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Autres articles (72)
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Organiser par catégorie
17 mai 2013, parDans MédiaSPIP, une rubrique a 2 noms : catégorie et rubrique.
Les différents documents stockés dans MédiaSPIP peuvent être rangés dans différentes catégories. On peut créer une catégorie en cliquant sur "publier une catégorie" dans le menu publier en haut à droite ( après authentification ). Une catégorie peut être rangée dans une autre catégorie aussi ce qui fait qu’on peut construire une arborescence de catégories.
Lors de la publication prochaine d’un document, la nouvelle catégorie créée sera proposée (...) -
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 (...) -
Le plugin : Podcasts.
14 juillet 2010, parLe problème du podcasting est à nouveau un problème révélateur de la normalisation des transports de données sur Internet.
Deux formats intéressants existent : Celui développé par Apple, très axé sur l’utilisation d’iTunes dont la SPEC est ici ; Le format "Media RSS Module" qui est plus "libre" notamment soutenu par Yahoo et le logiciel Miro ;
Types de fichiers supportés dans les flux
Le format d’Apple n’autorise que les formats suivants dans ses flux : .mp3 audio/mpeg .m4a audio/x-m4a .mp4 (...)
Sur d’autres sites (2829)
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Speed up start of a stream recording with ffmpeg
15 janvier 2014, par neutronI try to record a video stream (from the web or a local webcam stream) and save it to a .mp4 / .flv file. I use FFmpeg with the version"N-59696-gc0a33c4".
The problem isn't the recording of the stream, it is, how log it tooks to start the recording.
This are the parameters i used to capture the stream (the stream is some random stream I found on the web) :
ffmpeg.exe -i mmsh://live.camstreams.com/cscamscape?MSWMExt=.asf -r 25 -t 60 C:\temp\video.mp4And leads to this output :
ffmpeg.exe -i mmsh://live.camstreams.com/cscams
cape?MSWMExt=.asf -r 25 -t 60 C:\temp\video.mp4
ffmpeg version N-59696-gc0a33c4 Copyright (c) 2000-2014 the FFmpeg developers
built on Jan 8 2014 22:01:50 with gcc 4.8.2 (GCC)
configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
libavutil 52. 62.100 / 52. 62.100
libavcodec 55. 47.100 / 55. 47.100
libavformat 55. 22.102 / 55. 22.102
libavdevice 55. 5.102 / 55. 5.102
libavfilter 4. 0.103 / 4. 0.103
libswscale 2. 5.101 / 2. 5.101
libswresample 0. 17.104 / 0. 17.104
libpostproc 52. 3.100 / 52. 3.100
[wmv3 @ 0275db40] Extra data: 8 bits left, value: 0
Input #0, asf, from 'mmsh://live.camstreams.com/cscamscape?MSWMExt=.asf':
Metadata:
title : Live Fish Cam
WMFSDKNeeded : 0.0.0.0000
DeviceConformanceTemplate: SP
WMFSDKVersion : 11.0.5721.5275
IsVBR : 0
Duration: N/A, start: 3887858.274000, bitrate: 512 kb/s
Stream #0:0(eng): Video: wmv3 (Simple) (WMV3 / 0x33564D57), yuv420p, 640x360
, 512 kb/s, 62.50 tbr, 1k tbn, 1k tbc
[libx264 @ 0275e400] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0275e400] profile High, level 3.0
[libx264 @ 0275e400] 264 - core 140 r2377 1ca7bb9 - H.264/MPEG-4 AVC codec - Cop
yleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deb
lock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 m
e_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chro
ma_qp_offset=-2 threads=12 lookahead_threads=2 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=25 scene
cut=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=1.40 aq=1:1.00
[wmv3 @ 0275db40] Extra data: 8 bits left, value: 0
Output #0, mp4, to 'C:\temp\video.mp4':
Metadata:
title : Live Fish Cam
WMFSDKNeeded : 0.0.0.0000
DeviceConformanceTemplate: SP
WMFSDKVersion : 11.0.5721.5275
IsVBR : 0
encoder : Lavf55.22.102
Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 6
40x360, q=-1--1, 12800 tbn, 25 tbc
Stream mapping:
Stream #0:0 -> #0:0 (wmv3 -> libx264)
Press [q] to stop, [?] for help
frame= 148 fps=0.0 q=28.0 size= 228kB time=00:00:03.60 bitrate= 518.3kbits/
frame= 151 fps=117 q=28.0 size= 236kB time=00:00:03.72 bitrate= 519.2kbits/
frame= 178 fps= 91 q=28.0 size= 298kB time=00:00:04.80 bitrate= 508.3kbits/
frame= 204 fps= 64 q=28.0 size= 347kB time=00:00:05.84 bitrate= 487.4kbits/
...
... And so on ...The problem now is, that it takes around 6-10 seconds until the recording starts after I entered the command.
Is there a way to speed up this process ?
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Speed up start of a stream recording with ffmpeg
12 mai 2021, par neutronI try to record a video stream (from the web or a local webcam stream) and save it to a .mp4 / .flv file. I use FFmpeg with the version"N-59696-gc0a33c4".



