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• Capture & save MJPG CCTV stream to file w. FFMPEG

  21 juin 2021, par GBano

  I've been trying to record an IP-cam stream (Foscam, mjpg) via http with ffmpeg.
Can't get the rtsp stream for some reason, but the http/mjpg works fine (VLC IDed it as mjpg).

  


  The stream URL looks like this :
http://192.168.1.123:456/videostream.cgi?user=USERNAME&pwd=PWD

  


  So I created the string (w.o line wrap) :
ffmpeg -i -loglevel debug http://192.168.1.123:456/videostream.cgi?user=USERNAME&pwd=PWD /home/user/Videos/camera.mp4

  


  Some examples I saw are using -c copy and map 0 options as well but I left this out since I defined source and destination clearly and this is just a video, no audio.
segment_time and segment_format I also left out for now (I'd like segments later though- when it's working).

  


  FFMPEG returns : "bash: /home/user/Videos/camera.mp4: No such file or directory"

  


  So I tried a random mjpg stream from the net (Insecam is a nice source for this...) : http://58.69.178.54:80/mjpg/video.mjpg

  


  Leading to :
ffmpeg copy -i -loglevel debug -hide_banner http://58.69.178.54:80/mjpg/video.mjpg /home/user/Videos/camera.mp4

  


  Returns : -loglevel: "No such file or directory" (the same with segment options included, copy excluded).

  


  Shouldn't FFMPEG create the destination file ?

  


  One example mixed FFMPEG with CVLC (Save continuous RTSP stream to 5-10 minute long mp4 files) so I just tried with cvlc.
cvlc http://58.69.178.54:80/mjpg/video.mjpg copy /home/user/Videos/camera.mp4
This opens the stream in a VLC window (despite that I use Cvlc) but does not create a destination file.

  


  I suspect I must have missed something simple & silly, but what ?

  


• 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.

• 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