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• Evolution #2798 : Notification mise à jour SPIP

  9 avril 2015, par b b

  Et hop, voici le patch à jour avec la proposition de Cedric.

  Reste à améliorer le lien. Je pense qu’on pourrait mettre en place sur spip.net une page dont le fonctionnement serait similaire à celle des téléchargements avec une url comme http://www.spip.net/fr_update

  Pour cela, il faut créer un article en fr (pour commencer) qui reprend les propositions de Nicolas par ici :

  http://www.spip.net/ecrire/?exec=rubrique&id_rubrique=151

  Puis modifier le squelette pour qu’il prenne en charge l’url /xx_update par ici :

  http://zone.spip.org/trac/spip-zone/browser/_galaxie_/www.spip.net/squelettes/branches/2008/urls/trad.php#L8

  Ça vous semble convenable ? gogogo ?

• Mozilla Firefox 36 has problems playing my h264 MP4 files

  11 juin 2015, par Wolfgang Pürstner

  I try to convert videos with ffmpeg to mp4 format (h264) Profile : High Level : 3.1 (1280x720 with 30fps), Bitrate 1500k

  The video plays very well in every browser except in Firefox.

  http://5.79.72.89/trailer/trailer.mp4

  At first it needs longer to load and when I seek inside the video most times the video don’t stop to load and never plays again.
  I can see a lot of partial downloads in the developer console. A lot of them are for the initial play and the rest of the requests are during the video load when I seek to a later position.

  

  When I play other h264 Videos (MP4 with similar settings) they play without problems on this server.
  And when I put my video on another webserver (apache) there are the same problems with Firefox.

  For this reason I believe it has to do something with me my conversion.

  My settings :
  Debian 7 (wheezy)
  Webserver : nginx (with 260k bandwidth limit)

  I started converting videos with avconv and switched to ffmpeg because of this problems. But there was no success.
  Meanwhile I tried all options for encoding but there are always the same problems with Firefox. Other videos play well but not mines and I don’t know why.

  Command :

  ffmpeg -i input.mp4 -tune zerolatency -x264opts bitrate=1500:vbv-maxrate=1500:vbv-bufsize=3000:nal-hrd=vbr -codec:v libx264 -profile:v high -level 3.1 -movflags +faststart -pix_fmt yuv420p  -s 1280x720 -r 30 -ac 2 -ar 48000 -codec:a aac -ab 64k -strict experimental -y trailer.mp4
  

  ffmpeg 1.0.10
  libavutil      51. 73.101 / 51. 73.101
  libavcodec     54. 59.100 / 54. 59.100
  libavformat    54. 29.104 / 54. 29.104
  libavdevice    54.  2.101 / 54.  2.101
  libavfilter     3. 17.100 /  3. 17.100
  libswscale      2.  1.101 /  2.  1.101
  libswresample   0. 15.100 /  0. 15.100
  libpostproc    52.  0.100 / 52.  0.100
  

  Mediainfo of the file : trailer.mp4

  General
  Complete name : trailer.mp4
  Format : MPEG-4
  Format profile : Base Media
  Codec ID : isom
  File size : 115 MiB
  Duration : 10mn 34s
  Overall bit rate : 1 516 Kbps
  Movie name : Big Buck Bunny, Sunflower version
  Performer : Blender Foundation 2008, Janus Bager Kristensen 2013
  Composer : Sacha Goedegebure
  Genre : Animation
  Writing application : Lavf54.29.104
  Comment : Creative Commons Attribution 3.0 - http://bbb3d.renderfarming.net
  Video
  
  ID : 1
  
  Format : AVC
  
  Format/Info : Advanced Video Codec
  
  Format profile : High@L3.1
  
  Format settings, CABAC : Yes
  
  Format settings, ReFrames : 4 frames
  
  Codec ID : avc1
  
  Codec ID/Info : Advanced Video Coding
  
  Duration : 10mn 34s
  
  Bit rate : 1 500 Kbps
  
  Width : 1 920 pixels
  
  Height : 1 080 pixels
  
  Display aspect ratio : 16:9
  
  Frame rate mode : Constant
  
  Frame rate : 30.000 fps
  
  Color space : YUV
  
  Chroma subsampling : 4:2:0
  
  Bit depth : 8 bits
  
  Scan type : Progressive
  
  Bits/(Pixel*Frame) : 0.024
  
  Stream size : 109 MiB (95%)
  
  Writing library : x264 core 132
  
  Encoding settings : cabac=1 / ref=4 / 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=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=50 / keyint_min=5 / scenecut=40 / intra_refresh=0 / rc_lookahead=40 / rc=cbr / mbtree=1 / bitrate=1500 / ratetol=1.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=1500 / vbv_bufsize=3000 / nal_hrd=none / ip_ratio=1.40 / aq=1:1.00
  Audio
  
  ID : 2
  
  Format : AAC
  
  Format/Info : Advanced Audio Codec
  
  Format profile : LC
  
  Codec ID : 40
  
  Duration : 10mn 34s
  
  Duration_LastFrame : -11ms
  
  Bit rate mode : Constant
  
  Bit rate : 64.2 Kbps
  
  Channel(s) : 2 channels
  
  Channel positions : Front : L R
  
  Sampling rate : 48.0 KHz
  
  Compression mode : Lossy
  
  Delay relative to video : -2ms
  
  Stream size : 4.85 MiB (4%)
  

  I don’t know what is wrong with my files.

  Update 2015-03-12 :

  If I convert the video without audio stream there is no problem with firefox anymore.

  I updated ffmpeg to 2.6. I used libfaac, aac and libfdk_aac for audio encoding with cbr and vbr but without success.

• Best and latest live video streaming soloution [on hold]

  3 avril 2015, par Ford

  I have read a few old posts on StackOverflow about live video streamins, but as they are from around 2008, i assume things have moved on from then... and wonder if a current thread will be useful to me and others.
  Also looking on google gives lots of stuff, but again i dont know who is best to listen to and who is trying to sell their stuff (not that i am against paying).

  Basically what are the main points i need to know in order to add/develope a feature to a website in order to offer "1 on 1" and "1 to many" MULTIPLE live streaming webcam, with voice and text chat.

  I am quiet competent with PHP, OK with basic JavaScript (of course fine with HTMLL/css), but do not know what code i would need for client side software, or if any "off the shelf" software is suitable.
  I have played with ffmpeg and noticed this offers streaming, but i dont know if it would be suitable or the best available option.?
  I have a dedicated server with virtualization so can add a dedicated box for streaming if needed/better.

  Any info that can point me off in the right direction of how to add a live streaming service to a website would be much appreciated !