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The Slip - Artworks
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
Autres articles (63)
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MediaSPIP 0.1 Beta version
25 avril 2011, parMediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
The zip file provided here only contains the sources of MediaSPIP in its standalone version.
To get a working installation, you must manually install all-software dependencies on the server.
If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...) -
MediaSPIP version 0.1 Beta
16 avril 2011, parMediaSPIP 0.1 beta est la première version de MediaSPIP décrétée comme "utilisable".
Le fichier zip ici présent contient uniquement les sources de MediaSPIP en version standalone.
Pour avoir une installation fonctionnelle, il est nécessaire d’installer manuellement l’ensemble des dépendances logicielles sur le serveur.
Si vous souhaitez utiliser cette archive pour une installation en mode ferme, il vous faudra également procéder à d’autres modifications (...) -
Personnaliser en ajoutant son logo, sa bannière ou son image de fond
5 septembre 2013, parCertains thèmes prennent en compte trois éléments de personnalisation : l’ajout d’un logo ; l’ajout d’une bannière l’ajout d’une image de fond ;
Sur d’autres sites (7527)
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ffmpeg - how can I get a specific channel using channel masks (e.g. : get only surround left channel)
26 novembre 2013, par awfulcodeI'm trying to build a mixer that allows users to toggle specific channels on and off. I know that different codecs encode those channels in different orders (it's not as simple as getting channel #3 as the center channel every time), so the challenge is to properly identify the channel position in surround audio tracks.
ffmpeg does list the in the beginning of libavutil/channel_layout.h :
#define AV_CH_FRONT_LEFT 0x00000001
#define AV_CH_FRONT_RIGHT 0x00000002
#define AV_CH_FRONT_CENTER 0x00000004
#define AV_CH_LOW_FREQUENCY 0x00000008
#define AV_CH_BACK_LEFT 0x00000010
#define AV_CH_BACK_RIGHT 0x00000020
#define AV_CH_FRONT_LEFT_OF_CENTER 0x00000040
#define AV_CH_FRONT_RIGHT_OF_CENTER 0x00000080
#define AV_CH_BACK_CENTER 0x00000100
#define AV_CH_SIDE_LEFT 0x00000200
#define AV_CH_SIDE_RIGHT 0x00000400
#define AV_CH_TOP_CENTER 0x00000800
#define AV_CH_TOP_FRONT_LEFT 0x00001000
#define AV_CH_TOP_FRONT_CENTER 0x00002000
#define AV_CH_TOP_FRONT_RIGHT 0x00004000
#define AV_CH_TOP_BACK_LEFT 0x00008000
#define AV_CH_TOP_BACK_CENTER 0x00010000
#define AV_CH_TOP_BACK_RIGHT 0x00020000
#define AV_CH_STEREO_LEFT 0x20000000 ///< Stereo downmix.
#define AV_CH_STEREO_RIGHT 0x40000000 ///< See AV_CH_STEREO_LEFT.
#define AV_CH_WIDE_LEFT 0x0000000080000000ULL
#define AV_CH_WIDE_RIGHT 0x0000000100000000ULL
#define AV_CH_SURROUND_DIRECT_LEFT 0x0000000200000000ULL
#define AV_CH_SURROUND_DIRECT_RIGHT 0x0000000400000000ULL
#define AV_CH_LOW_FREQUENCY_2 0x0000000800000000ULLBut looking over the header files and whatever little documentation about ffmpeg I couldn't find anything that tells me how to assign a specific channel position (or mask, as it's described in the header file) to a specific bus in a mixer audio unit.
Do you know how to do that ? Please let me know if you want to look at the code I'm using right now.
And as always, thank you so much.
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How to export a video with a widget overlay in a Flutter app ?
30 juin 2024, par Mohammed BekeleI'm developing a Flutter app for a caption embeding on a video that needs to export a video file after processing it. I'm using the flutter_ffmpeg_kit package. However, I'm having trouble getting the export to work correctly.


Here's the code I'm using :


initially this is my stack


Expanded(
 child: Stack(
 children: [
 Center(
 child: _videoPlayerController.value.isInitialized
 ? AspectRatio(
 aspectRatio:
 _videoPlayerController.value.aspectRatio,
 child: VideoPlayer(_videoPlayerController),
 )
 : CircularProgressIndicator(),
 ),
 if (_currentCaption.isNotEmpty)
 Positioned.fill(
 child: Center(child: _buildCaptionText()),
 ),
 ],
 ),
 ),


and in export button i executed this function


Future<void> _exportVideo() async {
 setState(() {
 _isProcessing = true;
 });

 try {
 final directory = await getExternalStorageDirectory();
 final rootPath = directory?.parent.parent.parent.parent.path;
 final mobixPath = path.join(rootPath!, 'Mobix App');
 final appPath = path.join(mobixPath, 'Caption');
 final outputPath = path.join(appPath, 'Output');

 // Create the directories if they don't exist
 await Directory(outputPath).create(recursive: true);

 final timestamp = DateTime.now().millisecondsSinceEpoch;
 final outputFilePath = path.join(outputPath, 'output-$timestamp.mp4');


