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  • Publier sur MédiaSpip

    13 June 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • MediaSPIP Core : La Configuration

    9 November 2010, by

    MediaSPIP Core fournit par défaut trois pages différentes de configuration (ces pages utilisent le plugin de configuration CFG pour fonctionner) : une page spécifique à la configuration générale du squelettes; une page spécifique à la configuration de la page d’accueil du site; une page spécifique à la configuration des secteurs;
    Il fournit également une page supplémentaire qui n’apparait que lorsque certains plugins sont activés permettant de contrôler l’affichage et les fonctionnalités spécifiques de (...)

  • Configuration spécifique pour PHP5

    4 February 2011, by

    PHP5 est obligatoire, vous pouvez l’installer en suivant ce tutoriel spécifique.
    Il est recommandé dans un premier temps de désactiver le safe_mode, cependant, s’il est correctement configuré et que les binaires nécessaires sont accessibles, MediaSPIP devrait fonctionner correctement avec le safe_mode activé.
    Modules spécifiques
    Il est nécessaire d’installer certains modules PHP spécifiques, via le gestionnaire de paquet de votre distribution ou manuellement : php5-mysql pour la connectivité avec la (...)

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  • flv reencode to mp4 for iphone/ipod via ffmpeg and x264 (quality issue)

    3 October 2011, by zeroasterisk

    There are a lot of questions on this topic, and I've read most of them and most of the google search results I could come up with.

    When I use FFMPEG to convert a FLV to a iphone3 compatble MP4 file, it just doesn't preserver enough of the quality. Yes, I've worked the hell out of -sameq and -b and -bt settings, text just isn't readable.

    Next I tried to split the video out and process it directly, using these instructions:
    https://sites.google.com/site/linuxencoding/x264-encoding-guide

    The problem is myplayer (via ffmpeg) was not able to determine the duration of the FLV (even though the metadata was set).

    (I assume) Because of that unknown duration, when I create the MP4 file, the resulting x264 file plays through super-fast while the audio plays at the normal rate.

    user@server:/tmp# mplayer -nosound -benchmark -sws 9 -vf dsize=640:480:0,scale=0:0,expand=640:480 -vo yuv4mpeg:file=>(x264 --demuxer y4m --crf 0 --preset slow --threads auto --output output.264 - 2>x264.log) 'input.flv'
    
MPlayer 1.0rc4-4.4.5 (C) 2000-2010 MPlayer Team
    
mplayer: could not connect to socket
    
mplayer: No such file or directory
    
Failed to open LIRC support. You will not be able to use your remote control.
    

    
Playing input.flv.
    
libavformat file format detected.
    
[flv @ 0x1202460]Estimating duration from bitrate, this may be inaccurate
    
[lavf] stream 0: video (vp6f), -vid 0
    
[lavf] stream 1: audio (nellymoser), -aid 0
    
VIDEO:  [VP6F]  1680x992  0bpp  1000.000 fps   33.4 kbps ( 4.1 kbyte/s)
    
Clip info:
    
 audiocodecid: 6
    
 audiodatarate: 86
    
 audiosamplerate: 44100
    
 audiosamplesize: 16
    
 audiosize: 6097005
    
 canSeekToEnd: true
    
 datasize: 8609138
    
 duration: 567
    
 framerate: 2
    
 hasAudio: true
    
 hasCuePoints: false
    
 hasKeyframes: true
    
 hasMetadata: true
    
 hasVideo: true
    
 height: 992
    
 lasttimestamp: 567
    
 metadatacreator: flvtool++ (Facebook, Motion project, dweatherford)
    
 stereo: false
    
 totalframes: 1043
    
 videocodecid: 4
    
 videodatarate: 33
    
 videosize: 2316256
    
 width: 1680
    
Using (default) progressive frame mode.Opening video filter: [expand w=640 h=480]
    
Expand: 640 x 480, -1 ; -1, osd: 0, aspect: 0.000000, round: 1
    
Opening video filter: [scale w=0 h=0]
    
Opening video filter: [dsize=640:480:0]
    
==========================================================================
    
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
    
Selected video codec: [ffvp6f] vfm: ffmpeg (FFmpeg VP6 Flash)
    
==========================================================================
    
Audio: no sound
    
Starting playback...
    
