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Autres articles (4)
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Les autorisations surchargées par les plugins
27 avril 2010, parMediaspip core
autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs -
Installation en mode ferme
4 février 2011, parLe mode ferme permet d’héberger plusieurs sites de type MediaSPIP en n’installant qu’une seule fois son noyau fonctionnel.
C’est la méthode que nous utilisons sur cette même plateforme.
L’utilisation en mode ferme nécessite de connaïtre un peu le mécanisme de SPIP contrairement à la version standalone qui ne nécessite pas réellement de connaissances spécifique puisque l’espace privé habituel de SPIP n’est plus utilisé.
Dans un premier temps, vous devez avoir installé les mêmes fichiers que l’installation (...) -
Utilisation et configuration du script
19 janvier 2011, parInformations spécifiques à la distribution Debian
Si vous utilisez cette distribution, vous devrez activer les dépôts "debian-multimedia" comme expliqué ici :
Depuis la version 0.3.1 du script, le dépôt peut être automatiquement activé à la suite d’une question.
Récupération du script
Le script d’installation peut être récupéré de deux manières différentes.
Via svn en utilisant la commande pour récupérer le code source à jour :
svn co (...)
Sur d’autres sites (3683)
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lavc/opusdsp : RISC-V V (128-bit) postfilter
5 octobre 2022, par Rémi Denis-Courmontlavc/opusdsp : RISC-V V (128-bit) postfilter
This is implemented for a vector size of 128-bit. Since the scalar
product in the inner loop covers 5 samples or 160 bits, we need a group
multipler of 2.To avoid reconfiguring the vector type, the outer loop, which loads
multiple input samples sticks to the same multipler. Consequently, the
outer loop loads 8 samples per iteration. This is safe since the minimum
period of the CELT codec is 15 samples.The same code would also work, albeit needlessly inefficiently with a
vector length of 256 bits. A proper implementation will follow instead. -
FFMPEG stream to youtube crashing
29 septembre 2022, par jakebWe have a script that runs FFMPEG and broadcasts a tab recording from puppeteer, it will run fine for a period of time, but if the chromium tab from puppeteer ends up doing certain things (playing a youtube video, for example) FFMPEG crashes. It doesn't matter if the video is 4k 60 FPS, or if it's a 480i video from 2009, the result seems to be the same.


This is the FFMPEG command we're running :


ffmpeg -loglevel info -i - -c:v libx264 -b:v 15000k -preset ultrafast -tune animation -force_key_frames "expr:gte(t,n_forced*2)" -sc_threshold 0 -c:a aac -minrate 15000k -s 1920x1080 -r 60 -vsync 1 -max_muxing_queue_size 1024 -max_interleave_delta 0 -f flv -flvflags no_duration_filesize "rtmps://a.rtmps.youtube.com/live2/*****"


This is the output when it crashes :


