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Autres articles (86)

  • Installation en mode ferme

    4 février 2011, par

    Le mode ferme permet d’héberger plusieurs sites de type MediaSPIP en n’installant qu’une seule fois son noyau fonctionnel.
    C’est la méthode que nous utilisons sur cette même plateforme.
    L’utilisation en mode ferme nécessite de connaïtre un peu le mécanisme de SPIP contrairement à la version standalone qui ne nécessite pas réellement de connaissances spécifique puisque l’espace privé habituel de SPIP n’est plus utilisé.
    Dans un premier temps, vous devez avoir installé les mêmes fichiers que l’installation (...)

  • Organiser par catégorie

    17 mai 2013, par

    Dans 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, par

    Utilité
    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 (...)

Sur d’autres sites (5848)

  • swresample/resample : speed up upsampling by precomputing sines

    9 novembre 2015, par Ganesh Ajjanagadde
    swresample/resample : speed up upsampling by precomputing sines

    When upsampling, factor is set to 1 and sines need to be evaluated only
    
once for each phase, and the complexity should not depend on the number
    
of filter taps. This does the desired precomputation, yielding
    
significant speedups. Hard guarantees on the gain are not possible, but gains
    
themselves are obvious and are illustrated below.
    

    Sample benchmark (x86-64, Haswell, GNU/Linux)
    
test : fate-swr-resample-dblp-2626-44100
    
old :
    
29161085 decicycles in build_filter (loop 1000),     256 runs,      0 skips
    
28821467 decicycles in build_filter (loop 1000),     512 runs,      0 skips
    
28668201 decicycles in build_filter (loop 1000),    1000 runs,     24 skips
    

    new :
    
14351936 decicycles in build_filter (loop 1000),     256 runs,      0 skips
    
14306652 decicycles in build_filter (loop 1000),     512 runs,      0 skips
    
14299923 decicycles in build_filter (loop 1000),    1000 runs,     24 skips
    

    Note that this does not statically allocate the sin lookup table. This
    
may be done for the default 1024 phases, yielding a 512*8 = 4kB array
    
which should be small enough.
    
This should yield a small improvement. Nevertheless, this is separate from
    
this patch, is more ambiguous due to the binary increase, and requires a
    
lut to be generated offline.
    

    Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
    
Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
    • [DH] libswresample/resample.c

  • H.264 decoding error log from RTSP stream

    21 septembre 2016, par Tariq

    I am getting the following H264 error log. This log comes while decoding an RTSP video stream with help of FFMPEG. The picture displayed is blurred after 5/6 seconds. The picture would recover it from time to time. However, it remains blurred for most of the time.

    EDIT : Some FFMPEG discussion forums suggested to upgrade FFMPEG version to avoid these logs. I have updated the latest FFMPEG build of June 19, 2015.Still the log remains there and picture is still blurred.

    EDIT 2 : The RTSP stream is coming from a GANZ camera. This camera is connected through a LAN connection.

    [h264 @ 0abb2aa0] Cannot use next picture in error concealment
    
[h264 @ 0abb2aa0] concealing 1933 DC, 1933 AC, 1933 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 131 packets
    
[h264 @ 0abb3300] error while decoding MB 66 25, bytestream (-9)
    
[h264 @ 0abb3300] Cannot use next picture in error concealment
    
[h264 @ 0abb3300] concealing 1583 DC, 1583 AC, 1583 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 8 packets
    
[h264 @ 0b113e40] error while decoding MB 54 30, bytestream (-11)
    
[h264 @ 0b113e40] Cannot use next picture in error concealment
    
[h264 @ 0b113e40] concealing 1195 DC, 1195 AC, 1195 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 118 packets
    
[h264 @ 0ac79960] error while decoding MB 13 20, bytestream (-13)
    
[h264 @ 0ac79960] Cannot use next picture in error concealment
    
[h264 @ 0ac79960] concealing 2036 DC, 2036 AC, 2036 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 198 packets
    
[h264 @ 0ad4f500] error while decoding MB 21 9, bytestream (-5)
    
[h264 @ 0ad4f500] Cannot use next picture in error concealment
    
[h264 @ 0ad4f500] concealing 2908 DC, 2908 AC, 2908 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 108 packets
    
[h264 @ 0abb3300] error while decoding MB 1 14, bytestream (-5)
    
[h264 @ 0abb3300] Cannot use next picture in error concealment
    
[h264 @ 0abb3300] concealing 2528 DC, 2528 AC, 2528 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 106 packets
    
[h264 @ 0b1149c0] error while decoding MB 12 5, bytestream (-7)
    
[h264 @ 0b1149c0] Cannot use next picture in error concealment
    
[h264 @ 0b1149c0] concealing 3237 DC, 3237 AC, 3237 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed -65402 packets
    