The problem isn't the recording of the stream, it is, how log it tooks to start the recording.



This are the parameters i used to capture the stream (the stream is some random stream I found on the web) :



ffmpeg.exe -i mmsh://live.camstreams.com/cscamscape?MSWMExt=.asf -r 25 -t 60 C:\temp\video.mp4



And leads to this output :



ffmpeg.exe -i mmsh://live.camstreams.com/cscams
cape?MSWMExt=.asf -r 25 -t 60 C:\temp\video.mp4
ffmpeg version N-59696-gc0a33c4 Copyright (c) 2000-2014 the FFmpeg developers
 built on Jan 8 2014 22:01:50 with gcc 4.8.2 (GCC)
 configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
eex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvo-aa
cenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libwavp
ack --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
 libavutil 52. 62.100 / 52. 62.100
 libavcodec 55. 47.100 / 55. 47.100
 libavformat 55. 22.102 / 55. 22.102
 libavdevice 55. 5.102 / 55. 5.102
 libavfilter 4. 0.103 / 4. 0.103
 libswscale 2. 5.101 / 2. 5.101
 libswresample 0. 17.104 / 0. 17.104
 libpostproc 52. 3.100 / 52. 3.100
[wmv3 @ 0275db40] Extra data: 8 bits left, value: 0
Input #0, asf, from 'mmsh://live.camstreams.com/cscamscape?MSWMExt=.asf':
 Metadata:
 title : Live Fish Cam
 WMFSDKNeeded : 0.0.0.0000
 DeviceConformanceTemplate: SP
 WMFSDKVersion : 11.0.5721.5275
 IsVBR : 0
 Duration: N/A, start: 3887858.274000, bitrate: 512 kb/s
 Stream #0:0(eng): Video: wmv3 (Simple) (WMV3 / 0x33564D57), yuv420p, 640x360
, 512 kb/s, 62.50 tbr, 1k tbn, 1k tbc
[libx264 @ 0275e400] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX
[libx264 @ 0275e400] profile High, level 3.0
[libx264 @ 0275e400] 264 - core 140 r2377 1ca7bb9 - H.264/MPEG-4 AVC codec - Cop
yleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deb
lock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 m
e_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chro
ma_qp_offset=-2 threads=12 lookahead_threads=2 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=25 scene
cut=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=1.40 aq=1:1.00
[wmv3 @ 0275db40] Extra data: 8 bits left, value: 0
Output #0, mp4, to 'C:\temp\video.mp4':
 Metadata:
 title : Live Fish Cam
 WMFSDKNeeded : 0.0.0.0000
 DeviceConformanceTemplate: SP
 WMFSDKVersion : 11.0.5721.5275
 IsVBR : 0
 encoder : Lavf55.22.102
 Stream #0:0(eng): Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 6
40x360, q=-1--1, 12800 tbn, 25 tbc
Stream mapping:
 Stream #0:0 -> #0:0 (wmv3 -> libx264)
Press [q] to stop, [?] for help
frame= 148 fps=0.0 q=28.0 size= 228kB time=00:00:03.60 bitrate= 518.3kbits/
frame= 151 fps=117 q=28.0 size= 236kB time=00:00:03.72 bitrate= 519.2kbits/
frame= 178 fps= 91 q=28.0 size= 298kB time=00:00:04.80 bitrate= 508.3kbits/
frame= 204 fps= 64 q=28.0 size= 347kB time=00:00:05.84 bitrate= 487.4kbits/
... 
... And so on ...



