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Médias (91)
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999,999
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Audio
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The Slip - Artworks
26 septembre 2011, par
Mis à jour : Septembre 2011
Langue : English
Type : Texte
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Demon seed (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
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The four of us are dying (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
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Corona radiata (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
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Lights in the sky (wav version)
26 septembre 2011, par
Mis à jour : Avril 2013
Langue : English
Type : Audio
Autres articles (112)
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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 ) (...) -
Publier sur MédiaSpip
13 juin 2013Puis-je poster des contenus à partir d’une tablette Ipad ?
Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir
Sur d’autres sites (6069)
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Avoiding ffmpeg audio drift for live dash output
22 mai 2021, par mdaleHave people experienced playback drift with ffmpeg based dash segment generation ? For example :


ffmpeg -threads 2 -re -fflags +genpts -stream_loop -1 -i AVSyncTest.mp4 \
-af "aresample=async=1:min_hard_comp=0.100000:first_pts=0" \
-c:v:0 libx264 \
-pix_fmt:0 yuv420p \
-preset:0 medium \
-a53cc:0 1 \
-nal-hrd:0 cbr \
-x264opts:0 scenecut=-1:rc_lookahead=0 -b:v:0 5000k -bufsize:0 500k \
-force_key_frames:0 "expr:gte(t,n_forced*2)" \
-bf:0 8 \
-r 30 \
-c:a:0 aac -ar 48000 \
-b:a:1 96k \
-f tee -map 0:v \
-map 0:a "[f=dash:media_seg_name='chunk-stream_\$RepresentationID\$-\$Number%05d\$.mp4':init_seg_name='init-stream_\$RepresentationID\$.mp4':seg_duration=2:utc_timing_url=https\\\://time.akamai.com\\?iso:remove_at_exit=0:use_timeline=0:http_user_agent=ffmpeg_encoder.0:streaming=1:index_correction=1:timeout=1:dash_segment_type=mp4:method=PUT:http_persistent=1:adaptation_sets='id=0,streams=v\:0 id=1,streams=a' ]http://localhost:5000/out.mpd "



After a bit of playback it starts audio starts to drift. Analysis of the moof (with tools like mp4box) shows 1024 sample size with 93 Moofs with Moof->traf->default_sample_duration=1024 at 48000 sample rate giving segment duration of 1.984 seconds with every 3rd segment or so with 92 Moofs with duration of 1.962 … While each segment starts aligned ( if you reset playback you get alignment) it drifts against continuous playback.


Other examples like Akamai’s public stream. show 94 Moofs or 2.005 duration with every 3rd segment or so at the 1.984 duration. (what one would want)


Akamai’s (presumably ffmepg based) stream is averaging out to the 2s target where the above ffmpeg command is not …


