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• Unknown OS 'msys_nt-6.1'. using Mingw on win7 64bit

  6 juillet 2018, par user63898

  I try to compile FFmpeg from source using MSYS2 and MIngW I’m using win7 64 bit .
  using .

  $ ./configure --enable-shared

  I’m getting this error :

  Unknown OS 'msys_nt-6.1'.
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solve the problem.

  looking in to config.log
  i see ( the end of the log ) :

  gcc -std=c99 -Wall -O3 -c -o /tmp/ffconf.fnJeLuIu.o /tmp/ffconf.e8DJYGJM.c
  
  check_code cc  int test[2*(sizeof(void *) > 4) - 1]
  
  check_cc
  
  BEGIN /tmp/ffconf.e8DJYGJM.c
  
      1   int main(void) { int test[2*(sizeof(void *) > 4) - 1]; return 0; }
  
  END /tmp/ffconf.e8DJYGJM.c
  
  gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -std=c99 -c -o /tmp/ffconf.fnJeLuIu.o /tmp/ffconf.e8DJYGJM.c
  
  G:/msys64/tmp/ffconf.e8DJYGJM.c: In function 'main':
  
  G:/msys64/tmp/ffconf.e8DJYGJM.c:1:22: error: size of array 'test' is negative
  
   int main(void) { int test[2*(sizeof(void *) > 4) - 1]; return 0; }
  
                        ^
  
  check_cpp_condition stddef.h defined(__x86_64__)
  
  check_cpp
  
  BEGIN /tmp/ffconf.e8DJYGJM.c
  
      1   #include 
  
      2   #if !(defined(__x86_64__))
  
      3   #error "unsatisfied condition: defined(__x86_64__)"
  
      4   #endif
  
  END /tmp/ffconf.e8DJYGJM.c
  
  gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -std=c99 -E -o /tmp/ffconf.fnJeLuIu.o /tmp/ffconf.e8DJYGJM.c
  
  G:/msys64/tmp/ffconf.e8DJYGJM.c:3:2: error: #error "unsatisfied condition: defined(__x86_64__)"
  
   #error "unsatisfied condition: defined(__x86_64__)"
  
    ^
  
  Unknown OS 'msys_nt-6.1'. 

  what did i miss ? what did i do wrong ?
  Thanks

• Unknown OS 'msys_nt-6.1'. using Mingw on win7 64bit

  9 janvier 2016, par user63898

  I try to compile FFmpeg from source using MSYS2 and MIngW I’m using win7 64 bit .
  using .

  $ ./configure --enable-shared

  I’m getting this error :

  Unknown OS 'msys_nt-6.1'.
  
  
  
  If you think configure made a mistake, make sure you are using the latest
  
  version from Git.  If the latest version fails, report the problem to the
  
  ffmpeg-user@ffmpeg.org mailing list or IRC #ffmpeg on irc.freenode.net.
  
  Include the log file "config.log" produced by configure as this will help
  
  solve the problem.

  looking in to config.log
  i see ( the end of the log ) :

  gcc -std=c99 -Wall -O3 -c -o /tmp/ffconf.fnJeLuIu.o /tmp/ffconf.e8DJYGJM.c
  
  check_code cc  int test[2*(sizeof(void *) > 4) - 1]
  
  check_cc
  
  BEGIN /tmp/ffconf.e8DJYGJM.c
  
      1   int main(void) { int test[2*(sizeof(void *) > 4) - 1]; return 0; }
  
  END /tmp/ffconf.e8DJYGJM.c
  
  gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -std=c99 -c -o /tmp/ffconf.fnJeLuIu.o /tmp/ffconf.e8DJYGJM.c
  
  G:/msys64/tmp/ffconf.e8DJYGJM.c: In function 'main':
  
  G:/msys64/tmp/ffconf.e8DJYGJM.c:1:22: error: size of array 'test' is negative
  
   int main(void) { int test[2*(sizeof(void *) > 4) - 1]; return 0; }
  
                        ^
  
  check_cpp_condition stddef.h defined(__x86_64__)
  
  check_cpp
  
  BEGIN /tmp/ffconf.e8DJYGJM.c
  
      1   #include 
  
      2   #if !(defined(__x86_64__))
  
      3   #error "unsatisfied condition: defined(__x86_64__)"
  
      4   #endif
  
  END /tmp/ffconf.e8DJYGJM.c
  
  gcc -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -std=c99 -E -o /tmp/ffconf.fnJeLuIu.o /tmp/ffconf.e8DJYGJM.c
  
  G:/msys64/tmp/ffconf.e8DJYGJM.c:3:2: error: #error "unsatisfied condition: defined(__x86_64__)"
  
   #error "unsatisfied condition: defined(__x86_64__)"
  
    ^
  
  Unknown OS 'msys_nt-6.1'. 

  what did i miss ? what did i do wrong ?
  Thanks

• Do I have to reduce the GOP size for zero-latency streaming ?

  10 juin 2017, par AndreKR

  I am piping frames into FFmpeg at quite a slow rate (1 per second) and I want to stream them out with very low latency.

  There are not only sources (for example here and here) that don’t mention that I need to set the GOP size (keyint) to a small value, but there are even sources (like here and here) that explicitly say that I don’t have to set the GOP size to a small value.

  However, so far the only way I found to reduce the really long start delay is to actually reduce the GOP size to 1.

  Anyway, here’s my current command line :

  ffmpeg -f image2pipe
  
         -probesize 32
  
         -i -
  
         -c:v libx264
  
         -preset veryfast
  
         -crf 23
  
         -vsync 2
  
         -movflags "frag_keyframe+empty_moov"
  
         -profile baseline
  
         -x264-params "intra-refresh=1"
  
         -tune zerolatency
  
         -f mp4
  
         -

  (I also tried adding :bframes=0:force-ctr:no-mbtree:sync-lookahead=0:sliced-threads:rc-lookahead=0 to -x264-params (what -tune zerolatency is supposed to do) because some of those values didn’t appear in the debug output, but as expected it had no effect.)

  As you can see here, we are already 182 frames (= 3 minutes wall clock) into the stream, but it still hasn’t emitted anything (size was 1kB from the start).

  frame=  182 fps=1.0 q=20.0 size=       1kB time=00:00:07.24 bitrate=   0.8kbits/s speed=0.0402x

  This actually talks about the time-to-first-picture, but it makes it seem like it’s not a big deal. ;) It is for me, so maybe I have to make the first GOP 1 frame long and then I can switch to longer GOPs ? Can FFmpeg do that ?