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Granite de l’Aber Ildut
9 septembre 2011, par
Mis à jour : Septembre 2011
Langue : français
Type : Texte
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Géodiversité
9 septembre 2011, par ,
Mis à jour : Août 2018
Langue : français
Type : Texte
Autres articles (65)
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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 (...) -
Récupération d’informations sur le site maître à l’installation d’une instance
26 novembre 2010, parUtilité
Sur le site principal, une instance de mutualisation est définie par plusieurs choses : Les données dans la table spip_mutus ; Son logo ; Son auteur principal (id_admin dans la table spip_mutus correspondant à un id_auteur de la table spip_auteurs)qui sera le seul à pouvoir créer définitivement l’instance de mutualisation ;
Il peut donc être tout à fait judicieux de vouloir récupérer certaines de ces informations afin de compléter l’installation d’une instance pour, par exemple : récupérer le (...) -
Les tâches Cron régulières de la ferme
1er décembre 2010, parLa gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
Le super Cron (gestion_mutu_super_cron)
Cette tâche, planifiée chaque minute, a pour simple effet d’appeler le Cron de l’ensemble des instances de la mutualisation régulièrement. Couplée avec un Cron système sur le site central de la mutualisation, cela permet de simplement générer des visites régulières sur les différents sites et éviter que les tâches des sites peu visités soient trop (...)
Sur d’autres sites (7126)
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capture my webcam and encode to mp4 with ffmpeg, but the x264 works bad
17 septembre 2015, par zhangxm1991here is my version :
ffmpeg version : 2.3.3
libx264 version:142.xI wat to capture my video and use ffmpeg and x264 to a mp4 file. the solution is 320x240.
But i found that the video file is so big. Then i found that the P frame and B frame is very big, even nearly equal to the I frame.I do not know why.here is my code :
c->codec_id = codec_id;
c->bit_rate = 400000;
c->width = 320;
c->height = 240;
c->time_base.den = 10;
c->time_base.num = 1;
c->pix_fmt = AV_PIX_FMT_YUV420P;Here is my program output :
[libx264 @ 0xb6200fc0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0xb6200fc0] profile High, level 1.3
[libx264 @ 0xb6200fc0] 264 - core 142 - H.264/MPEG-4 AVC codec - Copyleft 2003-2014 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=6 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=400 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, mp4, to '/home/2014_09_12/0002b6429579/5/2014_09_12_18_39_12_600.mp4':
Stream #0:0: Video: h264 (libx264), yuv420p, 320x240, q=-1--1, 400 kb/s, 10 tbc
Stream #0:1: Audio: aac, 8000 Hz, mono, fltp, 32 kb/s
[mp4 @ 0xb62005e0] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
[mp4 @ 0xb62005e0] Using AVStream.codec.time_base as a timebase hint to the muxer is deprecated. Set AVStream.time_base instead.
[mp4 @ 0xb62005e0] Encoder did not produce proper pts, making some up.
[libx264 @ 0xb6200fc0] frame I:3 Avg QP: 2.79 size: 72996
[libx264 @ 0xb6200fc0] frame P:383 Avg QP: 0.14 size: 54075
[libx264 @ 0xb6200fc0] frame B:216 Avg QP: 1.95 size: 64784
[libx264 @ 0xb6200fc0] consecutive B-frames: 30.1% 63.2% 6.0% 0.7%
[libx264 @ 0xb6200fc0] mb I I16..4: 16.1% 12.7% 71.2%
[libx264 @ 0xb6200fc0] mb P I16..4: 3.5% 5.1% 15.9% P16..4: 20.3% 22.8% 14.0% 0.0% 0.0% skip:18.3%
[libx264 @ 0xb6200fc0] mb B I16..4: 0.4% 2.5% 8.2% B16..8: 32.6% 19.8% 13.5%
direct:22.2% skip: 0.8% L0:25.5% L1:12.8% BI:61.6%
[libx264 @ 0xb6200fc0] final ratefactor: -32.89
[libx264 @ 0xb6200fc0] 8x8 transform intra:21.0% inter:29.6%
[libx264 @ 0xb6200fc0] coded y,uvDC,uvAC intra: 100.0% 100.0% 100.0% inter: 83.3% 80.9% 80.9%
[libx264 @ 0xb6200fc0] i16 v,h,dc,p: 5% 7% 42% 46%
[libx264 @ 0xb6200fc0] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 14% 12% 23% 8% 6% 6% 8% 9% 14%
[libx264 @ 0xb6200fc0] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 12% 11% 19% 10% 8% 8% 10% 10% 12%
[libx264 @ 0xb6200fc0] i8c dc,h,v,p: 78% 3% 4% 15%
[libx264 @ 0xb6200fc0] Weighted P-Frames: Y:0.5% UV:0.3%
[libx264 @ 0xb6200fc0] ref P L0: 43.4% 14.6% 19.0% 22.9% 0.1%
[libx264 @ 0xb6200fc0] ref B L0: 63.3% 35.7% 1.1%
[libx264 @ 0xb6200fc0] ref B L1: 97.0% 3.0%
[libx264 @ 0xb6200fc0] kb/s:4.53
[aac @ 0xb6201ba0] 2 frames left in the queue on closing -
Stream webcam using ffmpeg/avconv to RTMP libx264 doesn't work
15 mars 2016, par Erez Posneri have been trying to stream my webcam to Ustream using RTMP.
using the standard command works great :
"avconv -f video4linux2 -r 25 -s 320x240 -i /dev/video0 -f flv rtmp ://host/pass"
but i encoutner a 15 seconds latency !
