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Médias (1)
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The Great Big Beautiful Tomorrow
28 octobre 2011, par
Mis à jour : Octobre 2011
Langue : English
Type : Texte
Autres articles (91)
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Emballe médias : à quoi cela sert ?
4 février 2011, parCe plugin vise à gérer des sites de mise en ligne de documents de tous types.
Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ; -
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 (...) -
De l’upload à la vidéo finale [version standalone]
31 janvier 2010, parLe chemin d’un document audio ou vidéo dans SPIPMotion est divisé en trois étapes distinctes.
Upload et récupération d’informations de la vidéo source
Dans un premier temps, il est nécessaire de créer un article SPIP et de lui joindre le document vidéo "source".
Au moment où ce document est joint à l’article, deux actions supplémentaires au comportement normal sont exécutées : La récupération des informations techniques des flux audio et video du fichier ; La génération d’une vignette : extraction d’une (...)
Sur d’autres sites (3255)
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HTTP : improve performance by reducing forward seeks
30 janvier 2017, par Joel CunninghamHTTP : improve performance by reducing forward seeks
This commit optimizes HTTP performance by reducing forward seeks, instead
favoring a read-ahead and discard on the current connection (referred to
as a short seek) for seeks that are within a TCP window’s worth of data.
This improves performance because with TCP flow control, a window’s worth
of data will be in the local socket buffer already or in-flight from the
sender once congestion control on the sender is fully utilizing the window.Note : this approach doesn’t attempt to differentiate from a newly opened
connection which may not be fully utilizing the window due to congestion
control vs one that is. The receiver can’t get at this information, so we
assume worst case ; that full window is in use (we did advertise it after all)
and that data could be in-flightThe previous behavior of closing the connection, then opening a new
with a new HTTP range value results in a massive amounts of discarded
and re-sent data when large TCP windows are used. This has been observed
on MacOS/iOS which starts with an initial window of 256KB and grows up to
1MB depending on the bandwidth-product delay.When seeking within a window’s worth of data and we close the connection,
then open a new one within the same window’s worth of data, we discard
from the current offset till the end of the window. Then on the new
connection the server ends up re-sending the previous data from new
offset till the end of old window.Example (assumes full window utilization) :
TCP window size : 64KB
Position : 32KB
Forward seek position : 40KB* (Next window)
32KB |--------------| 96KB |---------------| 160KB
*
40KB |---------------| 104KBRe-sent amount : 96KB - 40KB = 56KB
For a real world test example, I have MP4 file of 25MB, which ffplay
only reads 16MB and performs 177 seeks. With current ffmpeg, this results
in 177 HTTP GETs and 73MB worth of TCP data communication. With this
patch, ffmpeg issues 4 HTTP GETs and 3 seeks for a total of 22MB of TCP data
communication.To support this feature, the short seek logic in avio_seek() has been
extended to call a function to get the short seek threshold value. This
callback has been plumbed to the URLProtocol structure, which now has
infrastructure in HTTP and TCP to get the underlying receiver window size
via SO_RCVBUF. If the underlying URL and protocol don’t support returning
a short seek threshold, the default s->short_seek_threshold is usedThis feature has been tested on Windows 7 and MacOS/iOS. Windows support
is slightly complicated by the fact that when TCP window auto-tuning is
enabled, SO_RCVBUF doesn’t report the real window size, but it does if
SO_RCVBUF was manually set (disabling auto-tuning). So we can only use
this optimization on Windows in the later caseSigned-off-by : Joel Cunningham <joel.cunningham@me.com>
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc> -
avformat/dashenc : Support HTTP Persistent for master.m3u8 as well
18 octobre 2018, par kjeyapal@akamai.com -
lavf/httpauth : Do case-insensitive http header checks.
3 septembre 2016, par Carl Eugen Hoyos