
Recherche avancée
Médias (1)
-
Richard Stallman et le logiciel libre
19 octobre 2011, par
Mis à jour : Mai 2013
Langue : français
Type : Texte
Autres articles (7)
-
Personnaliser les catégories
21 juin 2013, parFormulaire de création d’une catégorie
Pour ceux qui connaissent bien SPIP, une catégorie peut être assimilée à une rubrique.
Dans le cas d’un document de type catégorie, les champs proposés par défaut sont : Texte
On peut modifier ce formulaire dans la partie :
Administration > Configuration des masques de formulaire.
Dans le cas d’un document de type média, les champs non affichés par défaut sont : Descriptif rapide
Par ailleurs, c’est dans cette partie configuration qu’on peut indiquer le (...) -
Création définitive du canal
12 mars 2010, parLorsque votre demande est validée, vous pouvez alors procéder à la création proprement dite du canal. Chaque canal est un site à part entière placé sous votre responsabilité. Les administrateurs de la plateforme n’y ont aucun accès.
A la validation, vous recevez un email vous invitant donc à créer votre canal.
Pour ce faire il vous suffit de vous rendre à son adresse, dans notre exemple "http://votre_sous_domaine.mediaspip.net".
A ce moment là un mot de passe vous est demandé, il vous suffit d’y (...) -
Submit bugs and patches
13 avril 2011Unfortunately a software is never perfect.
If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
You may also (...)
Sur d’autres sites (3154)
-
System.Diagnostics.Process pipe (vertical bar) not accepted as argument
28 septembre 2019, par empI’m trying to execute this code using System.Diagnostics.Process. It works fine in command line. But in C# it’s failing on the
|
character.var myProcess = new Process();
var p = new ProcessStartInfo();
var sArgs = " -i emp.mp3 -f wav - | neroAacEnc -ignorelength -q 0.5 -if - -of emp.mp4";
p.FileName = "ffmpeg.exe";
p.CreateNoWindow = false;
p.RedirectStandardOutput = false;
p.UseShellExecute = false;
p.Arguments = sArgs;
myProcess.StartInfo = p;
myProcess.Start();
myProcess.WaitForExit();It gives the following error :
Unable to find a suitable output format for ’|’ : Invalid argument
I’ve looked around on stackoverflow and found the following hint but it is also not working :
var psi = new ProcessStartInfo("ffmpeg.exe");
psi.Arguments =
"\"-i emp.mp3 -f wav -\" | \"neroAacEnc -ignorelength -q 0.5 -if - -of emp.mp4\"";
psi.CreateNoWindow = false;
psi.UseShellExecute = false;
var process = new Process { StartInfo = psi };
process.Start();
process.WaitForExit();gives the following error :
Unrecognized option ’i emp.mp3 -f wav -’
Failed to set value ’|’ for option ’i emp.mp3 -f wav -’ -
How to correctly calculate which segments are ready to be downloaded using MPEG-DASH
24 avril 2019, par igal kWhat i’m trying to do ?
Write a simple MPEG-DASH client using the
SegmentTemplate
pattern to calculate which segments are ready to be downloaded for a live source.A picture taken using
chrome
’s debugging tools at a momentX
showing anmpd
request(8af651fd747.....mpd
) and the actual segments fetched respectfully to that request.Given the following
MPD
<mpd availabilitystarttime="2019-04-24T06:43:32Z" maxsegmentduration="PT4.096S" minbuffertime="PT4.096S" minimumupdateperiod="PT15.835S" profiles="urn:mpeg:dash:profile:isoff-live:2011" publishtime="2019-04-24T11:14:01Z" suggestedpresentationdelay="PT11.878S" timeshiftbufferdepth="PT65.536S" type="dynamic" xmlns="urn:mpeg:dash:schema:mpd:2011">
<location>https://content-aaps1.uplynk.com/channel/8af651fd7473474f86a05ffb0a1c8972.mpd?rmt=wv&amp;cid=8af651fd7473474f86a05ffb0a1c8972&amp;oid=600e5c27541344a1bf3818617ad712ce&amp;prettydash=1&amp;exp=1556091088&amp;rn=4138683939&amp;tc=1&amp;ct=c&amp;sig=5fb7f0c18f3f1d2ad4fdee53c02c1e1ed904bc5e8474f4ebf886d209ff7f21c9&amp;pbs=05b6594bcf4b4728ac1094976a80194d</location>
<period start="PT2826.240S">
<adaptationset maxframerate="30" maxheight="720" maxwidth="1280" mimetype="video/mp4" segmentalignment="true" startwithsap="1">
<representation bandwidth="2604473" codecs="avc1.64001e" framerate="30" height="360" scantype="progressive" width="640">
