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Exemple de boutons d’action pour une collection collaborative
27 février 2013, par
Mis à jour : Mars 2013
Langue : français
Type : Image
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Exemple de boutons d’action pour une collection personnelle
27 février 2013, par
Mis à jour : Février 2013
Langue : English
Type : Image
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Collections - Formulaire de création rapide
19 février 2013, par
Mis à jour : Février 2013
Langue : français
Type : Image
Autres articles (26)
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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. -
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 ;
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Ecrire une actualité
21 juin 2013, parPrésentez les changements dans votre MédiaSPIP ou les actualités de vos projets sur votre MédiaSPIP grâce à la rubrique actualités.
Dans le thème par défaut spipeo de MédiaSPIP, les actualités sont affichées en bas de la page principale sous les éditoriaux.
Vous pouvez personnaliser le formulaire de création d’une actualité.
Formulaire de création d’une actualité Dans le cas d’un document de type actualité, les champs proposés par défaut sont : Date de publication ( personnaliser la date de publication ) (...)
Sur d’autres sites (4899)
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Creating a continuous stream for RTMP in Node.js
9 mars 2023, par hankthetank27I'm working on an app that downloads audio from youtube that will be streamed sequentially, similar to radio broadcast. I'm having trouble getting the individual tracks to stream continuously. My idea was to write the tracks sequentially into a readable stream that then is read by FFMPEG. Here is the code I'm having trouble with...


import ytdl from "ytdl-core";
import ffmpeg from 'fluent-ffmpeg';
import { Readable } from "node:stream"

export async function startAudioStream(): Promise<void>{

 const mainStream = await createStreamedQueue()

 ffmpeg(mainStream)
 .inputOptions([
 '-re'
 ])
 .outputOption([
 // '-c:v libx264',
 // '-preset veryfast',
 // '-tune zerolatency',
 '-c:a aac',
 '-ar 44100',
 ])
 .save('rtmp://localhost/live/main.flv');
};

async function createStreamedQueue(): Promise<readable>{

 function createStream(): Readable{
 const stream = new Readable({
 read(){},
 highWaterMark: 1024 * 512,
 });
 stream._destroy = () => { stream.destroyed = true };
 return stream;
 }

 const mainStream = createStream();

 const ref1 = 'https://youtu.be/lLCEUpIg8rE'
 const ref2 = 'https://youtu.be/bRdyzdXJ0KA';

 function queueSong(src: string, stream: Readable): Promise<void>{
 return new Promise<void>((resolve, reject) => {
 ytdl(src, {
 filter: 'audioonly',
 quality: 'highestaudio'
 })
 .on('data', (data) => {
 stream.push(data);
 })
 .on('end', () => {
 resolve();
 })
 .on('error', (err) => {
 console.error('Error downloading file from YouTube.', err);
 reject(err);
 })
 })
 }
 
 await queueSong(ref1, mainStream);
 // console.log('after firsrt: ', mainStream)
 await queueSong(ref2, mainStream);
 // console.log('after second: ', mainStream)
 return mainStream;
};
</void></void></readable></void>

To start,
startAudioStreamis called to initiate a readable stream of audio to an RTMP server via FFMPEG. That is working fine. The part I'm having trouble with is "queuing" the tracks into the stream that's being fed into FFMPEG. Right now, I have a "main" stream that each songs data is being pushed into, as you can see inqueueSong. At the end of ytdl stream, the promise is resolved, allowing for the next song to be queued and its data to be pushed intomainStream. The issue that I'm experiencing is that the audio fromref1is only every played.

I can see in the logs that
mainStreamdoes grow in length after each call toqueueSong, but still will only stream the audio from the first track. My initial thought was that there is a terminating character at the of the last data chunk thats being written to the steam for each song ? But maybe im getting screwed up on how streams work...