Movie-Aspect is undefined - no prescaling applied.
    
[swscaler @ 0x7f0c738b9620]Lanczos scaler, from yuv420p to yuv420p using MMX2
    
VO: [yuv4mpeg] 640x480 => 641x480 Planar YV12

    I have also tried specifying FPS, but no change in results

    user@server:/tmp# mplayer -nosound -fps 25-benchmark -sws 9 -vf dsize=640:480:0,scale=0:0,expand=640:480 -vo yuv4mpeg:file=>(x264 --demuxer y4m --fps 25 --crf 0 --preset slow --threads auto --output output.264 - 2>x264.log) 'input.flv'

    Can someone tell me how to either:

    1. fix my split A/V processing/timing/duration issues?
    2. improve the
      quality of the FFMPEG conversion of FLV to iphone3 compatible
      format?

  • flv reencode to mp4 for iphone/ipod via ffmpeg and x264 (quality issue)

    3 October 2011, by zeroasterisk

    There are a lot of questions on this topic, and I've read most of them and most of the google search results I could come up with.

    When I use FFMPEG to convert a FLV to a iphone3 compatble MP4 file, it just doesn't preserver enough of the quality. Yes, I've worked the hell out of -sameq and -b and -bt settings, text just isn't readable.

    Next I tried to split the video out and process it directly, using these instructions:
    https://sites.google.com/site/linuxencoding/x264-encoding-guide

    The problem is myplayer (via ffmpeg) was not able to determine the duration of the FLV (even though the metadata was set).

    (I assume) Because of that unknown duration, when I create the MP4 file, the resulting x264 file plays through super-fast while the audio plays at the normal rate.

    user@server:/tmp# mplayer -nosound -benchmark -sws 9 -vf dsize=640:480:0,scale=0:0,expand=640:480 -vo yuv4mpeg:file=>(x264 --demuxer y4m --crf 0 --preset slow --threads auto --output output.264 - 2>x264.log) 'input.flv'
    
MPlayer 1.0rc4-4.4.5 (C) 2000-2010 MPlayer Team
    
mplayer: could not connect to socket
    
mplayer: No such file or directory
    
Failed to open LIRC support. You will not be able to use your remote control.
    

    
Playing input.flv.
    
libavformat file format detected.
    
[flv @ 0x1202460]Estimating duration from bitrate, this may be inaccurate
    
[lavf] stream 0: video (vp6f), -vid 0
    
[lavf] stream 1: audio (nellymoser), -aid 0
    
VIDEO:  [VP6F]  1680x992  0bpp  1000.000 fps   33.4 kbps ( 4.1 kbyte/s)
    
Clip info:
    
 audiocodecid: 6
    
 audiodatarate: 86
    
 audiosamplerate: 44100
    
 audiosamplesize: 16
    
 audiosize: 6097005
    
 canSeekToEnd: true
    
 datasize: 8609138
    
 duration: 567
    
 framerate: 2
    
 hasAudio: true
    
 hasCuePoints: false
    
 hasKeyframes: true
    
 hasMetadata: true
    
 hasVideo: true
    
 height: 992
    
 lasttimestamp: 567
    
 metadatacreator: flvtool++ (Facebook, Motion project, dweatherford)
    
 stereo: false
    
 totalframes: 1043
    
 videocodecid: 4
    
 videodatarate: 33
    
 videosize: 2316256
    
 width: 1680
    
Using (default) progressive frame mode.Opening video filter: [expand w=640 h=480]
    
Expand: 640 x 480, -1 ; -1, osd: 0, aspect: 0.000000, round: 1
    
Opening video filter: [scale w=0 h=0]
    
Opening video filter: [dsize=640:480:0]
    
==========================================================================
    
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
    
Selected video codec: [ffvp6f] vfm: ffmpeg (FFmpeg VP6 Flash)
    
==========================================================================
    
Audio: no sound
    
Starting playback...
    