 // Generate the FFmpeg command
 final ffmpegCommand = _generateFFmpegCommand(
 widget.videoPath,
 outputFilePath,
 widget.words,
 _fontSize,
 _isBold,
 _isItalic,
 _fontColor,
 _backgroundColor,
 );

 // Execute the FFmpeg command
 await FFmpegKit.execute(
 ffmpegCommand,
 ).then(
 (session) async {
 // Update progress if needed
 final returnCode = await session.getReturnCode();
 if (ReturnCode.isSuccess(returnCode)) {
 setState(() {
 _outputFilePath = outputFilePath;
 });
 ScaffoldMessenger.of(context).showSnackBar(
 SnackBar(content: Text('Export successful: $_outputFilePath')),
 );
 } else {
 print('Export failed with rc: $returnCode');

 ScaffoldMessenger.of(context).showSnackBar(
 SnackBar(content: Text('Export failed with rc: $returnCode')),
 );
 }
 setState(() {
 _isProcessing = false;
 });
 },
 );
 } catch (e) {
 print('Export failed: $e');
 ScaffoldMessenger.of(context).showSnackBar(
 SnackBar(content: Text('Export failed: $e')),
 );
 setState(() {
 _isProcessing = false;
 });
 }
 }

 String _generateFFmpegCommand(
 String inputPath,
 String outputPath,
 List<dynamic> words,
 double fontSize,
 bool isBold,
 bool isItalic,
 Color fontColor,
 Color backgroundColor,
 ) {
 final ffmpegCommand = StringBuffer();

 // Add input file
 ffmpegCommand.write('-i $inputPath ');

 // Add subtitles filter
 final subtitleFilter = StringBuffer();
 for (var word in words) {
 final startTime = word['startTime'].toDouble();
 final endTime = word['endTime'].toDouble();
 final caption = word['word'];

 final fontStyle = isBold && isItalic
 ? 'bold italic'
 : isBold
 ? 'bold'
 : isItalic
 ? 'italic'
 : 'normal';
 final fontColorHex = fontColor.value.toRadixString(16).substring(2);
 final backgroundColorHex =
 backgroundColor.value.toRadixString(16).substring(2);

 subtitleFilter.write(
 "drawtext=text='$caption':x=(w-tw)/2:y=h-(2*lh):fontcolor=$fontColorHex:fontsize=$fontSize:fontStyle=$fontStyle:box=1:boxcolor=$backgroundColorHex@0.5:boxborderw=5:enable='between(t,$startTime,$endTime)',");
 }
 ffmpegCommand.write('-vf "${subtitleFilter.toString()}" ');

 // Add output file
 ffmpegCommand.write('$outputPath');

 return ffmpegCommand.toString();
 }
</dynamic></void>

when i run this it returns ReturnCode 1. what am i doing wrong ?


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How to combine 2 images with ffmpeg ?
7 octobre 2018, par senopsI have 2 images which I’d like to place one on top of the other. I made this line :
ffmpeg -i "C:\image_1.jpg" -i "C:\image_2.jpg" -q:v 1 -filter_complex "[0:v]scale=800:-1[v0];[v0][1:v]vstack" C:\combined.jpgand it works when they have the same resolution 800x800 and when the resolution of the first one is smaller than
image_2.Is it possible to add some mathematics instead of 800 to make this line suitable for any type of resolutions when the first one is bigger or the second is bigger (width and height separately) ?
I want to find a maximal dimension and scale another image to it preserving aspect ratio. If the aspect ratio of 2 images is not the same fill the holes with plain white (255,255,255).
I suppose the mathematics should be like this :
w1, h1 - width and height of the 1st img
w2, h2 - width and height of the 2st img
w1', h1', w2', h2' - width and height of resulted images
if w1 max{w1, h1, w2, h2} -> if w2/h2>=1 -> w2'=w1; h2'=h2*w2'/w2
if w1 max{w1, h1, w2, h2} -> if w2/h2<1 -> h2'=w1; w2'=w2*h2'/h2
if h1 max{w1, h1, w2, h2} -> if w2/h2>=1 -> w2'=h1; h2'=h2*w2'/w2
if h1 max{w1, h1, w2, h2} -> if w2/h2<1 -> h2'=h1; w2'=w2*h2'/h2
if w2 max{w1, h1, w2, h2} -> if w1/h1>=1 -> w1'=w2; h1'=h1*w1'/w1
if w2 max{w1, h1, w2, h2} -> if w1/h1<1 -> h1'=w2; w1'=w1*h1'/h1
if h2 max{w1, h1, w2, h2} -> if w1/h1>=1 -> w1'=h2; h1'=h1*w1'/w1
if h2 max{w1, h1, w2, h2} -> if w1/h1<1 -> h1'=h2; w1'=w1*h1'/h1If the two images i1 and i2 are 800x800 and - 436x800 resp :
the combined image will be 800x1600.If the two images i1 and i2 are 300x400 and 200x500 resp :
max(300,400,200,500)=500 ; 300x400 -> (300*500/400=375)x500 ; 200x500 -> 200x500. Align the smallest one (200x500) to center, fill the gaps (2 gaps : (375-200)/2=88) with white (255,255,255).
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