frame= 6554 fps= 57 q=0.0 size= 17033kB time=00:02:00.02 bitrate=1162. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 6564 fps= 56 q=1.0 size= 17189kB time=00:02:01.02 bitrate=1163. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 6566 fps= 56 q=0.0 size= 17224kB time=00:02:02.05 bitrate=1156. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 6570 fps= 56 q=1.0 size= 17276kB time=00:02:03.07 bitrate=1149. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 6580 fps= 55 q=2.0 size= 17431kB time=00:02:04.10 bitrate=1150. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 6602 fps= 55 q=0.0 size= 17730kB time=00:02:05.12 bitrate=1160. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 6648 fps= 55 q=1.0 size= 18802kB time=00:02:06.12 bitrate=1221. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 6710 fps= 55 q=0.0 size= 18824kB time=00:02:07.15 bitrate=1212. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 6770 fps= 55 q=0.0 size= 19539kB time=00:02:08.17 bitrate=1248. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 6831 fps= 55 q=1.0 size= 19560kB time=00:02:09.19 bitrate=1240. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 7013 fps= 56 q=0.0 size= 21011kB time=00:02:10.39 bitrate=1320. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 7256 fps= 58 q=0.0 size= 22483kB time=00:02:10.52 bitrate=1411. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 7625 fps= 60 q=0.0 size= 24692kB time=00:02:10.58 bitrate=1549. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 7828 fps= 62 q=2.0 size= 25456kB time=00:02:10.82 bitrate=1594. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 7895 fps= 62 q=0.0 size= 35079kB time=00:02:12.03 bitrate=2176. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 7936 fps= 62 q=2.0 size= 42929kB time=00:02:12.83 bitrate=2647. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 7981 fps= 62 q=2.0 size= 53139kB time=00:02:13.53 bitrate=3259. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 8030 fps= 62 q=0.0 size= 63944kB time=00:02:14.32 bitrate=3899. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 8081 fps= 62 q=0.0 size= 74523kB time=00:02:15.16 bitrate=4516. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 8128 fps= 62 q=2.0 size= 84385kB time=00:02:15.94 bitrate=5084. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 8145 fps= 62 q=1.0 size= 87711kB time=00:02:16.24 bitrate=5273. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 8193 fps= 62 q=1.0 size= 98046kB time=00:02:17.01 bitrate=5862. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 8204 fps= 62 q=0.0 size= 100564kB time=00:02:17.27 bitrate=6001. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 8252 fps= 62 q=0.0 size= 110255kB time=00:02:18.04 bitrate=6543. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
frame= 8266 fps= 62 q=2.0 size= 113024kB time=00:02:18.29 bitrate=6695. 5d7095f4-8035-4dc5-85e1-535f90d1935b 
[tls @ 0x563ee0299440] Error in the push function.
av_interleaved_write_frame(): Input/output error
 Last message repeated 2 times
Error writing trailer of rtmps://a.rtmps.youtube.com/live2/****: Input/output error
frame= 8311 fps= 62 q=2.0 Lsize= 123071kB time=00:02:19.02 bitrate=7252.1kbits/s dup=7716 drop=1 speed=1.04x 
video:123035kB audio:202kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
[tls @ 0x563ee0299440] The specified session has been invalidated for some reason.
 Last message repeated 1 times
[libx264 @ 0x563ee026fe80] frame I:70 Avg QP: 0.31 size:221022
[libx264 @ 0x563ee026fe80] frame P:2770 Avg QP: 0.05 size: 29868
[libx264 @ 0x563ee026fe80] frame B:5471 Avg QP: 1.56 size: 6271
[libx264 @ 0x563ee026fe80] consecutive B-frames: 0.8% 1.7% 97.5%
[libx264 @ 0x563ee026fe80] mb I I16..4: 100.0% 0.0% 0.0%
[libx264 @ 0x563ee026fe80] 
mb P I16..4: 1.8% 0.0% 0.0% P16..4: 5.2% 0.0% 0.0% 0.0% 0.0% skip:93.0%
[libx264 @ 0x563ee026fe80] mb B I16..4: 0.1% 0.0% 0.0% B16..8: 0.6% 0.0% 0.0% direct: 2.8% skip:96.5% L0:46.8% L1:38.5% BI:14.7%
[libx264 @ 0x563ee026fe80] final ratefactor: -5.03
[libx264 @ 0x563ee026fe80] coded y,uvDC,uvAC intra: 50.9% 43.8% 40.5% inter: 2.3% 1.8% 1.7%
[libx264 @ 0x563ee026fe80] i16 v,h,dc,p: 53% 30% 4% 12%
[libx264 @ 0x563ee026fe80] i8c dc,h,v,p: 58% 24% 8% 10%
[libx264 @ 0x563ee026fe80] kb/s:7653.50
[aac @ 0x563ee0282500] Qavg: 61059.410
Conversion failed!
[ERROR] 16:33:59 Error: write EPIPE


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Issues with using FFmpeg to generate MPEG-DASH files
26 septembre 2022, par Tina JI am using the following
ffmpegcommand to generate MPEG DASH files and manifest. I usesingle_file 1to have a single file for each representation ; so no chunking. But IDK why when I want to play the manifest using ExoPlayer, the video doesn't play from the beginning (rather it starts from around 50s).

ffmpeg -re -i .\video-h264.mkv -map 0 -map 0 -c:a aac -c:v libx264 -b:v:0 800k -b:v:1 300k -s:v:1 320x170 -profile:v:1 baseline -profile:v:0 main -bf 1 -keyint_min 120 -g 120 -sc_threshold 0 -b_strategy 0 -ar:a:1 22050 -use_timeline 1 -single_file 1 -use_template 1 -window_size 5 -adaptation_sets "id=0,streams=v id=1,streams=a" -f dash out.mpd


