTagName('enodingParam');
for my $ele (@paramList)
{
# You then need to iterate over all the children of that node...
for my $param ($ele->nonBlankChildNodes())
{
my $inparams = " " . $param->getAttribute('arg') . " " . $param->textContent ;
push ( @ffmpegargs, $inparams);
}
my $ffmpeg = join(" ", @ffmpegargs);
print "ffmpeg" . $ffmpeg, "\n";
}It is printing out correctly. Now how do i add the following to the string
$filename , profileName, containerName (from the metadat node) to the same string so that my final output looks like :ffmpeg -vcodec libx264 -vpre slow -b 1200k -w 640 -h 360 -s 640x360 filename_profileName_containerNameok tried zooming ue to profile. Not sure how to traverse the child nodes. Tried this. But its nor printing the right values
use warnings;
use strict;
use Data::Dumper;
use XML::LibXML;
my $filename = "xml/book.xml";
my $parser = XML::LibXML->new;
my @ffmpegargs;
my $fileName="filename";
my $doc = $parser->parse_file($filename)
or die "can't parse profile file: $@";
my $root = $doc->documentElement();
my @paramList = $doc->getElementsByTagName('profile');
for my $ele (@paramList)
{
# You then need to iterate over all the children of that node...
for my $param ($ele->findnodes('/encodingParam/*'))
{
my $inparams = " " . $param->getAttribute('arg') . " " . $param->textContent ;
push ( @ffmpegargs, $inparams);
}
my $ffmpeg = join(" ", @ffmpegargs);
print "ffmpeg" . $ffmpeg, "\n";
} -
Saving Standard Output in memory instead of a file in C#
19 décembre 2016, par Shawn WThere is no online tutorial or even a book, for handling Standard Output with C#.
I want to save standard output in a variable (memory) instead of a file in Shell Execution.
This for storing thumbnail image from a video file with ffmpeg.
The below is my code.
public static void GetThumbnail(string video, string thumbnail, string ffdir)
{
var cmd = " -ss 00:01:00.000 -i " + '"' + video + '"' + " -vcodec rawvideo -vframes 1 -an -f rawvideo -s 320x240 pipe:1 ";
var startInfo = new ProcessStartInfo
{
WindowStyle = ProcessWindowStyle.Normal,
FileName = ffdir + "\\ffmpeg.exe ",
Arguments = cmd,
RedirectStandardOutput = true,
UseShellExecute = false
};
var process = new Process
{
StartInfo = startInfo
};
process.OutputDataReceived += ProcessOnOutputDataReceived;
process.ErrorDataReceived += ProcessOnOutputDataReceived;
process.Start();
process.WaitForExit(1000);
}
private static void ProcessOnOutputDataReceived(object sender, DataReceivedEventArgs dataReceivedEventArgs)
{
....
}But it does not enter to the event handler function (ProcessOnOutputDataReceived) when GetThumbnail function launched.
Is there any clue to solve this problem ?
I referred the question and answer here :
getting mulitple images from a single stream piped from ffmpeg stdoutBut it does not help. It seems that the code for previous .NET versions.
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lavf : deprecate compute_pkt_fields2
7 octobre 2015, par Anton Khirnovlavf : deprecate compute_pkt_fields2
All encoders set pts and dts properly now (and have been doing that for
a while), so there is no good reason to do any timestamp guessing in the
muxer.The newly added AVStreamInternal will be later used for storing all the
private fields currently living in AVStream.
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