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• PNG sequence to MP4 while looping the animation

  19 avril 2016, par user245115

  So, I’m trying to convert a PNG sequence to an MP4 and loop the animation about 100 times, the only problem is my script doesn’t seem to be working properly.

  What the script is supposed to do is get the number of PNG files in the frames directory, and send them to FFMPEG 100 times. Only problem is my script isn’t working right. Here’s the code.

  #!/bin/bash
  
  
  
  loopcode()
  
  {
  
  tmpdir=frames
  
  picext=png
  
  one=$(ls -l ${tmpdir}/*.png  | wc -l)
  
  two=$(echo "${one}+0" | bc -l)
  
  three=0
  
  while [ ! ${loopi} -eq ${looper} ]; do
  
    while [ ! ${three} -eq ${two} ]; do
  
      three=$(printf "%09d" ${two})
  
      echo ${tmpdir}/${three}.${picext}
  
      two=$(echo "${two}+1" | bc -l)
  
    done
  
    two=0
  
    loopi=$(echo "${loopi}+1" | bc -l)
  
  done
  
  }
  
  
  
  looper=100
  
  loopi=0
  
  outfile=output.mp4
  
  fps=5
  
  convert frames/*.png frames/%09d.jpeg
  
  loopcode && sleep 5
  
  cat $(loopcode) | ffmpeg -framerate 1/5 -i - -c:v libx264 -r 30 -pix_fmt yuv420p "${outfile}"

• Batch Programming Looping ?

  13 mai 2013, par Michael Barth

  I'm not an expert in batch programming, my only skill is in C\C++. I'm not even sure how to go about this really.

  I've got a bunch of videos like Video1.mp4, Video2.mp4 (that's not their actual names, but they do have numbers indicating beginning and end)

  Basically I have this FFMPEG command that I can use to convert all of these to an aspect ratio of 16:10 that looks something like this :

  "ffmpeg -i "Section 1 Video 1.mp4" -aspect 16:10 OutSection 1 Video 1.mp4"
  
  "ffmpeg -i "Section 1 Video 2.mp4" -aspect 16:10 OutSection 1 Video 2.mp4"
  
  "ffmpeg -i "Section 2 Video 1.mp4" -aspect 16:10 OutSection 2 Video 1.mp4"

  Now instead of writing this command over and over again, is there anyway for me to substitute the numbers for actual variables ? I know that Section 1 ends at Video 27 and Section 2 ends at Video 26 and so on. Basically I need the loop to run 165 times so I don't need to write the command 165 times.

  Or is this beyond the scope of capability of a mere batch program ?

• avcodec/webp : Switch to ff_vlc_init_from_lengths()

  18 avril, par Andreas Rheinhardt

  avcodec/webp : Switch to ff_vlc_init_from_lengths()
  The earlier code would traverse over the code lengths
  
  mutliple times (namely max_length + 1 times - once to get
  
  the maximum length and once for each max_length to assign
  
  codes) before calling ff_vlc_init_sparse() (which may traverse
  
  them twice and sort them). The new code only traverses them once
  
  (+ the one time in ff_vlc_init_from_lengths()).
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/webp.c