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• libFLAC/lpc_intrin_sse.c : New SSE code to calculate autocorrelation.

  9 août 2014, par Erik de Castro Lopo

  libFLAC/lpc_intrin_sse.c : New SSE code to calculate autocorrelation.
  Accelerate FLAC__lpc_compute_autocorrelation_intrin_sse_lag_NN routines for
  
  AMD and newer Intel CPUs (means Core i aka Nehalem and newer). Unfortunately
  
  it’s slower on older Intel CPUs.
  According to tests at HA :
      <http://www.hydrogenaud.io/forums/index.php?s=&showtopic=101082&view=findpost&p=870753> ;
    CPU                 flac -5           flac -8
    Athlon XP           +5 %              +2.4 %
  
    Athlon 64 X2        +9 %              +4 %
  
    Core i              +7 %              +1 % ... +2.7 %
  
    Core 2 ?                 -3.5 %
  According to Steam HW survey <http://store.steampowered.com/hwsurvey/> ;
  
  69% of Steam users have SSE4.2 which means that the new code is faster for
  
  them. There are also AMD users that don’t have SSE4.2, so 75% of Steam users
  
  should benefit from this patch.
  Patch-from : lvqcl <lvqcl.mail@gmail.com>
  

  • [DH] src/libFLAC/lpc_intrin_sse.c

• Anomalie #3622 : .raccourcis en colonne gauche

  21 décembre 2017, par chan kalan

  ceci dit, la règle overflow-wrap : break-word ; pourrait aussi convenir, peut-être mieux...

• Short HLS MPEG2 Video Segments Do Not Play

  24 août 2019, par Jon H

  I’ve been attempting to cut a video into small segments (words), to be rearranged. While I’ve been able to do it with FFMPEG, cutting into segments and using the fast concat demuxer to reassemble the segments, I am trying to speed it up.

  I have been doing this by splitting the original video into short MPEG2 .ts segments for each word :

  ffmpeg -ss 1 -to 1.5 -i "source.mp4" -c:v libx264 -b:v 1200k -c:a aac -b:a 192k -hls_flags single_file "word.ts"

  I have then tried making a m3u8 playlist of these short video segments, but I found that only segments around 2 seconds or more, play at all.

  I then tried using the ’cat’ command to join these segments into a single file, which I understand should be possible with MPEG2 streams. However, this did not play all the segments either.

  To test if all the segments were present in this concatenated file, I used FFMPEG to convert it back into an MP4 file, and all the segments were present.

  I would appreciate any suggestions on producing the segments, and concatenating individual segments simply without FFMEPG. My project isn’t viable if having to call FFMPEG each time, but would work great if I can simply concatenate words together.