therefore i decided to compress the video using libx264.
i downloaded it and confirmed it is installed properly.
but when running this command :"avconv -f video4linux2 -r 25 -s 320x240 -i /dev/video0 -c:v libx264 -pix_fmt yuv420p-f flv rtmp ://host/pass"
on ffmpeg i get "Illegal instruction"
and under avconv it starts to stream but nothing is shown in Ustream channel.output from avconv command
avconv version 9.14-6:9.14-1rpi1rpi1, Copyright (c) 2000-2014 the
Libav developers
built on Jul 22 2014 15:08:12 with gcc 4.6 (Debian 4.6.3-14+rpi1)
[video4linux2 @ 0x709740] The driver changed the time per frame from 1/5 to 1/30
[video4linux2 @ 0x709740] Estimating duration from bitrate, this may
be inaccurate
Input #0, video4linux2, from '/dev/video0':
Duration: N/A, start: 5069.991764, bitrate: 36864 kb/s
Stream #0.0: Video: rawvideo, yuyv422, 320x240, 36864 kb/s, 1000k tbn, 30 tbc
[libx264 @ 0x70a9e0] using cpu capabilities: none!
[libx264 @ 0x70a9e0] profile High, level 1.2
[libx264 @ 0x70a9e0] 264 - core 130 r2282 1db4621 - H.264/MPEG-4 AVC
codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html -
options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7
psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1
8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2
threads=1 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1
interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2
b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250
keyint_min=5 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=crf
mbtree=1 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.25
aq=1:1.00
Output #0, flv, to
'rtmp:host/pass:
Metadata:
encoder : Lavf54.20.4
Stream #0.0: Video: libx264, yuv420p, 320x240, q=-1--1, 1k tbn, 5 tbc
Stream mapping:
Stream #0:0 -> #0:0 (rawvideo -> libx264)
Press ctrl-c to stop encoding
frame= 44 fps= 3 q=23.0 size= 26kB time=0.20
bitrate=1071.8kbits/s bits/swhat could be the problem ?
thank you in advanced -
Stream from MP4 file over RTSP with ffserver
25 octobre 2019, par sirlionI’m trying to stream a mp4 file over RTSP using ffserver with no luck so far. I just want to stream directly from the file, without feeding from ffmpeg (no transcoding involved). But I’ve made it work with mpg video.
Here is my ffserver config file :
Port 8090
BindAddress 0.0.0.0
MaxHTTPConnections 2000
MaxClients 1000
MaxBandwidth 500000
CustomLog -
NoDaemon
RTSPPort 7654
RTSPBindAddress 0.0.0.0
<stream>
Format rtp
File "/home/g/video_streaming/sample3-mpeg2.mpg"
</stream>
<stream>
Format rtp
File "/home/g/video.mp4"
</stream>When I launch ffserver, everything seems fine based on the log output :
$ ./dev/ffmpeg/ffserver -f ffserver-sample.conf
ffserver version N-45673-gd0c27e8 Copyright (c) 2000-2012 the FFmpeg developers
built on Oct 18 2012 10:36:52 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
configuration:
libavutil 51. 76.100 / 51. 76.100
libavcodec 54. 66.100 / 54. 66.100
libavformat 54. 33.100 / 54. 33.100
libavdevice 54. 3.100 / 54. 3.100
libavfilter 3. 19.103 / 3. 19.103
libswscale 2. 1.101 / 2. 1.101
libswresample 0. 16.100 / 0. 16.100
Thu Oct 18 11:54:22 2012 Opening file '/home/g/video.mp4'
Thu Oct 18 11:54:22 2012 Opening file '/home/g/video.mp4'
Thu Oct 18 11:54:23 2012 Opening file '/home/g/video_streaming/sample3-mpeg2.mpg'
Thu Oct 18 11:54:23 2012 [mpeg @ 0x1dae3c0]max_analyze_duration 5000000 reached at 5005000
Thu Oct 18 11:54:23 2012 Opening file '/home/g/video_streaming/sample3-mpeg2.mpg'
Thu Oct 18 11:54:23 2012 [mpeg @ 0x1dae3c0]max_analyze_duration 5000000 reached at 5005000
Thu Oct 18 11:54:23 2012 FFserver started.Finally, if I run ffplay in order to test the server, everything works fine for the mpg file, but not for the mp4 :
$ ffplay rtsp://192.168.1.99:7654/test2-rtsp
ffplay version N-45656-g916352f Copyright (c) 2003-2012 the FFmpeg developers
built on Oct 17 2012 16:14:14 with gcc 4.4.5 (Ubuntu/Linaro 4.4.4-14ubuntu5.1)
configuration:
libavutil 51. 76.100 / 51. 76.100
libavcodec 54. 66.100 / 54. 66.100
libavformat 54. 33.100 / 54. 33.100
libavdevice 54. 3.100 / 54. 3.100
libavfilter 3. 19.103 / 3. 19.103
libswscale 2. 1.101 / 2. 1.101
libswresample 0. 16.100 / 0. 16.100
rtsp://192.168.1.99:7654/test2-rtsp: Invalid data found when processing input
Server's output:
Thu Oct 18 11:57:51 2012 FFserver started.
Thu Oct 18 11:58:01 2012 192.168.1.101 - - [DESCRIBE] "rtsp://192.168.1.99:7654/test2-rtsp RTSP/1.0" 200 167
Segmentation fault (core dumped)I don’t really know what I could be missing. I’ve just read in the official doc that streaming from a file is kind of broken. Since I don’t really know if that’s up to date, I decided to give it a try here.
Any help or suggestions ? Alternatives ?