<baseurl>https://x-default-stgec.uplynk.com/aapm/slices/8c1/600e5c27541344a1bf3818617ad712ce/8c1027496a964b049f1bd5895f8f0412/</baseurl>
<segmenttemplate duration="368640" initialization="https://x-default-stgec.uplynk.com/aapm/slices/8c1/600e5c27541344a1bf3818617ad712ce/8c1027496a964b049f1bd5895f8f0412/$RepresentationID$_init.mp4?pbs=05b6594bcf4b4728ac1094976a80194d&amp;_jt=l&amp;chid=8af651fd7473474f86a05ffb0a1c8972" media="$RepresentationID$$Number%08d$.m4f?pbs=05b6594bcf4b4728ac1094976a80194d&amp;_jt=l&amp;chid=8af651fd7473474f86a05ffb0a1c8972" presentationtimeoffset="254361599" startnumber="690" timescale="90000"></segmenttemplate>
</representation>
</adaptationset>
</period>
<utctiming schemeiduri="urn:mpeg:dash:utc:http-iso:2014" value="https://content-aaps1.uplynk.com/misc/utcservertime"></utctiming>
</mpd>I see that the next segment request should be #3955
What i have tried so far
period.end = 1556104456;
period.start = 2826;
availability_start_time = 1556088212;
max_segment_duration = 4;
time_shift_buffer_depth = 65So, first of all, i read DASH-IF-IOP 4.3 section
4.3.4.2
page #82 and implemented the following code :int k1 = 1;
int period_duration = period.end - (period.start + data_.availability_start_time);
int k2 = ceil((float)period_duration / (float)data_.max_segment_duration);
double duration = ((float)representation.duration / (float)representation.timeScale);
size_t live_edge = std::min(
(int)floor((float)((data_.publish_time - data_.availability_start_time - period.start) / duration)), k2);
size_t oldest = std::max(k1, (int)floor((float)((data_.publish_time - data_.availability_start_time - period.start -
data_.time_shift_buffer_depth) /
duration)));after calculating everything :
k1=1
, k2=3355
,live_edge=3272
andoldest=3256
Also tried using
ffmpeg
’sdashdec.c
for min_segment :
if (c->is_live && pls->fragment_duration)
{
num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) - c->time_shift_buffer_depth) * pls->fragment_timescale) / pls->fragment_duration;
}for max_segment :
num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time)) * pls->fragment_timescale) / pls->fragment_duration;
after a small modification :
size_t pmax = (((data_.publish_time - data_.availability_start_time))) / duration;
size_t pmin = ((data_.publish_time - data_.availability_start_time) - data_.time_shift_buffer_depth) / duration;pmin=3946
pmax=3961
in the ffmpeg example, i had to manually remove the
first_seq_no
variable because it looked like i doubled added theSegmentTemplate@StartNumber
.even after succeeding in this task, how do i exactly build the request list of
Segment(NOW)
---->Segment(LIVE_EDGE)
-
Shaka Player : ignore empty AdaptationSet
24 juin 2019, par MityaI’m trying to play DASH stream in Shaka Player.
Sometimes the stream doesn’t have an audio source and its manifest file contains an emptyAdaptationSet
entry.
In this case Shaka Player returns the manifest parsing error :| DASH_EMPTY_ADAPTATION_SET | 4003 | number | The DASH Manifest contained an AdaptationSet with no Representations. |
Is it possible to ignore this error somehow and play the video without audio source ?
Example of manifest 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="dynamic" minimumupdateperiod="PT4S" suggestedpresentationdelay="PT4S" availabilitystarttime="2019-06-24T13:38:04Z" publishtime="2019-06-24T13:38:34Z" timeshiftbufferdepth="PT14.9S" minbuffertime="PT9.9S">
<programinformation>
</programinformation>
<period start="PT0.0S">
<adaptationset contenttype="video" segmentalignment="true" bitstreamswitching="true">
<representation mimetype="video/mp4" codecs="avc1.640028" bandwidth="2000000" width="1920" height="1080" framerate="20/1">
<segmenttemplate timescale="10240" initialization="init-stream$RepresentationID$.m4s" media="chunk-stream$RepresentationID$-$Number%05d$.m4s" startnumber="5">
<segmenttimeline>
<s t="201697" d="51190" r="2"></s>
</segmenttimeline>
</segmenttemplate>
</representation>
</adaptationset>
<adaptationset contenttype="audio" segmentalignment="true" bitstreamswitching="true">
</adaptationset>
</period>
</mpd>