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• PNG sequence to MP4 while looping the animation

  19 April 2016, by 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}"

• FFmpeg av_guess_format returns NULL

  12 September 2014, by Kage

  I’m following the example code here: http://cekirdek.pardus.org.tr/ ismail/ffmpeg-docs/output-example_8c-source.html

  My code is as follows:

  fmt = av_guess_format(NULL, filename, NULL);
  
  if (!fmt) {
  
          LOGE(1,"Could not deduce output format from file extension: using MPEG.\n");
  
          fmt = av_guess_format("mp4", NULL, NULL);
  
  }
  
      if (!fmt) {
  
          LOGE(1, "Could not find suitable output format\n");
  
          exit(1);
  
  }

  The two times that I call av_guess_format, it is returning NULL both times.
  I am calling both av_register_all() and avcodec_register_all() beforehand.

  Any ideas as to why this is returning NULL?

  Thanks in advance.

• FFMPEG - ignoring invalid SAR: 0/0

  10 September 2015, by Sultanen

  Im using FFMPEG to merge multiple IP cameras streams into one MPEG stream. This works well for some cameras but i get this error message when i stream a DLink MJPEG stream:

  [mjpeg @ 0x7fd0f900b600] ignoring invalid SAR: 0/000:00.26 bitrate=2673.8kbits/s dup=1 drop=907    
  
      Last message repeated 12 times
  
  [mjpeg @ 0x7fd0f900b600] ignoring invalid SAR: 0/000:00.26 bitrate=2673.8kbits/s dup=1 drop=920    
  
      Last message repeated 13 times
  
  [mjpeg @ 0x7fd0f900b600] ignoring invalid SAR: 0/000:00.26 bitrate=2673.8kbits/s dup=1 drop=934    
  
      Last message repeated 12 times
  
  [mjpeg @ 0x7fd0f900b600] ignoring invalid SAR: 0/000:00.26 bitrate=2673.8kbits/s dup=1 drop=947 

  The ffmpeg command i use is:

  ffmpeg \
  
  -i http://admin:@IP1/video.cgi?resolution=640x480 \
  
  -i http://admin:@IP2/video.cgi?resolution=640x480 \
  
  -filter_complex "[0:v]scale=320:240,pad=640:480[a]; [1:v]scale=320:240[b];[a][b]overlay=320[out]" \
  
  -map [out] \
  
  -f mpeg1video \
  
  -r 30 http://outputURL \

  ffprobe gives me the following information about the stream

  [mjpeg @ 0x7fe20b80c000] Format mjpeg detected only with low score of 25, misdetection possible!
  
  [mjpeg @ 0x7fe20c000000] ignoring invalid SAR: 0/0
  
  Input #0, mjpeg, from 'http://admin:@IP1/video.cgi?resolution=640x480':
  
    Duration: N/A, bitrate: N/A
  
      Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 640x480, 25 tbr, 1200k tbn, 25 tbc

  What does this mean and how can i avoid it?