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Autres articles (11)

  • Selection of projects using MediaSPIP

    2 mai 2011, par

    The examples below are representative elements of MediaSPIP specific uses for specific projects.
    MediaSPIP farm @ Infini
    The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...)

  • Les formats acceptés

    28 janvier 2010, par

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

  • 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 (...)

Sur d’autres sites (5285)

  • ffmpeg 2nd pass segfault [migrated]

    25 février 2014, par Mike Flynn

    I'm trying to get an old transcoding server up and running in a new environment and I'm experiencing some issues getting the well tested ffmpeg commands to work in the new environment.

    It's a 2 pass encoding strategy, and the first pass runs just fine every time, the 2nd pass consistently fails with the following :

    [libx264 @ 0x3925fc0] 2nd pass has more frames than 1st pass (1478)
    
[libx264 @ 0x3925fc0] continuing anyway, at constant QP=14
    
[libx264 @ 0x3925fc0] disabling adaptive B-frames
    
[libx264 @ 0x3925fc0] specified frame type is not compatible with max B-frames
    
Segmentation fault

    Here is the command we're using for each pass :

    Pass 1 :

    ffmpeg -y -i input.mp4 -pass 1 -b 774000 -ab 128000 -s 640x360 -passlogfile ffmpeglog -vcodec libx264 -g 90 -bf 3 -refs 1 -b_strategy 1 -coder 1 -qmin 10 -qmax 51 -sc_threshold 40 -flags +loop -cmp chroma -me_range 16 -me_method dia -subq 2 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 -direct-pred 3 -trellis 0 -partitions -parti8x8-parti4x4-partp8x8-partb8x8 -r 30 -keyint_min 25 -wpredp 2 -rc_lookahead 50 -acodec libfaac -ar 44100 pass1.mp4

    Pass 2 :

    ffmpeg -y -i pass1.mp4 -pass 2 -b 774000 -ab 128000 -s 640x360 -passlogfile ffmpeglog -vcodec libx264 -g 90 -bf 3 -refs 8 -b_strategy 1 -coder 1 -qmin 10 -qmax 51 -sc_threshold 40 -flags +loop -cmp chroma -me_range 16 -me_method umh -subq 9 -i_qfactor 0.71 -qcomp 0.6 -qdiff 4 -direct-pred 3 -trellis 2 -partitions +parti8x8+parti4x4+partp8x8+partp4x4+partb8x8 -r 30 -keyint_min 25 -wpredp 2 -rc_lookahead 60 -acodec libfaac -ar 44100 pass2.mp4

    ...and here is my ffmpeg configuration :

    ffmpeg version 2.1.4 Copyright (c) 2000-2014 the FFmpeg developers
    
  built on Feb 25 2014 19:23:21 with gcc 4.6.3 (GCC) 20120306 (Red Hat 4.6.3-2)
    
  configuration: --enable-gpl --enable-libmp3lame --enable-libtheora --enable-libvo-aacenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-version3 --enable-libfaac --enable-nonfree
    
  libavutil      52. 48.101 / 52. 48.101
    
  libavcodec     55. 39.101 / 55. 39.101
    
  libavformat    55. 19.104 / 55. 19.104
    
  libavdevice    55.  5.100 / 55.  5.100
    
  libavfilter     3. 90.100 /  3. 90.100
    
  libswscale      2.  5.101 /  2.  5.101
    
  libswresample   0. 17.104 /  0. 17.104
    
  libpostproc    52.  3.100 / 52.  3.100
    
Hyper fast Audio and Video encoder
    
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

    Any ideas would be greatly appreciated !

  • FFMPEG bluray compliant 1080p encoding

    26 septembre 2022, par Ben Gnomino

    I'm trying to encode (with ffmpeg) bluray compliant h264 files to use with adobe encore cs6.
Encore reads the m2ts file correctly and says no transcoding needed, but when I try to build the bdmv folder I get "video buffer underflows. total bitrate is too high near time..."

    


    "%execpath%" -hide_banner -c:v h264_cuvid -hwaccel_output_format cuda -i "%~1" -c:v h264_nvenc -preset medium -profile:v high -level:v 4.1 -b:v 25M -maxrate:v 38M -bufsize:v 30M -bf 3 -bt 1.0 -rc vbr -qmin 0 -qmax 69 -refs:v 4 -rc-lookahead 24 -flags +pass2+cgop -coder:v cabac -g 24 -keyint_min 1 -r 24000/1001 -bluray-compat 1 "%~p1%~n1.m2ts"


    


    Using libx264 makes no difference.
Instead same settings using x264.exe generates a perfectly working file (for encore).

    


  • FFMPEG bluray compliant 1080p encoding

    26 septembre 2022, par Ben Gnomino

    I'm trying to encode (with ffmpeg) bluray compliant h264 files to use with adobe encore cs6.
Encore reads the m2ts file correctly and says no transcoding needed, but when I try to build the bdmv folder I get "video buffer underflows. total bitrate is too high near time..."

    


    "%execpath%" -hide_banner -c:v h264_cuvid -hwaccel_output_format cuda -i "%~1" -c:v h264_nvenc -preset medium -profile:v high -level:v 4.1 -b:v 25M -maxrate:v 38M -bufsize:v 30M -bf 3 -bt 1.0 -rc vbr -qmin 0 -qmax 69 -refs:v 4 -rc-lookahead 24 -flags +pass2+cgop -coder:v cabac -g 24 -keyint_min 1 -r 24000/1001 -bluray-compat 1 "%~p1%~n1.m2ts"


    


    Using libx264 makes no difference.
Instead same settings using x264.exe generates a perfectly working file (for encore).

    


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