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• gsm parser : set duration

  13 janvier 2012, par Justin Ruggles

  gsm parser : set duration

• ffmpeg : combining/ordering vidstab and crop filters

  30 juillet 2016, par ljwobker

  I have a workflow which essentially takes a raw video file, crops away portions of the frame that aren’t relevant, then performs a two-pass deshake filter using the vidstab filter. At the moment I’m running this as three distinct commands : one to do the crop, a second to do the vidstab "detect" pass, and a third to do the vidstab "transform" pass.

  My working script :

  # do the crop first and strip the audio
  
  nice -20 ffmpeg -hide_banner -ss $SEEK -i $INFILE -t $DURATION -preset veryfast -crf 12 -vf crop=0.60*in_w:in_h/9*8:0.22*in_w:0 -an -y $TEMP
  
  
  
  # now run the vidstab detection pass
  
  nice -20 ffmpeg -hide_banner -i $TEMP -vf vidstabdetect=stepsize=6:shakiness=10:accuracy=15:result=${INFILE}.trf -f null - 
  
  
  
  # now the vidstab transform, with unsharp and writing the overlay text
  
  nice -20 ffmpeg -hide_banner -i $TEMP -preset veryfast -crf 22 -vf \
  
  " \
  
  vidstabtransform=input=${INFILE}.trf:zoom=2:smoothing=60, 
  
  unsharp=5:5:0.8:3:3:0.4, 
  
  drawtext=fontfile=/Windows/Fonts/arialbd.ttf:text=$DIVE:enable='between(t,0,65)':fontcolor=black:fontsize=72:x=w*0.01:y=h*0.01,  
  
  null"\
  
    -y $OUTFILE

  What I can’t seem to figure out is how I can combine the first two filter passes into a single chain, which (at least in theory) would be a faster encode time, and at the very least would be simpler to maintain and would eliminate a pass of the encoder. What I tried to do was the second code block, which just builds a filterchain that combines the initial crop with the vidstab detection filter.

  # this is a combined filter for the crop and the vidstab detect
  
  nice -20 ffmpeg -hide_banner -ss $SEEK -i $INFILE -t $DURATION -preset veryfast -crf 12 -vf \
  
  " \
  
  crop=0.60*in_w:in_h/9*8:0.22*in_w:0,
  
  vidstabdetect=stepsize=6:shakiness=10:accuracy=15:result=${INFILE}.trf,
  
  null " \
  
  -an -r 30 -y $TEMP
  
  
  
  
  
  # now run the transcoding and the vidstab transform
  
  nice -20 ffmpeg -hide_banner -i $TEMP -preset veryfast -crf 22 -vf \
  
  " \
  
  
  
  vidstabtransform=input=${INFILE}.trf:zoom=2:smoothing=60, 
  
  unsharp=5:5:0.8:3:3:0.4, 
  
  drawtext=fontfile=/Windows/Fonts/arialbd.ttf:text=$DIVE:enable='between(t,0,65)':fontcolor=black:fontsize=72:x=w*0.01:y=h*0.01,  
  
  
  
  null"\
  
    -y $OUTFILE

  However, when I run this (and it runs) the final output video has most definitely NOT been effectively stabilized. The logs show that both the detect and the transform passes have been processed, it’s just that the output isn’t right.

• Check for oom in the dirac parser.

  2 octobre 2014, par Carl Eugen Hoyos

  Check for oom in the dirac parser.
  Fixes ticket #3996.
  

  • [DH] libavcodec/dirac_parser.c