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• avcodec/ac3enc : fix undefined negative left shift

  9 octobre 2015, par Ganesh Ajjanagadde

  avcodec/ac3enc : fix undefined negative left shift
  This should fix the undefined behavior reported in :
  
  https://trac.ffmpeg.org/ticket/4727.
  I can reproduce this at runtime : simply stick in an abort call in
  
  asym_quant to check if c < 0 and run FATE. I don’t know ac3 so I can’t
  
  confirm if negative coefficients are intentional, but at the moment they
  
  clearly are according to FATE.
  This resolves the undefined behavior. Tested with FATE.
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavcodec/ac3enc.c

• ffmpeg : combine filter_complex trim, overlay and concat

  4 octobre 2015, par jb_alvarado

  I try to combine different video and audio clips with trimming and a logo on top.

  My syntax looks like this :

  ffmpeg -i "$introVid" -i "$introAud" -i "$mainVid" -i "$mainAud" -i "$outroVid" -i "$outroAud" -i "$logo" -i "$mainVid" -i "$mainAud" \
  
  -filter_complex \
  
  "[2:0]trim=0.4:60[trimV1]; \
  
   [3:0]atrim=0.4:60[trimA1]; \
  
   [trimV1][6:v]overlay=main_w-overlay_w-20:15,fade=in:s=2:d=0.5:alpha=1,fade=out:s=60:d=0.5:alpha=1[fade]; \
  
   [7:0]trim=60.2:72[trimV2]; [8:0]atrim=60.2:72[trimA2]; \
  
   [0:0] [1:0] [fade] [trimA1] [4:0] [5:0] [trimV2] [trimA2] concat=n=4:v=1:a=1[cv][a]; \
  
   [cv]scale=864:480:flags=gauss:interl=0[scal]" \
  
  -map "[scal]" -map "[a]" -pix_fmt yuv420p -c:v libx264 -preset fast -y "$out"

  It works mostly, but the problem is that I get a black video, with the same length then the main video, on the 3rd place. Interesting is also, when I watch the ffmpeg process, it hangs shortly on time 1:26min and then it jumps to 2:40min. Normally the complete test video have around 1:30min.

  The output what I get is at the moment :

  ([intro][trimmed main with logo][black video][outro][credits]) <- the black video part is to much.

• ffplay : add support for interactive volume control

  27 septembre 2015, par Ganesh Ajjanagadde

  ffplay : add support for interactive volume control
  This is a feature heavily inspired by the mpv player. At the moment, methods
  
  for adjusting volume in ffplay are rather clumsy : either one needs to set it
  
  system-wide, or one needs to set it via the volume filter.
  This patch adds key bindings identical to the mpv defaults for muting/unmuting
  
  and increasing/decreasing the volume interactively without any introduction of
  
  external dependencies.
  TODO : doc update, possible mouse button bindings (mpv has this).
  Signed-off-by : Ganesh Ajjanagadde <gajjanagadde@gmail.com>
  
  Signed-off-by : Marton Balint <cus@passwd.hu>
  

  • [DH] ffplay.c