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  • Gestion générale des documents

    13 mai 2011, par

    MédiaSPIP ne modifie jamais le document original mis en ligne.
    Pour chaque document mis en ligne il effectue deux opérations successives : la création d’une version supplémentaire qui peut être facilement consultée en ligne tout en laissant l’original téléchargeable dans le cas où le document original ne peut être lu dans un navigateur Internet ; la récupération des métadonnées du document original pour illustrer textuellement le fichier ;
    Les tableaux ci-dessous expliquent ce que peut faire MédiaSPIP (...)

  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

Sur d’autres sites (6252)

  • Getting either incorrect output resolution or FPS from ffmpeg

    5 novembre 2011, par Adam

    I am capturing an RTSP stream from a security camera, and transcoding it for (live streaming) to iphone, using OSX as the encoding platform.
    I have it working correctly, and Im tuning it.
    However, it seems that it is not outputting the requested resolution. This is my script

    /Applications/SecurityCamera/openRTSP -v -c -t rtsp://10.0.1.118/ch1-s1 | \
    
    /Applications/SecurityCamera/ffmpeg \
    
    -r 10 -i - \
    
    -y -an -ab 64000 -f mpegts -vcodec copy -s 960x640 \
    
    -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 \
    
    -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16  -keyint_min 25 \
    
    -sc_threshold 40 -i_qfactor 0.71 -bt 400k -maxrate 524288 -bufsize 524288 \
    
    -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 \
    
    -aspect 960:640 -r 10 -g 10 -async 2 -\
    
    |/Applications/SecurityCamera/mediastreamsegmenter -b http://localhost:8080/\
    
      -f /Library/WebServer/Documents/ -i stream.m3u8 -t 10 -s 4 -D

    This is the status report :

    Input #0, h264, from 'pipe:':
    

    
  Duration: N/A, bitrate: N/A
    
  Stream #0.0: Video: h264, yuv420p, 1600x1200, 10 fps, 10 tbr, 1200k tbn, 20 tbc
    
  [mpegts @ 0x10100c200] muxrate VBR, pcr every 1 pkts, sdt every 200, pat/pmt every 40 pkts
    
  Output #0, mpegts, to 'pipe:':
    
  Metadata:
    
    encoder         : Lavf52.93.0
    
    Stream #0.0: Video: libx264, yuv420p, 1600x1200 [PAR 1:1 DAR 4:3], q=2-31, 90k tbn, 10 tbc
    
Stream mapping:
    
  Stream #0.0 -> #0.0

    You can see that its working, but it is outputting 1600x1200 for some reason. (possibly -vcodec copy copies all codec parameters, not just the codec type ?)

    If I change the -vcodec copy to -vcodec libx264 then I get the correct status report (stating 960x640, correct), but the streaming switches to 2 FPS (why ? Im forcing both input and output !) and it halts after 54 frames (see output below)

    Seems stream 0 codec frame rate differs from container frame rate: 20.00 (20/1) -> 10.00 (20/2)
    
Input #0, h264, from 'pipe:':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0.0: Video: h264, yuv420p, 1600x1200, 10 fps, 10 tbr, 1200k tbn, 20 tbc
    
[buffer @ 0x100d02420] w:1600 h:1200 pixfmt:yuv420p
    
[scale @ 0x100d026f0] w:1600 h:1200 fmt:yuv420p -> w:960 h:640 fmt:yuv420p flags:0x4
    
[libx264 @ 0x10100d400] using SAR=1/1
    
[libx264 @ 0x10100d400] frame MB size (60x40) > level limit (1620)
    
[libx264 @ 0x10100d400] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowCTZ SlowAtom
    
[libx264 @ 0x10100d400] profile Constrained Baseline, level 3.0
    
[mpegts @ 0x10100c200] muxrate VBR, pcr every 1 pkts, sdt every 200, pat/pmt every 40 pkts
    
Output #0, mpegts, to 'pipe:':
    
