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• Improve bash script for checking when ffmpeg hangs streaming IP cam rtsp to youtube

  15 octobre 2022, par shakespeare

  Background

  



  I have a garden IP cam id like to stream live to youtube, so i decided to use ffmpeg to achieve this.

  



  The problem

  



  Whenever my IP cam restarts or loses connection ; ffmpeg will get stuck on the same frame and not resume once the IP cam is back online.

  



  My solution

  



  I have the ffmpeg output logged to a file, then have a script fetch the last line of the log every few seconds and compares frame numbers. If the frame numbers match, it kills ffmpeg process and starts another ffmpeg process.

  



  My question

  



  Is there a better way more efficient way ?

  



  logchecker.sh

  



  #/bin/bash
while true
do
    frameA=$(tail /home/daniel/output.txt -n 1 | sed -nr 's/.*frame=(.*)fps.*/\1/p')
    echo "$frameA"
    sleep 3
    frameB=$(tail /home/daniel/output.txt -n 1 | sed -nr 's/.*frame=(.*)fps.*/\1/p')
    echo "$frameB"

    if [ "$frameA" = "$frameB" ]
    then
        echo "Camera has hung"
        pkill ffmpeg
        echo "killed ffmpeg..."
        echo "Waiting 30 secs"
        sleep 30
        bash /home/daniel/ffmpeg.sh &
        echo "started ffpmeg.."
        echo "Waiting 30 secs"
        sleep 30
    else 
        echo "proceed"
    fi

    sleep 2
done


  



  ffmpeg.sh

  



  #!bin/bash
sleep 30
ffmpeg -f lavfi -i anullsrc -rtsp_transport udp -i rtsp://user:password@url:5544/live0.264 -bufsize 5000k -c:v copy -c:a mp3 -b:a 1 -f flv rtmp://a.rtmp.youtube.com/live2/xxxx-xxxx-xxxx-xxxx 2> /home/daniel/output.txt


  


• ffmpeg won't save the file when executed from a php page

  6 septembre 2015, par Tayax

  I wrote few lines of codes today to create an video from an image with ffmpeg.

  the command works well directly on my server and the file is saved at the good place, but when running it from PHP, the process goes, but the file won’t save for some reason.

  Here is the code I use :

  $ffmpegcmd= "/usr/bin/ffmpeg -loop 1 -y -i /home/mysite/www/forwork/simpletext.jpg -c:v libx264 -t 30 -pix_fmt yuv420p /home/mysite/www/forwork/movie.avi 2>&1";
  
  exec($ffmpegcmd, $output);  
  
  print_r($output);

  And here is the answer I get :

  Array ( [0] => ffmpeg version git-2015-09-06-db18b3d Copyright (c) 2000-2015 the FFmpeg developers 
  
  [1] => built with gcc 4.4.7 (GCC) 20120313 (Red Hat 4.4.7-16) 
  
  [2] => configuration: --prefix=/usr/ffmpeg_build --extra-cflags=-I/usr/ffmpeg_build/include --extra-ldflags=-L/usr/ffmpeg_build/lib --bindir=/usr/bin --pkg-config-flags=--static --enable-gpl --enable-nonfree --enable-libfdk-aac --enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 
  
  [3] => libavutil 55. 0.100 / 55. 0.100 
  
  [4] => libavcodec 57. 0.100 / 57. 0.100 
  
  [5] => libavformat 57. 0.100 / 57. 0.100 
  
  [6] => libavdevice 57. 0.100 / 57. 0.100 
  
  [7] => libavfilter 6. 0.100 / 6. 0.100 
  
  [8] => libswscale 4. 0.100 / 4. 0.100 
  
  [9] => libswresample 2. 0.100 / 2. 0.100 
  
  [10] => libpostproc 54. 0.100 / 54. 0.100 
  
  [11] => Input #0, image2, from '/home/mysite/www/forwork/simpletext.jpg': 
  
  [12] => Duration: 00:00:00.04, start: 0.000000, bitrate: 10414 kb/s 
  
  [13] => Stream #0:0: Video: mjpeg, yuvj420p(pc, bt470bg/unknown/unknown), 1280x720 [SAR 1:1 DAR 16:9], 25 fps, 25 tbr, 25 tbn, 25 tbc 
  
  [14] => /home/mysite/www/forwork/movie.avi: Permission denied )

  I chmod the forwork directory to 755 but it won’t change anything.

  help troubleshooting this would be greatly appreciate. Thanks

• Extract Video Meta Data from First Few MB on S3

  22 août 2016, par David Williams

  I have a large collection of video files on S3. I also have application servers running in AWS running a Java webapp. From those application servers, I would like to be able to extract metadata from each video file such as is provided by the Quicktime movie inspector :

  Source: /home/me/foo.mov
  
  Format: H.264, 1920x1080
  
  FPS: 29.97
  
  Data Size: 16.8 MB
  
  Data Rate: 6.70 Mbit/s

  Now, I can clearly get this information from ffmpeg :

  $ ffmpeg -i /home/me/foo.mov
  
  
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/home/me/foo.mov':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 1
  
      compatible_brands: isomavc1mp42
  
      creation_time   : 2014-06-30 22:40:08
  
    Duration: 00:00:20.02, start: 0.000000, bitrate: 6698 kb/s
  
      Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 6696 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
      Metadata:
  
        creation_time   : 2014-06-30 22:39:09
  
        handler_name    : GPAC ISO Video Handler

  I could easily parse out the equivalent fields to the Quicktime output ! But, this would require I have the file locally. Is it possible to do this from the first few MB (or some other mechanism) of a file hosted on S3 without downloading the whole thing locally ? The goal here is to extract the same fields as the quicktime inspector from a file on S3. Any ideas ?