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Granite de l’Aber Ildut
9 septembre 2011, par
Mis à jour : Septembre 2011
Langue : français
Type : Texte
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Géodiversité
9 septembre 2011, par ,
Mis à jour : Août 2018
Langue : français
Type : Texte
Autres articles (48)
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Formulaire personnalisable
21 juin 2013, parCette page présente les champs disponibles dans le formulaire de publication d’un média et il indique les différents champs qu’on peut ajouter. Formulaire de création d’un Media
Dans le cas d’un document de type média, les champs proposés par défaut sont : Texte Activer/Désactiver le forum ( on peut désactiver l’invite au commentaire pour chaque article ) Licence Ajout/suppression d’auteurs Tags
On peut modifier ce formulaire dans la partie :
Administration > Configuration des masques de formulaire. (...) -
Amélioration de la version de base
13 septembre 2013Jolie sélection multiple
Le plugin Chosen permet d’améliorer l’ergonomie des champs de sélection multiple. Voir les deux images suivantes pour comparer.
Il suffit pour cela d’activer le plugin Chosen (Configuration générale du site > Gestion des plugins), puis de configurer le plugin (Les squelettes > Chosen) en activant l’utilisation de Chosen dans le site public et en spécifiant les éléments de formulaires à améliorer, par exemple select[multiple] pour les listes à sélection multiple (...) -
Qu’est ce qu’un masque de formulaire
13 juin 2013, parUn masque de formulaire consiste en la personnalisation du formulaire de mise en ligne des médias, rubriques, actualités, éditoriaux et liens vers des sites.
Chaque formulaire de publication d’objet peut donc être personnalisé.
Pour accéder à la personnalisation des champs de formulaires, il est nécessaire d’aller dans l’administration de votre MediaSPIP puis de sélectionner "Configuration des masques de formulaires".
Sélectionnez ensuite le formulaire à modifier en cliquant sur sont type d’objet. (...)
Sur d’autres sites (6789)
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Screeching white sound coming while playing audio as a raw stream
27 avril 2020, par Sri Nithya SharabheshwaranandaI. Background



- 

- I am trying to make an application which helps to match subtitles to the audio waveform very accurately at the waveform level, at the word level or even at the character level.
- The audio is expected to be Sanskrit chants (Yoga, rituals etc.) which are extremely long compound words [ example - aṅganyā-sokta-mātaro-bījam is traditionally one word broken only to assist reading ]
- The input transcripts / subtitles might be roughly in sync at the sentence/verse level but surely would not be in sync at the word level.
- The application should be able to figure out points of silence in the audio waveform, so that it can guess the start and end points of each word (or even letter/consonant/vowel in a word), such that the audio-chanting and visual-subtitle at the word level (or even at letter/consonant/vowel level) perfectly match, and the corresponding UI just highlights or animates the exact word (or even letter) in the subtitle line which is being chanted at that moment, and also show that word (or even the letter/consonant/vowel) in bigger font. This app's purpose is to assist learning Sanskrit chanting.
- It is not expected to be a 100% automated process, nor 100% manual but a mix where the application should assist the human as much as possible.













II. Following is the first code I wrote for this purpose, wherein



- 

- First I open a mp3 (or any audio format) file,
- Seek to some arbitrary point in the timeline of the audio file // as of now playing from zero offset
- Get the audio data in raw format for 2 purposes - (1) playing it and (2) drawing the waveform.
- Playing the raw audio data using standard java audio libraries











III. The problem I am facing is, between every cycle there is screeching sound.



- 

- Probably I need to close the line between cycles ? Sounds simple, I can try.
- But I am also wondering if this overall approach itself is correct ? Any tip, guide, suggestion, link would be really helpful.
- Also I just hard coded the sample-rate etc ( 44100Hz etc. ), are these good to set as default presets or it should depend on the input format ?









IV. Here is the code



import com.github.kokorin.jaffree.StreamType;
import com.github.kokorin.jaffree.ffmpeg.FFmpeg;
import com.github.kokorin.jaffree.ffmpeg.FFmpegProgress;
import com.github.kokorin.jaffree.ffmpeg.FFmpegResult;
import com.github.kokorin.jaffree.ffmpeg.NullOutput;
import com.github.kokorin.jaffree.ffmpeg.PipeOutput;
import com.github.kokorin.jaffree.ffmpeg.ProgressListener;
import com.github.kokorin.jaffree.ffprobe.Stream;
import com.github.kokorin.jaffree.ffmpeg.UrlInput;
import com.github.kokorin.jaffree.ffprobe.FFprobe;
import com.github.kokorin.jaffree.ffprobe.FFprobeResult;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicLong;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.SourceDataLine;


public class FFMpegToRaw {
 Path BIN = Paths.get("f:\\utilities\\ffmpeg-20190413-0ad0533-win64-static\\bin");
 String VIDEO_MP4 = "f:\\org\\TEMPLE\\DeviMahatmyamRecitationAudio\\03_01_Devi Kavacham.mp3";
 FFprobe ffprobe;
 FFmpeg ffmpeg;