  Metadata:
    
    encoder         : Lavf52.93.0
    
    Stream #0.0: Video: libx264, yuv420p, 960x640 [PAR 1:1 DAR 3:2], q=10-51, 200 kb/s, 90k tbn, 10 tbc
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
read pmap fffps=  3 q=37.0 size=      37kB time=0.10 bitrate=3008.0kbits/s    bits/s    
    
video pid set at 100
    
found sequence start
    
  next segment value 1026000
    
written bytes 376 skipped 0
    
frame=   54 fps=  2 q=-1.0 Lsize=     160kB time=5.40 bitrate= 242.0kbits/s    
    
video:141kB audio:0kB global headers:0kB muxing overhead 12.872737%
    
frame I:6     Avg QP:34.68  size: 23524
    
[libx264 @ 0x10100d400] frame P:48    Avg QP:41.53  size:    75
    
[libx264 @ 0x10100d400] mb I  I16..4: 63.9%  0.0% 36.1%
    
[libx264 @ 0x10100d400] mb P  I16..4:  0.1%  0.0%  0.0%  P16..4:  0.8%  0.1%  0.0%  0.0%  0.0%    skip:99.0%
    
[libx264 @ 0x10100d400] final ratefactor: 38.54
    
[libx264 @ 0x10100d400] coded y,uvDC,uvAC intra: 57.7% 22.3% 2.0% inter: 0.0% 0.1% 0.0%
    
[libx264 @ 0x10100d400] i16 v,h,dc,p: 23% 35% 27% 15%
    
[libx264 @ 0x10100d400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 32% 16%  4%  3%  3%  7%  4%  8%
    
[libx264 @ 0x10100d400] i8c dc,h,v,p: 83% 11%  5%  0%
    
[libx264 @ 0x10100d400] kb/s:214.43

  • Video encoding libraries for iOS

    7 novembre 2011, par peetonn

    I really stucked with that problem, because I haven't seen enough information in the internet regarding video encoding in iOS, however we can observe plenty of apps that deal with the problem of video streaming successfully (skype, qik, justin.tv, etc.)
    I'm going to develop an application, that should send video frames obtained from camera and encoded in h.263 (h.264 or MPEG-4 it is under decision) to a web-server. For this, I need some video encoding library. Obviously, ffmpeg can deal with that task, but it is under LGPL license, which could probably lead to some problems in submitting the app in the AppStore. On the other hand, there are some applications, which are seemed to use ffmpeg library, but only Timelapser clearly states this fact in app description. Does this mean, that other apps are not using ffmpeg or just hiding this information ?

    Please, share your thoughts and experience in this topic. I'm open for dicsussion.

  • Getting either incorrect output resolution or FPS from ffmpeg

    5 novembre 2011, par Adam

    I am capturing an RTSP stream from a security camera, and transcoding it for (live streaming) to iphone, using OSX as the encoding platform.
    I have it working correctly, and Im tuning it.
    However, it seems that it is not outputting the requested resolution. This is my script

    /Applications/SecurityCamera/openRTSP -v -c -t rtsp://10.0.1.118/ch1-s1 | \
    
    /Applications/SecurityCamera/ffmpeg \
    
    -r 10 -i - \
    
    -y -an -ab 64000 -f mpegts -vcodec copy -s 960x640 \
    
    -flags +loop -cmp +chroma -partitions +parti4x4+partp8x8+partb8x8 \
    
    -subq 5 -trellis 1 -refs 1 -coder 0 -me_range 16  -keyint_min 25 \
    
    -sc_threshold 40 -i_qfactor 0.71 -bt 400k -maxrate 524288 -bufsize 524288 \
    
    -qcomp 0.6 -qmin 10 -qmax 51 -qdiff 4 -level 30 \
    
    -aspect 960:640 -r 10 -g 10 -async 2 -\
    
    |/Applications/SecurityCamera/mediastreamsegmenter -b http://localhost:8080/\
    
      -f /Library/WebServer/Documents/ -i stream.m3u8 -t 10 -s 4 -D

    This is the status report :

    Input #0, h264, from 'pipe:':
    

