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• x86 : Add asm for mbtree fixed point conversion

  4 mars 2016, par Henrik Gramner

  x86 : Add asm for mbtree fixed point conversion
  The QP offsets of each macroblock are stored as floats internally and
  
  converted to big-endian Q8.8 fixed point numbers when written to the 2-pass
  
  stats file, and converted back to floats when read from the stats file.
  Add SSSE3 and AVX2 implementations for conversions in both directions.
  About 8x faster than C on Haswell.
  

  • [DH] common/mc.c
  • [DH] common/mc.h
  • [DH] common/x86/mc-a2.asm
  • [DH] common/x86/mc-c.c
  • [DH] encoder/ratecontrol.c
  • [DH] tools/checkasm.c

• How to convert mkv movies to mp4 for streaming to XBox 360

  11 août 2015, par Rob Gwynn-Jones

  I recently purchased a Synology Diskstation DS412+, and I have a number of .mkv movies which I would like to convert/transcode to mp4 files, so that I can stream them directly to my XBox 360. I use Handbrake on my laptop, but I would rather have this happen directly on my NAS.

  I’m very rusty on Linux and new to transcoding, but the script I currently have is the following :

  #!/bin/bash
  
  for dir in *; do
  
    if test -d "$dir"; then
  
      #echo $dir
  
      for file in "$dir"/*.mkv; do
  
        noextension=${file%.*}.mp4
  
        ffmpeg -y -i "$file" -vcodec copy -acodec copy "$noextension"
  
      done
  
    fi
  
  done

  Which, as I understand it, simply copies the audio and video components within the mkv container, and inserts them into a new mp4 container. This has worked for several of my files, but there are a number for which this does not work.

  The following is an example of the output for a failed run :

  ffmpeg version UNKNOWN, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Sep 16 2013 00:45:02 with gcc 4.2.1
  
    configuration: --prefix=/usr/syno --arch=i686 --target-os=linux --cross-prefix=/usr/local/i686-linux-gnu/bin/i686-linux-gnu- --enable-cross-compile --enable-optimizations --disable-yasm --disable-altivec --enable-pic --enable-shared --disable-static --disable-swscale-alpha --disable-ffserver --disable-ffplay --enable-libmp3lame --enable-libfaac --enable-nonfree --enable-version3 --enable-libopencore-amrnb --enable-libopencore-amrwb --disable-decoder=amrnb --disable-indev=alsa --disable-outdev=alsa --disable-encoder=dca --disable-encoder=ac3 --disable-encoder=ac3_fixed --disable-encoder=ac3_float --disable-encoder=eac3 --disable-decoder=dca --disable-decoder=eac3 --disable-decoder=truehd --cc=/usr/local/i686-linux-gnu/bin/i686-linux-gnu-ccache-gcc
  
    libavutil    50. 40. 1 / 50. 40. 1
  
    libavcodec   52.120. 0 / 52.120. 0
  
    libavformat  52.108. 0 / 52.108. 0
  
    libavdevice  52.  4. 0 / 52.  4. 0
  
    libavfilter   1. 77. 0 /  1. 77. 0
  
    libswscale    0. 14. 0 /  0. 14. 0
  
  [matroska,webm @ 0x80726c0] Estimating duration from bitrate, this may be inaccurate
  
  
  
  Seems stream 1 codec frame rate differs from container frame rate: 47.95 (5994/125) -> 23.98 (24000/1001)

  ...and then a list of input chapter start and end times and then...

   Stream #0.0(eng): Audio: aac, 48000 Hz, stereo, s16 (default)
  
   Stream #0.1(eng): Video: h264 (High), yuv420p, 1280x692 [PAR 1:1 DAR 320:173], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)

  ...and then a list of output chapter start and end times and then...

  Stream #0.0(eng): Video: ![0][0][0] / 0x0021, yuv420p, 1280x692 [PAR 1:1 DAR 320:173], q=2-31, 2997 tbn, 23.98 tbc (default)
  
  Stream #0.1(eng): Audio: libfaac, 48000 Hz, stereo (default)
  
  Stream mapping:
  
    Stream #0.1 -> #0.0
  
    Stream #0.0 -> #0.1
  
  Press [q] to stop encoding
  
  [mp4 @ 0x808a020] pts < dts in stream 0
  
  av_interleaved_write_frame(): Invalid data found when processing input

  The XBox support website gives details on supported file types, with mp4 included in the H.264 standard : http://support.xbox.com/ar-SA/xbox-360/system/audio-video-playback

  I’m at a bit of a loss. I’ve read through http://www.ffmpeg.org/ffmpeg.html but the error message from ffmpeg doesn’t seem very helpful, and resources are sparse at best when it comes to running this stuff on a Synology Box.

  I have tried a few permutations of my script, such as :

  ffmpeg -i "$file" "$noextension"

  and

  ffmpeg -y -i "$file" -vcodec mpeg4 -acodec libfaac "$noextension"

  But those both give me the following error :

  Error while opening encoder for output stream #0.0 - maybe incorrect parameters such as bit_rate, rate, width or height

  I assume that I’ll need to specify input and output codecs specifically, along with things like bitrate, or aspect ratio but this is where I come unstuck.

  Any help would be much appreciated !

• Anomalie #3113 (Nouveau) : Absence de contrôle d’unicité du champ email dans le formulaire auteur

  6 décembre 2013, par - Equipement

  Bonjour,

  Le formulaire editer_auteurs ne contrôle pas l’unicité du champ email.

  Aussi, plusieurs auteurs peuvent avoir le même email dans SPIP.

  On peut ainsi créer en double un auteur qui existe depuis longtemps (avec un login différent car le formulaire editer_auteurs vérifie l’unicité du champ login).

  Par ailleurs, lorsque l’on utilise un système d’authentification centralisé (comme CAS ou LDAP) et que l’identifiant du SSO est l’email de l’auteur, cela pose un problème. En effet, si le SSO dit que dupond@test.fr s’est bien authentifié, mais qu’il y a 2 auteurs avec cet email dans SPIP, il est difficile de savoir lequel des 2 est censé être connecté dans SPIP.

  Il serait souhaitable de pouvoir disposer d’une constante (à placer dans le fichier mes_options.php) qui active un contrôle d’unicité du champ email dans le formulaire auteur. Ce caractère optionnel (de la constante) éviterait d’impacter ceux qui ont actuellement des doublons d’email dans la table des auteurs et qui souhaitent les garder.

  Cordialement
  Equipement