[h264 @ 0b1155a0] error while decoding MB 50 38, bytestream (-7)
    
[h264 @ 0b1155a0] Cannot use next picture in error concealment
    
[h264 @ 0b1155a0] concealing 559 DC, 559 AC, 559 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 150 packets
    
[h264 @ 0af65740] error while decoding MB 48 31, bytestream (-15)
    
[h264 @ 0af65740] Cannot use next picture in error concealment
    
[h264 @ 0af65740] concealing 1121 DC, 1121 AC, 1121 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 4 packets
    
[h264 @ 0ac79960] error while decoding MB 35 38, bytestream (-41)
    
[h264 @ 0ac79960] Cannot use next picture in error concealment
    
[h264 @ 0ac79960] concealing 574 DC, 574 AC, 574 MV errors in P frame

    I dumped the RTSP stream to an avi file using ffmpeg and there are no errors.
    C :\Users\Matlab>ffmpeg -i rtsp ://192.168.1.67/gnz_media/main 123.avi

    There are no H.264 decoding errors. Can anybody help with above decoding errors using ffmpeg api.

  • H.264 decoding error log from RTSP stream

    24 janvier 2020, par Tariq

    I am getting the following H264 error log. This log comes while decoding an RTSP video stream with help of FFMPEG. The picture displayed is blurred after 5/6 seconds. The picture would recover it from time to time. However, it remains blurred for most of the time.

    EDIT : Some FFMPEG discussion forums suggested to upgrade FFMPEG version to avoid these logs. I have updated the latest FFMPEG build of June 19, 2015.Still the log remains there and picture is still blurred.

    EDIT 2 : The RTSP stream is coming from a GANZ camera. This camera is connected through a LAN connection.

    [h264 @ 0abb2aa0] Cannot use next picture in error concealment
    
[h264 @ 0abb2aa0] concealing 1933 DC, 1933 AC, 1933 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 131 packets
    
[h264 @ 0abb3300] error while decoding MB 66 25, bytestream (-9)
    
[h264 @ 0abb3300] Cannot use next picture in error concealment
    
[h264 @ 0abb3300] concealing 1583 DC, 1583 AC, 1583 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 8 packets
    
[h264 @ 0b113e40] error while decoding MB 54 30, bytestream (-11)
    
[h264 @ 0b113e40] Cannot use next picture in error concealment
    
[h264 @ 0b113e40] concealing 1195 DC, 1195 AC, 1195 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 118 packets
    
[h264 @ 0ac79960] error while decoding MB 13 20, bytestream (-13)
    
[h264 @ 0ac79960] Cannot use next picture in error concealment
    
[h264 @ 0ac79960] concealing 2036 DC, 2036 AC, 2036 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 198 packets
    
[h264 @ 0ad4f500] error while decoding MB 21 9, bytestream (-5)
    
[h264 @ 0ad4f500] Cannot use next picture in error concealment
    
[h264 @ 0ad4f500] concealing 2908 DC, 2908 AC, 2908 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 108 packets
    
[h264 @ 0abb3300] error while decoding MB 1 14, bytestream (-5)
    
[h264 @ 0abb3300] Cannot use next picture in error concealment
    
[h264 @ 0abb3300] concealing 2528 DC, 2528 AC, 2528 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 106 packets
    
[h264 @ 0b1149c0] error while decoding MB 12 5, bytestream (-7)
    
[h264 @ 0b1149c0] Cannot use next picture in error concealment
    
[h264 @ 0b1149c0] concealing 3237 DC, 3237 AC, 3237 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed -65402 packets
    
[h264 @ 0b1155a0] error while decoding MB 50 38, bytestream (-7)
    
[h264 @ 0b1155a0] Cannot use next picture in error concealment
    
[h264 @ 0b1155a0] concealing 559 DC, 559 AC, 559 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 150 packets
    
[h264 @ 0af65740] error while decoding MB 48 31, bytestream (-15)
    
[h264 @ 0af65740] Cannot use next picture in error concealment
    
[h264 @ 0af65740] concealing 1121 DC, 1121 AC, 1121 MV errors in P frame
    
[h264 @ 098e5c80] RTP: missed 4 packets
    
[h264 @ 0ac79960] error while decoding MB 35 38, bytestream (-41)
    
[h264 @ 0ac79960] Cannot use next picture in error concealment
    
[h264 @ 0ac79960] concealing 574 DC, 574 AC, 574 MV errors in P frame

    I dumped the RTSP stream to an avi file using ffmpeg and there are no errors.
    C :\Users\Matlab>ffmpeg -i rtsp ://192.168.1.67/gnz_media/main 123.avi

    There are no H.264 decoding errors. Can anybody help with above decoding errors using ffmpeg api.

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