    
  Duration: N/A, bitrate: N/A
    
  Stream #0.0: Video: h264, yuv420p, 1600x1200, 10 fps, 10 tbr, 1200k tbn, 20 tbc
    
  [mpegts @ 0x10100c200] muxrate VBR, pcr every 1 pkts, sdt every 200, pat/pmt every 40 pkts
    
  Output #0, mpegts, to 'pipe:':
    
  Metadata:
    
    encoder         : Lavf52.93.0
    
    Stream #0.0: Video: libx264, yuv420p, 1600x1200 [PAR 1:1 DAR 4:3], q=2-31, 90k tbn, 10 tbc
    
Stream mapping:
    
  Stream #0.0 -> #0.0

    You can see that its working, but it is outputting 1600x1200 for some reason. (possibly -vcodec copy copies all codec parameters, not just the codec type ?)

    If I change the -vcodec copy to -vcodec libx264 then I get the correct status report (stating 960x640, correct), but the streaming switches to 2 FPS (why ? Im forcing both input and output !) and it halts after 54 frames (see output below)

    Seems stream 0 codec frame rate differs from container frame rate: 20.00 (20/1) -> 10.00 (20/2)
    
Input #0, h264, from 'pipe:':
    
  Duration: N/A, bitrate: N/A
    
    Stream #0.0: Video: h264, yuv420p, 1600x1200, 10 fps, 10 tbr, 1200k tbn, 20 tbc
    
[buffer @ 0x100d02420] w:1600 h:1200 pixfmt:yuv420p
    
[scale @ 0x100d026f0] w:1600 h:1200 fmt:yuv420p -> w:960 h:640 fmt:yuv420p flags:0x4
    
[libx264 @ 0x10100d400] using SAR=1/1
    
[libx264 @ 0x10100d400] frame MB size (60x40) > level limit (1620)
    
[libx264 @ 0x10100d400] using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64 SlowCTZ SlowAtom
    
[libx264 @ 0x10100d400] profile Constrained Baseline, level 3.0
    
[mpegts @ 0x10100c200] muxrate VBR, pcr every 1 pkts, sdt every 200, pat/pmt every 40 pkts
    
Output #0, mpegts, to 'pipe:':
    
  Metadata:
    
    encoder         : Lavf52.93.0
    
    Stream #0.0: Video: libx264, yuv420p, 960x640 [PAR 1:1 DAR 3:2], q=10-51, 200 kb/s, 90k tbn, 10 tbc
    
Stream mapping:
    
  Stream #0.0 -> #0.0
    
read pmap fffps=  3 q=37.0 size=      37kB time=0.10 bitrate=3008.0kbits/s    bits/s    
    
video pid set at 100
    
found sequence start
    
  next segment value 1026000
    
written bytes 376 skipped 0
    
frame=   54 fps=  2 q=-1.0 Lsize=     160kB time=5.40 bitrate= 242.0kbits/s    
    
video:141kB audio:0kB global headers:0kB muxing overhead 12.872737%
    
frame I:6     Avg QP:34.68  size: 23524
    
[libx264 @ 0x10100d400] frame P:48    Avg QP:41.53  size:    75
    
[libx264 @ 0x10100d400] mb I  I16..4: 63.9%  0.0% 36.1%
    
[libx264 @ 0x10100d400] mb P  I16..4:  0.1%  0.0%  0.0%  P16..4:  0.8%  0.1%  0.0%  0.0%  0.0%    skip:99.0%
    
[libx264 @ 0x10100d400] final ratefactor: 38.54
    
[libx264 @ 0x10100d400] coded y,uvDC,uvAC intra: 57.7% 22.3% 2.0% inter: 0.0% 0.1% 0.0%
    
[libx264 @ 0x10100d400] i16 v,h,dc,p: 23% 35% 27% 15%
    
[libx264 @ 0x10100d400] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 23% 32% 16%  4%  3%  3%  7%  4%  8%
    
[libx264 @ 0x10100d400] i8c dc,h,v,p: 83% 11%  5%  0%
    
[libx264 @ 0x10100d400] kb/s:214.43

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