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Carte de Schillerkiez
13 mai 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
Autres articles (74)
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Multilang : améliorer l’interface pour les blocs multilingues
18 février 2011, parMultilang est un plugin supplémentaire qui n’est pas activé par défaut lors de l’initialisation de MediaSPIP.
Après son activation, une préconfiguration est mise en place automatiquement par MediaSPIP init permettant à la nouvelle fonctionnalité d’être automatiquement opérationnelle. Il n’est donc pas obligatoire de passer par une étape de configuration pour cela. -
Des sites réalisés avec MediaSPIP
2 mai 2011, parCette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page. -
Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs
Sur d’autres sites (11495)
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How to extract audio from video with ffmpegKit in flutter
8 juillet 2024, par Carlos PeñarandaI want to extract audio from video with this method :


Future<audio> extractAudio(Video video, String formatAudioByUser) async {
 
 final pathAudio = video.pathIn;

 FFmpegKit.execute(
 '-i ${video.pathIn} -q:a 0 -map a audio_${video.title}.mp3')
 .then((session) async {
 final returnCode = await session.getReturnCode();

 if (ReturnCode.isSuccess(returnCode)) {
 Fluttertoast.showToast(msg: 'Extraccion exitosa');
 } else if (ReturnCode.isCancel(returnCode)) {
 Fluttertoast.showToast(msg: 'Extraccion cancelada');
 } else {
 final error = await session.getFailStackTrace();
 Fluttertoast.showToast(msg: 'Fallo al extraer audio: $error');
 }
 });

//creates object
 final audio = Audio(
 id: 'audio_${video.id}',
 title: 'audio_${video.title}',
 duration: video.duration,
 pathIn: video.pathIn, 
 pathOut:pathAudio,
 format: formatAudioByUser,
 );
 
 return audio;
 }
</audio>

which i use in my datasource_impl.


But when choosing the media (video) and running the method, it doesn't work from the ffmpegkit script, and it shows this error :
"Fallo al extraer audio: null"

I've reviewed the debugging mode, and created brakpoints, but all the video data looks good.


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How to add a subtitle to a video using ffmpeg in Flutter ?
3 juillet 2024, par Mohammed BekeleI'm using flutter_ffmpeg_kit_full package to add subtitles to my video. First I loop through all words and create an srt file and stored it in temp folder :


Future<string> _createSrtFile() async {
 String filePath = await getSrtOutputFilePath();

 final file = File(filePath);
 final buffer = StringBuffer();

 for (int i = 0; i < widget.words.length; i++) {
 final word = widget.words[i];
 final startTime = _formatSrtTime(word['startTime'].toDouble());
 final endTime = _formatSrtTime(word['endTime'].toDouble());
 final text = word['word'];

 buffer.writeln('${i + 1}');
 buffer.writeln('$startTime --> $endTime');
 buffer.writeln('$text');
 buffer.writeln('');
 }

 await file.writeAsString(buffer.toString());
 return filePath;
 }

 String _formatSrtTime(double seconds) {
 final int hours = seconds ~/ 3600;
 final int minutes = ((seconds % 3600) ~/ 60);
 final int secs = (seconds % 60).toInt();
 final int millis = ((seconds - secs) * 1000).toInt() % 1000;

 return '${hours.toString().padLeft(2, '0')}:${minutes.toString().padLeft(2, '0')}:${secs.toString().padLeft(2, '0')},${millis.toString().padLeft(3, '0')}';
 }
</string>

Then I create a future function to handle the export by using ffmpeg command :


Future<void> _exportVideo() async {
 final hasPermission = await _requestStoragePermission();
 if (!hasPermission) {
 ScaffoldMessenger.of(context).showSnackBar(
 const SnackBar(content: Text('Storage permission denied')));
 return;
 }

 setState(() {
 _isProcessing = true;
 _outputFilePath = "";
 });

 try {
 final srtFilePath = await _createSrtFile();

 String videoPath = widget.videoFile!.path;

 String _outputPath = await getOutputFilePath();

 final command =
 '-i $videoPath -vf "drawtext="text=\'Stack Overflow\':fontcolor=white:fontsize=24:box=1:boxcolor=black@0.5:boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2"" -codec:a copy $_outputPath';