Movie-Aspect is undefined - no prescaling applied.
    
[swscaler @ 0x7f0c738b9620]Lanczos scaler, from yuv420p to yuv420p using MMX2
    
VO: [yuv4mpeg] 640x480 => 641x480 Planar YV12

    I have also tried specifying FPS, but no change in results

    user@server:/tmp# mplayer -nosound -fps 25-benchmark -sws 9 -vf dsize=640:480:0,scale=0:0,expand=640:480 -vo yuv4mpeg:file=>(x264 --demuxer y4m --fps 25 --crf 0 --preset slow --threads auto --output output.264 - 2>x264.log) 'input.flv'

    Can someone tell me how to either:

    1. fix my split A/V processing/timing/duration issues?
    2. improve the
      quality of the FFMPEG conversion of FLV to iphone3 compatible
      format?

  • ffmpeg: VLC won’t open .sdp files generated by ffmpeg

    8 May 2020, by tiredamage42

    TLDR: VLC or Quicktime won’t open .sdp video stream files generated by ffmpeg, even though ffplay does.

    



    Web development and ffmpeg noob, so apologies if I’m using the wrong terminology:

    



    I’m trying to stream my desktop capture (on OSX) using ffmpeg, sending it out via rtp protocol. 
As of right now I’m just testing it out by streaming it over a port in my localhost (4000). And trying to play it locally.

    



    The problem is that when I try and open the .sdp file generated by the ffmpeg command, VLC opens it and immediately stops, no errors or anything, and shows that it has a duration of 0:00. Quicktime won’t event open the file in the first place.

    



    ffplay does play the stream and I can see my desktop in the player window (with a significant loss in quality though). Even so there are a ton of warning and errors that show up intermittently (outlined below)

    



    I’m not sure if it’s a problem in the way I start the ffmpeg stream, the command is after a ton of iterations of trying to just make it work, so my options might be way wrong.

    



    command to 'serve' the desktop capture:

    



    ./ffmpeg -f avfoundation -s 1920x1080 -r 60 -i "1" -an \
-vcodec libx264 -preset ultrafast -tune zerolatency -pix_fmt yuv420p \
-sdp_file video.sdp -rtsp_transport tcp -f rtp rtp://127.0.0.1:4000


    



    SDP file that’s generated with the ffmpeg command:

    



    SDP:
v=0
o=- 0 0 IN IP4 127.0.0.1
s=No Name
c=IN IP4 127.0.0.1
t=0 0
a=tool:libavformat 58.29.100
m=video 4000 RTP/AVP 96
a=rtpmap:96 H264/90000
a=fmtp:96 packetization-mode=1


    



    ffplay command used to play the stream:

    



    ./ffplay -probesize 32 -analyzeduration 0 -sync ext \
-fflags nobuffer -fflags discardcorrupt -flags low_delay -framedrop \
-strict experimental -avioflags direct \
-protocol_whitelist file,rtp,udp -I video.sdp


    



    For a while before ffplay starts I see a bunch of these errors repeating (in red):

    



    [h264 @ 0x7ff6b788de00] non-existing PPS 0 referenced
[h264 @ 0x7ff6b788de00] decode_slice_header error
[h264 @ 0x7ff6b788de00] no frame!


    



    then the window seems to 'catch up' to the stream and actually shows the desktop capture, and I get these errors and warnings on a regular interval:

    



    1- in a yellow warning color:

    



    [sdp @ 0x7fc85b830600] RTP: missed 4 packets
[sdp @ 0x7fc85b830600] max delay reached. need to consume packet


    



    2-in a red error color:

    



    [h264 @ 0x7fc85b02aa00] out of range intra chroma pred mode
[h264 @ 0x7fc85b02aa00] error while decoding MB 132 32


    



    (I have a feeling that the above errors have to do with previewing the desktop capture in the desktop I’m capturing and causing pixels in the display to overflow)

    



    Edit:
So, I solved the issue soon after posting, but will leave this up in case anyone runs into the same problem.

    



    The solution was to remove the top line in the .sdp file that said SDP:

    


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