The problem now is, that it takes around 6-10 seconds until the recording starts after I entered the command.



Is there a way to speed up this process ?


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FFPLAY produces black video output [closed]
28 janvier 2020, par RooterTooterI’m having an issue playing videos with ffplay on an embedded arm device (imx6). The OS is based on yocto sumo and uses the meta-freescale layers for imx6.
I have a number of test videos in different formats that I am sure are formatted correctly (They play fine on my laptop with ffplay). FFMPEG has all the necessary codecs, detects my streams, it plays audio without an issue, but the video is just black.
It’s worth nothing that I’m running X11 and have xterm running, and when ffplay is trying to play, a black box will pop up on the screen in the correct dimensions like it thinks it’s decoding video, but it’s always blank.
$DISPLAY=:0 ffplay test.mp4
ffplay version 3.3.3 Copyright (c) 2003-2017 the FFmpeg developers
built with gcc 7.3.0 (GCC)
configuration: --disable-stripping --enable-pic --enable-shared --enable-pthreads --disable-libxcb --disable-libxcb-shm --disable-libxcb-xfixes --disable-libxcb-shape --enable-nonfree --cross-prefix=arm-poky-linux-gnueabi- --ld='arm-poky-linux-gnueabi-gcc -march=armv7-a -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 --sysroot=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot' --cc='arm-poky-linux-gnueabi-gcc -march=armv7-a -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 --sysroot=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot' --cxx='arm-poky-linux-gnueabi-g++ -march=armv7-a -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 --sysroot=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot' --arch=arm --target-os=linux --enable-cross-compile --extra-cflags=' -O2 -pipe -g -feliminate-unused-debug-types -fdebug-prefix-map=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0=/usr/src/debug/ffmpeg/3.3.3-r0 -fdebug-prefix-map=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot-native= -fdebug-prefix-map=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot= -march=armv7-a -mfpu=neon -mfloat-abi=hard -mcpu=cortex-a9 --sysroot=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot' --extra-ldflags='-Wl,-O1 -Wl,--hash-style=gnu -Wl,--as-needed' --sysroot=/home/builder/imx-yocto-bsp/machine/tmp/work/cortexa9hf-neon-poky-linux-gnueabi/ffmpeg/3.3.3-r0/recipe-sysroot --enable-hardcoded-tables --libdir=/usr/lib --shlibdir=/usr/lib --datadir=/usr/share/ffmpeg --disable-mipsdsp --disable-mipsdspr2 --cpu=cortex-a9 --pkg-config=pkg-config --enable-avcodec --enable-avdevice --enable-avfilter --enable-avformat --enable-avresample --enable-bzlib --enable-gpl --disable-libgsm --disable-indev=jack --disable-libvorbis --enable-lzma --disable-libmp3lame --enable-openssl --enable-postproc --disable-libschroedinger --enable-sdl2 --disable-libspeex --enable-swresample --enable-swscale --enable-libtheora --enable-vaapi --enable-vdpau --enable-libvpx --enable-libx264 --enable-outdev=xv
libavutil 55. 58.100 / 55. 58.100
libavcodec 57. 89.100 / 57. 89.100
libavformat 57. 71.100 / 57. 71.100
libavdevice 57. 6.100 / 57. 6.100
libavfilter 6. 82.100 / 6. 82.100
libavresample 3. 5. 0 / 3. 5. 0
libswscale 4. 6.100 / 4. 6.100
libswresample 2. 7.100 / 2. 7.100
libpostproc 54. 5.100 / 54. 5.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'test.mp4':q= 0B f=0/0
Metadata:
major_brand : isom
minor_version : 512
compatible_brands: isomiso2avc1mp41
encoder : Lavf58.20.100
Duration: 00:00:30.88, start: 0.000000, bitrate: 143 kb/s
Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 320x180, 67 kb/s, 21.08 fps, 21.08 tbr, 16192 tbn, 42.17 tbc (default)
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, mono, fltp, 66 kb/s (default)
Metadata:
handler_name : SoundHandlerI’ve tried h264 and mp2 video with the same results. Has anyone seen this before
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