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dash.js : four channels audio streaming
19 juillet 2016, par Carlos ChaconDoes dash.js supports 4 channels in the audio stream ?
I’m using mp4 container : video : h254 and audio : AAC.
For the case that the AAC audio stream is 2 channels it works fine, both video and audio play correctly. But 4 channels does NOT work.
I’m using FFMPEG to create the files and WOWZA to setup the DASH streaming.
For the case that the AAC audio stream is 4 channels I get the following error :
Video can't be played because the file is corrupt.
Command line to generate the 2-channels file :
ffmpeg -i video_in.mp4 -i audio_in_4ch.wav -c:v copy -c:a aac -ac 2 output_2channels.mp4
Command line to generate the 4-channels file :
ffmpeg -i video_in.mp4 -i audio_in_4ch.wav -c:v copy -c:a aac -ac 4 output_4channels.mp4
This is the fmmpeg -i information printed for each file :
2 Channels output file details :
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output_2channels.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.37.101
Duration: 00:00:17.59, start: 0.000000, bitrate: 901 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1024x512 [SAR 1:1 DAR 2:1], 894 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 129 kb/s (default)
Metadata:
handler_name : SoundHandler4 Channels output file details :
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'output_4channels.mp4':
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf57.37.101
Duration: 00:00:17.59, start: 0.000000, bitrate: 1038 kb/s
Stream #0:0(eng): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1024x512 [SAR 1:1 DAR 2:1], 894 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, 4.0, fltp, 265 kb/s (default)
Metadata:
handler_name : SoundHandler4 Channels output file mdp file :
<?xml version="1.0" encoding="UTF-8"?>
<mpd xmlns="urn:mpeg:dash:schema:mpd:2011" profiles="urn:mpeg:dash:profile:isoff-live:2011" type="static" publishtime="2016-07-19T05:56:28Z" mediapresentationduration="PT17.585S" minbuffertime="PT1.5S">
<programinformation>
</programinformation>
<location>http://192.168.0.103:1935/vod/_definst_/mp4:output_4channels.mp4/manifest_w882219731.mpd</location>
<period start="PT0.0S">
<baseurl>http://192.168.0.103:1935/vod/_definst_/mp4:output_4channels.mp4/</baseurl>
<adaptationset mimetype="video/mp4" width="1024" height="512" par="1024:512" framerate="30000/1001" segmentalignment="true" startwithsap="1" subsegmentalignment="true" subsegmentstartswithsap="1">
<segmenttemplate presentationtimeoffset="0" timescale="90000" media="chunk_ctvideo_rid$RepresentationID$_cs$Time$_w882219731_mpd.m4s" initialization="chunk_ctvideo_rid$RepresentationID$_cinit_w882219731_mpd.m4s">
<segmenttimeline>
<s t="0" d="1582650"></s>
</segmenttimeline>
</segmenttemplate>
<representation codecs="avc1.42c01e" sar="1:1" bandwidth="894760"></representation>
</adaptationset>
<adaptationset mimetype="audio/mp4" lang="eng" segmentalignment="true" startwithsap="1" subsegmentalignment="true" subsegmentstartswithsap="1">
<audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"></audiochannelconfiguration>
<segmenttemplate presentationtimeoffset="0" timescale="48000" media="chunk_ctaudio_rid$RepresentationID$_cs$Time$_w882219731_mpd.m4s" initialization="chunk_ctaudio_rid$RepresentationID$_cinit_w882219731_mpd.m4s">
<segmenttimeline>
<s t="0" d="844080"></s>
</segmenttimeline>
</segmenttemplate>
<representation codecs="mp4a.40.2" audiosamplingrate="48000" bandwidth="265851">
</representation>
</adaptationset>
</period>
</mpd>HTML Player Code :
<code class="echappe-js"><script src="http://cdn.dashjs.org/latest/dash.all.min.js"></script>
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MPEG DASH (MPD) to MP4 in Node.js ?
28 janvier 2024, par Hello WorldI am trying to convert streams to .mp4 files. I have successfully converted an HLS to MP4 using
fluent-ffmpeg
package on version 2.1.2. I did so with with the following code :

var ffmpegCommand = ffmpeg();
 ffmpegCommand
 .input(HLS FILE HERE)
 .inputOptions('-protocol_whitelist file,http,https,tcp,tls,crypto,data')
 .on("error", (err, stdout, stderr) => {
 console.log(err)
 let error = new Error(err.message)
 error.code = err.code || 'FILE_CONVERSION_M3U8_TO_MP3/UNKNOWN_ERROR';
 error.status = err.status || 500;

 console.log('An error occurred: ' + err.message, err, stderr);
 reject(error)
 })
 .on("end", () => {
 console.log(temporaryFilePath2)
 resolve(temporaryFilePath2);
 })
 .on('progress', function(progress) {
 console.log('progress: ' + (progress.percent || 0).toFixed(2) + '%。');
 progressGathering.push((progress.percent || 0).toFixed(2))

 if(progressGathering.length == 10 && progressGathering[9] == 0.00){
 let error = new Error("File is a live stream.")
 error.code = 'FILE_CONVERSION_M3U8_TO_MP3/LIVESTREAM_SUPPORT'
 error.status = 501

 ffmpegCommand.kill()
 reject(error)
 }
 })
 .inputOptions('-allowed_extensions ALL')
 .outputOptions("-c copy")
 .output(temporaryFilePath2)
 .run();

 setTimeout(() => {
 ffmpegCommand.kill();
 let error = new Error("The file selected was too large or the network was hanging. Conversion timeout.")
 error.code = 'FILE_CONVERSION_M3U8_TO_MP3/TIMEOUT'
 error.status = 599;
 reject(error)
 }, 300000) // 5 minutes



However, when I attempt something similar with a mpd file url in the input, I get several errors that are all the same :


ffmpeg exited with code 1: https://dash.akamaized.net/akamai/bbb_30fps/bbb_30fps.mpd: Invalid data found when processing input


Is this something fluent-ffmpeg can't handle ? If so, I would like to know another package that can accomplish this.