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• avcodec/jpeg2000dwt : Replace /2 by >>1

  23 juin 2015, par Michael Niedermayer

  avcodec/jpeg2000dwt : Replace /2 by >>1
  Divisions can be slow if the compiler fails to replace them by shifts
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavcodec/jpeg2000dwt.c

• FFmpeg concat images and audio what can't control framerate

  27 septembre 2016, par kensonLiang

  Good day !
  I want to concat images and audios to a video.and I found the command like that :

  ffmpeg -ss 00:00:00 -t 00:00:10 -i a.mp3 -ss 00:01:01 -t 00:00:10 -i b.mp3 -thread_queue_size 1024 -r 3 -i C:\f1\im\%08d.jpg -filter_complex "[0:a] [1:a] concat=v=0:a=1 [outa];movie=im/%08d.jpg,fps=3 [img]" -map [outa] -map [img] output.mp4

  It’s work.but whatever I set the fps and -r,the video stream will complete in 1second,and the audio will playing with the last frame of the video after the first second.
  help me,please !

• Crontab starts again before the process of conversion in ffmpeg ends (depending on time suppose /2 minutes) How to Control that ?

  4 février 2018, par A Sahra

  I am running a bash .sh file every two minutes with crontab. the problem is that when crontab runs bash file the process of ffmpeg video conversion starts,the conversion time varies depending on length of videos, i have set the crontab to run every two minutes. crontab runs again after two minutes before end of ffmpeg conversion.

  How to Figure out :

  control of crontab and conversion process so the crontab doesn’t starts again until process of conversion is not completed.

  #!/bin/bash
  
  # set PATH to check existance of video file in this directory
  
  checkfiles=/home/webuser/public_html/shareportal/convert_Up_videos/*
  
  checkforfiles=/home/webuser/public_html/shareportal/convert_Up_videos
  
  movetodire=/home/webuser/public_html/shareportal/uploaded_videos/
  
  conversionprocessdir=/home/webuser/public_html/shareportal/conversion_process/
  
  movetoArchive=/home/webuser/public_html/shareportal/Video_Archive/
  
  blockpath=/home/webuser/public_html/shareportal/block.txt
  
  processid=/home/webuser/public_html/shareportal/processid.txt
  
  #format of output video file
  
  webm='webm'
  
  if [ "$(ls -A $checkforfiles)" ]
  
  then 
  
  #check directory for files to convert
  
  for f in $checkfiles
  
      do  
  
          fullfilename="$f"
  
          filename=$(basename "$f")
  
          filewithoutextforimage="${filename%.*}"
  
          nametofile=$filewithoutextforimage | cut -c1-10;
  
          echo $filewithoutextforimage | cut -c1-10 1> $blockpath 2>&1
  
      filewithoutext="${f%.*}"
  
      fileextention="${f##*.}"
  
      image_path='/home/webuser/public_html/shareportal/video_images/'$filewithoutextforimage'.png'
  
      outputfilename=$conversionprocessdir"$filewithoutextforimage.webm"
  
      #ffmpeg conversion process starts here
  
      if (ffmpeg -i "$f" "$outputfilename" 1>> $blockpath 2>&1) 
  
      then 
  
          #Extract Image of video file on provided time stamp
  
          if (ffmpeg -ss 00:00:06 -i "$f" -vframes:v 1 "$image_path") 
  
          then
  
              echo "Image Extracted"
  
          else
  
              echo "Could not Extract Image"
  
          fi
  
          echo "Video Converted";
  
      else
  
          echo "Could Not Convert Video"
  
      fi
  
      #conversion Ends!!
  
      mv "$outputfilename" $movetodire
  
      mv "$fullfilename" $movetoArchive
  
  done
  
  else
  
  echo "File Not Found Directory is empty!!!-----"
  
  fi