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Bug de détection d’ogg
22 mars 2013, par
Mis à jour : Avril 2013
Langue : français
Type : Video
Autres articles (57)
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Qu’est ce qu’un éditorial
21 juin 2013, parEcrivez votre de point de vue dans un article. Celui-ci sera rangé dans une rubrique prévue à cet effet.
Un éditorial est un article de type texte uniquement. Il a pour objectif de ranger les points de vue dans une rubrique dédiée. Un seul éditorial est placé à la une en page d’accueil. Pour consulter les précédents, consultez la rubrique dédiée.
Vous pouvez personnaliser le formulaire de création d’un éditorial.
Formulaire de création d’un éditorial Dans le cas d’un document de type éditorial, les (...) -
Gestion des droits de création et d’édition des objets
8 février 2011, parPar défaut, beaucoup de fonctionnalités sont limitées aux administrateurs mais restent configurables indépendamment pour modifier leur statut minimal d’utilisation notamment : la rédaction de contenus sur le site modifiables dans la gestion des templates de formulaires ; l’ajout de notes aux articles ; l’ajout de légendes et d’annotations sur les images ;
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Supporting all media types
13 avril 2011, parUnlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)
Sur d’autres sites (8614)
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lavc/opusdsp : RISC-V V (512-bit) postfilter
5 octobre 2022, par Rémi Denis-Courmontlavc/opusdsp : RISC-V V (512-bit) postfilter
This adds a variant of the postfilter for use with 512-bit vectors.
Half a vector is enough to perform the scalar product. Normally a whole
vector would be used anyhow. Indeed fractional multiplers are no faster
than the unit multipler.But in this particular function, a full vector makes up 16 samples,
which would be loaded at each iteration of the outer loop. The minimum
guaranteed CELT postfilter period is only 15. Accounting for the edges,
we can only safely preload up to 13 samples.The fractional multipler is thus used to cap the selected vector length
to a safe value of 8 elements or 256 bits.Likewise, we have the 1024-bit variant with the quarter multipler. In
theory, a 2048-bit one would be possible with the eigth multipler, but
that length is not even defined in the specifications as of yet, nor is
it supported by any emulator - forget actual hardware. -
How to handle errors during downloading (using videomanifest) video and make it more robust
5 mai 2023, par Wakan TankaI'm using ffmpeg to download videos from streaming site following way :


ffmpeg.exe -i videomanifest -codec copy video.mp4 


This works, but it has some drawbacks. The problem is that sometimes my (or maybe error on server side etc.) internet connection fails, and I'm forced to restart the whole download again. I would like to make this process more robust. It would be great if
ffmpegcan continuously split video to several smaller files during the download and if download will fail thenffmpegwill continue (or maybe skip) from broken part. After downloading all parts I will concat them manually, this is no problem. Please treat above text just like an example, any other solution which will make downloading process more robust is welcomed. Is this possible withffmpeg?

Here is example of
videomanifest(this is not a fully functional file, important url parts were deleted due to privacy, so please treat it as an example for demonstration purposes)

<mpd type="static" maxsegmentduration="PT5.000S" profiles="urn:mpeg:dash:profile:isoff-live:2011" mediapresentationduration="PT0H0M4961.472S" minbuffertime="PT4.500S" xmlns="urn:mpeg:DASH:schema:MPD:2011">
 <baseurl>https://........................</baseurl>
 <period>
 <adaptationset contenttype="audio" mimetype="audio/mp4" segmentalignment="true" bitstreamswitching="true" codecs="mp4a.40.2">
 <contentprotection schemeiduri="urn:mpeg:dash:sea:2012">
 
 
 
 </contentprotection>
 <label>EnhancedAudio</label>
 <segmenttemplate timescale="44100" initialization="videotranscode?provider=Spo&amp;docId=https%3a%2...................">
 <segmenttimeline>
 <s d="221184" r="988"></s>
 <s d="49939"></s>
 </segmenttimeline>
 </segmenttemplate>
 <representation audiosamplingrate="44100" bandwidth="128000" codecs="mp4a.40.2"></representation>
 <representation audiosamplingrate="44100" bandwidth="192000" codecs="mp4a.40.2"></representation>
 </adaptationset>
 <adaptationset contenttype="audio" mimetype="audio/mp4" segmentalignment="true" bitstreamswitching="true" codecs="mp4a.40.2">
 <contentprotection schemeiduri="urn:mpeg:dash:sea:2012">
 
 
 
 </contentprotection>
 <label>OriginalAudio</label>
 <segmenttemplate timescale="44100" initialization="videotranscode?provider=Spo&amp;docId=https%3a%2f%2fstu">
 <segmenttimeline>
 <s d="221184" r="988"></s>
 <s d="49939"></s>
 </segmenttimeline>
 </segmenttemplate>
 <representation audiosamplingrate="44100" bandwidth="128000" codecs="mp4a.40.2"></representation>
 <representation audiosamplingrate="44100" bandwidth="192000" codecs="mp4a.40.2"></representation>
 </adaptationset>
 <adaptationset contenttype="video" mimetype="video/mp4" segmentalignment="true" bitstreamswitching="true" maxframerate="82690000/5512747" maxwidth="1920" maxheight="1080" codecs="avc1.4d0028">
 <contentprotection schemeiduri="urn:mpeg:dash:sea:2012">
 