 // final cmd = [
 // '-i',
 // videoPath,
 // '-preset',
 // 'ultrafast',
 // '-vf',
 // 'subtitles=$srtFilePath:force_style=\'Fontname=Roboto Bold,FontSize=30,MarginV=70,PrimaryColour=ffffff,OutlineColour=000000\'',
 // _outputPath
 // ];
 // FFmpegKit.executeWithArguments(cmd)

 print('Executing FFmpeg command: $command');

 await FFmpegKit.execute(command).then((session) async {
 final returnCode = await session.getReturnCode();
 final output = await session.getOutput();
 final failStackTrace = await session.getFailStackTrace();

 print('FFmpeg Output: $output');
 if (failStackTrace != null) {
 print('FFmpeg Fail StackTrace: $failStackTrace');
 }

 if (ReturnCode.isSuccess(returnCode)) {
 setState(() {
 _outputFilePath = _outputPath;
 });
 ScaffoldMessenger.of(context).showSnackBar(
 const SnackBar(content: Text('Export successful!')));
 } else {
 final logs = await session.getLogsAsString();
 print('FFmpeg Logs: $logs');
 ScaffoldMessenger.of(context)
 .showSnackBar(const SnackBar(content: Text('Export failed!')));
 }
 });
 } catch (e) {
 print('Error: $e');
 ScaffoldMessenger.of(context).showSnackBar(
 SnackBar(content: Text('Export failed with error: $e')));
 } finally {
 setState(() {
 _isProcessing = false;
 });
 }
 }
</void>

I did the export without the subtitles and it works. but the issue is when I try to do it with subtitles. I don't know what fault I'm making but this code is failing to export. Here is the path for the srt and video itself :


Future<string> getOutputFilePath() async {
 final Directory? downloadsDir = await getDownloadsDirectory();
 final timestamp = DateTime.now().millisecondsSinceEpoch;
 final name = "output-$timestamp.avi";
 return '${downloadsDir!.path}/$name'; // Save in downloads folder
 }

 Future<string> getSrtOutputFilePath() async {
 final Directory? downloadsDir = await getDownloadsDirectory();
 final timestamp = DateTime.now().millisecondsSinceEpoch;
 final name = "caption-$timestamp.srt";
 return '${downloadsDir!.path}/$name'; // Save in downloads folder
 }
</string></string>

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How to cut and merge avi videos with java
17 août 2017, par MonticleI want to cut and merge some avi videos(same codec, same resolution, same fps) using java library.
Now I am trying this using Humble video(https://github.com/artclarke/humble-video), which is based on ffmpeg.
I want to use the seek function to cut the input video first, but the result is not correct.
this is my code.
public void cutjob(String input, String output, int starttime) {
final Demuxer demuxer = Demuxer.make();
final Muxer muxer = Muxer.make(output, null, "avi");
try {
demuxer.open(input, null, false, true, null, null);
final MuxerFormat format = MuxerFormat.guessFormat("avi", null, null);
int n = demuxer.getNumStreams();
final Decoder[] decoders = new Decoder[n];
for (int i = 0; i < n; i++) {
final DemuxerStream ds = demuxer.getStream(i);
decoders[i] = ds.getDecoder();
final Decoder d = decoders[i];
if (d != null) {
if (format.getFlag(MuxerFormat.Flag.GLOBAL_HEADER))
d.setFlag(Coder.Flag.FLAG_GLOBAL_HEADER, true);
d.open(null, null);
muxer.addNewStream(d);
}
}
muxer.open(null, null);
demuxer.seek(-1, Long.MIN_VALUE, (long)starttime* Global.getDefaultTimeBase().getDenominator(), Long.MAX_VALUE, Demuxer.SeekFlag.SEEK_ANY.swigValue());
final MediaPacket packet = MediaPacket.make();
long dts = -1;
while (demuxer.read(packet) >= 0) {
System.out.println("dts:"+packet.getDts() + ",pts:"+packet.getPts());
final Decoder d = decoders[packet.getStreamIndex()];
if (packet.isComplete() && d != null) {
dts = dts == -1 ? packet.getDts() : dts;
packet.setDts(packet.getDts() - dts);
packet.setPosition(-1);
muxer.write(packet, false);
}
}
muxer.close();
demuxer.close();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}The video source is about 190 seconds long, and I set the "starttime" as 180,
want to cut the last 10 seconds and write to a new avi file.The output avi file is 10 seconds long, but only the last 5s of the video is correct, the first 5s seems no data.
Is there any wrong in my code.
Thanks.
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