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• FFMPEG and PHP on mac does`t work

  8 août 2014, par Thomás Marques

  I need your help. Currently I use Mac OS X 10.9.4 and xampp apache 1.8.3-3. I need to use ffmpeg (version 3.2) to convert video files via php exec() but I cannot make it work. I did some testing running the terminal command line and the system operates normally. Only in php it doesn’t work.
  ffmpeg was compiled and installed through the brew.

  I ran the following test :

  exec("/usr/local/Cellar/ffmpeg/2.3/bin/ffmpeg -i /Applications/XAMPP/xamppfiles/htdocs/teste/trailer.mp4 /Applications/XAMPP/xamppfiles/htdocs/teste/trailer2.flv 2>&1", $o, $v);
  
  var_dump($o);
  
  var_dump($v);

  and got the following :

  array(4) { 
  
      [0]=> string(51) "dyld: Symbol not found: __cg_jpeg_resync_to_restart" 
  
      [1]=> string(82) "Referenced from: /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO" 
  
      [2]=> string(63) "Expected in: /Applications/XAMPP/xamppfiles/lib/libJPEG.dylib" 
  
      [3]=> string(67) " in /System/Library/Frameworks/ImageIO.framework/Versions/A/ImageIO" } int(133)

• Save MJPEG video stream to a raw file

  6 septembre 2014, par user824963

  I’ve a cheap IP cam, and i need to save the video stream inside a single file.

  i’ve tried to execute the wget command towards the stream’ url and the result was a file with this syntax :

  --object-ipcamera
  
  Content-Type:image/jpeg
  
  Content-Length:8012
  
  
  
  ÿØÿà [JPEG IMAGE CHARACTERS]  ÿÙ
  
  --object-ipcamera
  
  Content-Type:image/jpeg
  
  Content-Length:8012
  
  
  
  ÿØÿàÆÿ [JPEG IMAGE CHARACTERS]  ÿÿÿÙ
  
  --object-ipcamera
  
  Content-Type:image/jpeg
  
  Content-Length:8036

  Since i need to store the video stream, is mp4 a proper format to do that ? What if mp4 file being truncated ?

  I tried with ffmpeg :

  ffmpeg -i http://<auth params="params" local="local" url="url">:99/vieostream.cgi out.mp4
  
  </auth>

  the output was

  [ingenient @ 0x1f51600] Could not find codec parameters for stream 0 (Video: mjpeg): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  [ingenient @ 0x1f51600] Estimating duration from bitrate, this may be inaccurate
  
  http://aaa@192.168.0.104:99/vieostream.cgi: could not find codec parameters

  and even setting these parameter to the max allowed value there is still the some output.

  I want also say that if i open the video url using VLC GUI, the video stream immediately comes out, so there is a way to auto-detect the video parameters ?

  Note : my server has a small CPU

• How to save (record) rtsp stream to the disk storage without artifacts and missing seconds ?

  20 septembre 2019, par Bogdan Rudnytskyi

  I need to save (record) rtsp stream to the disk storage.
  I am using nginx-module and ffmpeg for it.
  Here the config for enable recording :

  rtmp {
  
      live on;
  
      hls on;
  
      hls_fragment 5s;
  
      server {
  
          listen 1935;
  
          application cam1 {
  
              hls_path /tmp/cam1;
  
          }
  
          exec_static ffmpeg -rtsp_transport tcp -i rtsp://... -c copy -f flv rtmp://.../cam1/stream;
  
      }
  
  }

  Config is creating the flv files, each duration of 5 second.
  Then we need to merge all got files in one file by command :

  ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.flv

  After concated files we are got a problem. When previous 5 seconds end and start next 5 seconds we have artifacts and missing 0.5-1 second.

  Please, get me help with saving rtsp stream without artifacts and missing seconds.