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• Building x264 with YASM : failing the ASM check

  11 janvier 2020, par radiofreemyourenji

  My question up front is, "I have new yasm, I think x264 is supposed to be cool with that, why is x264 not cool with that ?"

  For reasons, I am building a CentOS docker image (based on centos:latest) that contains a from-scratch ffmpeg build, following the guide here. It’s a good guide, it’s worked for me before, so I was feeling good about it.

  Today I’m hitting a choke point on the libx264 build point : specifically, I say

  PKG_CONFIG_PATH="/tmp/ffmpeg_build/lib/pkgconfig" \
  
    ./configure \
  
    --prefix="/tmp/ffmpeg_build" \
  
    --bindir="/tmp/bin" \
  
    --enable-static

  And I get a reply back

  Found no assembler

  Minimum version is nasm-2.13

  If you really want to compile without asm, configure with —disable-asm.

  That’s unexpected. I have yasm, which I understand to be 1) there to do the things nasm does but better, and 2) to be the daisy-fresh most modern version given that I pulled it from its repo about an hour ago, and built it about fifty-nine minutes ago. For what it’s worth, nasm is on the box too since the instructions request it, but it’s below their stated version (i.e. it’s "NASM version 2.10.07 compiled on Jun 9 2014")

  So it seems like yasm is not being found. There’s another StackExchange question that mentions that problem, which came out to a pathing issue. So, I added yasm to my path like so :

  PATH=/tmp/ffmpeg_sources/yasm:$PATH \
  
    PKG_CONFIG_PATH="/tmp/ffmpeg_build/lib/pkgconfig" \
  
    ./configure
  
    ...etc

  That still gave the Found-no-assembler problem. As a last, confused resort, I told the script explicitly what I wanted to use for the variable $AS, because based on my quick look into configure, that looked like where yasm/nasm was meant to go. The command becomes :

  AS=`which yasm`
  
    PKG_CONFIG_PATH="/tmp/ffmpeg_build/lib/pkgconfig" \
  
    ./configure
  
    ...etc

  That at least gave

  Found yasm 1.3.0

  Minimum version is nasm-2.13

  If you really want to compile without asm, configure with —disable-asm.

  Looking in the config.log I see the following :

  checking whether /tmp/bin/yasm supports vmovdqa32 [eax]{k1}{z}, zmm0... no
  
  Failed commandline was:
  
  --------------------------------------------------
  
  /tmp/bin/yasm conftest.asm  -I. -I$(SRCPATH) -DARCH_X86_64=1 -I$(SRCPATH)/common/x86/ -f elf64  -o conftest.o
  
  conftest.asm:1: error: instruction expected after label
  
  conftest.asm:1: warning: ignoring unrecognized character `{'
  
  conftest.asm:1: warning: ignoring unrecognized character `}'
  
  conftest.asm:1: warning: ignoring unrecognized character `{'
  
  conftest.asm:1: warning: ignoring unrecognized character `}'
  
  --------------------------------------------------
  
  Failed program was:
  
  --------------------------------------------------
  
  vmovdqa32 [eax]{k1}{z}, zmm0
  
  --------------------------------------------------

  So : what’s the deal here ? Is my assumption that yasm drop-in replaces nasm bad ? Is yasm good for this purpose, but I’m not providing the right information to ./configure ? Are my instructions for building ffmpeg for CentOS simply out of date with respect to this prerequisite and I should just try harder to get a modern nasm ?

• Anomalie #2732 : interclassement table spip_urls

  8 juin 2012, par denisb -

  de fait (pfff) le problème provient d’une double définition de CHARACTER SET à la création de la table : celui, par défaut, des globales charset_sql_base et charset_collation_sql_base plus celui arrivant par le dump. mysql couine et ne crée pas la table (on voit ça dans les logs : url varchar(255) (...)

• German umlauts in ffmpeg drawtext filter

  15 août 2020, par Gert Gottschalk

  I need help getting german umlauts 'äüö' displayed properly/(at all) in ffmpeg drawtext filter. I can't say at this time if my inability comes from lack of ffmpeg know-how or machine configuration or both. Your input is much appreciated.

  



  In ffmpeg cmd line I have :

  



  /home/tools/bin/ffmpeg -loop 1 -i RAW2TIF_01_png_1080/IMG_1119.png -c:v libx264 -vf drawtext="fontsize=60:fontcolor=yellow:fontfile=/usr/share/fonts/truetype/freefont/FreeSans.ttf:textfile=./Scripts/header_text.txt:x=(w-text_w)/2:y=(h-text_h-line_h)/2" -t 10 -pix_fmt yuv420p  -crf 16 -r 24 -y ./Video/header_txt.mp4


  



  Note the 'drawtext' call.

  



  My linux machine where I run ffmpeg is setup for US keyboard and characters. So my first roadblock is to get the umlauts into the text in some editor. I tried typing 'alt-numerical' sequences, but the special characters will not show in vi, vim, emacs.

  



  If I were to have the special characters in a textfile I would not know if/how ffmpeg is able to handle them.

  



  A search on popular engine for 'ffmpeg drawtext umlaut' does not return any (for me) meaningful returns.

  



  Thanks,
Gert