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• Save frame as image during video stream using ffmpeg, in C

  30 avril 2017, par George T.

  I’m using the Parrot SDK3 to retrieve the video stream from a Bebop2 drone. From it I need to "extract" a frame and save it as an image.

  The whole code can be found here, but I shall try to include the (what I understand as) important parts here.

  Where the video is sent to mplayer. I assume from this that the video format is h624.

  if (videoOut != NULL)
  
  {
  
      if (codec.type == ARCONTROLLER_STREAM_CODEC_TYPE_H264)
  
      {
  
          if (DISPLAY_WITH_MPLAYER)
  
          {
  
              fwrite(codec.parameters.h264parameters.spsBuffer, codec.parameters.h264parameters.spsSize, 1, videoOut);
  
              fwrite(codec.parameters.h264parameters.ppsBuffer, codec.parameters.h264parameters.ppsSize, 1, videoOut);
  
  
  
              fflush (videoOut);
  
          }
  
      }
  
  }

  Where the frame is received and written to videoOut, to be displayed

  eARCONTROLLER_ERROR didReceiveFrameCallback (ARCONTROLLER_Frame_t *frame, void *customData)
  
  {
  
      if (videoOut != NULL)
  
      {
  
          if (frame != NULL)
  
          {
  
              if (DISPLAY_WITH_MPLAYER)
  
              {
  
                  fwrite(frame->data, frame->used, 1, videoOut);
  
  
  
                  fflush (videoOut);
  
              }
  
          }
  
      }
  
      return ARCONTROLLER_OK;
  
  }

  The idea I had in mind is to fwrite(frame->data, frame->used, 1, videoOut); to a different file but that just creates a corrupted file, probably because of encoding. In what way can I get this frame and store it to a separate image ? The preferable image filetype .png, .jpg or .gif

  Any help will be greatly appreciated ! Thanks in advance !

• How to save stream with ffmpeg to chunks, But in temporary name and change the name after to const

  10 janvier, par Eliya

  I use ffmpeg to record IP camera and I save every 10 minutes to mp4 file.
This is my code :

  


  ffmpeg -rtsp_transport tcp -i "rtsp://$user_name:$password@$IP:$port/cam/realmonitor?channel=1&subtype=1" -c copy -map 0 -reset_timestamps 1  -f segment -segment_time 600 -strftime 1   "%Y-%m-%d__%H:%M:%S.mp4"


  


  Is there a way to save the file in temporary name until 10 minutes is done ?
I mean when the recording of 10 minutes didn't end the suffix will be bla.temp and when the recording of the 10 minutes is over, ffmpeg will change the suffix to .mp4 ?
is that possible ?

  


• How to save an audiostream with ffmpeg

  13 juillet 2020, par Nico Eymael

  I want to save an audiostream from beatport.com with ffmpeg.

  


  

  1. The audiostream is : https://www.beatport.com/track/maximal-happiness/13855065

  


  2. Outputfile : audiotrack1.aac

  


  3. I know that the music is streamed in aac format. I want my output file to be also aac. I've looked up in which format it is being streamed.

  


  


  So in cmd I write :

  


  ffmpeg -i https://www.beatport.com/track/maximal-happiness/13855065.aac -vn -c:a copy audiotrack1.aac

  


  My cmd answers me :

  


  https://www.beatport.com/track/maximal-happiness/13855065: Invalid data found when processing input