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Autres articles (101)
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MediaSPIP 0.1 Beta version
25 avril 2011, parMediaSPIP 0.1 beta is the first version of MediaSPIP proclaimed as "usable".
The zip file provided here only contains the sources of MediaSPIP in its standalone version.
To get a working installation, you must manually install all-software dependencies on the server.
If you want to use this archive for an installation in "farm mode", you will also need to proceed to other manual (...) -
Multilang : améliorer l’interface pour les blocs multilingues
18 février 2011, parMultilang est un plugin supplémentaire qui n’est pas activé par défaut lors de l’initialisation de MediaSPIP.
Après son activation, une préconfiguration est mise en place automatiquement par MediaSPIP init permettant à la nouvelle fonctionnalité d’être automatiquement opérationnelle. Il n’est donc pas obligatoire de passer par une étape de configuration pour cela. -
Le profil des utilisateurs
12 avril 2011, parChaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
L’utilisateur a accès à la modification de profil depuis sa page auteur, un lien dans la navigation "Modifier votre profil" est (...)
Sur d’autres sites (8618)
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Should H.264 bit rate be multiples of 8 ?
31 août 2016, par Dan SharpI’m working on a video platform receiving H.264 video and building an HLS stream (transmuxing the H.264 to Mpeg2 TS segments via calls to ffmpeg).
I wanted to set the bit rate to be about 2000 kbps, but I’m wondering : does it matter if it’s 2000 or 2048 ?
In other words, do things calculate better if the bit rate is multiples of 8, like 512 or 2024 or 2048 ?
I don’t know enough about how the bit rate is used, either on the sending side (camera) or on the processing side (ffmpeg).
From tests... I can’t see any noticeable difference between 2000 and 2048, but maybe one is slightly better than another for the transmuxing and segmenting ?
I welcome any thoughts/advice.
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FFMPEG wmv conversion to flv
25 novembre 2012, par Brandon Grossuttianyone using ffmpeg
I have a fairly simple wmv exported by a user from movie maker with standard output and want to convert to .flv using
C :>ffmpeg -i "E :\Jab Core 4 Recounters.wmv" -vcodec flv "C :\Net Projects\SVN\IntegratedAlgorithmics\src\MediaAdmin\MediaAdmin\bin\Debug\Movies\Jab Core 4 Recounters.flv" -ar 44100
the output / error i receive is
FFmpeg version 0.5, Copyright (c) 2000-2009 Fabrice Bellard, et al.
configuration: --enable-gpl --enable-postproc --enable-swscale --enable-avfilt
er --enable-avfilter-lavf --enable-pthreads --enable-avisynth --enable-libfaac -
-enable-libfaad --enable-libmp3lame --enable-libspeex --enable-libtheora --enabl
e-libvorbis --enable-libxvid --enable-libx264 --enable-memalign-hack
libavutil 49.15. 0 / 49.15. 0
libavcodec 52.20. 0 / 52.20. 0
libavformat 52.31. 0 / 52.31. 0
libavdevice 52. 1. 0 / 52. 1. 0
libavfilter 0. 4. 0 / 0. 4. 0
libswscale 0. 7. 1 / 0. 7. 1
libpostproc 51. 2. 0 / 51. 2. 0
built on Mar 16 2009 16:09:18, gcc: 4.2.4 [Sherpya]
[wmv3 @ 0x1c0d490]Extra data: 8 bits left, value: 0
Seems stream 1 codec frame rate differs from container frame rate: 1000.00 (1000
/1) -> 30.00 (30/1)
Input #0, asf, from 'E:\Jab Core 4 Recounters.wmv':
Duration: 00:01:55.99, start: 5.000000, bitrate: 813 kb/s
Stream #0.0: Audio: wmav2, 48000 Hz, stereo, s16, 192 kb/s
Stream #0.1: Video: wmv3, yuv420p, 640x480, 586 kb/s, 30 tbr, 1k tbn, 1k tbc
Output #0, flv, to 'C:\Net Projects\SVN\IntegratedAlgorithmics\src\MediaAdmin\Me
diaAdmin\bin\Debug\Movies\Jab Core 4 Recounters.flv':
Stream #0.0: Video: flv, yuv420p, 640x480, q=2-31, 200 kb/s, 90k tbn, 30 tbc
Stream #0.1: Audio: libmp3lame, 48000 Hz, stereo, s16, 64 kb/s
Stream mapping:
Stream #0.1 -> #0.0
Stream #0.0 -> #0.1
[wmv3 @ 0x1c0d490]Extra data: 8 bits left, value: 0
[libmp3lame @ 0x1c0d8d0]flv does not support that sample rate, choose from (4410
0, 22050, 11025).