What is wrong with this ? Is the manifest correct ? Here is the generated mpd :


<?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="PT1M20.1S" maxsegmentduration="PT5.0S" minbuffertime="PT16.0S">
 <programinformation>
 </programinformation>
 <servicedescription>
 </servicedescription>
 <period start="PT48.0S">
 <adaptationset contenttype="video" startwithsap="1" segmentalignment="true" bitstreamswitching="true" framerate="30/1" maxwidth="960" maxheight="540" par="517072:290799" lang="eng">
 <representation mimetype="video/mp4" codecs="avc1.4d401f" bandwidth="800000" width="960" height="540" sar="32317:32311">
 <baseurl>out-stream0.mp4</baseurl>
 <segmentlist timescale="1000000" duration="5000000" startnumber="7">
 <initialization range="0-832"></initialization>
 <segmenturl mediarange="4800141-5599188" indexrange="4800141-4800192"></segmenturl>
 <segmenturl mediarange="5599189-6243069" indexrange="5599189-5599240"></segmenturl>
 <segmenturl mediarange="6243070-7224302" indexrange="6243070-6243121"></segmenturl>
 <segmenturl mediarange="7224303-8138118" indexrange="7224303-7224354"></segmenturl>
 <segmenturl mediarange="8138119-8232111" indexrange="8138119-8138170"></segmenturl>
 </segmentlist>
 </representation>
 <representation mimetype="video/mp4" codecs="avc1.42c00d" bandwidth="300000" width="320" height="170" sar="549389:581598">
 <baseurl>out-stream2.mp4</baseurl>
 <segmentlist timescale="1000000" duration="5000000" startnumber="7">
 <initialization range="0-832"></initialization>
 <segmenturl mediarange="1782920-2005667" indexrange="1782920-1782971"></segmenturl>
 <segmenturl mediarange="2005668-2229412" indexrange="2005668-2005719"></segmenturl>
 <segmenturl mediarange="2229413-2615209" indexrange="2229413-2229464"></segmenturl>
 <segmenturl mediarange="2615210-2975346" indexrange="2615210-2615261"></segmenturl>
 <segmenturl mediarange="2975347-2999288" indexrange="2975347-2975398"></segmenturl>
 </segmentlist>
 </representation>
 </adaptationset>
 <adaptationset contenttype="audio" startwithsap="1" segmentalignment="true" bitstreamswitching="true" lang="eng">
 <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="69000" audiosamplingrate="44100">
 <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="1"></audiochannelconfiguration>
 <baseurl>out-stream1.mp4</baseurl>
 <segmentlist timescale="1000000" duration="5000000" startnumber="12">
 <initialization range="0-764"></initialization>
 <segmenturl mediarange="491493-536039" indexrange="491493-491544"></segmenturl>
 <segmenturl mediarange="536040-580657" indexrange="536040-536091"></segmenturl>
 <segmenturl mediarange="580658-625158" indexrange="580658-580709"></segmenturl>
 <segmenturl mediarange="625159-669825" indexrange="625159-625210"></segmenturl>
 <segmenturl mediarange="669826-713289" indexrange="669826-669877"></segmenturl>
 </segmentlist>
 </representation>
 <representation mimetype="audio/mp4" codecs="mp4a.40.2" bandwidth="69000" audiosamplingrate="22050">
 <audiochannelconfiguration schemeiduri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="1"></audiochannelconfiguration>
 <baseurl>out-stream3.mp4</baseurl>
 <segmentlist timescale="1000000" duration="5000000" startnumber="12">
 <initialization range="0-764"></initialization>
 <segmenturl mediarange="486188-530059" indexrange="486188-486239"></segmenturl>
 <segmenturl mediarange="530060-574175" indexrange="530060-530111"></segmenturl>
 <segmenturl mediarange="574176-618922" indexrange="574176-574227"></segmenturl>
 <segmenturl mediarange="618923-663118" indexrange="618923-618974"></segmenturl>
 <segmenturl mediarange="663119-706121" indexrange="663119-663170"></segmenturl>
 </segmentlist>
 </representation>
 </adaptationset>
 </period>
</mpd>


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