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• configure : rework parsing —cpu arguments to support all features unless blacklisted

  17 septembre 2023, par James Almer

  configure : rework parsing —cpu arguments to support all features unless blacklisted
  Keeping an ever growing list of CPUs just to pass -march to the compiler and
  
  enable fast_cmov is a waste of time. Every CPU we know has limitations is
  
  already handled here, so just fallback to enabling everything when a passed in
  
  argument is not one of those.
  This will enable optimizations for CPU architectures released in the past 7 or
  
  so years with supported GCC and clang compilers when used as argument in
  
  configure, instead of silently ignoring them.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] configure

• avcodec/tiff : Don't cast const away

  7 septembre 2023, par Andreas Rheinhardt

  avcodec/tiff : Don't cast const away
  lzma_stream.next_in is const for more than 15 years now
  
  and has been so in every release of liblzma.
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/tiff.c

• FFmpeg : Trying to fade out first and later fade back in doesn't work [duplicate]

  6 septembre 2023, par Paul S

  While I just became a registered user on the site, I've been utilizing Stack Overflow for years, virtually always being able to find solutions to problems I've encountered. Unfortunately, not this time ; I have encountered a problem with the ffmpeg video fade filter. There are lots of previously proposed issues along with their solutions, but none (that I can find) that address a twist that I have.

  


  Most questions ask, "how do I fade in", or "how do I fade out", and "how do I fade in at the beginning and fade out at the end." If I want to fade in and later fade out, my below code works just fine.

  


  ffmpeg -ss 00.0 -accurate_seek -to 15.0 -i My.Test.File.mkv -c:v h264 -vf fade=t=in:st=0:d=2,fade=t=out:st=13:d=2 -b:v 825k -s 1280x720 -r 29.97 -c:a aac -ar 44100 -ac 2 -b:a 96k output.mp4


  


  However, I actually want to fade out somewhere in the middle, and then fade back in shortly after, and that doesn't seem to work. I structured the ffmpeg command as so :

  


  ffmpeg -ss 00.0 -accurate_seek -to 15.0 -i My.Test.File.mkv -c:v h264 -vf fade=t=out:st=6:d=2,fade=t=in:st=9:d=2 -b:v 825k -s 1280x720 -r 29.97 -c:a aac -ar 44100 -ac 2 -b:a 96k output.mp4


  


  This fails and yields a completely blank video. I've also tried some -filter_complex variations, but get similar results ; fading in and later fading out works, but fading out and later fading in does not.

  


  I'm using the latest ffmpeg windows version on Windows 10. I would have attached a sample video file but I'm seeing how to do that. It is not the original video file that started my issue, but it does duplicate the issue. Not sure what other info might help in coming up with a solution. Thoughts ?