Could not write header for output file #0 (incorrect codec parameters ?)i added th -ar switch when i got the error the first time
the codec info i have on the file is as follows
General
Complete name : E:\Jab Core 4 Recounters.wmv
Format : Windows Media
File size : 11.3 MiB
Duration : 2mn 0s
Overall bit rate mode : Variable
Overall bit rate : 780 Kbps
Maximum Overall bit rate : 949 Kbps
Encoded date : UTC 2009-03-07 07:02:41.121
Writing application : 6.0.6000.16386 / Windows Movie Maker
Application : Windows Movie Maker 6.0.6000.16386
Video
ID : 2
Format : VC-1
Format profile : MP@ML
Codec ID : WMV3
Codec ID/Info : Windows Media Video 9
Codec ID/Hint : WMV3
Duration : 2mn 0s
Bit rate mode : Variable
Bit rate : 587 Kbps
Width : 640 pixels
Height : 480 pixels
Display aspect ratio : 4/3
Frame rate : 30.000 fps
Resolution : 24 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.064
Stream size : 8.46 MiB (75%)
Language : en-us
Audio
ID : 1
Format : WMA2
Format profile : L3
Codec ID : 161
Codec ID/Info : Windows Media Audio 2
Description of the codec : Windows Media Audio 9.2 - VBR Quality 90, 48 kHz, stereo 1-pass VBR
Duration : 2mn 0s
Bit rate mode : Variable
Bit rate : 186 Kbps
Channel(s) : 2 channels
Sampling rate : 48.0 KHz
Resolution : 16 bits
Stream size : 2.68 MiB (24%)
Language : en-usi see alot of people with this issue with so solution or cause
any ideas would be helpful
thanks in advance -
Use opencv to encode into flv, playable by flash player
13 février 2012, par Hemang ShahI've compiled ffmpeg with libx264 using configure options given at 1.
This results in the following codecs being available in ffmpeg :
$ ffmpeg -codecs | grep "264\|flv"
ffmpeg version 0.10 Copyright (c) 2000-2012 the FFmpeg developers
built on Feb 10 2012 13:54:15 with gcc 4.6.1
configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvorbis --enable-libx264 --enable-nonfree --enable-postproc --enable-version3 --enable-x11grab
libavutil 51. 34.101 / 51. 34.101
libavcodec 53. 60.100 / 53. 60.100
libavformat 53. 31.100 / 53. 31.100
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 60.100 / 2. 60.100
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 6.100 / 0. 6.100
libpostproc 52. 0.100 / 52. 0.100
DEVSD flv Flash Video (FLV) / Sorenson Spark / Sorenson H.263
D V D h264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
D V D h264_vdpau H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 (VDPAU acceleration)
EV libx264 libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10
EV libx264rgb libx264 H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 RGBAfter this, I compiled opencv. Here is partial cmake result :
-- Video I/O:
-- DC1394 1.x: NO
-- DC1394 2.x: NO
-- FFMPEG: YES
-- codec: YES
-- format: YES
-- util: YES
-- swscale: YES
-- gentoo-style: YES
-- GStreamer: YES
-- UniCap: NO
-- PvAPI: NO
-- V4L/V4L2: /1
-- Xine: NONow, using opencv's VideoWriter, I tried to encode into flv with the following FOURCC codes :
FLV1, X264While the FLV1 results in a video file not playable by flash player, but playabe by vlc ; X264 produces no results at all.
Here is the console output for X264, resulting in a 0 byte file.Output #0, flv, to 'd.flv' :
Stream #0.0 : Video : [0][0][0][0] / 0x0000, yuv420p, 320x240, q=2-31, 4915 kb/s, 90k tbn, 24 tbcDo you see anything amiss or incorrect ?
thanks,