 
 
 </contentprotection>
 <segmenttemplate timescale="15000" initialization="videotranscode?provider=Spo&amp;docId=https............">
 <segmenttimeline>
 <s d="74999" r="991"></s>
 <s d="22080"></s>
 </segmenttimeline>
 </segmenttemplate>
 <representation width="426" height="240" framerate="82690000/5512747" bandwidth="144000" codecs="avc1.4d401e"></representation>
 <representation width="852" height="480" framerate="82690000/5512747" bandwidth="480000" codecs="avc1.4d001f"></representation>
 <representation width="1280" height="720" framerate="82690000/5512747" bandwidth="1081600" codecs="avc1.4d001f"></representation>
 <representation width="1920" height="1080" framerate="82690000/5512747" bandwidth="2428800" codecs="avc1.4d0028"></representation>
 </adaptationset>
 </period>
</mpd>


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MPEG Dash output generated by FFMPEG not working
8 janvier 2019, par Anto JoyI created a dash output sample_video.mpd file using ffmpeg, but when I tried to play it using dash js the video was just loading and nothing else.
Below is the generated mpd 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" mediapresentationduration="PT1M2.3S" minbuffertime="PT20.0S">
<programinformation>
</programinformation>
<period start="PT0.0S">
<adaptationset contenttype="video" segmentalignment="true" bitstreamswitching="true" lang="und">
<representation mimetype="video/mp4" codecs="avc1.640015" bandwidth="255520" width="426" height="240" framerate="24/1">
<segmenttemplate timescale="12288" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="3">
<segmenttimeline>
<s t="198656" d="69120"></s>
<s d="75264"></s>
<s d="174592"></s>
<s d="122880"></s>
<s d="125440"></s>
</segmenttimeline>
</segmenttemplate>
</representation>
<representation mimetype="video/mp4" codecs="avc1.64001e" bandwidth="726596" width="854" height="480" framerate="24/1">
<segmenttemplate timescale="12288" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="3">
<segmenttimeline>
<s t="198656" d="69120"></s>
<s d="75264"></s>
<s d="174592"></s>
<s d="122880"></s>
<s d="125440"></s>
</segmenttimeline>
</segmenttemplate>
</representation>
<representation mimetype="video/mp4" codecs="avc1.64001f" bandwidth="1433314" width="1280" height="720" framerate="24/1">
<segmenttemplate timescale="12288" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="3">
<segmenttimeline>
<s t="198656" d="69120"></s>
<s d="75264"></s>
<s d="174592"></s>
<s d="122880"></s>
<s d="125440"></s>
</segmenttimeline>
</segmenttemplate>
</representation>
</adaptationset>
<adaptationset contenttype="audio" segmentalignment="true" bitstreamswitching="true" lang="und">
<representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="341000" audiosamplingrate="48000">
<audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="6"></audiochannelconfiguration>
<segmenttemplate timescale="48000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="3">
<segmenttimeline>
<s t="772096" d="270336"></s>
<s d="293888"></s>
<s d="681984"></s>
<s d="480256"></s>
<s d="492544"></s>
</segmenttimeline>
</segmenttemplate>
</representation>
<representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="341000" audiosamplingrate="48000">
<audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="6"></audiochannelconfiguration>
<segmenttemplate timescale="48000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="3">
<segmenttimeline>
<s t="772096" d="270336"></s>
<s d="293888"></s>
<s d="681984"></s>
<s d="480256"></s>
<s d="492544"></s>
</segmenttimeline>
</segmenttemplate>
</representation>
<representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="341000" audiosamplingrate="48000">
<audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="6"></audiochannelconfiguration>
<segmenttemplate timescale="48000" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="3">
<segmenttimeline>
<s t="772096" d="270336"></s>
<s d="293888"></s>
<s d="681984"></s>
<s d="480256"></s>
<s d="492544"></s>
</segmenttimeline>
</segmenttemplate>
</representation>
</adaptationset>
</period>
</mpd>The following is the ffmpeg command that i used to generate multi bitrate video
ffmpeg -y -i sample_video.mp4 ^
-c:v libx264 -x264opts "keyint=24:min-keyint=24:no-scenecut" -r 24 ^
-c:a aac -b:a 128k ^
-bf 1 -b_strategy 0 -sc_threshold 0 -pix_fmt yuv420p ^
-map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 -map 0:v:0 -map 0:a:0 ^
-b:v:0 250k -filter:v:0 "scale=-2:240" -profile:v:0 baseline ^
-b:v:1 750k -filter:v:1 "scale=-2:480" -profile:v:1 main ^
-b:v:2 1500k -filter:v:2 "scale=-2:720" -profile:v:2 high ^
sample_dash.mp4and to generate the mpd file
ffmpeg -y -re -i sample_dash.mp4 ^
-map 0 ^
-use_timeline 1 -use_template 1 -window_size 5 -adaptation_sets
"id=0,streams=v id=1,streams=a" ^
-f dash sample_video.mpdAlso I saw in the chrome network tab that only init-stream4.m4s and init-stream5.m4s was called.
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