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How do I independently fade in/out multiple (3+) overlay images over video using FFMPEG ?
9 janvier 2019, par blahblahberUsing an arbitrary source video, I would like to INDEPENDENTLY fade in/fade out a minimum of three .png overlays/watermarks at various times throughout the video. I’m having trouble getting the syntax right for the filter chain.
In these failed attempts below, I’m using four transparent .png images all at 1920x1080 using the same sized source input video. No scaling/positioning needed, just the overlays fading in and out at the defined times.
I have the functionality working without fade, unsing ’enable’, like so :
ffmpeg -i vid1.mp4 -loop 1 -i img1.png -i img2.png -i img3.png -i img4.png -filter_complex
"overlay=0:0:enable='between(t,8,11)' [tmp];
[tmp]overlay=0:0:enable='between(t,10,15)'[tmp1];
[tmp1]overlay=0:0:enable='between(t,15,138)'[tmp2];
[tmp2]overlay=0:0:enable='between(t,140,150)"
-c:v libx264 -c:a copy
-flags +global_header -shortest -s 1920x1080 -y out.mp4I just want the same control, using fade in/out.
The following almost works as I’d like but I obviously don’t want the entire output stream to fade out. I realize that adding the fade=out to lines 7, 8 & 9 is fading the combined output (starting at line 7), but this is as close as I’ve come where I see each overlay image actually fading. The defined fades in lines 3, 4 and 5 apparently don’t affect anything, and that’s where I defined them originally. When I copied them to the output stream, the fade works on each overlay image, but again I don’t want it to affect the entire output stream, just the individual overlays.
ffmpeg -i vid1.mp4 -loop 1 -i img1.png -i img2.png -i img3.png -i img4.png -filter_complex
"[1:v]fade=out:st=3:d=1[watermark0];
[2:v]fade=out:st=4:d=1[watermark1];
[3:v]fade=out:st=5:d=1[watermark2];
[4:v]fade=out:st=6:d=1[watermark3];
[0:v][watermark0] overlay=0:0 [tmp0];
[tmp0][watermark1] overlay=0:0,fade=out:st=4:d=1 [tmp1];
[tmp1][watermark2] overlay=0:0,fade=out:st=6:d=1 [tmp2];
[tmp2][watermark3] overlay=0:0,fade=out:st=8:d=1 [out]" -map "[out]" -c:v libx264 -c:a copy
-flags +global_header -shortest -s 1920x1080 -y out.mp4I’ve also tried ’split’ with similar results to the above, but the fade only seems to work on the first image (this one uses fade in as well) :
ffmpeg -i vid.mp4 -loop 1 -i img1.png -i img2.png -i img3.png -i img4.png -filter_complex
"[1:v]split=4[wm1][wm2][wm3][wm4];
[wm1]fade=in:st=1:d=1:alpha=1,fade=out:st=3:d=1:alpha=1[ovr1];
[wm2]fade=in:st=2:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[ovr2];
[wm3]fade=in:st=3:d=1:alpha=1,fade=out:st=5:d=1:alpha=1[ovr3];
[wm4]fade=in:st=4:d=1:alpha=1,fade=out:st=6:d=1:alpha=1[ovr4];
[0:v][ovr1]overlay=0:0[base1];
[base1][ovr2]overlay=0:0[base2];
[base2][ovr3]overlay=0:0[base3];
[base3][ovr4]overlay=0:0[out]" -map "[out]"
-t 10 -c:v libx264 -c:a copy -flags +global_header -shortest -s 1920x1080 -y out.mp4Any help is greatly appreciated ! :)
-
How do I independently fade in/out multiple (3+) overlay images over video using FFMPEG ?
3 mars 2017, par blahblahberUsing an arbitrary source video, I would like to INDEPENDENTLY fade in/fade out a minimum of three .png overlays/watermarks at various times throughout the video. I’m having trouble getting the syntax right for the filter chain.
In these failed attempts below, I’m using four transparent .png images all at 1920x1080 using the same sized source input video. No scaling/positioning needed, just the overlays fading in and out at the defined times.
I have the functionality working without fade, unsing ’enable’, like so :
ffmpeg -i vid1.mp4 -loop 1 -i img1.png -i img2.png -i img3.png -i img4.png -filter_complex
"overlay=0:0:enable='between(t,8,11)' [tmp];
[tmp]overlay=0:0:enable='between(t,10,15)'[tmp1];
[tmp1]overlay=0:0:enable='between(t,15,138)'[tmp2];
[tmp2]overlay=0:0:enable='between(t,140,150)"
-c:v libx264 -c:a copy
-flags +global_header -shortest -s 1920x1080 -y out.mp4I just want the same control, using fade in/out.
The following almost works as I’d like but I obviously don’t want the entire output stream to fade out. I realize that adding the fade=out to lines 7, 8 & 9 is fading the combined output (starting at line 7), but this is as close as I’ve come where I see each overlay image actually fading. The defined fades in lines 3, 4 and 5 apparently don’t affect anything, and that’s where I defined them originally. When I copied them to the output stream, the fade works on each overlay image, but again I don’t want it to affect the entire output stream, just the individual overlays.
ffmpeg -i vid1.mp4 -loop 1 -i img1.png -i img2.png -i img3.png -i img4.png -filter_complex
"[1:v]fade=out:st=3:d=1[watermark0];
[2:v]fade=out:st=4:d=1[watermark1];
[3:v]fade=out:st=5:d=1[watermark2];
[4:v]fade=out:st=6:d=1[watermark3];
[0:v][watermark0] overlay=0:0 [tmp0];
[tmp0][watermark1] overlay=0:0,fade=out:st=4:d=1 [tmp1];
[tmp1][watermark2] overlay=0:0,fade=out:st=6:d=1 [tmp2];
[tmp2][watermark3] overlay=0:0,fade=out:st=8:d=1 [out]" -map "[out]" -c:v libx264 -c:a copy
-flags +global_header -shortest -s 1920x1080 -y out.mp4I’ve also tried ’split’ with similar results to the above, but the fade only seems to work on the first image (this one uses fade in as well) :
ffmpeg -i vid.mp4 -loop 1 -i img1.png -i img2.png -i img3.png -i img4.png -filter_complex
"[1:v]split=4[wm1][wm2][wm3][wm4];
[wm1]fade=in:st=1:d=1:alpha=1,fade=out:st=3:d=1:alpha=1[ovr1];
[wm2]fade=in:st=2:d=1:alpha=1,fade=out:st=4:d=1:alpha=1[ovr2];
[wm3]fade=in:st=3:d=1:alpha=1,fade=out:st=5:d=1:alpha=1[ovr3];
[wm4]fade=in:st=4:d=1:alpha=1,fade=out:st=6:d=1:alpha=1[ovr4];
[0:v][ovr1]overlay=0:0[base1];
[base1][ovr2]overlay=0:0[base2];
[base2][ovr3]overlay=0:0[base3];
[base3][ovr4]overlay=0:0[out]" -map "[out]"
-t 10 -c:v libx264 -c:a copy -flags +global_header -shortest -s 1920x1080 -y out.mp4Any help is greatly appreciated ! :)
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