 public void basicCheck() throws Exception {
 if (BIN != null) {
 ffprobe = FFprobe.atPath(BIN);
 } else {
 ffprobe = FFprobe.atPath();
 }
 FFprobeResult result = ffprobe
 .setShowStreams(true)
 .setInput(VIDEO_MP4)
 .execute();

 for (Stream stream : result.getStreams()) {
 System.out.println("Stream " + stream.getIndex()
 + " type " + stream.getCodecType()
 + " duration " + stream.getDuration(TimeUnit.SECONDS));
 } 
 if (BIN != null) {
 ffmpeg = FFmpeg.atPath(BIN);
 } else {
 ffmpeg = FFmpeg.atPath();
 }

 //Sometimes ffprobe can't show exact duration, use ffmpeg trancoding to NULL output to get it
 final AtomicLong durationMillis = new AtomicLong();
 FFmpegResult fFmpegResult = ffmpeg
 .addInput(
 UrlInput.fromUrl(VIDEO_MP4)
 )
 .addOutput(new NullOutput())
 .setProgressListener(new ProgressListener() {
 @Override
 public void onProgress(FFmpegProgress progress) {
 durationMillis.set(progress.getTimeMillis());
 }
 })
 .execute();
 System.out.println("audio size - "+fFmpegResult.getAudioSize());
 System.out.println("Exact duration: " + durationMillis.get() + " milliseconds");
 }

 public void toRawAndPlay() throws Exception {
 ProgressListener listener = new ProgressListener() {
 @Override
 public void onProgress(FFmpegProgress progress) {
 System.out.println(progress.getFrame());
 }
 };

 // code derived from : https://stackoverflow.com/questions/32873596/play-raw-pcm-audio-received-in-udp-packets

 int sampleRate = 44100;//24000;//Hz
 int sampleSize = 16;//Bits
 int channels = 1;
 boolean signed = true;
 boolean bigEnd = false;
 String format = "s16be"; //"f32le"

 //https://trac.ffmpeg.org/wiki/audio types
 final AudioFormat af = new AudioFormat(sampleRate, sampleSize, channels, signed, bigEnd);
 final DataLine.Info info = new DataLine.Info(SourceDataLine.class, af);
 final SourceDataLine line = (SourceDataLine) AudioSystem.getLine(info);

 line.open(af, 4096); // format , buffer size
 line.start();

 OutputStream destination = new OutputStream() {
 @Override public void write(int b) throws IOException {
 throw new UnsupportedOperationException("Nobody uses thi.");
 }
 @Override public void write(byte[] b, int off, int len) throws IOException {
 String o = new String(b);
 boolean showString = false;
 System.out.println("New output ("+ len
 + ", off="+off + ") -> "+(showString?o:"")); 
 // output wave form repeatedly

 if(len%2!=0) {
 len -= 1;
 System.out.println("");
 }
 line.write(b, off, len);
 System.out.println("done round");
 }
 };

 // src : http://blog.wudilabs.org/entry/c3d357ed/?lang=en-US
 FFmpegResult result = FFmpeg.atPath(BIN).
 addInput(UrlInput.fromPath(Paths.get(VIDEO_MP4))).
 addOutput(PipeOutput.pumpTo(destination).
 disableStream(StreamType.VIDEO). //.addArgument("-vn")
 setFrameRate(sampleRate). //.addArguments("-ar", sampleRate)
 addArguments("-ac", "1").
 setFormat(format) //.addArguments("-f", format)
 ).
 setProgressListener(listener).
 execute();

 // shut down audio
 line.drain();
 line.stop();
 line.close();

 System.out.println("result = "+result.toString());
 }

 public static void main(String[] args) throws Exception {
 FFMpegToRaw raw = new FFMpegToRaw();
 raw.basicCheck();
 raw.toRawAndPlay();
 }
}





Thank You


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lavfi/dnn_backend_openvino.c : Spelling Correction in OpenVino Backend
23 avril 2021, par shubhanshu02 -
Multi-Threaded Video Decoder Leaks Memory
3 janvier 2018, par CethricMy intention is to create a relatively simple video playback system to be used in a larger program that I am working on. Relevant code to the video decoder is here. The best I have been able to do so far is narrow down the memory leak to this section of code (or rather I have not noticed any memory leaks occurring when video is not used).
This is probably a very broad question how ever I am unsure of the scope of the issue I am having and as such of how to word my question.
What I want to know is what have I missed or done wrong that has lead to a noticeable memory leak (by noticeable I mean I can watch memory usage climb megabytes per minute). I have tried ensured that every allocation that I make is matched by a deallocation.
EDIT 1
This is to be built on a Windows 10 machine running MSYS2 (MinGW64)